FORECAST SUMMARY: Tuesday, May 30, 2023, through Wednesday, May 31, 2023
Ozone: 8-hour average Ozone concentrations will range between Moderate and USG.
PM-2.5: 24-hour average Fine Particulate should remain upper Good to low Moderate.
...AIR QUALITY ACTION DAY ADVISORY FOR TUESDAY MAY 30th AND WEDNESDAY MAY 31st...
THE ACTION DAY ADVISORY IS IN EFFECT FOR THE FOLLOWING MICHIGAN COUNTIES...
IN WEST MICHIGAN:
ALLEGAN... BENZIE… berrien… CASS… GRAND TRAVERSE... KALAMAZOO... KENT... LEELANAU… MANISTEE… MUSKEGON... Oceana… ottawa… MASON… ST JOSEPH AND van buren COUNTIES
IN Southeast MICHIGAN:
GENESEE... LAPEER... LENAWEE... LIVINGSTON… MACOMB… MONROE… OAKLAND… ST. CLAIR… WASHTENAW AND WAYNE COUNTIES
FORECAST DISCUSSION:
The weather forecast remains on track with dry conditions and above normal temperatures continuing through the week. Increased moisture the next couple of days could trigger very isolated showers/storms Wednesday or Thursday, but the chances for precipitation are very small and almost not worth mentioning.
As anticipated, ozone levels have been on an upward trend over the past few days and weather conditions yesterday resulted in 13 monitors reaching the USG range. With surface and upper-level temperatures increasing and winds taking on more of a southerly component, the trend of increased ozone will continue. There is an Air Quality Action Day for ozone in place for today (Tuesday) across the west Michigan lakeshore counties and for the southeast portion of the state. We are continuing this Action Day into tomorrow (Wednesday) and a few counties have been added to include the cities of Kalamazoo, Flint, and the surrounding areas.
Air Quality levels will be monitored during the day, and if any areas not in the current Action Day look to exceed the USG threshold, the forecast will be updated from Moderate to USG triggering EnviroFlash notifications.
Fine particulate levels have been ranging between upper Good and low Moderate. We anticipate increases in fine particulate as well, however, levels should not reach higher than low to middle Moderate through the period.The same airmass remains over the region until the coming weekend. With that, expected increasing temperature, humidity, and stagnation through the period. Since the threat for increased ozone continues through the week, this air quality forecast will be updated daily until the threat ceases.
EXTENDED FORECAST:
Air Quality should be generally Moderate to USG through the coming weekend.
Next Forecast update: Wednesday, May 31, 2023.
Forecast updated by: Stephanie M Hengesbach. Tuesday, May 30, 2023