FORECAST SUMMARY:
FORECAST SUMMARY: Monday, June 28th, 2021, through Friday, July 2nd, 2021
OZONE: 8-Hour average Ozone concentrations are expected to be mostly Good throughout the week with a chance of a few low Moderate concentrations due to southwesterly flow.
PM-2.5: 24-hour average Fine Particulate concentrations will be mostly Good with low-Moderates possible.
FORECAST DISCUSSION:
Monday, June 28th, presents relatively clear skies with dewpoints in the upper 60s to low 70s for the first half of the week. A lingering front provides a chance of some rain showers Monday afternoon and into the evening. The lingering front starts to lift off to the north as a Low-pressure system approaches the Great Lakes region and brings a cold front with it going into Wednesday, June 30th. With this frontal passage, winds shift from a southwesterly flow to a more westerly flow through mid-week. After the frontal passage Wednesday, a high-pressure system makes its way into the region from the north.
Going into Thursday, winds shift to a more northerly flow with temperatures in the upper-70s thanks to the passing cold front and this pattern stays relatively the same going into Friday, July 2nd. There is some question on an upper-level system bringing scattered precipitation Thursday and/or Friday, but by the end of the week and into the weekend a high-pressure system sets up directly over the Great Lakes region providing relatively clear skies. ozone levels will remain Good throughout the week and into the weekend with perhaps a few Moderates due to the southwesterly flow earlier on in the week. Particulate Matter appears to remain mostly Good with some areas reaching low Moderate levels throughout mid-week.
EXTENDED FORECAST:
Extended forecast models show a high-pressure system sitting over the Great Lakes region for much of the weekend. Going into Monday, July 5th, there appears to be a cold front approaching the region from the north which may impact the area early next week. We will post a forecast update on Friday to better detail air quality conditions for the July 4th weekend.