FORECAST SUMMARY: Thursday, June 8th, 2023, through Friday, June 9th, 2023

OZONE: Ozone concentrations are expected to be in the Good to Moderate range.

PM-2.5: PM-2.5 concentrations will be in the USG range with some hourly concentrations in the Unhealthy range.

AIR QUALITY ACTION DAY ADVISORY FOR THURSDAY JUNE 8TH AND FRIDAY JUNE 9TH UNTIL NOON

THE ACTION DAY ADVISORY INCLUDES THE FOLLOWING SOUTHERN MICHIGAN COUNTIES:

LAKE, MASON, NEWAYGO, OCEANA, ALLEGAN, KENT, MUSKEGON, OTTAWA, BRANCH, CALHOUN, KALAMAZOO, ST. JOSEPH, BERRIEN, CASS, VAN BUREN, BARRY, CLARE, CLINTON, EATON, GRATIOT, INGHAM, IONIA, ISABELLA, MECOSTA, MONTCALM, OSCEOLA, ARENAC, BAY, GLADWIN, HURON, MIDLAND, SAGINAW, SANILAC, TUSCOLA, GENESEE, LAPEER, SHIAWASSEE, HILLSDALE, JACKSON, LENAWEE, LIVINGSTON, WASHTENAW, MACOMB, MONROE, OAKLAND, ST. CLAIR AND WAYNE

FORECAST DISCUSSION:

Canadian wildfire smoke continues to drift into our area due to the NNE winds currently in place. The Ontario fires, which are directly impacting us, do not seem to be letting up. The current weather pattern appears to remain in place until at least tomorrow morning when the High-pressure system is expected to drift more south. This will open the door for a Low-pressure and associated cold front to approach the region Saturday afternoon and into Sunday. When this change in weather patterns occurs, we are expecting to see a shift in winds which will be more NNW instead of the current NNE which is bringing the smoke right towards us. But for the next day, we are still expecting PM-2.5 concentrations to exceed the USG range and into the Unhealthy range. We have noticed that these smoke plumes are coming in waves. This explains why for some hours we are seeing USG to Unhealthy PM-2.5 concentrations and for other hours we are seeing Moderate concentrations. But nonetheless, overall PM-2.5 concentrations will be in the USG to Unhealthy range until at least tomorrow, Friday, which is why this forecast will be updated tomorrow morning.

EXTENDED FORECAST:

Wildfire smoke looks to persist for the coming days, so overall air quality will remain poor.

Forecast updated by: Alec Kownacki: Thursday, June 8th, 2023

Next Forecast update: Friday, June 9th, 2023