Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 13, NWS Rapid City, SD

May 23, 2021Butte County, Meade County, Pennington County, South Dakota

NWS Rapid City, SD issued this severe thunderstorm warning at May 23, 2021, 5:04 PM MDT for Butte County, Meade County, Pennington 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: May 23, 2021, 5:04 PM MDT (23:04 UTC)
Expired: May 23, 2021, 5:34 PM MDT
In force: 30 min
Issued by: NWS Rapid City, SD
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

Counties Butte County, SD, Meade County, SD, Pennington County, SD

The radar

The Rapid City radar (KUDX), 34 km from the middle of the area, began a volume at 23:03 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
May 23, 5:10 PM MDT	TSTM WND GST 60	12 Wsw Hereford, 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
May 23, 1:50 PM MDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 11.1 hours before the alert went out and 39 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: 549 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 271 m²/s²
0-3 km storm-relative helicity: 339 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

733 
WUUS53 KUNR 232304
SVRUNR
SDC019-093-103-232345-
/O.NEW.KUNR.SV.W.0013.210523T2304Z-210523T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Rapid City SD
504 PM MDT Sun May 23 2021

The National Weather Service in Rapid City has issued a

* Severe Thunderstorm Warning for...
  Southeastern Butte County in northwestern South Dakota...
  Southern Meade County in west central South Dakota...
  Central Pennington County in west central South Dakota...

* Until 545 PM MDT.

* At 504 PM MDT, severe thunderstorms were located along a line
  extending from 9 miles east of Bear Butte State Park to 8 miles
  north of Ellsworth Air Force Base to 3 miles northeast of Caputa,
  moving northeast at 45 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Severe thunderstorms will be near...
  Hereford and Viewfield around 520 PM MDT.

Other locations in the path of these severe thunderstorms include
Curlew Lake, Union Center, Elm Springs and Fairpoint.

This includes Interstate 90 in South Dakota between Mile Markers 67
and 91.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM MDT for northwestern
and west central South Dakota.

&&

LAT...LON 4466 10310 4478 10281 4422 10222 4396 10297
      4421 10311 4444 10337
TIME...MOT...LOC 2304Z 219DEG 41KT 4446 10323 4427 10305 4403 10294 

HAIL...0.88IN
WIND...60MPH
 
$$

Carstens

2 follow-up statements

927 
WWUS53 KUNR 232316
SVSUNR

Severe Weather Statement
National Weather Service Rapid City SD
516 PM MDT Sun May 23 2021

SDC019-093-103-232345-
/O.CON.KUNR.SV.W.0013.000000T0000Z-210523T2345Z/
Butte SD-Meade SD-Pennington SD-
516 PM MDT Sun May 23 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM MDT
FOR SOUTHEASTERN BUTTE...SOUTHERN MEADE AND EAST CENTRAL PENNINGTON
COUNTIES...

At 516 PM MDT, severe thunderstorms were located along a line
extending from 10 miles south of Owl Butte to near Hereford to 2
miles east of New Underwood, moving northeast at 50 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.

These severe storms will be near...
  Hereford around 520 PM MDT.

Other locations in the path of these severe thunderstorms include
Curlew Lake, Union Center, Elm Springs and Fairpoint.

This includes Interstate 90 in South Dakota between Mile Markers 72
and 77.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM MDT for northwestern
and west central South Dakota.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4466 10310 4478 10281 4422 10222 4409 10292
      4421 10311 4447 10334
TIME...MOT...LOC 2316Z 225DEG 43KT 4456 10318 4439 10291 4410 10279 

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

Carstens

266 
WWUS53 KUNR 232334
SVSUNR

Severe Weather Statement
National Weather Service Rapid City SD
534 PM MDT Sun May 23 2021

SDC019-093-103-232344-
/O.CAN.KUNR.SV.W.0013.000000T0000Z-210523T2345Z/
Butte SD-Meade SD-Pennington SD-
534 PM MDT Sun May 23 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BUTTE...SOUTHERN
MEADE AND EAST CENTRAL PENNINGTON COUNTIES IS CANCELLED...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning has been cancelled.  However small hail, gusty
winds and heavy rain are still possible with these thunderstorms.

A Tornado Watch remains in effect until 900 PM MDT for northwestern
and west central South Dakota.

LAT...LON 4466 10310 4478 10281 4422 10222 4409 10292
      4421 10311 4447 10334
TIME...MOT...LOC 2333Z 219DEG 41KT 4472 10300 4455 10273 4426 10261 

$$

Carstens

The office that day

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

Issued	Product	Office	Counties	Lasted
May 23, 3:20 AM MDT	Special Weather Statement	UNR	Oglala Lakota	40 min
May 23, 4:57 AM MDT	Special Weather Statement	UNR	Meade	33 min
May 23, 5:23 AM MDT	Special Weather Statement	UNR	Jackson	37 min
May 23, 1:40 PM MDT	Special Weather Statement	UNR	Fall River	35 min
May 23, 2:00 PM MDT	Special Weather Statement	UNR	Custer	30 min
May 23, 2:02 PM MDT	Special Weather Statement	UNR	Meade	28 min
May 23, 2:16 PM MDT	Special Weather Statement	UNR	Pennington	29 min
May 23, 2:45 PM MDT	Tornado Warning	UNR	Meade	30 min
May 23, 3:13 PM MDT	Tornado Warning	UNR	Meade, Perkins	47 min
May 23, 3:34 PM MDT	Special Weather Statement	UNR	Fall River	26 min
May 23, 3:53 PM MDT	Severe Thunderstorm Warning	UNR	Custer	37 min
May 23, 3:58 PM MDT	Tornado Warning	UNR	Perkins	47 min
May 23, 3:59 PM MDT	Tornado Warning	UNR	Custer	31 min
May 23, 4:14 PM MDT	Tornado Warning	UNR	Custer, Pennington	13 min
May 23, 4:26 PM MDT	Severe Thunderstorm Warning	UNR	Custer, Lawrence, Meade, Pennington	49 min
May 23, 4:26 PM MDT	Severe Thunderstorm Warning	UNR	Butte, Meade, Pennington	33 min
May 23, 5:35 PM MDT	Special Weather Statement	UNR	Perkins	40 min
May 23, 5:53 PM MDT	Severe Thunderstorm Warning	UNR	Haakon, Meade, Pennington, Ziebach	67 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.