Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 145, NWS Sioux Falls, SD

August 30, 2021Davison County, Hanson County, Hutchinson County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 30, 2021, 4:19 PM CDT for Davison County, Hanson County, Hutchinson County, South Dakota. It was in force for 56 min. 3 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 30, 2021, 4:19 PM CDT (21:19 UTC)
Expired: Aug 30, 2021, 5:15 PM CDT
In force: 56 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Davison County, SD, Hanson County, SD, Hutchinson County, SD

The radar

The Sioux Falls radar (KFSD), 104 km from the middle of the area, began a volume at 21:21 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 30, 4:41 PM CDT	HAIL 1	8 Nw Ethan, SD	QUARTER SIZED HAIL AND HEAVY RAIN.
Aug 30, 5:03 PM CDT	HAIL 1	3 Nnw Ethan, SD	LOTS OF VARIABLE SIZED HAIL AND HEAVY RAIN, WITH BIGGEST STONES AS BIG AS QUARTERS.
Aug 30, 5:13 PM CDT	HAIL 0.88	1 Ne Ethan, SD	HEAVY RAIN AND HAIL UP TO THE SIZE OF NICKELS.

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 12:00Z, 9.3 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-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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1772 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 51 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

546 
WUUS53 KFSD 302119
SVRFSD
SDC035-061-067-302215-
/O.NEW.KFSD.SV.W.0145.210830T2119Z-210830T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
419 PM CDT Mon Aug 30 2021

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Southern Davison County in southeastern South Dakota...
  Southwestern Hanson County in southeastern South Dakota...
  Northwestern Hutchinson County in southeastern South Dakota...

* Until 515 PM CDT.

* At 419 PM CDT, a severe thunderstorm was located near Mount Vernon,
  or 10 miles southwest of Mitchell, moving east at 20 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.

* Locations impacted include...
  Ethan and Dimock.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4366 9772 4341 9784 4355 9829 4364 9831
      4374 9824
TIME...MOT...LOC 2119Z 288DEG 18KT 4364 9821 

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

$$

BP

3 follow-up statements

438 
WWUS53 KFSD 302144
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
444 PM CDT Mon Aug 30 2021

SDC035-061-067-302215-
/O.CON.KFSD.SV.W.0145.000000T0000Z-210830T2215Z/
Davison SD-Hanson SD-Hutchinson SD-
444 PM CDT Mon Aug 30 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM CDT
FOR SOUTHEASTERN DAVISON...SOUTHWESTERN HANSON AND NORTHWESTERN
HUTCHINSON COUNTIES...

At 443 PM CDT, a severe thunderstorm was located near Ethan, or 10
miles south of Mitchell, moving east at 25 mph.

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

SOURCE...Trained weather spotters reported quarter sized hail 8 
         miles NW of Ethan.

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

Locations impacted include...
Ethan and Dimock. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4366 9772 4341 9784 4351 9817 4363 9817
      4368 9808
TIME...MOT...LOC 2143Z 288DEG 20KT 4359 9807 

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

$$

BP

665 
WWUS53 KFSD 302205
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
505 PM CDT Mon Aug 30 2021

SDC035-061-067-302215-
/O.CON.KFSD.SV.W.0145.000000T0000Z-210830T2215Z/
Davison SD-Hanson SD-Hutchinson SD-
505 PM CDT Mon Aug 30 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM CDT
FOR SOUTHEASTERN DAVISON...SOUTHWESTERN HANSON AND NORTH CENTRAL
HUTCHINSON COUNTIES...

At 504 PM CDT, a severe thunderstorm was located over Ethan, or 11
miles north of Parkston, moving east at 20 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Trained weather spotters reported quarter sized hail near 
         Ethan SD at 500 PM.

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

Locations impacted include...
Ethan and Dimock. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4364 9773 4341 9784 4348 9803 4361 9803
      4366 9795
TIME...MOT...LOC 2204Z 289DEG 18KT 4355 9793 

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

$$

BP

520 
WWUS53 KFSD 302217
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
517 PM CDT Mon Aug 30 2021

SDC035-061-067-302226-
/O.EXP.KFSD.SV.W.0145.000000T0000Z-210830T2215Z/
Davison SD-Hanson SD-Hutchinson SD-
517 PM CDT Mon Aug 30 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN DAVISON...
SOUTHWESTERN HANSON AND NORTH CENTRAL HUTCHINSON COUNTIES HAS
EXPIRED...
                
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 has been allowed to expire.  However small
hail and gusty winds are still possible with this thunderstorm.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Sioux Falls.

LAT...LON 4364 9773 4341 9784 4348 9803 4361 9803
      4366 9795
TIME...MOT...LOC 2216Z 288DEG 18KT 4353 9785 

$$

BP

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 30, 5:25 PM CDT	Severe Thunderstorm Warning	FSD	Hutchinson, Turner	35 min
Aug 30, 5:30 PM CDT	Severe Thunderstorm Warning	FSD	Hanson, Hutchinson, McCook	30 min
Aug 30, 5:59 PM CDT	Severe Thunderstorm Warning	FSD	Hutchinson, Turner, Yankton	23 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.