FORECAST SUMMARY: Friday, April 14, 2023, through Monday, April 17, 2023

OZONE: 8-hour average ozone concentrations are expected to be mostly Moderate to USG during Friday then Good to Low Moderate for the remaining forecast period.

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

AN ACTION DAY ADVISORY REMAINS IN EFFECT FOR THE FOLLOWING MICHIGAN COUNTIES FOR FRIDAY, APRIL 14: ALLEGAN, BENZIE, BERRIEN, CASS, GRAND TRAVERSE, KALAMAZOO, KENT, LEELANAU, MANISTEE, MUSKEGON, OCEANA, OTTAWA, MASON, ST. JOSEPH, AND VAN BUREN

FORECAST DISCUSSION:

Everything appears to still be on track for elevated ozone in our sensitive areas for Friday.  Fortunately, this looks to be a one-day event.  An approaching cold front will bring in increasing cloud cover on Saturday and the front should pass on Sunday.  This will put an end to this episode.

The air behind the front will be chilly for the first half of next week to remind us that this is still early Spring.  But the Air Quality will be Good.

The earliest an Action Day had been called since the start of the program was May 4, 1999 in SE Michigan.  So, this marks the earliest Action Day in the history of the program. 

EXTENDED FORECAST:

Air Quality should be mostly Good begin the next work week.

Next Forecast update: Monday, April 17, 2023