FORECAST SUMMARY:
Sunday, July 14th, 2019 through Monday, July 15th, 2019
AN ACTION DAY ADVISORY IS IN EFFECT FOR MONDAY, JULY 15th IN THE FOLLOWING MICHIGAN COUNTIES...IN WEST MICHIGAN:
ALLEGAN... KENT... MUSKEGON... AND OTTAWA COUNTIESOzone: 8-Hour average Ozone concentrations will be a mixture of Good and Moderate through Sunday. Several areas may experience USG levels on Monday
PM-2.5: 24-hour average Fine Particulate concentrations will be mostly Good to Low Moderate.
FORECAST DISCUSSION
Sunday looks to remain in theGood/Moderate category, throughout the state, with favorable winds and temperatures.
However, hopes of staying in the Good/Moderate category, during Monday, have been diminished with the latest model runs. All the weather models have surface winds shifting from southeast, in the morning hours, to the south/southwest during the afternoon. Temperatures are expected to reach near 90 with a muggy dew point around 70. Earlier model runs were indicating a decent cloud cover, Monday afternoon, which would have reduced ozone production. But the later runs are trending more for clearer skies although pop-up showers could occur.
Almost all the ozone models are showing significant ozone production in the Allegan, Ottawa, Kent, and Muskegon area, which would be consistent with the wind pattern. As such, an Action Day Advisory has been issued for those counties.
EXTENDED FORECAST:
There is potential for poor Air Quality during the next work week as hot, muggy weather settles in.