Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 154, NWS Sioux Falls, SD

August 31, 2021Aurora County, Davison County, Douglas County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 31, 2021, 12:05 AM CDT for Aurora County, Davison County, Douglas County, South Dakota. It was in force for 40 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 31, 2021, 12:05 AM CDT (05:05 UTC)
Expired
Aug 31, 2021, 12:45 AM CDT
In force
40 min
Issued by
NWS Sioux Falls, SD
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Aurora County, SD, Davison County, SD, Douglas County, SD

The radar

The Sioux Falls radar (KFSD), 133 km from the middle of the area, began a volume at 05:05 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

TimeReportWhereRemark
Aug 31, 12:08 AM CDTHAIL 12 Sse Stickney, SDHEAVY RAIN AND HAIL UP TO THE SIZE OF QUARTERS.

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.

IssuedProductOfficeLasted
Aug 30, 9:57 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 5.1 hours before the alert went out and 147 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.

Skew-T log-pSkew-T log-p diagram, Aberdeen, SD at 00:00Z on 2021-08-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 205 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Aberdeen, SD at 00:00Z on 2021-08-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 34 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
205 J/kg
Mixed-layer CIN
-60 J/kg
Mixed-layer LCL
1953 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
34 m²/s²
0-3 km storm-relative helicity
126 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

As transmitted.

385 
WUUS53 KFSD 310505
SVRFSD
SDC003-035-043-310545-
/O.NEW.KFSD.SV.W.0154.210831T0505Z-210831T0545Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
1205 AM CDT Tue Aug 31 2021

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Southwestern Davison County in southeastern South Dakota...
  Southeastern Aurora County in south central South Dakota...
  Northeastern Douglas County in south central South Dakota...

* Until 1245 AM CDT.

* At 1205 AM CDT, a severe thunderstorm was located over Stickney, or
  10 miles southeast of Plankinton, moving east at 15 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.

* This severe thunderstorm will remain over mainly rural areas of
  southwestern Davison, southeastern Aurora and northeastern Douglas
  Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4364 9857 4369 9811 4343 9812 4347 9856
TIME...MOT...LOC 0505Z 268DEG 13KT 4357 9840 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

APT
2 follow-up statements
909 
WWUS53 KFSD 310524
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1224 AM CDT Tue Aug 31 2021

SDC003-035-043-310545-
/O.CON.KFSD.SV.W.0154.000000T0000Z-210831T0545Z/
Davison SD-Aurora SD-Douglas SD-
1224 AM CDT Tue Aug 31 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1245 AM CDT
FOR SOUTHWESTERN DAVISON...SOUTHEASTERN AURORA AND NORTHEASTERN
DOUGLAS COUNTIES...

At 1224 AM CDT, a severe thunderstorm was located near Stickney, or
13 miles southeast of Plankinton, moving east at 15 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

This severe thunderstorm will remain over mainly rural areas of
southwestern Davison, southeastern Aurora and northeastern Douglas
Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4364 9857 4369 9811 4343 9812 4347 9856
TIME...MOT...LOC 0524Z 268DEG 13KT 4357 9830 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

APT
207 
WWUS53 KFSD 310542
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1242 AM CDT Tue Aug 31 2021

SDC003-035-043-310551-
/O.EXP.KFSD.SV.W.0154.000000T0000Z-210831T0545Z/
Davison SD-Aurora SD-Douglas SD-
1242 AM CDT Tue Aug 31 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN DAVISON...
SOUTHEASTERN AURORA AND NORTHEASTERN DOUGLAS COUNTIES WILL EXPIRE AT
1245 AM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However small hail
and gusty winds are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 500 AM CDT for
south central and southeastern South Dakota.

LAT...LON 4364 9857 4369 9811 4343 9812 4347 9856
TIME...MOT...LOC 0541Z 268DEG 13KT 4357 9822 

$$

APT

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 30, 7:29 PM CDTSevere Thunderstorm WarningFSDClay, Union46 min
Aug 30, 7:57 PM CDTSevere Thunderstorm WarningFSDHutchinson, McCook, Minnehaha, Turner48 min
Aug 30, 11:19 PM CDTSevere Thunderstorm WarningFSDBeadle, Jerauld, Sanborn41 min
Aug 31, 12:00 AM CDTFlash Flood WarningFSDAurora, Brule3 hr
Aug 31, 12:15 AM CDTSevere Thunderstorm WarningFSDHanson, Hutchinson45 min
Aug 31, 1:26 AM CDTSevere Thunderstorm WarningFSDBon Homme, Charles Mix, Gregory49 min
Aug 31, 2:14 AM CDTSevere Thunderstorm WarningFSDBon Homme, Charles Mix31 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 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.