06/19/2022 Forecast Update

FORECAST SUMMARY: Sunday June 19th, 2022, through Monday June 20th, 2022

OZONE: Ozone concentrations are expected to range from Moderate to USG.

PM-2.5: PM-2.5 concentrations are expected to range from Good to Moderate.

…AIR QUALITY ACTION DAY ADVISORY FOR MONDAY JUNE 20TH AND TUESDAY JUNE 21ST FOR THE FOLLOWIG COUNTIES…

IN WEST MICHIGAN:

ALLEGAN…BERRIEN…CASS… KENT… MASON…MUSKEGON…OCEANA…OTTAWA… VAN BUREN COUNTIES

FORECAST DISCUSSION:

USG-level Ozone is expected in the counties listed above, so this warrants an Air Quality Action Day for much of West Michigan for Monday and Tuesday this week.

Today, Sunday, continues the trend we’ve seen the past few days of ample sunshine and light winds. Surface temperatures will range from the mid-70s F to the low-80s F throughout the region. Surface temperatures increase as we go through tomorrow morning with high surface temperatures ranging from the upper-70s F to mid-80s F. Along with an increase in surface temperatures, winds shift to southwesterly flow tomorrow morning and stays that way through Tuesday. These winds, along with a warm front, will bring warmer temperatures Tuesday with highs reaching the mid-90s F.

In terms of air quality, as stated above, West Michigan counites are expected to reach USG-level Ozone concentrations for Monday and Tuesday. Surface winds coming from the southwest, mostly clear skies, surface temperatures in the upper-80s F to mid-90s F, and upper-level temperatures hovering around the low-20s C are all reasons behind the forecasted Ozone development. I will be looking over the forecast tomorrow for southeast Michigan for Tuesday as tomorrow will have possible rain and intermittent cloudiness to curb Ozone in southeast Michigan. Tuesday for southeast Michigan looks to clear out, so I will be looking to see if Ozone will develop, if so, then this current Action Day will extend to southeast Michigan for Tuesday.

PM-2.5 looks to remain in the Good to Moderate category through Tuesday.

EXTENDED FORECAST:

We will be looking over models and the forecast tomorrow to see if any changes are needed for Tuesday.

Forecast updated by: Alec Kownacki, Sunday June 19th, 2022. Next Forecast update: Monday June 20th, 2022

06/15/2022 Forecast Update

FORECAST SUMMARY: Wednesday June 15th, 2022, through Friday June 17th, 2022

OZONE:  Ozone concentrations are expected to reach USG-level today but will be Good to Moderate for the remainder of the week.

PM-2.5: PM-2.5 concentrations are expected to range from Good to Moderate throughout this week.

…AIR QUALITY ACTION DAY ADVISORY FOR WEDNESDAY JUNE 15TH FOR THE FOLLOWING COUNTIES…

IN WEST MICHIGAN:

ALLEGAN…BERRIEN…CASS… KENT… MASON…MUSKEGON…OCEANA…OTTAWA… VAN BUREN COUNTIES

 FORECAST DISCUSSION:

Today, Wednesday, is an Air Quality Action Day for the counties listed above for USG-level Ozone. High surface and upper-level temperatures, SW winds, and ample sunlight are expected to create a conducive environment for Ozone development. There is some relief to our west as a cold front and associated storm system approaches the Great Lakes region. The cold front is expected to pass through overnight into tomorrow morning bringing potential storms across the western and central Upper Peninsula later this afternoon into the evening. This will help to clean out the airmass as Ozone concentrations are expected to be in the Good to Moderate range for the remainder of the week.

Winds also shift to more westerly tomorrow for the Lower Peninsula and remain southwesterly for the Upper Peninsula. Temperatures are expected to remain in the 80s F tomorrow for much of Michigan, but as stated above, should not create a conducive environment for rapid Ozone development. Throughout the day on Friday, winds slowly shift to northwesterly with temperatures ranging from the upper-60s F to mid-70s F.

PM-2.5 concentrations are expected to remain in the Good to Moderate range. There appears to be a smoke plume over the Great Lakes region today and into tomorrow. However, this quickly exits the area come Friday.

EXTENDED FORECAST:

This weekend looks to be pleasant thanks to a High-pressure system drifting in from the north. This forecast will be updated on Friday as there appears to be another warmup early next week.

Forecast updated by: Alec Kownacki, Wednesday June 15th, 2022. Next Forecast update: Friday June 17th, 2022

06/14/2022 Forecast Update

Forecast Summary: Tuesday June 14th, 2022, through Wednesday June 15th, 2022

OZONE: Ozone concentrations are expected to reach USG levels for 8-hour averages.

PM-2.5: PM-2.5 concentrations are expected to range from Good to low-Moderate throughout this week.

AIR QUALITY ACTION , CLEAN AIR ACTION! DAY ADVISORY FOR WEDNESDAY JUNE 15TH FOR THE FOLLOWING COUNTIES…

IN WEST MICHIGAN: ALLEGAN…BERRIEN…CASS…KENT…MASON…MUSKEGON…OCEANA…OTTAWA…VAN BUREN COUNTIES

IN Southeast MICHIGAN: LENAWEE…MACOMB…MONROE…OAKLAND…ST. CLAIR…WASHTENAW…WAYNE COUNTIES

FORECAST DISCUSSION:

Today, Tuesday, looks to be warm but will have intermittent cloudiness throughout the day. Also, the wind direction looks to remain more southerly with a slight easterly component to it. Expect Moderate Ozone concentrations for the southern portions of the state with the possibility of isolated hourly USG levels. Overall, 8-hour averages for Ozone should remain in the Moderate range, however. 

Following some cloudiness on Tuesday, ample sunshine will ramp up Ozone development for southern portions of the state throughout the afternoon on Tuesday. The forecast for Wednesday has remained consistent with sunny skies, surface temperatures in the upper 90s F, warm upper-level temperatures, and both surface and upper-level southwest winds. These conditions warrant an Air Quality Action Day Advisory for the areas listed above for USG level Ozone concentrations. Thursday presents a slight cool down with a cold front making its way through the region early Thursday morning, which should help to clean out the airmass and lower Ozone concentrations. This forecast is made out until tomorrow in case conditions change and the current forecast needs to be reassessed.

PM-2.5 concentrations look to remain in the Good to Low-Moderate range.

EXTENDED FORECAST:

Models are still showing a cool down this weekend, but as stated above, I will be updating the forecast tomorrow, Wednesday.

Forecast updated by: Alec Kownacki, Tuesday June 14th, 2022 Next Forecast update: Wednesday June 15th, 2022.

06/13/2022 Forecast Update

Forecast Summary: Monday June 13th, 2022, through Tuesday June 14th, 2022

OZONE: Ozone concentrations are expected to range from Moderate to USG.

PM-2.5: PM-2.5 concentrations are expected to range from Good to low-Moderate throughout this week.

FORECAST DISCUSSION:

Summer-like and above-normal temperatures return this week as we start off with temperatures in the low-to-mid 80s F and quickly reach the mid-to-upper 90s F come midweek. Ample sunlight and southwest winds will also accompany the warm temperatures as we go through the week. The only exception is the possibility of severe storms Monday night into Tuesday morning, but the weather quickly rebounds with partly sunny skies and warm temperatures Tuesday. There is a slight cool down as we approach Thursday afternoon as a cold front makes its way through the Great Lakes region.   

Ozone is expected to range from Moderate to USG Tuesday afternoon into Wednesday. Tuesday Ozone development may be delayed due to potential storms early Tuesday morning. Due to this delay, isolated monitors may reach USG on the hourly-level, but widespread 8-hour average is not expected to reach USG. As stated above, warm temperatures both surface and upper-level, southwest winds, and ample sunlight will create a conducive environment for Ozone development in West Michigan and Southeast Michigan midweek. Wednesday looks to be the day to have the highest potential for 8-hour average Ozone to reach USG, which is why I will be updating the forecast tomorrow, Tuesday.

PM-2.5 forecasts look to range from Good to low-Moderate for the week. 

EXTENDED FORECAST:

Extended models look to agree with a slight cool down later this week into the weekend.

Forecast updated by: Alec Kownacki, Monday June 13th, 2022

Next Forecast update: Tuesday June 14th, 2022

06/10/2022 Forecast Update

Forecast Summary:

Friday, June 10th, 2022, through Monday, June 13th, 2022

OZONE: 8-hour average Ozone concentrations are expected to range from Good to Moderate through the forecast period.

PM-2.5: 24-hour average Fine Particulate will also range from Good to Moderate.

FORECAST DISCUSSION:

A couple systems moving through keep afternoon showers/storms in the forecast both Friday and Saturday. Both days will see partly sunny skies with high temperatures in the 70s. A boundary passing the state late Saturday into Sunday bring greater chances for precipitation, but conditions should dry out Sunday with clouds decreasing as the day progresses. High pressure slides in from the north Monday with generally sunny skies and temperatures warming closer to the 80s.

As for air quality, some cloud cover coupled with cooler upper-level temperatures on a northwest wind will hamper pollution development Friday and Saturday. Considering the warmer sun this time of year, hourly ozone may reach high enough in areas that see more sunshine for 8-hour levels to reach low-Moderate, however, we expect most locations will remain Good. The best chance for Moderate ozone would be in the southern portion of the state.

The air quality forecast remains the same for Sunday regarding a few Moderate ozone readings possible, mostly in the western portion of the state where clouds exit earlier in the day. By Monday, temperatures increase both at the surface and upper levels; however, winds look to have more of an easterly/southeasterly component which generally is not conducive for ozone development. Also, we should be coming off a generally low background of ozone. I do anticipate Moderate ozone to be more prevalent Monday, but readings higher than Moderate are not expected.

With the anticipated weather conditions, fine particulate should range from middle Good to middle Moderate through the forecast period.

EXTENDED FORECAST:

Extended forecast models show a warmup is still on track Tuesday into Wednesday. The question is possible storm development during that timeframe. On Monday the weather maps will be looked at and the forecast update will detail air quality conditions for next week.

Next forecast update: Monday, June 13th, 2022

06/06/2022 Forecast Update

Forecast Summary:

Monday, June 6th, 2022, through Friday, June 10th, 2022

OZONE: 8-hour average Ozone concentrations are expected to be generally Good through the week; Moderates may return early next week.

PM-2.5: 24-hour average Fine Particulate will range between Good and low-mid Moderate.

FORECAST DISCUSSION:

On and off systems this week will keep chances for precipitation in the forecast. There could be a break Thursday with high pressure moving in, however, a system to the south brings a return to rain chances for the end of the work week. Temperatures will be ranging a bit cooler, especially at upper levels. Because of this, ozone is not much of a concern and readings should be mostly Good with only a few low-Moderates through Friday. Fine particulate through the period will range from middle Good to low Moderate.

High pressure moves in late in the week and there is a hint at a warmup early next week. If this forecast pans out, more widespread Moderate ozone may return next Monday and/or Tuesday.

EXTENDED FORECAST:

Extended forecast models show warmer conditions moving in for the long-range period. This forecast will be updated Friday to detail expected air quality for the weekend into early next week.

Next forecast update: Friday, June 10th, 2022

5/31/2022 Forecast Update

FORECAST SUMMARY: Tuesday May 31st, 2022, through Monday June 6th, 2022

OZONE:

8-hour average Ozone concentrations are expected to be a mix of Good to Moderate on Tuesday, then mostly Good during the remainder of the work week followed by Good and scattered Low Moderates during the weekend.

PM-2.5:

24-hour average Fine Particulate concentrations are expected to be mostly Good to Low Moderate for the forecast period.

FORECAST DISCUSSION:

Tuesday will mark the last of the above-average temperatures enjoyed during the holiday weekend.  Even with the hot, sunny weather, Air Quality remained in check with ozone values in the Good to Low Moderate range throughout the state.  Particulates have mostly been in the Good category.

The hot weather ends, tonight, as a cold front sweeps into the state and exits about mid-day on Wednesday.  There is a chance for some convective actively, Tuesday night, but nothing too severe is expected. 

For the remainder of the work week and the beginning of the weekend, extremely pleasant weather is expected with afternoon temperatures near 70 under mostly sunny skies.  Another system may pass late Saturday leaving Sunday and Monday with a chance of showers and temperatures in the upper 70’s.

With the cooler, cleaner air expected, no Air Quality issues throughout this forecast period are expected.

EXTENDED FORECAST:

Air Quality should be mostly Good to begin the next work week.

Forecast updated by: Jim Haywood: Tuesday, May 31st, 2022

Next Forecast update: Monday, June 6th, 2022

5/27/2022 Forecast Update

FORECAST SUMMARY: Friday May 27th, 2022, through Tuesday May 31st, 2022

OZONE:

Ozone concentrations are expected to be in the mid-high Moderate range for portions of southern Michigan with the possibility of reaching USG levels.

PM-2.5:

PM-2.5 concentrations are expected to be Good throughout the weekend.

FORECAST DISCUSSION:

Changes to the forecast for the upcoming holiday weekend warranted an updated air quality forecast summary. Today, Friday, will see the Low pressure and associated frontal boundary that has brought rain to our area leave the region. Areas throughout Michigan will see temperatures in the mid-to-high 60s F with light NNW winds. Once the Low pressure exits the region early Saturday morning, a High-pressure sets up to our south providing light winds and ample sunlight. It is not until Sunday early morning when we see a true warmup. A warm front enters the region from the south and pushes temperatures into the upper 70s F and low 80s F. Dewpoint temperatures also look to increase with peak dewpoint being around the low-to-mid 60s F Sunday afternoon. Winds look to increase throughout the day on Sunday with the predominant wind direction being from the south. With this warm front, clouds look to be present throughout the day with some hours being completely overcast.

This trend continues into Monday with overcast skies for much of the morning but looks to open up as we go through the afternoon. Temperatures continue to rise with 80-degree F temperatures expected all throughout Michigan. Along with surface air temperatures, dewpoint temperatures are expected to rise as well, with peak dewpoint approaching 70 degrees F in some areas. Winds start out from the south and slowly shift to more southwesterly as we go through the late morning and early afternoon hours. As we go into the day on Tuesday, temperatures are expected to rise into the upper-80s F for the majority of Michigan with some northern Michigan areas in the low-80s F.

In terms of air quality, PM-2.5 does not look to be an issue whatsoever, Good concentrations are expected. The ingredients are looking to be present for ozone development in the latter half of the holiday weekend. Temperatures well into the 80s F and southwesterly winds are typically two of the main surface-level criteria we look for in surface-level ozone development. Along with surface-level, upper-level criteria such as temperature and wind direction help to forecast surface ozone as well. Upper-level temperatures in upper-teens to low-twenties Celsius are expected along with southwest winds—which are both surface ozone development indicators. There are still some uncertainties at this time, however. Cloud-cover models still show broken to overcast skies on Sunday and late-Monday morning. Also, high dewpoints sometimes inhibit the development of ozone, so dewpoints well into the upper-60s F for Sunday and Monday, could pose a “cap” for surface-level ozone development. Regardless of the uncertainties, Ozone is expected to be at least in the Moderate range, with some hourly-USG levels expected. I will be looking at the forecast and expected ozone ingredients throughout the weekend in case USG levels are expected to persist for longer than a few hours. If USG levels are expected to persist in the latter half of the forecast period, an updated forecast will be sent out with an associated Action Day.

EXTENDED FORECAST:

A cold front is expected to come through during the day on Wednesday, washing out the buildup of concentrations and drop temperatures into the mid-60s F.

Forecast updated by: Alec Kownacki, Friday May 27th, 2022

Next Forecast update: Tuesday May 31st, 2022

05/24/2022 Forecast Update

FORECAST SUMMARY:

Monday May 23rd, 2022, through Tuesday May 31st, 2022

OZONE:

Ozone concentrations are expected to be Good for the majority of the forecast period with Moderate concentrations expected in the latter half of the period.

PM-2.5:

PM-2.5 concentrations are expected to be Good to low-Moderate for the forecast period.

FORECAST DISCUSSION:

Temperatures return to the mid-60s and low-70s for much of Michigan this week as rain chances increase as we approach midweek.

To start off the week however, high-pressure is blanketing us providing ample sunlight and relatively light winds. As the week carries on, a Low-pressure system and associated frontal boundary impacts Michigan Wednesday into Thursday. The sunlight Michigan will be having today, Monday, and Tuesday gives way to rain and possible storms Wednesday and Thursday. Once the frontal boundary exits the area, clear skies return for Friday and for the majority of the upcoming holiday weekend. Temperatures increase as we progress through the weekend with northerly winds progressively shifting SSE as we approach Memorial Day.

In terms of air quality, although ample sunlight is expected early in the week, ozone is not expected to be an issue. This is because of the cooler temperatures and winds predominantly coming from the north. This combination will cut-off any production of surface-level ozone. Midweek rain and cloudy skies will keep ozone at bay also and the same scenario occurs later in the week as the beginning of the week with cooler temperatures and northerly winds. A warmup later into the weekend may warrant hourly Moderate Ozone, but overall 8-hour averages should be Good. PM-2.5 concentrations are expected to be light as well mainly because of the northerly winds and rain that is expected midweek. This will essentially washout any concentrations that build up from the relatively light winds early in the week.

EXTENDED FORECAST:

A warmup occurs next week as we bring in the month of June. With the warmup, Ozone concentrations are expected to increase, whereas PM-2.5 concentrations are expected to range from Good to low-Moderate. With the upcoming Memorial Day holiday, the next forecast update will be Tuesday, May 31st.

Forecast updated by: Alec Kownacki, Monday May 23rd, 2022

Next Forecast update: Tuesday May 31st, 2022

05/16/2022 Forecast Update

FORECAST SUMMARY: Monday, May 16th, 2022, through Monday, May 23rd, 2022

OZONE: 8-hour average Ozone concentrations are expected to be Good through midweek, Moderates are possible Thursday through Saturday with Good levels returning early next week.

PM-2.5: 24-hour average Fine Particulate levels will range between Good and low-mid Moderate.

FORECAST DISCUSSION:

Warm, summerlike conditions last week caused some increased ozone on Thursday, May 12th at monitors northwest of the Detroit area. Two monitors reported low-end USG while the rest of the state ranged mostly middle to upper Moderate. Moderate ozone lingered in several locations Friday with levels improving late in the weekend. For this week, cool high pressure dominates conditions Monday and Tuesday allowing for Good ozone and fine particulate. The next system to bring precipitation moves through late Tuesday into Wednesday. Fine particulate may reach low Moderate at a couple southeast locations Wednesday, otherwise, pollution levels will remain Good.

A warm front lifts north Thursday bringing back southerly winds and warmer temperatures. At this time Thursday and Friday look to be our best days for Moderate ozone; however, there should be enough cloud cover, especially Friday, to keep ozone Moderate. If our thoughts on this change, we will update this forecast. A frontal boundary lingers over the state Saturday with chances for scattered precipitation. The cold front takes its time passing east late Saturday, early Sunday. Fine particulate levels late in the week may range low Moderate, but generally Good ozone is expected past Friday.

One thing to be noted early this week is there is a wildfire, the Blue Lakes Fire, currently burning in portions of Montmorency and Cheboygan counties in northeast Michigan. The fire is in a rural area roughly 2,710 acres in size and as of late Sunday was 60% contained. The closest state monitors to the fire are in Houghton Lake and Seney. So far, neither of those monitors are reporting higher fine particulate levels due to the fire. This is something we will keep an eye on. Based on monitors, satellite, and current/expected weather conditions we do not feel there are widespread adverse pollution impacts. However, anyone near the location of the fire should be aware of the threat for increased levels of fine particulate.

EXTENDED FORECAST:

Extended forecast models show a cool down early next week with Good air quality expected.

Forecast updated by Stephanie Hengesbach: Wednesday, May 16th, 2022. Next forecast update: Monday, May 23rd, 2022.

05/11/2022 Forecast Update

FORECAST SUMMARY: Wednesday May 11th, 2022, through Monday May 16th, 2022

OZONE: 8-hour average Ozone concentrations are expected to be a mix of Good to Moderate during the forecast period.

PM-2.5:  24-hour average Fine Particulate concentrations are expected to be mostly Good to Low Moderate for the forecast period.

FORECAST DISCUSSION:

As expected, south-southeast winds pushed the highest ozone concentrations towards our Flint, Otisville, and Houghton Lake monitors.  Fortunately, concentrations stayed in check with maximum 8-hour averages staying in the mid-60 ppb range.

The remainder of the work week looks to be similar to the first half of the week.  Dew point temperatures drop during Thursday and Friday providing drier air than we are experiencing Wednesday.  Optimum dew points for Michigan ozone production tend to run in the mid 60-degree range and Thursday and Friday dew points look to run more in the mid to upper 50’s.

As a result, the forecast is in the Moderate range for the Lower Peninsula, but I will keep an eye on the monitors through Friday.  The potential for elevated ozone should end during the weekend as a passing front will create a cloud cover and showers for Saturday and cleaner air for Sunday and Monday.

EXTENDED FORECAST:

Air Quality should be Good to Moderate to begin the next work week.

Forecast updated by Jim Haywood: Wednesday, May 11th, 2022. Next forecast update: Monday, May 16th, 2022.

05/09/2022 Forecast Update

FORECAST SUMMARY: Monday May 9th, 2022, through Wednesday May 11th, 2022

OZONE: 8-hour average Ozone concentrations are expected to be a mix of Good to Moderate. during the first half of the week.

PM-2.5:  24-hour average Fine Particulate concentrations are expected to be mostly Good to Low Moderate for the forecast period.

FORECAST DISCUSSION

After a slow start during April, Spring weather looks to finally settle into the Midwest, this week.  The work week promises drier conditions with daily high temperatures in the 80’s.  With the longer days, stronger sun, and warmer temperatures, the threat of elevated ozone becomes a possibility.

Fortunately, the first half of the work week should be a low threat for ozone.  Surface winds will be predominantly south-southeast, which will push ozone forming pollutants over Lake Michigan towards the west side of the lake.  Locations downwind of Detroit, like the Flint and Saginaw areas will likely see the highest concentrations within the state, during this time.  Expect some cloudiness during Tuesday and Wednesday, along with potential showers during Wednesday to help subdue ozone formation and keep them in the Moderate range.

The potential for elevated ozone becomes more interesting for the last half of the work week with predominantly sunny days and temperatures in the mid to upper 80’s.  Winds become more southerly along the western lake shore which could allow for an afternoon lake breeze and higher ozone concentrations inland.  The forecast will be updated on Wednesday when there is more current information.

EXTENDED FORECAST:

Air Quality could reach Moderate to USG levels for ozone during the end of the work week.

Forecast updated by Jim Haywood: Monday, May 9th, 2022. Next forecast update: Wednesday, May 11th, 2022.

05/02/2022 Forecast Update

FORECAST SUMMARY:

Monday May 2nd, 2022, through Monday May 9th, 2022

OZONE: Ozone concentrations are expected to be Good through the forecast period.

PM-2.5:  PM-2.5 concentrations are expected to range from Good to low-Moderate for the forecast period.

FORECAST DISCUSSION

Michigan starts off May with high temperatures ranging from the upper-50s Fahrenheit to mid-60s Fahrenheit. A low-pressure and associated frontal system makes its way through the Midwest overnight Monday into Tuesday. The track of the low-pressure will stay to the south of Michigan but will provide rain to much of the lower peninsula all day Tuesday. As the low-pressure exits the area Tuesday night into Wednesday, Michigan dries out for a couple days as a high-pressure system tracks southward from Canada. This will provide winds coming from the north-northeast, but temperatures remain in the 60s. The dry weather is somewhat short-lived as another low-pressure takes a similar track to the one earlier in the week, but this one occurs late Thursday into Friday morning. Although not an all-day soaker, rain is expected for much of the morning and becoming spotty in the afternoon. Sunshine returns Saturday and Sunday with an increase in temperature continuing into next week.

In terms of air quality, Ozone concentrations will remain Good as there will be intermittent cloudiness throughout the week, so Ozone precursors will not have enough time to react with sunlight and build up concentrations. For PM-2.5, the rain that is expected Tuesday will help to clean out any concentrations that have built up in recent days. Also, steady wind, especially from the north, will keep concentrations at bay, but hourly Moderate conditions can be expected in southeast Michigan in the morning hours and if winds weaken.

EXTENDED FORECAST:

The extended forecast presents much of southern Michigan in the 70s for high temperatures next week, with northern Michigan well into the 60s. Air quality looks to remain Good as we approach next week

Forecast updated by: Alec Kownacki, Monday May 2nd, 2022

Next Forecast update: Monday May 9th, 2022

04/25/2022 Forecast Update

FORECAST SUMMARY:

Monday, April 25th, 2022, through Monday, May 2nd, 2022

OZONE: 8-hour average Ozone concentrations are expected to be Good through the forecast period.

PM-2.5:  24-hour average Fine Particulate levels will range between Good and low Moderate.

FORECAST DISCUSSION

 After a warmer weekend, cooler temperatures move in early this week and some snowflakes are even possible Tuesday. Cool high pressure settles in from the north Wednesday. This high will take its time exiting the region, lingering nearby the rest of the week. This will allow for dry conditions, and a slow warm up as the week progresses. The next system looks to hold off until Sunday.

As for air quality, clouds earlier in the week and cooler surface and upper-level temperatures will keep ozone Good through the forecast period. Good fine particulate is also expected to start the week; however, as winds weaken past mid-week some low-end Moderates may develop especially in the southeastern portion of the state. Winds begin switching more easterly/southeasterly late in the week as the high slides east of the state. At this time, wind speeds should keep the atmosphere well mixed where fine particulate higher than low Moderate is not anticipated.

EXTENDED FORECAST:

 Extended forecast models show the next system bringing chances for rain late Saturday or Sunday. Ozone should remain Good, but some Moderate fine particulate may develop ahead of the Sunday system. If the timing remains consistent, the associated front should pass Sunday with northerly winds Monday allowing for Good pollution levels.

Forecast updated by Stephanie M. Hengesbach: Monday, April 25h, 2022

Next forecast update: Monday, May 2nd, 2022

04/18/2022 Forecast Update

FORECAST SUMMARY:

Monday April 18th, 2022, through Monday April 25th, 2022

OZONE: 8-hour average Ozone concentrations are expected to be mostly Good through the forecast period with a possibility of Low Moderates during the weekend.

PM-2.5:  24-hour average Fine Particulate concentrations are expected to be mostly Good early in the week with a mix of Good and Moderates for the remaining forecast period.

FORECAST DISCUSSION

The week starts in the Good Air Quality range complete with snow showers and a reminder that winter is not ready to release its hold on Michigan. 

We get back into a southerly air flow on Wednesday, with southeasterly winds.  This may push Southeast Michigan into the Low Moderate category for fine particulates.  Southwesterly winds, by Thursday, could put Southwest Michigan into Low Moderates.

The most interesting feature of the week occurs during Saturday when the State falls into the warm air sector of an advancing frontal system.  Temperatures could easily fall into the mid or upper 70’s with southwesterly winds.  Winds should be brisk enough to keep the atmosphere well mixed, but it is possible to see Moderates, for both ozone and fine particulates.  A good day for getting early yard work done.

A front should pass on Sunday or Monday ending the warmer temperatures and we will likely see maximum temperatures around 40, by Tuesday of next week.

EXTENDED FORECAST:

Air Quality is expected to be Good to Low Moderates starting the next work week.

Forecast updated by Jim Haywood: Monday, April 17th, 2022

Next forecast update: Monday, April 25th, 2022

04/11/2022 Forecast Update

Forecast Summary:

Monday April 11th, 2022, through Monday April 18th, 2022

OZONE: 8-hour average Ozone looks to remain Good throughout the forecast period.

PM-2.5: 24-hour PM-2.5 concentrations are expected to range from Good to Moderate throughout the forecast period.

FORECAST DISCUSSION:

An active weather pattern looks to set up midweek Wednesday with possible thunderstorms in southern-mid Michigan. However, the beginning of the week starts out how the previous weekend ended—sunny and pleasant. For some areas late-Monday, though, light rain showers can be expected, but they will be short-lived. Tuesday looks to be one of the nicer days Michigan has had so far in 2022, but that is short-lived as well, as the aforementioned thunderstorms expected approach Wednesday afternoon. Accompanied with the possible storms is a cold front that will impact Michigan Thursday into Friday, dropping temperatures back to the 30s and 40s along with increasing winds throughout the region. Temperatures stick around the 40s for the weekend, but winds appear to decrease.

In terms of air quality, with the warmer temperatures early in the week and ample sunlight, ozone looks to increase in concentration. Those concentrations are not expected to cross the Moderate threshold, however. 24-hour average PM-2.5 concentrations look to be Good for the forecast period with some hourly Moderate concentrations mixed throughout the week. With the increase in winds later in the week, however, any buildup that occurs will likely be pushed out of the area, thus presenting Good concentrations for the weekend.

EXTENDED FORECAST:

Temperatures remain in the 40s to start next week as another cold front impacts Michigan Sunday into Monday. Overall air quality looks to remain Good.

Next forecast update: Monday April 18th, 2022

04/04/2022 Forecast Update

Forecast Summary:

Monday, April 4th, 2022, through Monday, April 11th, 2022

OZONE: 8-hour average Ozone concentrations are expected to be Good through the forecast period.

PM-2.5: 24-hour average Fine Particulate levels will range between Good and low Moderate during the forecast period.

FORECAST DISCUSSION:

An active weather pattern is setting up this week with precipitation in the forecast through much of it. Rain/snow should end Monday across the state as the system pulls east; however, the next system brings a warm front through late Tuesday/early Wednesday. After that, a stacked low-pressure area takes its time passing through the region. This low keeps on and off rain and/or snow chances through early Saturday. High pressure moves in late in the weekend warming up temperatures a bit.

As for air quality, clouds and cooler temperatures will keep ozone Good through most of the period. Lighter and/or a southerly component to the wind could allow for low Moderate fine particulate through the week, with the best chances for Moderates being in southern locations. Northwesterly winds develop Saturday as the low tracks east of the state; Good fine particulate and ozone is expected Saturday.

EXTENDED FORECAST:

Extended forecast models show high pressure and warmer temperatures Sunday, but the next system could bring precipitation back as early as Monday. Moderate pollution is a possibility later Sunday into Monday, but anything higher than low Moderate is unlikely. As always, this forecast will be updated if conditions change, and elevated pollution becomes probable.

Next Forecast update: Monday, April 11th, 2022

03/28/2022 Forecast Update

Forecast Summary:

Monday, March 28th, 2022, through Monday, April 4th, 2022

Ozone: 8-hour average Ozone concentrations are expected to be mostly Good through the forecast period.

PM-2.5: 24-hour average Fine Particulate concentrations are expected to be mostly Good with Wednesday being the only day which could see some scattered Moderates.

FORECAST DISCUSSION:

This weekly forecast carries us over into April so I will begin the inclusion of ozone into our forecast.  At this point, it looks to be a formality as March is projected to end like a lion with unseasonably cool temperatures.

Monday begins the current work week under a dome of high pressure, cold temperatures, and Good Air Quality.  This dome of high pressure will persist into Tuesday before slowly giving way to an approaching frontal system. 

The approaching warm front sector of this system will approach from the south with warm air overriding the cold air at the surface.  This could potentially cause some icing issues early Wednesday morning.  Fortunately, the warm front will pass early in the day and the associated warm air could push surface temperatures into the 50’s or low 60’s.  This will be the warmest day of the forecast period and the best chance for some scattered Low Moderate concentrations.  I do not expect these concentrations to be significantly high nor widespread, however.

The cold front attached to this system will pass through Wednesday night and put the area back into unseasonably cool temperatures and possible snow showers until the end of the work week.  The air will be clean, and we can expect Good Air Quality under this air mass.

Temperatures are not expected to warm much during the weekend before another front is projected to pass through the region during early Sunday.  That will reenforce the existing cold air to make early April seem more like early March.  On a positive note, the Air Quality should remain Good!

EXTENDED FORECAST:

Air Quality is expected to be Good starting the next work week.

Forecast updated by Jim Haywood: Monday, March 28th, 2022

Next forecast update: Monday, April 4th, 2022

03/21/2022 Forecast Update

Forecast Summary:

Monday, March 21st, 2022, through Monday, March 28th, 2022

PM-2.5: PM-2.5 concentrations are expected to range from Good to low-mid Moderate this week.

FORECAST DISCUSSION:

The week starts out with temperatures in the 60s for mid-Michigan and southward, with areas to the north creeping into the low-40s. A warm front somewhat stalls over southern Michigan today, Monday, which is the reasoning behind the warmer temperatures appearing to stay in the south. This warm front is associated with a low-pressure system that will gradually approach the region during the early part of the week. It will provide rain and some possible rumbles of thunder mid-week on Wednesday for southern portions of the state. Scattered rain and snow, to the north, continues into Thursday with temperatures dropping down to the low-mid 30s throughout Michigan. As we approach Friday, temperatures hang around the mid-30s with scattered rain and snow in the late afternoon timeframe.

Saturday continues the trend of temperatures in the 30s, but the winds pick up from the northwest providing colder air going into Sunday. PM-2.5 concentrations are forecasted to approach hourly Moderate levels in some southern Michigan areas earlier in the week. Mentioned above, as the low-pressure system makes its way into the area mid-week, this will clean out any PM-2.5 buildup that occurs. The increase in winds on Saturday will also help push out any concentration build up that occurs late-week.

EXTENDED FORECAST:

The start of next week appears to have two high-pressures to the north and south of Michigan providing somewhat stagnant conditions but overall air quality looks to remain Good.

Forecast updated by Alec Kownacki, Monday March 21st, 2022

Next forecast update: Monday, March 28th, 2022

3/14/2022 Forecast Update

FORECAST SUMMARY: Monday March 14th, 2022, through Monday March 21st, 2022

PM-2.5:  24-hour average Fine Particulate concentrations are expected to be mostly Moderate through the work week, transitioning to Good for most of the weekend.  Another warming trend, starting late in the weekend, may start a creep back into the Low Moderate range to begin the next work week.

FORECAST DISCUSSION

Following an unseasonably cold weekend, the work week begins with a warming trend.  Fine particulates are currently running in the Low Moderate range, in the Lower Peninsula, as of Monday morning.  This is not unexpected as warming air triggers more melting and the cold ground, underneath, settles the air and discourages dispersion and dilution. 

A stationary front is draped over the lower portion of the state, Monday morning, will also trap particulates near the surface.  This front may trigger some freezing rain, north of I-96, Monday night and Tuesday morning. 

A nice warming trend will occur during the Wednesday/Thursday time frame.  Like Monday, warmer air over cold ground creates a very stable atmosphere with little vertical dispersion.  As such, fine particulates will remain in the Moderate range.

The largest weather feature of the week looks to occur in the Thursday night/Friday morning time slot.  A classic combination of a warm front passage, Thursday night, followed by a cold front, early Friday, will usher in warmer air followed by sharply colder air for the weekend. 

Following the cold front, I anticipate Good Air Quality will then persist for the remainder of the weekend followed by another warming trend, with possible Low Moderates, beginning on Monday.

EXTENDED FORECAST:

Air Quality is expected to be Good to Low Moderate starting the work week.

Forecast updated by Jim Haywood: Monday, March 14th, 2022

Next forecast update: Monday, March 21st, 2022