FORECAST SUMMARY: Tuesday, June 21st, 2022, through Thursday, June 23rd, 2022

OZONE: 8-hour average Ozone concentrations are expected to be USG to Unhealthy on Tuesday in West Michigan with SE Michigan staying mostly in the High Moderate range. Wednesday and Thursday should be a mix of Good to Moderate.

PM-2.5: 24-hour average Fine Particulate concentrations are expected to be mostly Good to Low Moderate for the forecast period.

AN AIR QUALITY ACTION DAY ADVISORY REMAINS IN EFFECT FOR TUESDAY, JUNE 21ST FOR THE FOLLOWING COUNTIES…

IN WEST MICHIGAN:

ALLEGAN…BERRIEN…CASS… KENT… MASON…MUSKEGON…OCEANA…OTTAWA… VAN BUREN COUNTIES

FORECAST DISCUSSION:

The West Michigan Action Day forecast for Monday was spot-on.  All of the West Michigan monitors exceeded the 8-hour average 70 ppb threshold for USG with six of those monitors reaching the Unhealthy category.  Unfortunately, this episode will almost certainly continue through Tuesday as the Action Day remains in effect. 

Fine Particulates have remained in check, during this episode, and should continue to do so during the Tuesday Action Day.

This episode will end after a cold front sweeps through the state, Wednesday morning.  While we will see a clean-out in terms of Air Quality, temperatures will still be running on the hotter side with daily highs in the upper 80’s.

Winds look to swing back to the southwest during Friday.  With the long periods of daylight and strong solar radiation, this could pose a concern for Air Quality.  As a result, the forecast will be updated on Thursday morning.  Hopefully, this would only be one day of concern as Saturday looks to be mostly cloudy and another cold front sweeps through on Sunday with cooler weather to follow.

EXTENDED FORECAST:

The warm temperatures and sunny skies look to stick around for the next couple of days. Air quality will be monitored throughout the week.

Forecast updated by: Jim Haywood: Tuesday, June 21, 2022
Next Forecast update: Thursday, June 23, 2022