FORECAST SUMMARY: Wednesday June 21st, 2023, through Thursday June 22nd, 2023
OZONE: Ozone concentrations are expected to be in the Moderate to USG range.
PM-2.5: PM-2.5 concentrations are expected to be in the Good to Moderate range.
FORECAST DISCUSSION: There is currently an air quality alert for surface-level Ozone in place for areas in southeast Michigan and along the Lake Michigan shoreline. Surface temperatures well into the 80s, warm upper-level temperatures, relatively light winds and ample sunlight are the main culprits for this ozone development. The air quality alert for west and southwest Michigan has been extended through tomorrow as warmth and sunlight persists. Southeast Michigan may see more clouds building throughout the day tomorrow, so we expect ozone development to be hampered by that. We traditionally do not see high ozone with predominantly easterly winds, but we have seen ozone production with easterly winds already this year in Michigan and throughout the region, so we are heeding what has happened earlier this year and continuing the alert for west Michigan counties. Also, later in the afternoon tomorrow, it looks like winds over Lake Michigan shift to more northwesterly flow, so pollutants and ozone over the lake could be blown into southwest Michigan areas.
This forecast will be updated tomorrow to reassess the forecast for ozone.
EXTENDED FORECAST: There appears to be a chance of rain Friday and into Saturday which will help clean out the airmass of pollutants.
Forecast updated by: Alec Kownacki: Wednesday, June 21, 2023
Next Forecast Update: Thursday June 22nd, 2023