FORECAST SUMMARY:
FORECAST SUMMARY: Monday, July 26th, 2021 through Friday, July 30th, 2021
Ozone: 8-hour Ozone concentrations are expected to be mostly Good throughout the week. There will be some pooling of Ozone concentrations over Lake Michigan and up the shoreline, so this may allow some West Michigan areas to approach low-Moderate concentrations.
PM-2.5: PM-2.5 concentrations are expected to dissipate throughout the day and throughout the week. There are still smoke plumes aloft over Michigan, but excessive smoke is not expected to mix downwards toward the surface for the first half of the week. Smoke models are showing some near-surface smoke towards Wednesday and the latter half of the week.
FORECAST DISCUSSION:
Upper-level winds are expected to be west to north westerly (WNW) throughout the week until Thursday. Upper-level temperatures are expected to be in the mid-upper teens today and into Tuesday until a cold front moves into the area which helps to lower upper-level temperatures. These lower temperatures are expected Tuesday through Friday.
Surface temperatures are expected to be in the low-mid 80s for the week with dewpoint temperatures in the mid-upper 60s all week. The cold front on Tuesday gives way to a High-pressure system that hangs around the area until Saturday. Surface winds are expected to be WNW until the front comes through and makes the winds more variable. Along with upper-level winds, Thursday and into Friday, surface winds shift to a more northerly flow. Overcast skies Tuesday and Thursday may inhibit the development of Ozone concentrations at the surface but Wednesday has partly cloudy skies until the front moves in. After reassessing concentrations on Wednesday and further updates to the forecast will be made if necessary.
EXTENDED FORECAST:
High-pressure sticks around until Saturday when another frontal boundary enters the area and quickly exits the region. After the front moves out on Sunday, another High-pressure establishes itself in the Great Lakes region.