FORECAST SUMMARY: sunday, july 9, 2023 through monday, july 10, 2023

OZONE: 8-hour average Ozone concentrations will range between Good and Moderate Sunday, with USG levels possible Monday

PM-2.5: 24-hour average Fine Particulate levels will also range between Good to Moderate.

FORECAST DISCUSSION:

After a rainy Saturday, conditions dry out Sunday with high pressure in control. Plenty of sunshine is expected with seasonable temperature. Surface winds turn southerly during the day, but a northerly upper-level flow and cooler temperatures should keep ozone and fine particulate in the Good to Moderate range.

By Monday, the high slides east with southerly winds both at the surface and upper-levels bringing in warmer conditions. The next weather system will be approaching from the northwest. Clouds and precipitation move into the upper portion of the state, but plenty of sunshine is expected across most of the lower Peninsula. Mondays anticipated weather conditions are conducive for increased ozone; therefore, we are issuing an Air Quality Action Day for ozone on Monday in parts of west and southeast Michigan.

As for fine particulate, smoke models were evaluated and a plume sinks into the region Monday ahead of the next weather system. The plume does not seem to be thick enough to significantly increase fine particulate, but Moderate readings by Monday are likely.

 EXTENDED FORECAST:

Forecast models show on and off precipitation chances through the coming week. Air quality levels will be detailed tomorrow with the Monday update, but at this time we don’t anticipate readings higher than Moderate.

 Next Forecast update: Monday, July 10, 2023