734 FXUS63 KARX 031042 AFDARXArea Forecast Discussion National Weather Service La Crosse WI 542 AM CDT Fri Oct 3 2025
.KEY MESSAGES...
- Near or Record Warmth Expected through Saturday Night
- Maybe Some Elevated Fire Weather Concerns This Weekend
- Rain Chances Return from Sunday Afternoon through Monday Night
- Near Normal Temperatures Return from Tuesday into Thursday
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.DISCUSSION... Issued at 254 AM CDT Fri Oct 3 2025
Near or Record Warmth Expected through Saturday Night
A strong 500 mb ridge of high pressure will be located over the Upper Mississippi River Valley through Saturday night. 925 mb temperatures will range from 22 to 24C. Mixing these temperatures to the surface will result in high temperatures in the mid- and upper 80s. There maybe even a few lower 90s. These temperatures are around 20 degrees warmer than normal. These temperatures will be warm enough that some record high temperatures and even warm low temperature records could be tied or broken. Both La Crosse and Rochester have only reached or exceeded 90 degrees on 4 days in October.
Lowered Afternoon Dew Points for the Weekend
Soundings continue to show that we will likely mix up to 850 mb on both Saturday and Sunday. A warm nose between 850 and 800 mb will likely limit us from mixing any higher than that. This will result in our dew points likely falling into the mid- and upper 50s on Saturday and lower to mid-50s on Sunday. As typical, the NBM is likely too high with the surface dew points, so populated the grids with the 10th NBM percentile.
With the southerly winds increasing into the 15 to 25 mph range and drying vegetation mainly west of the Mississippi River, there could be the potential for elevated fire weather concerns. The one limiting factor is that despite lowering the dew points, relative humidities look to stay in the 30s and 40s.
Rain Chances Return from Sunday Afternoon through Monday Night
A slow moving cold front will move slowly southeast through the area from Sunday afternoon through Monday Night. There should be enough convergence for showers and maybe a few storms (surface- based CAPES up to 250 J/kg). With the better 0-3 and 0-6 km shear in the wake of the front, not anticipating any organized severe weather at this time.
Near Normal Temperatures Return from Tuesday into Thursday
In the wake of the front, near normal temperatures will return from Tuesday into Thursday. High temperatures will be primarily in the 60s and low temperatures will range from the mid-30s to mid-40s.
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.AVIATION /12Z TAFS THROUGH 12Z SATURDAY/... Issued at 540 AM CDT Fri Oct 3 2025
VFR conditions expected for the next 24 hours. A couple highly isolated light showers may impact the LSE terminal early this morning but coverage and chances are too low to include in this package. In any case, the showers shouldn`t lead to any category reductions overall. Otherwise dry conditions will prevail at the terminals through the period with winds out of the south/southwest at less than 10 kts.
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.CLIMATE... Issued at 254 AM CDT Fri Oct 3 2025
Here are daily record highs/warm lows for Friday and Saturday with the current forecasted high and lows. (Record (Year) / Forecast)
October 3 Record Highs: La Crosse: 91 (1997)/ 88 Rochester: 93(1997)/ 86
October 4 Record Highs: La Crosse: 88 (2005)/ 87 Rochester: 84 (2005)/ 85
October 4 Warm Record Lows: La Crosse: 72 (2005)/ 66 Rochester: 71 (2005)/ 67
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.ARX WATCHES/WARNINGS/ADVISORIES... WI...None. MN...None. IA...None.
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DISCUSSION...Boyne AVIATION...Barendse CLIMATE...Boyne
NWS ARX Office Area Forecast Discussion