A line of thunderstorms swept across northeast Iowa during the early morning hours of September 3rd. These storms produced some isolated wind damage across Allamakee County.
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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 line of thunderstorms swept across northeast Iowa during the early morning hours of September 3rd. These storms produced some isolated wind damage across Allamakee County. Trees were blown down across a road north of Harpers Ferry.
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 3, 12:58 AM CST, 45 minutes earlier.
Area Forecast Discussion National Weather Service La Crosse WI 158 AM CDT Tue Sep 3 2019 .SHORT TERM...(Today and tonight) Issued at 158 AM CDT Tue Sep 3 2019 Short term focus is on the long-lived convective system tracking quickly across the area early this morning associated with a potent shortwave trough approaching northern MN early today. This system will continue to trek east of the area along the gradient in instability over the next few hours. Still watching the southern end of the line for strong or a locally severe storm, but we have allowed the severe thunderstorm watch to expire as scheduled. Additional scattered storms are developing on the low- level moisture transport axis early this morning. These will gradually shift east through sunrise. Even into the daylight hours a few showers/storms will be possible until the cold front clears the area to the southeast. Drier air will work in through the day today behind the front with deep mixing/subsidence/cold advection promoting gusty northwest winds up to 25 to 35 mph. Another warm day is expected with highs in the mid 70s to mid 80s. A cu/stratocu field will develop southeastward this afternoon as a secondary shortwave trough rotates through, most widespread across northern MN/WI. Otherwise, high pressure will build in for tonight with much cooler lows in the 40s to low 50s. .LONG TERM...(Wednesday through Monday) Issued at 158 AM CDT Tue Sep 3 2019 Surface ridge axis will drift across the area on Wednesday with seasonably cool temps in the mid 60s to low 70s. A weak shortwave trough in northwest flow may bring a few showers/storms to the area on Thursday with more seasonable high temps mainly in the 70s for late this work week. Another shortwave trough may bring some showers to parts of the area through the weekend with below average temps expected. Some signs point to a warming trend into next week as the northwest upper flow pattern becomes more zonal or southwesterly. && .AVIATION...(For the 06Z TAFS through 06Z Tuesday night) Issued at 1107 PM CDT Mon Sep 2 2019 The line of convection has sped up as it has approached the area this evening and now looks like it will move past both airports very early during the overnight hours. In fact, it could be past KRST by 03.06Z, but still close enough to include some mention. It should then move past KLSE by about 03.08Z or so. Expecting MVFR conditions as the line goes through and for a while behind it before conditions improve back to VFR by about the middle of the morning. Gusty southwest winds ahead of an approaching cold front will go around to the west and continue to be gusty through the afternoon. && .ARX WATCHES/WARNINGS/ADVISORIES... WI...None. MN...None. IA...None. && SHORT TERM...JM LONG TERM...JM AVIATION...04
Hazardous Weather Outlook National Weather Service La Crosse WI 403 PM CDT Mon Sep 2 2019 IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029- 032>034-041>044-053>055-061-031200- 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- 403 PM CDT Mon Sep 2 2019 This Hazardous Weather Outlook is for parts of southeast Minnesota...northeast Iowa and southwest into central Wisconsin. .DAY ONE...Tonight Severe thunderstorms are looking likely after midnight with the greatest threat generally along and north of Interstate 90. Hazards include damaging winds, large hail, and possibly heavy rain which could lead to localized flooding. Main threat time looks to be between 1 AM and 6 AM. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Storms may be on going early Tuesday morning. A few could be severe with damaging winds and locally heavy rain. Thunderstorms a possible again on Thursday. .SPOTTER INFORMATION STATEMENT... Due to the storms impacting the area overnight, widespread spotter activation is not expected. Reports of wind damage and heavy rainfall would be appreciated. .EMERGENCY MANAGEMENT COORDINATION... No webinar is scheduled.
Special Weather Statement
National Weather Service La Crosse WI
1225 AM CDT Tue Sep 3 2019
MNZ086-087-094-095-030630-
Olmsted-Dodge-Fillmore-Mower-
1225 AM CDT Tue Sep 3 2019
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHERN OLMSTED...
MOWER...SOUTHERN DODGE AND WESTERN FILLMORE COUNTIES...
At 1224 AM CDT, radar indicated strong thunderstorms were located
along a line extending from near Eyota to near Stewartville to near
Blooming Prairie. Movement was southeast at 35 mph.
Winds in excess of 40 mph and nickel size hail are possible with
these storms.
Locations impacted include...
Austin, Preston, Stewartville, Chatfield, Spring Valley, Grand
Meadow, Brownsdale, Lyle, Fillmore, Lansing, Pleasant Grove and
Washington.
LAT...LON 4393 9304 4394 9208 4385 9208 4385 9207
4350 9208 4350 9305
TIME...MOT...LOC 0524Z 326DEG 30KT 4399 9231 4385 9257 4385 9301
RieckPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LA CROSSE WI
1226 AM CDT TUE SEP 3 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1216 AM HAIL KASSON 44.03N 92.75W
09/03/2019 E0.88 INCH DODGE MN PUBLIC
REPORTED NICKEL SIZE HAIL.
&&PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LA CROSSE WI
1231 AM CDT TUE SEP 3 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1223 AM TSTM WND GST ROCHESTER AIRPORT 43.90N 92.49W
09/03/2019 M59 MPH OLMSTED MN ASOS
&&PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LA CROSSE WI
1246 AM CDT TUE SEP 3 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1240 AM HAIL STEWARTVILLE 43.86N 92.49W
09/03/2019 E0.75 INCH OLMSTED MN PUBLIC
PENNY SIZED HAIL. REPORT VIA KTTC.
&&Special Weather Statement
National Weather Service La Crosse WI
1247 AM CDT Tue Sep 3 2019
MNZ087-095-030645-
Olmsted-Fillmore-
1247 AM CDT Tue Sep 3 2019
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHEASTERN OLMSTED
AND FILLMORE COUNTIES...
At 1246 AM CDT, radar indicated strong thunderstorms were located
along a line extending from 6 miles southeast of St. Charles to near
Wykoff to near Grand Meadow. Movement was southeast at 45 mph.
Wind gusts of 50 to 55 mph and penny size hail are possible with
these storms.
Locations impacted include...
Preston, Stewartville, Chatfield, Spring Valley, Rushford, Harmony,
Lanesboro, Fillmore,Pleasant Grove, and Newburg.
These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
LAT...LON 4386 9247 4389 9228 4394 9208 4385 9208
4385 9177 4384 9173 4350 9173 4350 9245
4383 9245 4384 9247
TIME...MOT...LOC 0546Z 312DEG 40KT 4389 9200 4374 9221 4376 9249
RieckSpecial Weather Statement
National Weather Service La Crosse WI
121 AM CDT Tue Sep 3 2019
IAZ010-011-MNZ096-030715-
Winneshiek-Allamakee-Houston-
121 AM CDT Tue Sep 3 2019
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTHERN ALLAMAKEE...
NORTHEASTERN WINNESHIEK AND HOUSTON COUNTIES...
At 120 AM CDT, radar indicated strong thunderstorms were located
along a line extending from Houston to near Mabel to Harmony.
Movement was southeast at 40 mph.
Wind gusts of 50 to 55 mph and half inch hail are possible with these
storms.
These storms will be near...
Houston around 125 AM CDT.
Caledonia and Spring Grove around 130 AM CDT.
Hokah around 135 AM CDT.
Brownsville around 140 AM CDT.
Other locations impacted by these storms include Hanover, Riceford,
Red Barn Campground, Locust and Sattre.
To report severe weather, contact your nearest law enforcement
agency. They can relay your report to the National Weather Service
office in La Crosse.
LAT...LON 4350 9207 4350 9173 4372 9173 4385 9158
4385 9129 4378 9124 4361 9127 4358 9123
4354 9125 4352 9122 4345 9123 4341 9120
4337 9122 4332 9112 4332 9175
TIME...MOT...LOC 0620Z 301DEG 36KT 4378 9156 4356 9181 4353 9202
RieckThe La Crosse radar (KARX), 66 km away, was scanning. The volume nearest the first event began at 07:41 UTC.
1 thunderstorm wind. Local standard time, as filed.
Trees were blown down across a road north of Harpers Ferry.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2019Every state in 2019This day in weather historyWarnings in Iowa, September 2019
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: 853031.