After a period of below normal rainfall for much of August and September, severe drought conditions returned in late September to the southern sections of Grant County. These drought conditions continued into October.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. 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.
After a period of below normal rainfall for much of August and September, severe drought conditions returned in late September to the southern sections of Grant County. These drought conditions continued into October.
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 28, 4:32 AM CST, 1 hour 28 minutes earlier.
Area Forecast Discussion National Weather Service La Crosse WI 532 AM CDT Tue Sep 28 2021 .SHORT TERM...(Today and tonight) Issued at 304 AM CDT Tue Sep 28 2021 An amplifying upper ridge over the nation's midsection will slowly slide eastward today with the accompanying surface high centered over the Upper Great Lakes. Light southeasterly return flow will develop this morning along with weak warm air advection. The core of cooler 850mb temperatures associated with the surface high will slowly retreat eastward so should be another warm day across the area, at least fairly similar to yesterday as 850mb temps climb to around 19C. Temperatures have been slightly overachieving lately in this pattern with sunny skies, so leaned toward warm end of guidance with highs in the 70s to lower 80s. The upper ridge axis crosses the Upper Mississippi Valley tonight. Similar to early this morning, looks like winds just above the surface will remain breezy overnight, limiting overall potential for valley fog despite clear skies and light surface winds. Low temperatures will be a tad warmer, generally ranging from mid 40s to mid 50s. .LONG TERM...(Wednesday through Monday) Issued at 304 AM CDT Tue Sep 28 2021 Wednesday still looks to be the overall warmest day as 500mb heights jump above 5840m before the anomalous upper ridge begins to slowly depart. A deep longwave trough spanning the western CONUS will begin to fall apart as it crosses the Rockies heading into Thursday. This will lead to a slow breakdown of the ridge, especially as a pronounced shortwave lifts into our area toward Thursday afternoon. Limited moisture initially looks to keep the forecast area solidly dry now until this feature arrives, with PWATs slowly climbing above 1 inch west of the Mississippi River. Looks like a little instability comes into play, so a decent setup for showers and perhaps a few non-severe storms through Thursday night, mainly near and west of the river. Upper flow pattern quickly turns messy and convoluted heading into the weekend as the upstream longwave trough falls apart, introducing a split flow regime with an unorganized conglomeration of shortwaves and cutoff lows. Definitely looking like a more unsettled pattern for the Upper Mississippi Valley, but a low- predictability pattern to say the least given little agreement among various models that far out. Blended approach is the way to go, and NBM yields several days of 20 to occasionally 40 percent rain chances for Friday through Monday. Temperatures look to slowly cool through the extended period with highs in the 70s through Saturday, dropping into the 60s early next week. && .AVIATION...(For the 12Z TAFS through 12Z Wednesday morning) Issued at 532 AM CDT Tue Sep 28 2021 VFR conditions expected through the TAF period under high pressure with SE winds up to 10 kts. Confidence in fog impacting KLSE early this morning or early Wednesday is low with soundings showing 20-25 kt winds just above the surface during these times. && .ARX WATCHES/WARNINGS/ADVISORIES... WI...None. MN...None. IA...None. && SHORT TERM...Kurz LONG TERM...Kurz AVIATION...JM
Hazardous Weather Outlook National Weather Service La Crosse WI 309 AM CDT Tue Sep 28 2021 IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029- 032>034-041>044-053>055-061-291200- 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- 309 AM CDT Tue Sep 28 2021 This Hazardous Weather Outlook is for portions of southeast Minnesota...northeast Iowa and southwest into central Wisconsin. .DAY ONE...Today and Tonight No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Wednesday through Monday A small chance of thunderstorms returns Thursday afternoon and evening mainly west of the Mississippi River, but severe weather is not expected. .SPOTTER INFORMATION STATEMENT... No action needed. .EMERGENCY MANAGEMENT COORDINATION... No webinar is scheduled. Kurz
The national radar mosaic for the moment the first event began.
1 drought. Local standard time, as filed.
Severe drought conditions returned to the far southern sections of Grant County in late September after a period of below normal rainfall that covered much of August and September. These drought conditions continued into October.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2021Every state in 2021This day in weather historyWarnings in Wisconsin, September 2021
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: 984818.