Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 73, NWS La Crosse, WI
NWS La Crosse, WI issued this severe thunderstorm warning at Aug 10, 2021, 2:10 PM CDT for Chickasaw County, Fayette County, Winneshiek County, Iowa. It was in force for 50 min. 5 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 10, 2021, 2:10 PM CDT (19:10 UTC)
- Expired
- Aug 10, 2021, 3:00 PM CDT
- In force
- 50 min
- Issued by
- NWS La Crosse, WI
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Chickasaw County, IA, Fayette County, IA, Winneshiek County, IA
The radar
The La Crosse radar (KARX), 128 km from the middle of the area, began a volume at 19:09 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 10, 2:49 PM CDT | TSTM WND GST 45 | Fayette, IA | NUMEROUS LARGE BRANCHES BLOWN DOWN. |
| Aug 10, 2:50 PM CDT | TSTM WND DMG | Fayette, IA | SMALL SHED ROLLED. SOME CORN AND BEAN FLATTENED. |
| Aug 10, 2:55 PM CDT | TSTM WND GST 39 | 3 W Oelwein, IA | AWOS STATION KOLZ OELWEIN MUNICIPAL AIRPORT. |
| Aug 10, 3:02 PM CDT | TSTM WND DMG | 1 S West Union, IA | NUMEROUS 2 TO 8 INCH DIAMETER BRANCHES BLOWN DOWN. |
| Aug 10, 3:03 PM CDT | TSTM WND DMG | West Union, IA | POWER LINES BLOWN DOWN. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 10, 2:08 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 7.2 hours before the alert went out and 191 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 3755 J/kg
- Mixed-layer CIN
- -67 J/kg
- Mixed-layer LCL
- 819 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- -37 m²/s²
- 0-3 km storm-relative helicity
- 4 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
255
WUUS53 KARX 101910
SVRARX
IAC037-065-191-102000-
/O.NEW.KARX.SV.W.0073.210810T1910Z-210810T2000Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service La Crosse WI
210 PM CDT Tue Aug 10 2021
The National Weather Service in La Crosse has issued a
* Severe Thunderstorm Warning for...
Fayette County in northeastern Iowa...
Southwestern Winneshiek County in northeastern Iowa...
Chickasaw County in northeastern Iowa...
* Until 300 PM CDT.
* At 210 PM CDT, a severe thunderstorm was located near Tripoli, or
12 miles northeast of Waverly, moving northeast at 40 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Locations impacted include...
Oelwein, New Hampton, West Union, Fayette, Fairbank, Calmar,
Fredericksburg, Maynard, Hawkeye, Lawler, Fort Atkinson, Waucoma,
Stanley, Jerico, Westgate, St. Lucas, Randalia, Jackson Junction,
Donnan and Festina.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4264 9208 4291 9208 4291 9252 4321 9230
4319 9183 4264 9174
TIME...MOT...LOC 1910Z 236DEG 36KT 4287 9232
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Skow3 follow-up statements
590
WWUS53 KARX 101913
SVSARX
Severe Weather Statement
National Weather Service La Crosse WI
213 PM CDT Tue Aug 10 2021
IAC037-065-191-102000-
/O.CON.KARX.SV.W.0073.000000T0000Z-210810T2000Z/
Fayette IA-Winneshiek IA-Chickasaw IA-
213 PM CDT Tue Aug 10 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM CDT
FOR FAYETTE...SOUTHWESTERN WINNESHIEK AND CHICKASAW COUNTIES...
At 212 PM CDT, a severe thunderstorm was located near Tripoli, or 12
miles south of New Hampton, moving northeast at 40 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Trained weather spotters. At 2:08pm, quarter size hail was
reported near Frederika.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Oelwein, New Hampton, West Union, Fayette, Fairbank, Calmar,
Fredericksburg, Maynard, Hawkeye, Lawler, Fort Atkinson, Waucoma,
Stanley, Jerico, Westgate, St. Lucas, Randalia, Jackson Junction,
Donnan and Festina.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4264 9208 4291 9208 4291 9252 4321 9230
4319 9183 4264 9174
TIME...MOT...LOC 1912Z 236DEG 36KT 4289 9229
HAIL THREAT...OBSERVED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Skow181
WWUS53 KARX 101929
SVSARX
Severe Weather Statement
National Weather Service La Crosse WI
229 PM CDT Tue Aug 10 2021
IAC037-065-191-102000-
/O.CON.KARX.SV.W.0073.000000T0000Z-210810T2000Z/
Fayette IA-Winneshiek IA-Chickasaw IA-
229 PM CDT Tue Aug 10 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM CDT
FOR FAYETTE...SOUTHWESTERN WINNESHIEK AND EASTERN CHICKASAW
COUNTIES...
At 229 PM CDT, severe thunderstorms were located along a line
extending from near Lawler to near Fairbank, moving northeast at 40
mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Trained weather spotters.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Oelwein, West Union, Fayette, Fairbank, Calmar, Fredericksburg,
Maynard, Hawkeye, Lawler, Fort Atkinson, Waucoma, Stanley, Westgate,
St. Lucas, Randalia, Jackson Junction, Donnan, Festina, Eldorado and
Lake Meyer County Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4264 9208 4291 9208 4291 9236 4321 9221
4319 9183 4264 9174
TIME...MOT...LOC 1929Z 246DEG 35KT 4302 9216 4267 9211
HAIL THREAT...OBSERVED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Skow701
WWUS53 KARX 101948
SVSARX
Severe Weather Statement
National Weather Service La Crosse WI
248 PM CDT Tue Aug 10 2021
IAC037-101957-
/O.CAN.KARX.SV.W.0073.000000T0000Z-210810T2000Z/
Chickasaw IA-
248 PM CDT Tue Aug 10 2021
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN CHICKASAW COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 800 PM CDT for
northeastern Iowa.
LAT...LON 4264 9208 4308 9208 4319 9183 4264 9174
TIME...MOT...LOC 1947Z 238DEG 33KT 4309 9194 4264 9204
$$
IAC065-191-102000-
/O.CON.KARX.SV.W.0073.000000T0000Z-210810T2000Z/
Fayette IA-Winneshiek IA-
248 PM CDT Tue Aug 10 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM CDT
FOR FAYETTE AND SOUTH CENTRAL WINNESHIEK COUNTIES...
At 247 PM CDT, severe thunderstorms were located along a line
extending from near Fort Atkinson to Fairbank, moving east-northeast
at 40 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Oelwein, West Union, Fayette, Fairbank, Calmar, Maynard, Hawkeye,
Fort Atkinson, Waucoma, Stanley, Westgate, St. Lucas, Randalia,
Jackson Junction, Donnan, Festina, Eldorado, Waucoma Campground,
County Road W 33 And 187 and Highway 93 And County W 14.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4264 9208 4308 9208 4319 9183 4264 9174
TIME...MOT...LOC 1947Z 238DEG 33KT 4309 9194 4264 9204
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
SkowThe office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 2:26 PM CDT | Heat Advisory | ARX | Clayton | 27 hr |
| Aug 10, 2:43 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee, Clayton, Fayette, Winneshiek | 62 min |
| Aug 10, 3:23 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee, Clayton | 52 min |
| Aug 10, 3:56 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee | 64 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2021Every severe thunderstorm warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.