Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 59, NWS Aberdeen, SD

July 23, 2021Corson County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 23, 2021, 7:14 PM MDT for Corson County, South Dakota. It was in force for 46 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: Jul 23, 2021, 7:14 PM MDT (01:14 UTC)
Expired: Jul 23, 2021, 8:00 PM MDT
In force: 46 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Corson County, SD

The radar

The Bismarck radar (KBIS), 130 km from the middle of the area, began a volume at 01:16 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 23, 7:25 PM MDT	TSTM WND GST 60	8 Ese Lemmon, SD
Jul 23, 7:25 PM MDT	HAIL 1	8 Ese Lemmon, SD

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.

Issued	Product	Office	Lasted
Jul 23, 6:02 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 1.2 hours before the alert went out and 133 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: 568 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 2719 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 40 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

248 
WUUS53 KABR 240114
SVRABR
SDC031-240200-
/O.NEW.KABR.SV.W.0059.210724T0114Z-210724T0200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Aberdeen SD
714 PM MDT Fri Jul 23 2021

The National Weather Service in Aberdeen has issued a

* Severe Thunderstorm Warning for...
  Northwestern Corson County in north central South Dakota...

* Until 800 PM MDT.

* At 713 PM MDT, a severe thunderstorm was located 8 miles south of
  Thunder Hawk, or 13 miles southeast of Lemmon, moving east at 30
  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 be near...
  Keldron around 725 PM MDT.

Other locations in the path of this severe thunderstorm include
Morristown and Watauga.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4594 10200 4594 10146 4566 10149 4571 10200
TIME...MOT...LOC 0113Z 269DEG 26KT 4582 10193 

HAIL...1.00IN
WIND...60MPH
 
$$

Lueck

3 follow-up statements

172 
WWUS53 KABR 240135
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
735 PM MDT Fri Jul 23 2021

SDC031-240200-
/O.CON.KABR.SV.W.0059.000000T0000Z-210724T0200Z/
Corson SD-
735 PM MDT Fri Jul 23 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM MDT
FOR NORTHWESTERN CORSON COUNTY...

At 734 PM MDT, a severe thunderstorm was located near Thunder Hawk,
or 12 miles east of Lemmon, moving east at 25 mph.

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

SOURCE...Trained weather spotters. At 720 PM MDT, quarter sized hail 
         was reported 7 miles east of Lemmon.

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

Locations impacted include...
  Keldron, Morristown and Watauga.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4589 10147 4586 10194 4586 10200 4594 10200
      4594 10146
TIME...MOT...LOC 0134Z 254DEG 20KT 4591 10190 

HAIL...1.00IN
WIND...60MPH
 
$$

Lueck

529 
WWUS53 KABR 240150
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
750 PM MDT Fri Jul 23 2021

SDC031-240200-
/O.CON.KABR.SV.W.0059.000000T0000Z-210724T0200Z/
Corson SD-
750 PM MDT Fri Jul 23 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM MDT
FOR NORTHWESTERN CORSON COUNTY...

At 749 PM MDT, a severe thunderstorm was located over Morristown, or
20 miles east of Lemmon, moving east at 30 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.

Locations impacted include...
Morristown, Watauga and Keldron. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4587 10182 4594 10186 4594 10146 4589 10147
TIME...MOT...LOC 0149Z 269DEG 26KT 4591 10174 

HAIL...1.00IN
WIND...60MPH
 
$$

Lueck

240 
WWUS53 KABR 240154
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
754 PM MDT Fri Jul 23 2021

SDC031-240203-
/O.EXP.KABR.SV.W.0059.000000T0000Z-210724T0200Z/
Corson SD-
754 PM MDT Fri Jul 23 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CORSON COUNTY
WILL EXPIRE AT 800 PM MDT...
                
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 gusty
winds are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 100 AM MDT for
north central South Dakota.

LAT...LON 4587 10182 4594 10186 4594 10146 4589 10147
TIME...MOT...LOC 0153Z 269DEG 26KT 4591 10171 

$$

Lueck

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 7:42 PM MDT	Special Weather Statement	ABR	Corson	33 min
Jul 23, 8:27 PM MDT	Special Weather Statement	ABR	Marshall	33 min
Jul 23, 8:47 PM MDT	Severe Thunderstorm Warning	ABR	Campbell, Edmunds, McPherson	43 min
Jul 23, 9:06 PM MDT	Special Weather Statement	ABR	Walworth	24 min
Jul 23, 9:29 PM MDT	Severe Thunderstorm Warning	ABR	Brown, Edmunds, McPherson	46 min
Jul 23, 9:31 PM MDT	Severe Thunderstorm Warning	ABR	Brown, McPherson	44 min
Jul 23, 9:40 PM MDT	Special Weather Statement	ABR	Potter, Walworth	50 min
Jul 23, 9:42 PM MDT	Severe Thunderstorm Warning	ABR	Day, Marshall, Roberts	33 min
Jul 23, 9:54 PM MDT	Severe Thunderstorm Warning	ABR	Edmunds, Faulk, Potter, Sully, Walworth	51 min
Jul 23, 10:13 PM MDT	Severe Thunderstorm Warning	ABR	Roberts	35 min
Jul 23, 10:17 PM MDT	Severe Thunderstorm Warning	ABR	Brown, Marshall	30 min
Jul 23, 10:54 PM MDT	Special Weather Statement	ABR	Marshall	36 min
Jul 23, 11:43 PM MDT	Severe Thunderstorm Warning	ABR	Roberts	47 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.