FORECAST SUMMARY: Tuesday June 10, 2025, through Wednesday June 11, 2025
Ozone:
Ozone concentrations are expected to be in the Moderate to Unhealthy for Sensitive Groups range.
PM-2.5:
PM-2.5 concentrations are expected to be in the Good to Moderate range.
Air Quality Advisory for Wednesday June 11, 2025
The Michigan Department of Environment, Great Lakes, and Energy (EGLE) has declared an Air Quality Advisory for June 11, 2025, for elevated levels of ozone in southwestern counties of Michigan. Pollutants within those areas are expected to be in the Unhealthy for Sensitive Groups (USG, Orange AQI) range.
The Air Quality Advisory is in effect for the following Michigan counties:
Allegan, Berrien, Kent, Muskegon, Ottawa, and Van Buren
FORECAST DISCUSSION:
Dry and clear conditions will continue throughout today, Tuesday, and will carry into tomorrow, Wednesday. Surface temperatures today will hang around the low-to-mid 70s before increasing into the mid-to-upper 80s on Wednesday. Winds shifting to a more southwestern direction will help increase the temperatures into the 80s. The wind direction will also increase Ozone development in the southwest Michigan area, especially along the Lake Michigan shoreline. The ingredients for a conducive Ozone environment will be in place tomorrow, hence the Air Quality Advisory for Ozone. Residual smoke within the atmosphere may also help to produce Ozone in the impacted areas. Wildfire smoke for northern areas, into the upper peninsula, may return in high-Moderate concentrations later today and into tomorrow. Model guidance has not treated the outlook today accurately, but multiple hours of USG-level PM-2.5 is not expected at this time.
After Wednesday, a Low-pressure system looks to move over Michigan with a stationary front staying just to our south come Friday. This set up will keep the atmosphere moist enough to hold clouds but not cause a total washout in terms of rain. With the Air Quality Advisory in place, this forecast will be updated Wednesday morning to look at the days ahead.
EXTENDED FORECAST:
Partly cloudy conditions look to persist through the rest of the week, but temperatures hang around the 70s to 80s. Air quality will hang around the Good to Moderate range after Wednesday.
Next Forecast update: Wednesday June 11, 2025