A cluster of storms moved into portions of northeast Iowa during the late evening hours on September 22nd associated with a slowly moving frontal boundary. As these storms intensified, they produced hail up to quarter sized in portions of northeast Iowa.
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.
A cluster of storms moved into portions of northeast Iowa during the late evening hours on September 22nd associated with a slowly moving frontal boundary. As these storms intensified, they produced hail up to quarter sized in portions of northeast Iowa.
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 Sep 22, 12:45 PM CST, 2 hours 50 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service La Crosse WI 145 PM CDT Mon Sep 22 2025 .KEY MESSAGES... - Showers and storms today will slowly shift southward into the evening. Some strong storms and an isolated severe storm (large hail) are possible. - Low rain chances across SW Wisconsin Tuesday through Thursday. Otherwise dry conditions, seasonable temperatures, and overall benign pattern to return. && .DISCUSSION... Issued at 136 PM CDT Mon Sep 22 2025 Strong Storms Possible This Afternoon/Evening Convection has continued through the morning hours generally along the I-90 corridor with continued back building from the east/west oriented 850 mb moisture transport vector. Hi- resolution models have done a poor job at handling this convection with most 22.12Z guidance completely disregarding this batch of convection after 15Z. As such, this has made discerning this afternoon and evening's forecast all the more challenging. An area of convergence around a weak boundary is currently located across North Dodge/Olmsted counties. Hi- resolution models are attempting to develop convection along this boundary by early/mid afternoon as the upper level shortwave trough continues to trek across the Upper Midwest. The problem with this outcome lies in the fact that storms are still ongoing across portions of SE Minnesota and SW Wisconsin. This is limiting destabilization given the still present cloud cover and abundance of rain cooled air across the region. 22.12Z RAP/HRRR soundings were anticipating nearly 1500 J/kg uncapped MLCAPE by this afternoon across much of our area south of the front, something that has not come to fruition as of yet. There is still time to destabilize and with convergence increasing along the boundary, we still expect storms to fire later this afternoon. The area with the best chance of seeing some strong to potentially severe storms would be across Northeastern Iowa, where SPC has their Day 1 Slight Risk (Level 2/5) for severe weather. Outside of NE Iowa, much of the area south of I-94 is included in the Day 1 Marginal Risk (Level 1/5). The main threat would be hail given steadily increasing (but still marginal) mid level lapse rates and cool temperatures aloft. The hazard looks to evolve into more of a damaging wind threat with time as storms grow upscale into more of a cluster. Similar to the past week or so, individual storms are expected to be rather pulsey in nature due to continued limited shear (~20-25 kts) as the upper low/trough pivot northeastward, away from the low level warm sector. As the boundary sags south through the evening hours, rain chances will gradually end from north to south. With the abundance of rainfall and dew point depressions less than 5 degrees, fog is expected to develop across much of the area overnight and into tomorrow morning. Dense fog headlines may be needed down the line but have held off for now given reasonable uncertainty in how degraded visibilities will become this far south. Benign Pattern to Return, Low Rain Chances Further South As the aforementioned upper low/trough pivot northeast, another trough is currently digging into the Intermountain West/North- Central Rockies. Mid-range models are anticipating a cutoff upper low to form from this in the Central Rockies with its trough axis extending all the way through the Upper Midwest and into Southern Ontario in conjunction with the departing Great Lakes trough. How this evolves is slightly uncertain but current guidance is leaning towards this low moving through the Mid- Mississippi Valley and into the Ohio River Valley through mid- week. With this track, much of our area will stay dry with only some low end slight-chance PoPs across far SW Wisconsin. Should the low track a bit further north, we could see some increased PoPs along and south of I-90 but showers would likely be on the light side as we will be on the far northern edge of the rain shield. So after a week or two of scattered thunderstorm chances every day, we finally look to dry out across the Coulee Region from mid-week onwards. Temperatures should be pleasant and near normal in the 70s each day, apart from Friday where highs could sneak into the lower 80s in the river valleys. Long wave ridging is expected to fill in for the weekend, keeping conditions dry and pleasant for the early portions of astronomical fall. && .AVIATION /18Z TAFS THROUGH 18Z TUESDAY/... Issued at 1238 PM CDT Mon Sep 22 2025 Scattered showers and storms will continue along and south of Interstate 90 into this evening. A few of these storms may become strong to severe. The main threats will hail and damaging winds. The wind threat will be more in northeast Iowa and southwest Wisconsin. Fog will reduce visibilities into the IFR/MVFR range overnight tonight and early Tuesday morning. As the fog lifts, IFR/MVFR ceilings will persist through Tuesday morning. && .ARX WATCHES/WARNINGS/ADVISORIES... WI...None. MN...None. IA...None. && DISCUSSION...Barendse AVIATION...Boyne
Hazardous Weather Outlook National Weather Service La Crosse WI 420 AM CDT Mon Sep 22 2025 IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029- 032>034-041>044-053>055-061-231200- 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- 420 AM CDT Mon Sep 22 2025 This Hazardous Weather Outlook is for portions of southeast Minnesota...northeast Iowa and southwest into central Wisconsin. .DAY ONE...Today and Tonight Periodic thunderstorms are expected today and into the evening. Some storms may be strong, with a risk of hail to penny to quarter size (2-5% chance). If storms repeat for several hours over the same location with heavy rain (10% chance), there is an increased risk of flooding. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Rainfall or hail reports are always appreciated. .EMERGENCY MANAGEMENT COORDINATION... No webinar is scheduled. Baumgardt
Special Weather Statement
National Weather Service La Crosse WI
1104 AM CDT Mon Sep 22 2025
IAZ010-011-MNZ095-096-WIZ053-221630-
Winneshiek IA-Allamakee IA-Fillmore MN-Houston MN-Vernon WI-
1104 AM CDT Mon Sep 22 2025
...A STRONG THUNDERSTORM WILL IMPACT NORTHWESTERN ALLAMAKEE...
NORTHEASTERN WINNESHIEK...SOUTHERN HOUSTON...SOUTHEASTERN FILLMORE
AND SOUTHWESTERN VERNON COUNTIES THROUGH 1130 AM CDT...
At 1103 AM CDT, Doppler radar was tracking strong thunderstorms in
western Houston County moving southeast at 25 mph.
HAZARD...Penny size hail.
SOURCE...Radar indicated.
IMPACT...Minor hail damage to vegetation is possible.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4351 9181 4377 9165 4349 9110 4342 9115
4342 9121 4339 9120 4337 9122 4335 9121
4326 9128
TIME...MOT...LOC 1603Z 300DEG 23KT 4357 9165
MAX HAIL SIZE...0.75 IN
MAX WIND GUST...<30 MPH
JSBPreliminary Local Storm Report
National Weather Service La Crosse WI
1246 PM CDT Mon Sep 22 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0900 AM Rain 6 W Goodrich 45.14N 90.20W
09/22/2025 M0.52 Inch Taylor WI Public
&&
JSBPreliminary Local Storm Report
National Weather Service La Crosse WI
302 PM CDT Mon Sep 22 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0239 PM Hail Victory 43.49N 91.21W
09/22/2025 M0.75 Inch Vernon WI Emergency Mngr
&&
NRFThe La Crosse radar (KARX), 151 km away, was scanning. The volume nearest the first event began at 21:34 UTC.
2 hail. Local standard time, as filed.
The public reported quarter sized hail 2 miles northwest of Saint Ansgar Airport. The reports were relayed from local media.
The public reported 1 mile south of Waucoma. The report was relayed by media via NWS Chat.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2025Every state in 2025This day in weather historyWarnings in Iowa, September 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: 1289037, 1289038.