During the evening hours on August 10th, a slow moving cluster of storms moved into Clayton County and corresponding heavy rain resulted in a local county road becoming washed out. These storms moved into Grant County in Wisconsin where they caused additional flooding.
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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.
During the evening hours on August 10th, a slow moving cluster of storms moved into Clayton County and corresponding heavy rain resulted in a local county road becoming washed out. These storms moved into Grant County in Wisconsin where they caused additional flooding.
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 Aug 10, 3:34 PM CST, 2 hours 16 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service La Crosse WI 434 PM CDT Sun Aug 10 2025 .KEY MESSAGES... - Showers and storms continue this afternoon, moving eastward this evening. Fog is possible overnight into Monday morning. - Showers/Storms are possible Monday (10-20%) and again Tuesday (15-30%) - Lower rain probabilities and more seasonal temperatures by mid-week. Temperatures begin to warm up by the end of the week. && .DISCUSSION... Issued at 259 PM CDT Sun Aug 10 2025 This Afternoon and Tonight An MCV has been spinning northeastward across Iowa through much of the day, which has made its way into the Upper Mississippi River Valley. Forcing associated with this feature has sparked some additional showers across the region this afternoon. The environment has largely struggled to recover from this mornings convection, with the highest instability (500-1500 J/kg) residing over far southwestern Wisconsin westward into northeast Iowa. As such, not expecting much of a lightning threat with the bulk of the showers although can't rule out a few rumbles of thunder. Areas across northeast Iowa and southwest Wisconsin are most poised to see storms develop this afternoon with additional brief heavy rainfall on an already saturated area (40-70%). As such, some flooding concern continues for areas in northeast Iowa and southwest Wisconsin. Showers/storms are expected to move eastward this evening. As we head into the overnight hours, mid to upper level drying should occur from the northwest allowing for a decrease in cloud cover. Given the additional rainfall from today combined with clearing skies, fog development appears favorable for much of the area into Monday morning. Showers and Storms Monday and Tuesday Monday is expected to be a relatively mundane weather day apart from the morning's fog. Weak surface high pressure slides southeastward, keeping the majority of our area dry through the day. Across the Kansas/Missouri region, an MCV develops and moves northward through the day, bringing low probabilities of showers/storms to southwest Wisconsin and northeast Iowa (10-20%). Confidence is not high regarding Monday's precipitation probabilities as the high pressure could result in the showers/storms staying southeast. However, several shortwave impulses also move through the region so the additional forcing could aid in convective development. CAMs have struggled to agree on a solution regarding the evolution of possible convection on Monday, so have gone with the lower end probabilities for the time being. Predictability increases for Tuesday as global deterministic models are in better agreement regarding an upper level trough pivoting eastward across the Northern Plains and Great Lakes with a surface boundary being dragged southeastward through the region. These features appear to move through the bulk of our area during the morning areas, limiting precipitation potential to areas north of I- 90 until the afternoon where stronger instability and increasing moisture could allow for development towards central Wisconsin. Drier and More Seasonable by Mid-Week A zonal to slight ridging pattern develops in the wake of the upper trough by mid week, bringing a pattern more favorable for drier weather. Temperatures will be more seasonable Wednesday behind the surface boundary, in the upper 70s to low 80s. Temperatures look to increase to the mid to upper 80s by the end of the week. && .AVIATION /18Z TAFS THROUGH 18Z MONDAY/... Issued at 110 PM CDT Sun Aug 10 2025 Showers/storms from this morning have dissipated across the region this afternoon. Additional showers have developed across south-central Minnesota and north-central Iowa and are expected to propagate eastward through the afternoon, although not overly confident in the eventual evolution of them through our region. Greater confidence in additional showers/storms developing in eastern Iowa and moving into far southwestern Wisconsin from 21z-00z. Mist/Fog is expected to develop again tonight into Monday morning given the ample moisture from the rainfall of the past few days. MVFR/IFR visibilities are possible across the region through the morning hours with the fog. && .HYDROLOGY... Issued at 433 PM CDT Sun Aug 10 2025 Additional showers/storms are possible (40-70%) over northeast Iowa into southwest Wisconsin this afternoon. Rain amounts are not expected to be as high as they were this morning (1-2"), but the additional rain on already saturated soils results in flooding concerns. Rivers in the area did respond with the abundant rainfall this morning with several reaching Action Stage. Most rivers are expected to crest soon if they haven't already, but additional rainfall this afternoon could see river rises again. && .ARX WATCHES/WARNINGS/ADVISORIES... WI...Flood Watch until 7 PM CDT this evening for WIZ054-055-061. MN...None. IA...Flood Watch until 7 PM CDT this evening for IAZ029-030. && DISCUSSION...Falkinham AVIATION...Falkinham HYDROLOGY...Falkinham
Hazardous Weather Outlook National Weather Service La Crosse WI 405 AM CDT Sun Aug 10 2025 IAZ008>011-018-019-MNZ079-086>088-094>096-WIZ017-029-032>034- 041>044-053-111200- Mitchell-Howard-Winneshiek-Allamakee-Floyd-Chickasaw-Wabasha- Dodge-Olmsted-Winona-Mower-Fillmore-Houston-Taylor-Clark-Buffalo- Trempealeau-Jackson-La Crosse-Monroe-Juneau-Adams-Vernon- 405 AM CDT Sun Aug 10 2025 This Hazardous Weather Outlook is for portions of southeast Minnesota...northeast Iowa and southwest into central Wisconsin. .DAY ONE...Today and Tonight Scattered storms will be possible today. The main threat will be lightning. .DAYS TWO THROUGH SEVEN...Monday through Saturday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... No action needed. .EMERGENCY MANAGEMENT COORDINATION... No webinar is scheduled. IAZ029-030-WIZ054-055-061-111200- Fayette-Clayton-Crawford-Richland-Grant- 405 AM CDT Sun Aug 10 2025 This Hazardous Weather Outlook is for portions of northeast Iowa and southwest Wisconsin. .DAY ONE...Today and Tonight Flood Watch through today. Storms producing heavy rainfall expected across southwest WI and portions of northeast IA today. If storms repeat over the same locations, rainfall totals of 2 to 4 inches may occur (15-25% chance), with locally higher amounts, which could lead to flash flooding. .DAYS TWO THROUGH SEVEN...Monday through Saturday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... No action needed. .EMERGENCY MANAGEMENT COORDINATION... No webinar is scheduled. Baumgardt
Preliminary Local Storm Report
National Weather Service La Crosse WI
144 PM CDT Sun Aug 10 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0712 AM Flash Flood Bagley 42.90N 91.10W
08/10/2025 Grant WI Emergency Mngr
Debris blocking a railroad bridge resulted
in storm water to overflow into portions of
Bagley and inundate some residences.
&&Preliminary Local Storm Report
National Weather Service La Crosse WI
537 PM CDT Sun Aug 10 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0400 PM Rain Eastman 43.17N 91.02W
08/10/2025 M2.51 Inch Crawford WI Public
&&
JSBPreliminary Local Storm Report
National Weather Service La Crosse WI
538 PM CDT Sun Aug 10 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0430 PM Rain 3 SW Cummingsville 43.85N 92.30W
08/10/2025 M0.20 Inch Olmsted MN Public
&&
JSBSpecial Weather Statement
National Weather Service La Crosse WI
618 PM CDT Sun Aug 10 2025
WIZ061-110000-
Grant WI-
618 PM CDT Sun Aug 10 2025
...STRONG THUNDERSTORMS WILL IMPACT SOUTHERN GRANT COUNTY THROUGH
700 PM CDT...
At 616 PM CDT, Doppler radar was tracking a cluster of strong
thunderstorms over Bankston, or 11 miles west of Dubuque, moving
northeast at 50 mph.
HAZARD...Wind gusts up to 40 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
This strong thunderstorm will be near...
Dickeyville around 635 PM CDT.
Platteville around 645 PM CDT.
Other locations impacted by this storm include Kieler, Lock And Dam
11, Sandy Hook, Louisburg, Platteville Airport, Big Patch, Sinsinawa,
Tennyson, Georgetown, and Cornelia.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Conditions are favorable for the development of weak, brief funnel
clouds.
Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 4254 9064 4256 9066 4257 9066 4259 9069
4263 9070 4264 9073 4265 9078 4281 9043
4251 9042 4251 9064
TIME...MOT...LOC 2316Z 240DEG 44KT 4250 9093
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH
JSBThe La Crosse radar (KARX), 111 km away, was scanning. The volume nearest the first event began at 23:51 UTC.
1 flash flood. Local standard time, as filed.
The public reported a local county road was washed out from flash flooding of Buck Creek roughly 1 mile north of Guttenberg.
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, August 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: 1288856.