A complex of severe storms produced large and destructive hail over portions of southwestern Wisconsin during the pre-dawn hours on April 18th. Numerous instances of hail of golf ball sized or greater were reported across southern Grant County with the largest being baseball sized in Platteville.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS ARX wrote it up.
A complex of severe storms produced large and destructive hail over portions of southwestern Wisconsin during the pre-dawn hours on April 18th. Numerous instances of hail of golf ball sized or greater were reported across southern Grant County with the largest being baseball sized in Platteville.
The local office's own words before the first event, 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 the first event at Apr 18, 12:25 AM CST, 3 hours 45 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service La Crosse WI 125 AM CDT Fri Apr 18 2025 .KEY MESSAGES... - Scattered showers/storms early this morning. Stronger storms will produce small hail, potentially strong wind gusts. Showers could linger into the afternoon. - Another round of widespread rain Sunday afternoon into Monday. A storm or two possible. Low end snow chances (10-30%) north of I-94. - Cool weekend but warming for next week (highs back into the 60s, near 70 for some). && .DISCUSSION... Issued at 125 AM CDT Fri Apr 18 2025 THIS MORNING: RAP showing a reassertion of the low level jet into northeast IA by 08z with some elevated Fgen and a ripple in the upper level flow (evidenced in latest watervapor satellite imagery). This should spark more showers and storms with about 1500 J/kg of MUCAPE to work with. Enough instability for hail potential. Low level capping/stable layer will keep the storms elevated. However, some hints in the HRRR that stronger winds could still be brought toward the sfc. Not anticipating severe, but marginally large hail (1/2-3/4") and enhanced gusts (behind any storm) is possible. AFTERNOON: convective elements could develop in the blanket of low stratus that is currently advecting southward from northern MN/WI. Whether showers develop is debatable as the cold air advective signal isn't strong, nor is there much in near sfc lapse rates. With low cloud bases though, light pcpn won't have far to go. SUNDAY/MONDAY: storm system set to bring rain, some storms, and can't say no to minor snow accums in the north. GEFS/EPS continue to take a shortwave trough out of the desert southwest Sat, developing a negative tilt as it lifts northeast across the upper mississippi river valley Sunday night. WPC clusters also all show this, although some differences in strength/timing. The storm will be undergoing strengthening as it approaches, thanks in part to the left exit region of a curved 300 mb jet. Sfc low placement in the EPS and GEFS members do show a fair amount of variability - so the storm is not "locked in" by any means. Of note in the recent EPS run is the bulk of its members have the low center farther northwest of operational - suggesting the local area could be under a warmer regime and the deformation pcpn would be displaced northwest. Not necessarily a trend, but something to monitor. Low level moisture transport is good as a 50 kt 850mb jet noses into the storm's deformation region. Ample, sloping Fgen on the north side, evidenced in time/height x-sections with a strong swath of low level warm air advection. QG convergence is also hefty and deep in the column, maxing out Sun afternoon/evening. All in all, a lot of forcing accompanying this storm with a nice fetch of moisture to fuel broad areas of pcpn. Meager elevated instability indicated in the GFS/NAM bufkit soundings, all above a sizable low level capping inversion. Some isolated thunder possible, mostly south. For amounts, 25-75% for QPF roughly sits from 1/2 to 1" for Sun night through Monday, with the upper 10% pushing more than 1 1/4". There are even higher outliers, especially in the EPS which has a non-zero SoT and a couple members suggesting 3-4" are possible. Looks like a good soaking for most of the local area. Snow still can't be ruled out. The GrandEnsemble continues to suggest a 10-30% for measurable snow north of I-94, with about a 10- 20% chance that to reach an inch. Any snow would be confined to cold, grassy surfaces and wouldn't stick around if realized. AFTER MONDAY: Moving into the middle part of next week, broad long wave ridging/height rises progged in the long range guidance. Warmer, at/above normal temps return in this scenario with highs pushing back into the 60s. LREF has 10 to 20% chances for 70+ degree highs. It's not a stout ridge, so ripples in the flow would have a chance to spin across the region - providing occasional rain chances. Decent consensus between most of the GEFS and EPS members for just that later Tue/Tue night. && ..AVIATION /06Z TAFS THROUGH 06Z SATURDAY/... Issued at 1050 PM CDT Thu Apr 17 2025 The current cluster of showers and storms moves out of the area shortly after 06Z. A second cluster of storms may move through between 08-14Z, mainly south of an RST to KY50 line. IFR to LIFR stratus is expected to build in after 06-09Z behind the first line of storms and persists for the remainder of the TAF period, lifting to IFR/MVFR during the day. Overnight SSE winds of 5-10 kts veer to the northwest at 10-15G20-25kts for the day on Friday. && .ARX WATCHES/WARNINGS/ADVISORIES... WI...None. MN...None. IA...None. && DISCUSSION...Rieck AVIATION.....Skow
Hazardous Weather Outlook National Weather Service La Crosse WI 1002 PM CDT Thu Apr 17 2025 IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029- 032>034-041>044-053>055-061-190715- Mitchell-Howard-Winneshiek-Allamakee-Floyd-Chickasaw-Fayette- Clayton-Wabasha-Dodge-Olmsted-Winona-Mower-Fillmore-Houston- Taylor-Clark-Buffalo-Trempealeau-Jackson-La Crosse-Monroe-Juneau- Adams-Vernon-Crawford-Richland-Grant- 1002 PM CDT Thu Apr 17 2025 This Hazardous Weather Outlook is for portions of southeast Minnesota...northeast Iowa and southwest into central Wisconsin. .DAY ONE...Tonight An isolated severe storm is possible overnight south of Interstate 90. Hail up to 1 inch in diameter and winds of 60 mph would be the main threats. .DAYS TWO THROUGH SEVEN...Friday through Wednesday Additional thunderstorms could occur Friday morning to early afternoon, mainly in southwest Wisconsin. .SPOTTER INFORMATION STATEMENT... .EMERGENCY MANAGEMENT COORDINATION... No webinar is scheduled. nofwd
Special Weather Statement National Weather Service La Crosse WI 148 AM CDT Fri Apr 18 2025 IAZ008>010-018-019-029-MNZ086-087-094-095-181000- Mitchell-Howard-Winneshiek-Floyd-Chickasaw-Fayette-Dodge-Olmsted- Mower-Fillmore- Including the cities of Osage, Cresco, Decorah, Charles City, New Hampton, Oelwein, Dodge Center, Rochester, Austin, and Preston 148 AM CDT Fri Apr 18 2025 ...Another Round Of Storms...Some Could Be Strong... Clusters of storms spread east, northeast across the area through 5 am. Stronger storms will be capable of 1/2 to 3/4" hail with winds gusts upwards of 35 mph possible. Locally heavy rain will accompany most storms. Rieck
The La Crosse radar (KARX), 85 km away, was scanning. The volume nearest the first event began at 10:10 UTC.
9 hail. Local standard time, as filed.
The public reported quarter sized hail in Richland Center. The report was relayed via social media.
The public reported golf ball sized hail 1 mile east of Richland Center.
A CoCoRaHS observer reported ping pong ball sized hail 3 miles north-northwest of Burton.
The public reported golf ball sized hail 3 miles west of Platteville.
The public reported 2 inch diameter hail 1 mile west-northwest of Platteville. The report was relayed via social media.
The public reported tennis ball sized hail 1 mile west of Platteville.
The public reported golf ball sized hail in Platteville. The report was relayed via social media.
The public reported 2 inch diameter hail 2 miles west-northwest of Cornelia.
The public reported baseball sized hail 3 miles west of Platteville.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2025Every state in 2025This day in weather historyWarnings in Wisconsin, April 2025
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1253746, 1253747, 1253748, 1253749, 1253753, 1253756, 1253750, 1253752, 1253754.