FORECAST SUMMARY:
Saturday, June 20th, 2020 through Monday, June 22nd, 2020
OZONE: 8-Hour average Ozone concentrations will be mostly Moderate and USG Saturday with levels ranging between Good to Moderate Sunday and MondayPM-2.5: 24-hour average Fine Particulate concentrations will range from upper Good to low Moderate.
AN ACTION DAY ADVISORY IS IN EFFECT FOR SATURDAY FOR THE FOLLOWING MICHIGAN COUNTIES...
IN WEST MICHIGAN:
ALLEGAN... BENZIE… BERRIEN… CASS… GRAND TRAVERSE... KALAMAZOO… KENT... LEELANAU… MANISTEE… MUSKEGON… OCEANA… OTTAWA… MASON… ST. JOSEPH… AND VAN BUREN
IN SOUTHEAST MICHIGAN:
GENESEE… LAPEER… LIVINGSTON… MACOMB… MONROE… OAKLAND… ST. CLAIR… WASHTENAW… AND WAYNE
FORECAST DISCUSSION:
Another warm day with increased ozone was seen Friday and one more day of similar conditions is expected Saturday. Ozone will range from Moderate to USG as plenty of sunshine remains, along with increased surface and upper level temperatures. Because of this, we have an Air Quality Action Day Advisory in place for Saturday for the counties listed above. By Sunday, clouds associated with an approaching boundary, along with chances for scattered storms, will help keep ozone from increasing like we have experienced this week. Ozone on Sunday is not expected to reach higher than Moderate. While there is a very small chance for a monitor or two may reach low-end USG, the threat is not high enough to warrant an action day on Sunday.
Much of the same is expected Monday, warmer temperatures linger and a boundary over the region will trigger scattered storms. There again is a threat for isolated USG levels, but I feel clouds will keep readings in the Moderate range. I will evaluate maps Sunday morning and if my thoughts on Mondays forecast changes, I will send an update.
Fine particulate has been running mostly Moderate and levels will remain generally Moderate through Monday.
EXTENDED FORECAST:
Models show a stronger front passing the state Tuesday which will bring northwesterly winds, cooler temperatures, and cleaner air in its wake. Air Quality by Tuesday/Wednesday should be back to the Good range.
Forecast Updated by Stephanie M. Hengesbach June 20th, 2020
Next forecast update: Monday, June 22nd, 2020