FORECAST SUMMARY: Wednesday June 19th, through Thursday June 20th, 2024

OZONE:

Ozone concentrations are expected to be in the high-Moderate (Yellow) to USG (Orange AQI) range.

PM-2.5:

PM-2.5 concentrations are expected to be in the Good (Green AQI) to Moderate (Yellow AQI) range.

 FORECAST DISCUSSION:

The majority of the state stays cloudy today, Wednesday, with clearing along the Lake Michigan shoreline early-to-mid afternoon. Even with the cloudy skies, surface temperatures in the lower peninsula are still expected to reach the 90s, with heat indices higher due to high dew points and associated humidity. Due to the heat and humidity, pop up rain and possible thunderstorms are possible across the southern portion of the lower peninsula, especially in the southeast Michigan area. These showers and possible storms can be expected for the remainder of the week solely due to the heat and humidity providing the “fuel” for storms to develop.

There is an active Air Quality Advisory currently for western Michigan lakeshore counties along Lake Michigan. As stated above, there will be a clearing of skies this afternoon, which will allow for Ozone to develop along the lakeshore with the help of predominantly southwesterly winds. North of the Muskegon area will stay under clouds longer than the south, which is why the cutoff for the Advisory is Muskegon County.

For tomorrow, Thursday, winds look to shift throughout the day from northerly, to southerly, and back to northerly as a weak Low-pressure system moves across the southern state borders. Ozone does not look to be an issue for western Michigan areas due to these winds shifts.

EXTENDED FORECAST:

A slight cool down comes on Friday, with an emphasis on slight, because it will still be in the upper-80s. Pop up storms are possible with a last push into the 90s coming Saturday.

Next Forecast update: Thursday June 20th, 2024