textproduct: La Crosse
This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.
KEY MESSAGES
- Fog possible in central and southwest Wisconsin tonight.
- Small rain chances on Thursday and Thursday evening. Mainly west of Highway 52 in northeast Iowa and southeast Minnesota.
- Rain chances from Friday into the weekend are lowering.
- Better rain chances from Tuesday into Wednesday.
DISCUSSION
Issued at 108 PM CDT Wed Sep 23 2026
Tonight
Light winds near the surface underneath a subsidence inversion in southwest and central Wisconsin will result in the development of fog overnight tonight and on Wednesday morning. Elsewhere, skies will be partly to mostly cloudy.
Low temperatures will range from the lower 40s to lower 50s. The coldest temperatures will be found in central and north- central Wisconsin.
Thursday and Thursday evening
A shortwave trough will move northeast through the Upper Mississippi River Valley. This trough will be moving into drier air and increasing subsidence as it moves into a ridge over the Great Lakes. As a result, the better chances of rain (20-40 percent) will be west of Highway 52 in northeast Iowa and southeast Minnesota.
High temperatures will be in the mid- to upper 60s. Low temperatures will range from the mid-40s to mid-50s.
Friday into the Weekend
Another shortwave trough will move slowly northeast through the Upper Mississippi River Valley from Friday into the upcoming weekend. Like its predecessor, it will be moving into a ridge over the Great Lakes. As a result, the models have been gradually lowering rainfall amounts and rain chances.
High temperatures range from the lower 60s to lower 70s. Low temperatures will range from the mid-40s to mid-50s.
Tuesday into Wednesday
A longwave trough will move east through the Mid- and Upper Mississippi River Valley. This will bring rain into the region. There are some models that bring tropical moisture northward into the region. Meanwhile, other models show that this plume of tropical moisture will be southeast of the area.
High temperatures will be in the mid- to upper 60s. Low temperatures will range from the mid-40s to mid-50s.
AVIATION /18Z TAFS THROUGH 18Z THURSDAY/
Issued at 108 PM CDT Wed Sep 23 2026
As the nocturnal inversion develops tonight, light winds will remain near the surface. This will result in the development of some IFR/MVFR fog in southwest and west-central Wisconsin between 23.06z and 23.15z.
ARX WATCHES/WARNINGS/ADVISORIES
WI...None. MN...None. IA...None.
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