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Sinsinawa, Wisconsin Weather Forecast Discussion

949
FXUS63 KARX 220538
AFDARX

Area Forecast Discussion National Weather Service La Crosse WI 1238 AM CDT Mon Sep 22 2025

.KEY MESSAGES...

- Scattered showers and thunderstorms through Monday with localized heavy rain at times. Some storms may become strong, bringing primarily a risk for hail.

- Temperatures stay near normal with highs in the low to mid 70s through much of next week.

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.DISCUSSION... Issued at 131 PM CDT Sun Sep 21 2025

Storm Potential Today and Monday:

An upper level low will make its way southeastward from North Dakota this afternoon to northern Wisconsin by this evening. At the 700mb level, a wave moves through this afternoon giving the area, mostly Wisconsin, a low chance (20 to 40%) for showers and storms to form. With only around 1000 J/kg of MLCAPE and limited shear (up to 20kts of 0-3km shear) these showers and storms will be scattered in nature and pulse up and down. Heading into the evening, another wave and frontal boundary moves into southern Minnesota. This will be the focus for more widespread shower and storm development through the overnight. While there are some differences between CAMs as far how widespread the convection is, they are all mostly suggesting the front stays near our common border with Minneapolis`s CWA throughout the overnight period. With the incoming boundary, there is slightly better shear than the past few days (around 25 to 30 kts of 0-1km and 0-3km shear). Instability is expected to linger through the overnight with up to 1000 J/kg of MLCAPE, so some thunderstorms will be possible and with lapse rates around 6 to 6.5 C/km lingering through the evening, can`t rule out that a storm could be strong to even severe, particularly in southeast Minnesota. The better chances are along and west of the I-35 corridor in southern Minnesota, northern Iowa.

This boundary will shift southeastward through our CWA on Monday during the day. With a little better instability and shear parameters as today, showers and storms are expected along the front with a low chance of a strong to severe storm possible all along the boundary as it moves through, however the strong to severe threat will be quite isolated. Any stronger storm that does develop, the main threats would be hail and damaging winds. Rainfall amounts are generally between 0.20 and 0.5". Looking at HREF LPMM, there a couple pockets of 1 to 1.25" in portions of southeast Minnesota, northeast Iowa, and north central Wisconsin.

Storm Potential From Tuesday into the Weekend:

Heading into Tuesday, the upper level low continues to move off to the east while another trough digs down into the Central CONUS from the Intermountain West. This trough is expected to close off and merge with the current upper level low near the Great Lakes region around the midweek timeframe. While some lingering showers and storms will be possible (low chances around 15 to 25%) for portions of northeast Iowa and southern Wisconsin, the lows will stay far enough away causing most of the CWA to be dry from midweek through the weekend. There is some disagreement in how these lows interact and where exactly they merge. About 40% of EPS members suggest that the low coming up from the south will be closer in proximity to our CWA increasing our precipitation chances into the weekend, while almost every member of the GEFS has a dry solution for the same period. Regardless of rain chances, high temperatures into next weekend look to largely stay in the low to mid 70s while the lows are generally in the low to mid 50s.

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.AVIATION /06Z TAFS THROUGH 06Z TUESDAY/... Issued at 1238 AM CDT Mon Sep 22 2025

Showers and storms will be the initial TAF concern through the remainder of the overnight and into the morning hours as an axis of increasing moisture transport will continue to develop showers and storms near I-90. MVFR to IFR vsby reductions will be likely with more robust showers and storms. As these showers and storms exit during the morning, low-level moisture will build in across the local area resulting in a period of MVFR cigs until some afternoon mixing increases ceiling heights above MVFR levels. Later into the afternoon and evening, an area of low-level convergence will push south towards the I-90 corridor. As this occurs, much of the CAMs develop some convection along this. However, confidence remains low on exact how this will manifest this far out but MVFR to IFR vsby reductions would be likely with any storms. Consequently, have included some prob30 TSRA mention in the TAF issuances during this period but will continue to monitor forecast trends and adjust as needed.

&&

.ARX WATCHES/WARNINGS/ADVISORIES... WI...None. MN...None. IA...None.

&&

$$

DISCUSSION...Cecava AVIATION...Naylor

NWS ARX Office Area Forecast Discussion

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