FORECAST SUMMARY:
Tuesday, July 7th, 2020 through Wednesday, July 8th, 2020
OZONE: 8-hour average Ozone concentrations will be Moderate with a good chance of USG along the southern tier counties of Lake Michigan and Southeast Michigan.
PM-2.5: 24-hour average Fine Particulate concentrations will range from upper Good to Moderate.
AN ACTION DAY ADVISORY IS ISSUED FOR TUESDAY JULY 7th AND WEDNESDAY JULY 8th FOR THE FOLLOWING COUNTIES:IN WEST MICHIGAN:ALLEGAN... berrien… CASS… KENT... MUSKEGON... ottawa… AND van buren COUNTIESIN Southeast MICHIGAN:LIVINGSTON… MACOMB… MONROE… OAKLAND… ST. CLAIR… WASHTENAW… AND WAYNE COUNTIESFORECAST DISCUSSION:
Hot, sunny conditions continue as we move through mid-week. Forecast models finally show some relief Friday as a cold front passes through.
On Monday we saw our first day with USG ozone across the southeast; levels remained mostly Moderate across the rest of the state. Wind patterns are now starting to become more persistently west and southwest at all levels of the atmosphere. This means that we can expect ozone numbers to steadily climb past mid-week. Most of the ozone models have been performing well and almost all are showing a jump in numbers Tuesday and Wednesday. As the atmosphere gets more humid, chances increase for pop-up showers/storms, but that will be scattered enough not to help in the big picture. Therefore, we are continuing our Air Quality Advisories in the west and southeast.
Fine particulate has also been climbing the past few days. Most locations have been Moderate and more widespread Moderates are likely until the front passes Friday.
EXTENDED FORECAST:
Air Quality will stay mostly Moderate with USG in the most susceptible areas the next few days; improvement will likely come towards the end of the week.