FORECAST SUMMARY: Tuesday, July 25, 2023, through Wednesday, July 26, 2023
OZONE: 8-hour average ozone concentrations are expected to be mostly Good to Moderate.
PM-2.5: 24-hour average Fine Particulate concentrations are expected to be widespread Moderate to USG.
AIR QUALITY ACTION DAY ADVISORY FOR TUESDAY JULY 25 REMAINS IN EFFECT STATEWIDE...
FORECAST DISCUSSION
The Tuesday Air Quality Action Day Advisory remains in effect, statewide, for Fine Particulates. Monitors are continuing to read high concentrations along the Wisconsin Lake Michigan shore and that smoke is currently moving into Michigan. Some of our monitors are already reading in the USG range. While I expect to see hazy conditions, outside, I do not expect to see the extremely high concentrations into the Unhealthy range that we saw a couple of weeks ago. That said, the expected USG conditions are still of concern and our messaging to reduce outdoor strenuous activity and remain indoors with air conditioning remains intact.
Fortunately, all of the smoke models are indicating today’s smoke will be flushed out of the state during Wednesday. Conditions may still be somewhat hazy in the morning hours but should improve during the day. The potential for some severe weather and heavy rains also exists which would help cleanse the air.
By Thursday, the weather should return to normal hot, humid summer-like conditions under sunny skies. Our experience with the smoke, this summer, is that some chemicals from the smoke can be left behind if there is not a total cleanout and those chemicals readily convert to ozone under favorable conditions. And those conditions currently look favorable on Thursday.
As a result, I intend to update this forecast Wednesday morning…
EXTENDED FORECAST:
Air Quality should be generally Moderate to potentially USG through the remainder of the work week.
Forecast updated by Jim Haywood: Tuesday, July 25, 2023
Next forecast update Wednesday, July 26, 2023