Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 101, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 24, 2021, 9:43 AM CDT for Lyon County, Osceola County, Iowa; Nobles County, Minnesota. It was in force for 47 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, 9:43 AM CDT (14:43 UTC)
- Expired
- Aug 24, 2021, 10:30 AM CDT
- In force
- 47 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Lyon County, IA, Osceola County, IA, Nobles County, MN
The radar
The Sioux Falls radar (KFSD), 64 km from the middle of the area, began a volume at 14:43 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, 10:25 AM CDT | HAIL 1 | Little Rock, IA | RECEIVED QUARTER SIZED HAIL, BUT SAID THAT THE ACCUMULATION WAS NOT DEEP. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 2.7 hours before the alert went out and 237 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
- 989 J/kg
- Mixed-layer CIN
- -401 J/kg
- Mixed-layer LCL
- 1868 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 103 m²/s²
- 0-3 km storm-relative helicity
- 129 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
742
WUUS53 KFSD 241443
SVRFSD
IAC119-143-MNC105-241530-
/O.NEW.KFSD.SV.W.0101.210824T1443Z-210824T1530Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
943 AM CDT Tue Aug 24 2021
The National Weather Service in Sioux Falls has issued a
* Severe Thunderstorm Warning for...
Northeastern Lyon County in northwestern Iowa...
Northwestern Osceola County in northwestern Iowa...
South central Nobles County in southwestern Minnesota...
* Until 1030 AM CDT.
* At 943 AM CDT, a severe thunderstorm was located near George, or
near Rock Rapids, moving east at 25 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...
Little Rock and Sibley.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4333 9610 4338 9620 4346 9615 4362 9573
4345 9555
TIME...MOT...LOC 1443Z 251DEG 24KT 4342 9605
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
BP2 follow-up statements
316
WWUS53 KFSD 241506
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
1006 AM CDT Tue Aug 24 2021
IAC119-143-MNC105-241530-
/O.CON.KFSD.SV.W.0101.000000T0000Z-210824T1530Z/
Lyon IA-Osceola IA-Nobles MN-
1006 AM CDT Tue Aug 24 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 AM CDT
FOR NORTHEASTERN LYON...NORTHWESTERN OSCEOLA AND SOUTH CENTRAL NOBLES
COUNTIES...
At 1005 AM CDT, a severe thunderstorm was located near Ellsworth, or
11 miles northeast of Rock Rapids, moving east at 40 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Little Rock.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4339 9583 4347 9612 4362 9573 4345 9555
TIME...MOT...LOC 1505Z 255DEG 34KT 4350 9596
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
BP229
WWUS53 KFSD 241527
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
1027 AM CDT Tue Aug 24 2021
IAC119-143-MNC105-241537-
/O.EXP.KFSD.SV.W.0101.000000T0000Z-210824T1530Z/
Lyon IA-Osceola IA-Nobles MN-
1027 AM CDT Tue Aug 24 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN LYON...
NORTHWESTERN OSCEOLA AND SOUTH CENTRAL NOBLES COUNTIES WILL EXPIRE AT
1030 AM CDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Sioux Falls.
LAT...LON 4339 9583 4347 9612 4362 9573 4345 9555
TIME...MOT...LOC 1527Z 251DEG 24KT 4354 9578
$$
BPThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 24, 3:31 AM CDT | Heat Advisory | FSD | Plymouth, Woodbury | 11 hr |
| Aug 24, 10:44 AM CDT | Severe Thunderstorm Warning | FSD | Dickinson, Osceola | 30 min |
| Aug 24, 8:16 AM CDT | Severe Thunderstorm Warning | FSD | Cottonwood, Murray | 44 min |
| Aug 24, 8:59 AM CDT | Severe Thunderstorm Warning | FSD | Cottonwood, Murray | 61 min |
| Aug 24, 10:00 AM CDT | Severe Thunderstorm Warning | FSD | Cottonwood, Jackson, Nobles, Rock | 45 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2021Severe Thunderstorm Warnings in Minnesota, 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.