Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 79, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 5, 2021, 10:04 PM CDT for 4 counties in South Dakota; Lyon County, Iowa. It was in force for 41 min. 2 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 5, 2021, 10:04 PM CDT (03:04 UTC)
- Expired
- Aug 5, 2021, 10:45 PM CDT
- In force
- 41 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Lyon County, IA, Lincoln County, SD, McCook County, SD, Minnehaha County, SD, Turner County, SD
The radar
The Sioux Falls radar (KFSD), 31 km from the middle of the area, began a volume at 03:08 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 5, 10:20 PM CDT | TSTM WND DMG | 3 E Davis, SD | ROOF DAMAGE TO HOME WITH PORTION OF ROOF MISSING SHINGLES. PICTURE VIA SOCIAL MEDIA AND TIME ESTIMATED VIA RADAR. |
| Aug 5, 10:20 PM CDT | TSTM WND DMG | 3 Ene Davis, SD | STRUCTURAL DAMAGE TO GARAGE WITH BACK WALL BLOWN OUT. PICTURES VIA SOCIAL MEDIA. TIME ESTIMATED VIA RADAR. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 3.1 hours before the alert went out and 204 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
- 835 J/kg
- Mixed-layer CIN
- -42 J/kg
- Mixed-layer LCL
- 1549 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 259 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
033
WUUS53 KFSD 060304
SVRFSD
IAC119-SDC083-087-099-125-060345-
/O.NEW.KFSD.SV.W.0079.210806T0304Z-210806T0345Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
1004 PM CDT Thu Aug 5 2021
The National Weather Service in Sioux Falls has issued a
* Severe Thunderstorm Warning for...
Southwestern Lyon County in northwestern Iowa...
Southwestern Minnehaha County in southeastern South Dakota...
Lincoln County in southeastern South Dakota...
Southeastern McCook County in southeastern South Dakota...
Eastern Turner County in southeastern South Dakota...
* Until 1045 PM CDT.
* At 1003 PM CDT, a severe thunderstorm was located near Tea, or 11
miles southwest of Sioux Falls, moving southeast at 35 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
* This severe thunderstorm will be near...
Lennox around 1015 PM CDT.
Other locations in the path of this severe thunderstorm include
Worthing.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.
&&
LAT...LON 4358 9727 4360 9698 4333 9638 4308 9698
4308 9702
TIME...MOT...LOC 0303Z 322DEG 29KT 4345 9692
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
SSC2 follow-up statements
049
WWUS53 KFSD 060321
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
1021 PM CDT Thu Aug 5 2021
SDC087-099-060331-
/O.CAN.KFSD.SV.W.0079.000000T0000Z-210806T0345Z/
Minnehaha SD-McCook SD-
1021 PM CDT Thu Aug 5 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN MINNEHAHA AND
SOUTHEASTERN MCCOOK COUNTIES IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 4339 9717 4350 9681 4350 9676 4333 9638
4308 9698 4308 9702
TIME...MOT...LOC 0321Z 322DEG 29KT 4333 9679
$$
IAC119-SDC083-125-060345-
/O.CON.KFSD.SV.W.0079.000000T0000Z-210806T0345Z/
Lyon IA-Lincoln SD-Turner SD-
1021 PM CDT Thu Aug 5 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM CDT
FOR SOUTHWESTERN LYON...LINCOLN AND EASTERN TURNER COUNTIES...
At 1021 PM CDT, a severe thunderstorm was located over Worthing, or
10 miles west of Canton, moving southeast at 35 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
This severe thunderstorm will remain over mainly rural areas of
southwestern Lyon, Lincoln and eastern Turner Counties.
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 this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
&&
LAT...LON 4339 9717 4350 9681 4350 9676 4333 9638
4308 9698 4308 9702
TIME...MOT...LOC 0321Z 322DEG 29KT 4333 9679
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
SSC973
WWUS53 KFSD 060337
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
1037 PM CDT Thu Aug 5 2021
IAC119-SDC083-125-060346-
/O.EXP.KFSD.SV.W.0079.000000T0000Z-210806T0345Z/
Lyon IA-Lincoln SD-Turner SD-
1037 PM CDT Thu Aug 5 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN LYON...LINCOLN
AND EASTERN TURNER COUNTIES WILL EXPIRE AT 1045 PM CDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire. However small
hail, gusty winds and heavy rain are still possible with this
thunderstorm.
Remember, a Severe Thunderstorm Warning still remains in effect for
Lincoln County until 4:15 PM.
LAT...LON 4339 9717 4350 9681 4350 9676 4333 9638
4308 9698 4308 9702
TIME...MOT...LOC 0336Z 322DEG 29KT 4323 9669
$$
SSCThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 5, 7:00 PM CDT | Severe Thunderstorm Warning | FSD | Lake, Moody | 45 min |
| Aug 5, 7:28 PM CDT | Severe Thunderstorm Warning | FSD | Brookings, Moody | 32 min |
| Aug 5, 7:44 PM CDT | Severe Thunderstorm Warning | FSD | Moody | 33 min |
| Aug 5, 7:58 PM CDT | Severe Thunderstorm Warning | FSD | Lake, Minnehaha, Moody | 47 min |
| Aug 5, 8:24 PM CDT | Severe Thunderstorm Warning | FSD | Minnehaha, Moody | 51 min |
| Aug 5, 8:57 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Minnehaha | 48 min |
| Aug 5, 9:04 PM CDT | Severe Thunderstorm Warning | FSD | Minnehaha | 28 min |
| Aug 5, 10:36 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Lincoln, Turner, Union | 39 min |
| Aug 5, 11:40 PM CDT | Severe Thunderstorm Warning | FSD | Minnehaha | 50 min |
| Aug 6, 12:10 AM CDT | Severe Thunderstorm Warning | FSD | Union | 35 min |
| Aug 6, 1:06 AM CDT | Severe Thunderstorm Warning | FSD | Lincoln | 39 min |
| Aug 6, 1:36 AM CDT | Severe Thunderstorm Warning | FSD | Union | 24 min |
| Aug 5, 9:31 PM CDT | Severe Thunderstorm Warning | FSD | Lyon, Sioux | 44 min |
Nearby
Severe Thunderstorm Warnings in South Dakota, 2021Severe 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.