FORECAST SUMMARY: Monday August 11, 2025, through Tuesday August 12, 2025
Ozone:
Ozone concentrations are expected to be in the Good (Green AQI) to Moderate (Yellow AQI) range.
PM-2.5:
PM-2.5 concentrations are expected to be in the Unhealthy for Sensitive Groups (Orange AQI) range.
Air Quality Advisory for the Upper Peninsula on Monday, August 11th until noon on Tuesday, August 12th
The Michigan Department of Environment, Great Lakes, and Energy (EGLE) has issued an Air Quality Advisory for elevated levels of fine particulate (PM2.5) across the Upper Peninsula of Michigan. Pollutants within those areas are expected to be in the Unhealthy for Sensitive Groups (USG, Orange AQI) range.
The Air Quality Advisory includes the following counties:
Alger, Baraga, Chippewa, Delta, Dickinson, Gogebic, Houghton, Iron, Keweenaw, Luce, Mackinac, Marquette, Menominee, Ontonagon, Schoolcraft
FORECAST DISCUSSION:
We start off this new work week with surface temperatures expected to range from the upper-70s to upper-80s with relatively high dewpoint temperatures as well. A predominantly southwest wind will keep temperatures high Monday afternoon and into Tuesday with rain chances increasing we go into Monday afternoon and evening. Rain chances remain on Tuesday as well, with the capability of storms producing.
There is currently an Air Quality Advisory in place for the Upper Peninsula today, through noon on Tuesday. Wildfire smoke from Canadian fires is expected to move through the upper Great Lakes today and tomorrow, Tuesday. After this initial plume moves through, a potential additional plume may cross over the same areas into Wednesday due to a cold front moving through the region. If there needs to be an extension of the Advisory, it will be made on Tuesday morning when this forecast is updated.
Ozone development will be watched this afternoon and into Tuesday as favorable conditions exist for Ozone to produce over west and southwest Michigan. However, high dewpoint temperatures and the potential of rain showers are currently looking to keep Ozone development at bay. Mid-to-high Moderate concentrations are expected with the possibility of hourly Unhealthy for Sensitive Groups concentrations in southwest Michigan. As of now, the 8-hour Ozone average is expected to remain in the Moderate range.
EXTENDED FORECAST:
A slight cool down is expected mid-to-late week after a cold front moves through and drops surface high temperatures into the low-80s. This is short-lived as hot temperatures return for the weekend ahead, along with high dewpoints. Ozone and PM-2.5 concentrations will be monitored throughout the week.
Next Forecast update: Tuesday August 12, 2025