7/13/2020 Forecast Update
FORECAST SUMMARY:
Monday, July 13th, 2020 through Friday, July 17th, 2020
OZONE: 8-Hour average Ozone concentrations will be mostly Good on Monday increasing to a mixture of Good and Moderate on the remaining days through Friday.
PM-2.5: 24-hour average Fine Particulate concentrations will range from Good to Moderate.
FORECAST DISCUSSION
The last forecast discussion, posted last Wednesday, held true for the most part. During Thursday, we saw several monitors in Southeast Michigan go over the USG threshold. Monitors in West Michigan managed to stay just under 70 ppb. The cold front that went through on Friday did an excellent job of cleaning out the atmosphere. In fact, levels on Sunday resembled more what we see in January rather than July.
Monday concentrations are also expected to stay in the typical winter range before high pressure passes over, during Tuesday, and we get into a southwest wind pattern. Fortunately, since the air is extremely clean, we will stay mostly Good but we can expect a bit of an uptick in Southeast Michigan and along the Lake Michigan lake shore.
A front is expected to pass during Wednesday and the associated clouds and showers will help keep numbers down. The clean-out from that front should keep us mostly Good with some scattered Moderates through Friday.
Saturday could be interesting as a persistent southwest wind, sunny skies, and increasing temperatures could present a problem. As such, Friday will be our next forecast unless conditions change enough to warrant an update before then.
EXTENDED FORECAST:
Air Quality should be mostly Good to Moderate going into the weekend. We could see elevated ozone during the weekend.