Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 90, NWS La Crosse, WI
NWS La Crosse, WI issued this severe thunderstorm warning at Aug 24, 2021, 2:59 PM CDT for Clayton County, Fayette County, Iowa. It was in force for 61 min. 1 report 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 24, 2021, 2:59 PM CDT (19:59 UTC)
- Expired
- Aug 24, 2021, 4:00 PM CDT
- In force
- 61 min
- Issued by
- NWS La Crosse, WI
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Clayton County, IA, Fayette County, IA
The radar
The La Crosse radar (KARX), 118 km from the middle of the area, began a volume at 20:02 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 24, 3:26 PM CDT | TSTM WND GST 50 | 1 S Strawberry Point, IA |
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 24, 1:52 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 8.0 hours before the alert went out and 140 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
- 1809 J/kg
- Mixed-layer CIN
- -127 J/kg
- Mixed-layer LCL
- 1284 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 35 m²/s²
- 0-3 km storm-relative helicity
- 9 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
813
WUUS53 KARX 241959
SVRARX
IAC043-065-242100-
/O.NEW.KARX.SV.W.0090.210824T1959Z-210824T2100Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service La Crosse WI
259 PM CDT Tue Aug 24 2021
The National Weather Service in La Crosse has issued a
* Severe Thunderstorm Warning for...
Clayton County in northeastern Iowa...
Southeastern Fayette County in northeastern Iowa...
* Until 400 PM CDT.
* At 259 PM CDT, severe thunderstorms were located along a line
extending from near Fayette to Stanley, moving east 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...
Guttenberg, Elkader, Strawberry Point, Edgewood, Garnavillo,
Arlington, Volga, Wadena, North Buena Vista, Garber, Osterdock,
Elkport, Millville, Camp C.S. Klaus, Mederville, Highways 3 And
187, Turkey River, Bixby State Park, Highway 13 And County C 24 and
Fairview.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4264 9172 4291 9168 4289 9111 4288 9110
4283 9110 4283 9108 4275 9107 4269 9097
4268 9090 4265 9090
TIME...MOT...LOC 1959Z 272DEG 34KT 4290 9177 4265 9178
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Kurz3 follow-up statements
674
WWUS53 KARX 242023
SVSARX
Severe Weather Statement
National Weather Service La Crosse WI
323 PM CDT Tue Aug 24 2021
IAC065-242032-
/O.CAN.KARX.SV.W.0090.000000T0000Z-210824T2100Z/
Fayette IA-
323 PM CDT Tue Aug 24 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN FAYETTE COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 700 PM CDT for
northeastern Iowa...and southwestern Wisconsin.
LAT...LON 4264 9155 4290 9151 4289 9111 4288 9110
4283 9110 4283 9108 4275 9107 4269 9097
4268 9090 4265 9090
TIME...MOT...LOC 2022Z 272DEG 34KT 4288 9148 4264 9150
$$
IAC043-242100-
/O.CON.KARX.SV.W.0090.000000T0000Z-210824T2100Z/
Clayton IA-
323 PM CDT Tue Aug 24 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM CDT
FOR SOUTHERN CLAYTON COUNTY...
At 322 PM CDT, severe thunderstorms were located along a line
extending from near Elkader to near Strawberry Point, moving east at
40 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Guttenberg, Elkader, Strawberry Point, Edgewood, Garnavillo, North
Buena Vista, Garber, Osterdock, Elkport, Millville, Camp C.S. Klaus,
Mederville, Turkey River, Bixby State Park, Highway 13 And County C
24, Fairview, Osborne, Littleport, Lock And Dam 10 and Wood.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately.
&&
LAT...LON 4264 9155 4290 9151 4289 9111 4288 9110
4283 9110 4283 9108 4275 9107 4269 9097
4268 9090 4265 9090
TIME...MOT...LOC 2022Z 272DEG 34KT 4288 9148 4264 9150
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Kurz161
WWUS53 KARX 242039
SVSARX
Severe Weather Statement
National Weather Service La Crosse WI
339 PM CDT Tue Aug 24 2021
IAC043-242100-
/O.CON.KARX.SV.W.0090.000000T0000Z-210824T2100Z/
Clayton IA-
339 PM CDT Tue Aug 24 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM CDT
FOR SOUTHEASTERN CLAYTON COUNTY...
At 338 PM CDT, severe thunderstorms were located along a line
extending from Garnavillo to near Greeley, moving east at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Guttenberg, Edgewood, Garnavillo, Colesburg, North Buena Vista,
Garber, Osterdock, Elkport, Millville, Lock And Dam 10, Camp C.S.
Klaus, Wood, Motor, Communia, Clayton Center, Turkey River, County
Roads X 47 And C 7 X, Bixby State Park, Fairview and Littleport.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4264 9141 4289 9135 4289 9111 4288 9110
4283 9110 4283 9108 4275 9107 4269 9097
4268 9090 4265 9090
TIME...MOT...LOC 2038Z 272DEG 34KT 4287 9127 4263 9129
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Kurz330
WWUS53 KARX 242054
SVSARX
Severe Weather Statement
National Weather Service La Crosse WI
354 PM CDT Tue Aug 24 2021
IAC043-242103-
/O.EXP.KARX.SV.W.0090.000000T0000Z-210824T2100Z/
Clayton IA-
354 PM CDT Tue Aug 24 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CLAYTON COUNTY
WILL EXPIRE AT 400 PM CDT...
The storms which prompted the warning are weakening below severe
limits, and no longer expected to pose an immediate threat to life
or property. Therefore, the warning will be allowed to expire.
A Severe Thunderstorm Watch remains in effect until 700 PM CDT for
northeastern Iowa...and southwestern Wisconsin.
LAT...LON 4264 9141 4289 9135 4289 9111 4288 9110
4283 9110 4283 9108 4275 9107 4269 9097
4268 9090 4265 9090
TIME...MOT...LOC 2053Z 272DEG 34KT 4287 9109 4263 9111
$$
KurzThe office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 24, 12:35 PM CDT | Special Weather Statement | ARX | Mitchell | 55 min |
| Aug 24, 12:38 PM CDT | Special Weather Statement | ARX | Floyd | 67 min |
| Aug 24, 1:29 PM CDT | Special Weather Statement | ARX | Howard, Mitchell | 46 min |
| Aug 24, 1:43 PM CDT | Severe Thunderstorm Warning | ARX | Chickasaw, Floyd | 47 min |
| Aug 24, 1:48 PM CDT | Special Weather Statement | ARX | Chickasaw | 27 min |
| Aug 24, 2:15 PM CDT | Severe Thunderstorm Warning | ARX | Chickasaw, Fayette | 60 min |
| Aug 24, 3:12 PM CDT | Special Weather Statement | ARX | Fayette | 18 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.