Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 81, NWS Sioux Falls, SD

August 5, 2021Minnehaha County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 5, 2021, 11:40 PM CDT for Minnehaha County, South Dakota. It was in force for 50 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 5, 2021, 11:40 PM CDT (04:40 UTC)
Expired: Aug 6, 2021, 12:30 AM CDT
In force: 50 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.25 in
Wind: 50.0 mph

County Minnehaha County, SD

The radar

The Sioux Falls radar (KFSD), 8 km from the middle of the area, began a volume at 04:44 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, 11:49 PM CDT	HAIL 1	Crooks, SD	VIDEO VIA SOCIAL MEDIA.

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, 4.7 hours before the alert went out and 196 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 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

Open this sounding in Storm Lab

The text

As transmitted.

497 
WUUS53 KFSD 060440
SVRFSD
SDC099-060530-
/O.NEW.KFSD.SV.W.0081.210806T0440Z-210806T0530Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
1140 PM CDT Thu Aug 5 2021

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Central Minnehaha County in southeastern South Dakota...

* Until 1230 AM CDT.

* At 1140 PM CDT, a severe thunderstorm was located near Crooks, or
  13 miles northwest of Sioux Falls, moving east at 20 mph.

  HAZARD...Half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* This severe thunderstorm will be near...
  Crooks around 1155 PM CDT.

Other locations in the path of this severe thunderstorm include Sioux
Falls, Brandon, Garretson and Palisades State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.

&&

LAT...LON 4370 9649 4350 9658 4350 9661 4369 9696
      4377 9690
TIME...MOT...LOC 0440Z 288DEG 16KT 4371 9688 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

Chapman

3 follow-up statements

254 
WWUS53 KFSD 060456
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1156 PM CDT Thu Aug 5 2021

SDC099-060530-
/O.CON.KFSD.SV.W.0081.000000T0000Z-210806T0530Z/
Minnehaha SD-
1156 PM CDT Thu Aug 5 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT
FOR CENTRAL MINNEHAHA COUNTY...

At 1155 PM CDT, a severe thunderstorm was located over Crooks, or 7
miles north of Sioux Falls, moving southeast at 25 mph.

HAZARD...Ping pong ball size hail.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect damage 
         to roofs, siding, windows, and vehicles.

This severe storm will be near...
  Sioux Falls around 1200 AM CDT.
  Brandon around 1220 AM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

&&

LAT...LON 4370 9649 4350 9658 4350 9661 4369 9696
      4377 9690
TIME...MOT...LOC 0455Z 304DEG 21KT 4364 9678 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

Chapman

044 
WWUS53 KFSD 060513
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1213 AM CDT Fri Aug 6 2021

SDC099-060530-
/O.CON.KFSD.SV.W.0081.000000T0000Z-210806T0530Z/
Minnehaha SD-
1213 AM CDT Fri Aug 6 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT
FOR SOUTHEASTERN MINNEHAHA COUNTY...

At 1212 AM CDT, a severe thunderstorm was located near northern 
Sioux Falls, moving southeast at 20 mph.

HAZARD...Half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

This severe storm will be near... 
   Brandon around 1220 AM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

&&

LAT...LON 4350 9658 4350 9661 4363 9685 4369 9683
      4362 9653
TIME...MOT...LOC 0512Z 294DEG 16KT 4360 9669 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

Chapman

784 
WWUS53 KFSD 060528
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1228 AM CDT Fri Aug 6 2021

SDC099-060536-
/O.EXP.KFSD.SV.W.0081.000000T0000Z-210806T0530Z/
Minnehaha SD-
1228 AM CDT Fri Aug 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MINNEHAHA COUNTY
WILL EXPIRE AT 1230 AM CDT...
        
The storm which prompted the warning has weakened and moved out of 
the area. Therefore, the warning will be allowed to expire.  However 
small hail and heavy rain are still likely with this thunderstorm as 
it moves through southern Sioux Falls, Rowena and Harrisburg areas 
through 1245 am.

LAT...LON 4350 9658 4350 9661 4363 9685 4369 9683
      4362 9653
TIME...MOT...LOC 0526Z 295DEG 14KT 4357 9665 

$$

Chapman

The 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 Considerable damage threat	FSD	Minnehaha, Moody	51 min
Aug 5, 8:57 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Lincoln, Minnehaha	48 min
Aug 5, 9:04 PM CDT	Severe Thunderstorm Warning	FSD	Minnehaha	28 min
Aug 5, 10:04 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, McCook, Minnehaha, Turner	41 min
Aug 5, 10:36 PM CDT	Severe Thunderstorm Warning	FSD	Clay, Lincoln, Turner, Union	39 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

Nearby

Severe Thunderstorm Warnings in South Dakota, 2021 Every 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.