FORECAST SUMMARY:
Friday, June 28th, 2019 through Saturday, June 29th, 2019
Ozone: 8-Hour average Ozone concentrations will be a mixture of Good and Moderate through Friday.
PM-2.5: 24-hour average Fine Particulate concentrations will be mostly Good with some Low Moderate.
FORECAST DISCUSSION
A large area of rain and storms have impacted a line from southern Wisconsin through mid-Michigan much of Friday morning. Not only does this impede any new ozone formation but it also provides a cleaning out effect as clean upper air is drawn down to the surface and clouds prevent the photo-chemical process. That should eliminate any serious threat of elevated ozone during Friday.
Some cloud cover and potential showers will linger through Saturday morning as a stagnant front, down by the border area, finally slips southward as a cold front. Winds behind that front will be light but biased to the northwest. While the afternoon is expected to be sunny, hot, and humid, it should be relatively clean air.
While Sunday is expected to be sunny and hot, it probably will not be quite as hot as Saturday. Winds will still be light but remain biased to the northwest keeping the bad air to our south.
Since any slight jiggle in the expected meteorology could cause a significant change to the forecast, latest predictions will be reviewed Saturday morning, and the forecast will be updated.
EXTENDED FORECAST:
Air Quality is expected to remain mixed Good to Moderate going into the weekend.