Only .30" of rain has fallen in La Crosse so far this month of September, but that number could really grow this week with a rather active weather pattern setting up.
ALERT DAY for later today into part of tonight. Please be extra weather aware and stay tuned for updates. (See below for details)
We are watching a strong warm front over Iowa. Very warm and moist air is being lifted over the front. This moisture will only increase this evening into tonight. The result will be a good chance of more showers and t-storms this evening into tonight. In addition to deep moisture, there is a lot of shear along the front. As a result, some of the storms could be severe, especially over southeastern Minnesota into northern Iowa. A TORNADO WATCH is in effect for these areas through 10 PM. The storms will then move into southwest and western Wisconsin after about 8 PM. Some of these storms could still be strong to severe and produce torrential rainfall. The storms should clear the area after midnight, but more storms are possible after 2 AM or 3 AM. While there is some risk of severe with these storms, the main threat would be heavy rainfall. Otherwise, it will be mild and muggy tonight with lows in the upper 60s to low 70s. Please remain weather aware tonight.
Any storms will end early Tuesday, in fact most will probably taper or shift east by sunrise. Otherwise, expect decreasing clouds and a very summer-like day. It will be warm with highs well into the 80s... and humid too. Winds will be from the SW around 10-20 mph, with gusts around 25 mph possible.
Looking Ahead... A cool front then approaches the region from the northwest midweek, but stalls before fully tracking through. This will bring another good chance of showers and t-storms Wednesday as the front bumps into warm and moist air that will be in place. High temps will likely remain in the mid 80s Wednesday and Thursday. Since the front looks to stall, then more showers and t-storms are a good bet on Thursday as well. This could lead to locally heavy rainfall this week, in fact some forecast models are indicating several inches (2" to 3"+) are possible through Thursday. This may lead to flooding concerns, so stay tuned.
The cool front should finally sweep through by Friday, leading to a dry, cooler and less humid day with highs in the low 70s. It will also be breezy.
It looks to remain breezy through the weekend with most of Saturday looking dry with partly cloudy skies. Highs Saturday will be in the mid-upper 70s. Slight chance of showers and t-storms Saturday night into Sunday. A bit warmer Sunday with highs around 80F.
Isolated t-showers are possible next Monday, then Tuesday looks dry at this point. High temps early next week look to stay a bit above average in the upper 70s to low 80s.
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