During the evening hours on June 19th, a couple of severe storms produced large hail, damaging wind gusts and two brief tornadoes. One of these storms trekked through Trempealeau County where it produced golf ball sized hail in Osseo as well as a weak EF-0 tornado which resulted in minor damage.
Every event with a place to put it. Tap one for its entry below.
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.
During the evening hours on June 19th, a couple of severe storms produced large hail, damaging wind gusts and two brief tornadoes. One of these storms trekked through Trempealeau County where it produced golf ball sized hail in Osseo as well as a weak EF-0 tornado which resulted in minor damage. An additional tornado was documented in Jackson County, but no damage was verified which resulted in an EF-U rating.
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 Jun 19, 5:25 PM CST, 20 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service La Crosse WI 625 PM CDT Fri Jun 19 2026 .KEY MESSAGES... - Increasing likelihood (60-80%) for storms this afternoon- evening. A few stronger storms possible mainly north of I-90, with isolated severe hail/winds (<15% chance). - Isolated showers may impact Taylor and northern Clark counties Saturday afternoon (20% chance). - Rain potential on Sunday increases heading south from I-90 (30-60%), highest just south of our forecast area. && .DISCUSSION... Issued at 1251 PM CDT Fri Jun 19 2026 Scattered storms this afternoon, a few strong to possibly severe Scattered showers and storms will be the story for this afternoon and evening ahead of an approaching upper level shortwave advancing into northern Minnesota. Dewpoints are in the low to mid 50s west of the Mississippi River and in the mid to upper 40s east, but there will be a slight uptick in moisture transport from the west this afternoon ahead of the shortwave. Main question is how much instability we can build this afternoon with incoming decaying midday showers and associated clouds. However, there's been a large portion of central/western Minnesota under few clouds that has seen strong insolation through the morning, and RAP mesoanalysis suggests this growing pool of instability will creep eastward through late afternoon with rather steep low and mid level lapse rates. RAP suggests potentially 1000-1500 J/kg SBCAPE north of I-90 (likely a bit high due to over-mixing), though HREF mean SBCAPE is more on the order of 750-1000 J/kg. Regardless, there will be ample instability, especially north of I-90. Deep layer bulk shear profiles will be robust with 0-6km values on the order of 30-60+ knots everywhere except maybe Taylor and northern Clark counties. Hodographs are somewhat messy but generally straight, suggesting potential for some splitting storms. Certainly favorable dynamics for some supercell structures, but forecast soundings only show deeper CAPE profiles for a brief window of 2-3 hours depending on location so storms will probably be more low-topped. Hail is likely to be the main hazard and should mostly be small, but any stronger/deeper/rotating updrafts could potentially grow isolated severe hail to around quarter size or slightly larger. DCAPE is marginal at best, so not expecting much of a severe wind threat but can't rule it out entirely. Activity will exit our area by late evening. Isolated showers in north-central Wisconsin Saturday afternoon In northwest flow on Saturday, steep 0-3km lapse rates will promote marginal afternoon instability. CAMs have been coming into agreement on the potential for diurnal showers popping up over northern Wisconsin heading into the afternoon. So have added small PoPs (20%) to Taylor into northern Clark counties to account for this, fizzling out toward sunset. Sunday rain chances will be highest just to our south Continuing to monitor Sunday's system and accompanying rain potential. A developing lee cyclone will rapidly advance from Kansas into MO/IA/IL with favorable upper dynamics. Strong low level moisture transport from the Gulf will feed into this system as it passes by to our south. There is wide north-to-south spread among ensemble guidance as to this surface low's track, but all GEFS/GEPS/ENS members keep it south of Wisconsin along with the heaviest rain. There remains low confidence in whether northeast Iowa and southwest Wisconsin will be brushed by some of the wrap around rainfall, if they will miss out entirely, or if the rain advances even a bit further north. Recent ensemble mean trends all exhibit slight north-to-south fluctuations that keep the forecast a bit muddled. So will continue to run with NBM PoPs for now which still paint a broad brushed 30-40% all the way north to I-90 with 60% in our far south. Seasonal into next week Not seeing any big pattern shifts or temperature swings further out in the extended period. Tuesday looks to bring the next substantial chance (70%) for rain as an upper wave drops through in northwest flow aloft. && .AVIATION /00Z TAFS THROUGH 00Z SUNDAY/... Issued at 623 PM CDT Fri Jun 19 2026 Showers and storms continue moving through the region this evening as an area of low pressure shifts eastward across northern Wisconsin. These showers/storms are expected to mainly impact areas along and north of I-90, bringing MVFR/IFR visibility and MVFR ceilings, before moving out of the area by 05z. Behind them, VFR conditions are expected, continuing through the overnight and into Saturday morning for most, although those north of I-94 have the potential to see MVFR ceilings develop through mid Saturday morning (40-60% per the 19.18z REFS). Gusty southwest winds continue over the next few hours, generally 20-30KT, before diminishing to less than 10KT overnight and veering to the northwest Saturday morning. && .ARX WATCHES/WARNINGS/ADVISORIES... WI...None. MN...None. IA...None. && DISCUSSION...Kurz AVIATION...Falkinham
Hazardous Weather Outlook National Weather Service La Crosse WI 101 PM CDT Fri Jun 19 2026 IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029- 032>034-041>044-053>055-061-201200- 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- 101 PM CDT Fri Jun 19 2026 This Hazardous Weather Outlook is for portions of southeast Minnesota...northeast Iowa and southwest into central Wisconsin. .DAY ONE...This Afternoon and Tonight A few stronger storms will be possible this afternoon and evening with isolated large hail and gusty winds. .DAYS TWO THROUGH SEVEN...Saturday through Thursday The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated this afternoon. .EMERGENCY MANAGEMENT COORDINATION... No webinar is scheduled. Kurz
Special Weather Statement
National Weather Service La Crosse WI
333 PM CDT Fri Jun 19 2026
MNZ096-192100-
Houston MN-
333 PM CDT Fri Jun 19 2026
...A STRONG THUNDERSTORM WILL IMPACT SOUTHEASTERN HOUSTON COUNTY
THROUGH 400 PM CDT...
At 332 PM CDT, Doppler radar was tracking a strong thunderstorm over
Caledonia, moving east at 40 mph.
HAZARD...Wind gusts up to 40 mph and half inch hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.
This strong thunderstorm will be near...
Brownsville around 350 PM CDT.
Other locations impacted by this storm include Reno, County Roads 3
And 24, Willington Grove, Freeburg, County 5 And Peyton Road,
Wilmington, Lock And Dam 8, County 14 And White Tail Road, Dun Romin
Park Campground, and Eitzen.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4361 9161 4371 9127 4365 9127 4364 9126
4363 9127 4361 9127 4358 9123 4356 9123
4354 9125 4352 9122 4350 9122 4350 9161
TIME...MOT...LOC 2032Z 259DEG 34KT 4360 9152
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH
NaylorThe La Crosse radar (KARX), 84 km away, was scanning. The volume nearest the first event began at 23:43 UTC.
2 hail, 2 tornado, 2 thunderstorm wind. Local standard time, as filed.
Broadcast media reported golf ball sized hail in Osseo.
A trained spotter reported quarter sized hail 3 miles east-northeast of Osseo.
This brief, weak and narrow tornado began just west of Osseo where it touched down at Merchants Baseball Field off US Highway 10 where it destroyed a storage garage and caused tree damage. The tornado caused additional damage off W 5th Street near Spruce Road where a couple sheds, trees, and a power pole were damaged just prior to the tornado dissipating.
Photo evidence of a very short-lived tornado lofting dust underneath a funnel cloud was correlated with a rotational signature on radar near Merrillan.
Emergency management reported trees and power lines down 1 mile southwest of Waumandee.
Emergency management reported a tree down on Highway 37 in Tell.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2026Every state in 2026This day in weather historyThe tornado archive for Wisconsin, 2026Warnings in Wisconsin, June 2026
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: 1355068, 1355067, 1355071, 1355077, 1355069, 1355070.