There are several things to be concerned about over just the next 24 hours.
First, storm chances late tonight into tomorrow morning could be on the stronger side with main threat being straight line wind gusts along the leading edge of the line of thunderstorms.
Then, the threat shifts to heavy rain. One to three inches of rain is likely in the areas that get hit with the heaviest rain. This area will be just southwest of Eau Claire. There is a Flash Flood Watch in effect through tomorrow morning for Buffalo, Pepin, and Trempealeau Counties for this threat.
Once the rain ends and sun comes out tomorrow, it will heat up fast. Expect high temperatures near 90 degrees with dew points in the low to middle 70s. This will make it feel like the upper 90s during the afternoon, perhaps briefly near 100. Lows will only fall to around 70 which doesn’t allow for much relief overnight. Friday looks a couple degrees warmer with highs in the low to mid 90s and similar dew points in the 70s, making it feel near or above 100 in the afternoon. Uff-da!
A Heat Advisory is in effect for Buffalo, Chippewa, Dunn, Eau Claire, Jackson, Pepin, Pierce, St. Croix, and Trempealeau Counties from Noon Thursday through 7 p.m. Friday for the high heat and humidity.
Scattered showers and thunderstorms return Friday night as a cold front finally approaches, but it’ll take some time to move through. Another round of showers and storms comes Saturday night into Sunday morning. It’ll finally feel less humid by Sunday afternoon, or at least closer to typical summer levels. Monday and Tuesday look refreshing with lower humidity and highs near or just below 80 and plenty of sunshine.