Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 78, NWS La Crosse, WI
NWS La Crosse, WI issued this severe thunderstorm warning at May 27, 2026, 5:49 PM CDT for Clark County, Wisconsin. It was in force for 56 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- May 27, 2026, 5:49 PM CDT (22:49 UTC)
- Expired
- May 27, 2026, 6:45 PM CDT
- In force
- 56 min
- Issued by
- NWS La Crosse, WI
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
County Clark County, WI
The radar
The La Crosse radar (KARX), 111 km from the middle of the area, began a volume at 22:51 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 10.8 hours before the alert went out and 236 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 146 J/kg
- Mixed-layer CIN
- -272 J/kg
- Mixed-layer LCL
- 1326 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 28 m²/s²
- 0-3 km storm-relative helicity
- 22 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS La Crosse, WI wrote its last area forecast discussion before this severe thunderstorm warning went out at May 27, 1:24 PM CDT, 4 hours 25 minutes earlier. Its key messages:
- Another shot (20-50%) for showers and thunderstorms this afternoon and evening. A strong thunderstorm or two may develop.
- Above normal temperatures continue through the weekend.
Area forecast discussion, May 27, 1:24 PM CDT, 4 hours 25 minutes before
Area Forecast Discussion National Weather Service La Crosse WI 124 PM CDT Wed May 27 2026 .KEY MESSAGES... - Another shot (20-50%) for showers and thunderstorms this afternoon and evening. A strong thunderstorm or two may develop. - Above normal temperatures continue through the weekend. && .DISCUSSION... Issued at 123 PM CDT Wed May 27 2026 Shower and thunderstorm potential this afternoon/evening 17z WV satellite shows northwesterly flow aloft over our forecast area with a weak disturbance in this flow over western Lake Superior. At the surface, a cold front is located over northern WI. This afternoon and evening, as the weak disturbance moves southeast and the backdoor cold front begins to push through the area, showers and thunderstorms may develop. With warm surface temperatures and dewpoints once again in the 60s, would seemingly expect a similar outcome to yesterday but with convection favoring our east, away from the upper ridge building over the eastern Dakotas. Compared to yesterday, mid levels are drier and am thus concerned that updraft attempts may struggle. Have therefore kept PoPs in the 20-50 range for now. In any case, deep boundary layer continues to indicate a risk for a stray severe gust and, with deep shear just a touch stronger than Tuesday at around 25 knots, could see a stray severe hail report once again. Above normal temperatures ahead Guidance continues to point toward persistent upper ridge over the central CONUS with cyclonic flow centered in eastern Canada. After a post-frontal day with temperatures near normal Thursday and Thursday night, temperatures return to the 80s for Friday through next Tuesday. As time goes on and the upper ridge slowly weakens, could get some afternoon/evening convection Sunday through Tuesday but confidence in details is very low at this time. && .AVIATION /18Z TAFS THROUGH 18Z THURSDAY/... Issued at 1225 PM CDT Wed May 27 2026 VFR conditions expected through the TAF period. A weak boundary dropping south through WI later this afternoon and evening will carry a 30 to 40% chance of triggering some thunderstorms. LSE would be on the western periphery of this storm potential so have included a PROB30 to the TAF this evening. Otherwise light winds will pick up out of the east tonight, becoming a bit breezy at RST with gusts around 20 knots. Some guidance suggests a small chance of MVFR ceilings at RST closer to daybreak Thursday, but confidence is low. && .ARX WATCHES/WARNINGS/ADVISORIES... WI...None. MN...None. IA...None. && DISCUSSION...Ferguson AVIATION...Kurz
Hazardous weather outlook, May 27, 1:27 PM CDT, 4 hours 22 minutes before
Hazardous Weather Outlook National Weather Service La Crosse WI 127 PM CDT Wed May 27 2026 MNZ088-096-WIZ017-029-032>034-041>044-053>055-282230- Winona-Houston-Taylor-Clark-Buffalo-Trempealeau-Jackson-La Crosse- Monroe-Juneau-Adams-Vernon-Crawford-Richland- 127 PM CDT Wed May 27 2026 This Hazardous Weather Outlook is for portions of southeast Minnesota...central Wisconsin...north central Wisconsin... southwest Wisconsin and west central Wisconsin. .DAY ONE...This Afternoon and Tonight Storms are possible (20 to 50 percent) this afternoon and evening. If a stronger storm forms, then strong wind gusts or hail would be possible. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... No action needed. .EMERGENCY MANAGEMENT COORDINATION... No webinar is scheduled. IAZ008>011-018-019-029-030-MNZ079-086-087-094-095-WIZ061-282230- Mitchell-Howard-Winneshiek-Allamakee-Floyd-Chickasaw-Fayette- Clayton-Wabasha-Dodge-Olmsted-Mower-Fillmore-Grant- 127 PM CDT Wed May 27 2026 This Hazardous Weather Outlook is for portions of north central Iowa...northeast Iowa...southeast Minnesota and southwest Wisconsin. .DAY ONE...This Afternoon and Tonight No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... No action needed. .EMERGENCY MANAGEMENT COORDINATION... No webinar is scheduled. APF
The office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 6:39 PM CDT | Severe Thunderstorm Warning | ARX | Jackson | 41 min |
Nearby
Severe Thunderstorm Warnings in Wisconsin, 2026Every severe thunderstorm warning in 2026
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.