FORECAST SUMMARY: Friday June 21st, 2024, through Monday June 24th, 2024

OZONE:

Ozone concentrations are expected to be in the Mid-High Moderate (Yellow AQI) range.

PM-2.5:

PM-2.5 concentrations are expected to be in the Good (Green AQI) to low-Moderate (Yellow AQI) range.

 FORECAST DISCUSSION:

We end the week on a relatively cooler note with an emphasis on cooler due to the fact that much of southern Michigan will still reach the upper-80s. Much of northern Michigan and into the Upper Peninsula have remained unscathed from this week’s heatwave as this will continue into the weekend with temperatures in northern Michigan ranging from the 60s to 70s. A majority of us start this Friday off cloudy as well, with northern parts of the state forecasted to have clouds hang around all day with southern portions seeing clearing as the day carries on. In areas with clearing skies, temperatures will increase rather quickly as the warm, and humid airmass is still positioned over southern Michigan. As the day carries on, the warm airmass is expected to drift northward which will create a slightly warmer Saturday for southern portions of the state along with bringing more clouds to the area. Tomorrow, Saturday, is expected to be yet another hot day for southern Michiganders but lingering clouds should provide some relief. Tomorrow night will see the frontal boundary bringing warm temperatures, carry north across the state and provide rain showers into early Sunday morning. Immediately behind this front is yet another front, but as a cold front, which will help cool down temperatures before we start the next work week. The combination of cooler temperatures, lower humidity, and rain showers will help clean out the current dirty airmass we have been dealing with all week. We start Monday roughly 10 degrees cooler than what we were this past Monday and considerably less humidity.

Tomorrow, winds shift to more southwesterly flow, which would be a good indicator for Ozone in west Michigan. However, lingering clouds and a somewhat clean airmass due to Thursday’s storms, will not allow for Ozone to exceed USG concentrations for an 8-hour average. Mid-High Moderate concentrations are expected with a slight possibility of an hourly USG, but overall 8-hour averages should remain in the Moderate category. Saturday is expected to be the last possible high Ozone day for the next couple of days as the front into Sunday morning will keep the airmass clean. PM-2.5 concentrations look to be in the Good-Moderate range as well as no high smoke or particulate concentrations are expected

EXTENDED FORECAST:

As stated above, we start Monday off roughly 10 degrees cooler than this past Monday with a much cleaner airmass.

Next Forecast update: Monday June 24th, 2024