Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 37, NWS Sioux Falls, SD

July 5, 2021Brule County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 5, 2021, 3:17 PM CDT for Brule County, South Dakota. It was in force for 30 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: Jul 5, 2021, 3:17 PM CDT (20:17 UTC)
Expired: Jul 5, 2021, 3:47 PM CDT
In force: 30 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County Brule County, SD

The radar

The Sioux Falls radar (KFSD), 208 km from the middle of the area, began a volume at 20:19 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
Jul 5, 3:19 PM CDT	HAIL 1	11 S Chamberlain, SD	MOST OF THE HAIL WAS PEA SIZED, BUT SOME OF THE STONES WERE AS BIG AS QUARTERS. THIS WAS ACCOMPANIED BY VERY HEAVY RAIN.

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, 8.3 hours before the alert went out and 158 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: 1844 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: -42 m²/s²
0-3 km storm-relative helicity: 14 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

519 
WUUS53 KFSD 052017
SVRFSD
SDC015-052100-
/O.NEW.KFSD.SV.W.0037.210705T2017Z-210705T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
317 PM CDT Mon Jul 5 2021

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Southwestern Brule County in south central South Dakota...

* Until 400 PM CDT.

* At 317 PM CDT, a severe thunderstorm was located 8 miles northeast
  of Iona, or 10 miles south of Chamberlain, moving northeast at 5
  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 Brule County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4376 9931 4362 9912 4355 9931 4356 9933
      4357 9934 4363 9934 4366 9938 4366 9941
TIME...MOT...LOC 2017Z 218DEG 6KT 4364 9932 

HAIL...1.25IN
WIND...60MPH
 
$$

JM

2 follow-up statements

811 
WWUS53 KFSD 052038
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
338 PM CDT Mon Jul 5 2021

SDC015-052100-
/O.CON.KFSD.SV.W.0037.000000T0000Z-210705T2100Z/
Brule SD-
338 PM CDT Mon Jul 5 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM CDT
FOR SOUTHWESTERN BRULE COUNTY...

At 336 PM CDT, a severe thunderstorm was located 8 miles south of
Chamberlain, moving northeast at 5 mph.

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

SOURCE...Spotter reported. At 3:19 PM CDT quarter size hail was 
         reported 11 miles south of Chamberlain.

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

Locations impacted include...
Chamberlain and Lake Francis Case. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4376 9931 4362 9912 4355 9931 4356 9933
      4357 9934 4363 9934 4366 9938 4366 9941
TIME...MOT...LOC 2036Z 218DEG 6KT 4367 9929 

HAIL...1.25IN
WIND...60MPH
 
$$

JM

652 
WWUS53 KFSD 052047
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
347 PM CDT Mon Jul 5 2021

SDC015-052056-
/O.CAN.KFSD.SV.W.0037.000000T0000Z-210705T2100Z/
Brule SD-
347 PM CDT Mon Jul 5 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN BRULE COUNTY IS
CANCELLED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled.

LAT...LON 4376 9931 4362 9912 4355 9931 4356 9933
      4357 9934 4363 9934 4366 9938 4366 9941
TIME...MOT...LOC 2045Z 218DEG 6KT 4368 9927 

$$

JM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 5, 3:24 AM CDT	Heat Advisory	FSD	Aurora, Bon Homme, Brule, Charles Mix, Clay, Davison and 10 more	17 hr
Jul 5, 5:00 PM CDT	Severe Thunderstorm Warning	FSD	Hutchinson, Turner	29 min
Jul 5, 6:15 PM CDT	Severe Thunderstorm Warning	FSD	McCook, Minnehaha	45 min
Jul 5, 6:37 PM CDT	Severe Thunderstorm Warning	FSD	Lake, Lincoln, Minnehaha, Turner	38 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.