477 FXUS63 KGRB 010358 AFDGRBArea Forecast Discussion National Weather Service Green Bay WI 1058 PM CDT Tue Sep 30 2025
Updated aviation portion for 06Z TAF issuance
.KEY MESSAGES...
- A warming trend this week, with daily high temperatures peaking Friday and Saturday in the 80s.
- No precip through at least Friday, with most places staying dry until early next week.
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.DISCUSSION... Issued at 300 PM CDT Tue Sep 30 2025
Little to no change to the forecast since the last issuance. Forecast impacts are low through Friday, with only small chances of precip starting Saturday.
Satellite imagery shows most locations have been sunny this afternoon, with some high clouds drifting in from the west at times. Some afternoon cu has been trying to develop in central WI, but overall moisture and lift for this is limited.
Overnight, high clouds becoming more abundant and a steady light wind will keep temps in the 50s. This will also limit fog formation. Small hints at a few patches of fog possible in central Wisconsin, but that would be about all.
Similar weather continues for the next few days as large high pressure near Hudson Bay slow builds eastward. Main day-to-day change will be warming temperatures, with highs Friday and Saturday well into the 80s for many locations.
Precip: There are minor precip chances this weekend. The next main opportunity for rain comes late Sunday into Monday as a cold front comes through the state. Temperatures will also cool off by about 10 degrees.
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.AVIATION...for 06Z TAF Issuance Issued at 1052 PM CDT Tue Sep 30 2025
VFR flight conditions are expected across most of the forecast area through the TAF period, with BKN high clouds prevailing. There could be a few locations with light fog overnight, but surface winds around 5 knots, boundary layer winds of 15 to 25 kts and thick high clouds should limit coverage. At this point, have only added a mention of MVFR fog at the MTW TAF site, where the dew point depression was already down to 1 degree late this evening.
E winds will be around 5 kts overnight, with SE winds of 5 to 10 kts with gusts to 15 kts Wednesday afternoon.
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.GRB WATCHES/WARNINGS/ADVISORIES... None.
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DISCUSSION.....KLJ AVIATION.......Kieckbusch
NWS GRB Office Area Forecast Discussion