FORECAST SUMMARY: Monday, July 18th, 2022, through Tuesday, July 19th, 2022
OZONE: 8-hour average Ozone concentrations are expected range from Moderate to USG Monday and Tuesday.
PM-2.5: 24-hour average Fine Particulate will primarily range from Good to middle Moderate.
FORECAST DISCUSSION:
A frontal boundary sinking south into northern portions of Michigan into Tuesday will bring clouds and chances for precipitation. Further south, high pressure dominates with northerly winds Monday changing to a south/southwesterly flow Tuesday. Surface and upper-level temperatures increase the next couple days and as southwesterly winds develop Tuesday; increased ozone becomes more likely. There is already an Action Day Advisory in place Monday for the southeastern portion of the state. We will continue the Action Day into Tuesday and will add to the Action Day locations in west Michigan as well.
The frontal boundary takes its time sinking south and depending on the timing, increased ozone in the southeast may continue into Wednesday. We will be issuing another forecast update Tuesday to determine if the Action Day will need to be extended in the southeast for Wednesday. At this time, it looks like cloud cover and high dew points will keep ozone from increasing above Moderate Wednesday across most of the state.
As for fine particulate, readings will likely increase towards mid-week with more widespread Moderates by Wednesday. Until then, readings will continue in the upper Good to low Moderate range.
EXTENDED FORECAST:
The cold front passes east by Thursday bringing in a dryer airmass; however, temperatures do not drop off much in its wake. Pollution levels will likely range from Good to Moderate towards the end of the workweek.
Forecast updated by: Stephanie Hengesbach: Monday, July 18th, 2022
Next Forecast update: Tuesday, July 19th, 2022