FORECAST SUMMARY: Monday, July 24, 2023, through Tuesday, July 25, 2023

OZONE:  8-hour average ozone concentrations are expected to be mostly Moderate.

PM-2.5:  24-hour average Fine Particulate concentrations are expected to be widespread USG.


AIR QUALITY ACTION DAY ADVISORY FOR MONDAY JULY 24, BEGINNING AT NOON...
UPPER PENINSULA ONLY

AIR QUALITY ACTION DAY ADVISORY FOR TUESDAY JULY 25...
STATEWIDE


FORECAST DISCUSSION

Smoke returns to the region courtesy of numerous large Canadian wildfires.  Smoke, aloft, has already reached Michigan and surface smoke in Minnesota and Wisconsin is already reaching the USG and Unhealthy range as it mixes down.  The higher levels of surface smoke will be reaching the Upper Peninsula as today progresses, therefore we are triggering an Action Day Advisory for the U.P. beginning at noon.  Widespread smoke will affect the entire state, during Tuesday, prompting a Statewide advisory.

Fortunately, this appears to be a short-lived event with most of the smoke pushed out of the state Tuesday night.  As we have seen in previous events, this year, the surface smoke has left behind some residual pollutants which could convert to ozone under ideal conditions.  By Thursday, we could be seeing temperatures in the low 90’s under clear skies.  Dew points will rise to around 70 degrees making for hot, muggy weather with the potential for elevated ozone.

Since we are expecting hotter weather with ozone potential, this forecast will be updated Tuesday morning and as necessary as the week progresses.


EXTENDED FORECAST:

Air Quality should be generally Moderate to potentially USG through the work week.

Forecast updated by Jim Haywood: Monday, July 24, 2023
Next forecast update Tuesday, July 25, 2023