Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 143, NWS Rapid City, SD
NWS Rapid City, SD issued this severe thunderstorm warning at Jul 23, 2021, 5:25 PM MDT for Harding County, Perkins County, South Dakota. It was in force for 44 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 23, 2021, 5:25 PM MDT (23:25 UTC)
- Expired
- Jul 23, 2021, 6:09 PM MDT
- In force
- 44 min
- Issued by
- NWS Rapid City, SD
- Area
- Storm-based polygon
- Hail
- 1.5 in
- Wind
- 60.0 mph
Counties Harding County, SD, Perkins County, SD
The radar
The Rapid City radar (KUDX), 157 km from the middle of the area, began a volume at 23:26 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.
The nearest sounding before it
Bismarck Municip, ND (KBIS), launched 12:00Z, 11.4 hours before the alert went out and 223 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.
- Mixed-layer CAPE
- 108 J/kg
- Mixed-layer CIN
- -435 J/kg
- Mixed-layer LCL
- 1738 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 143 m²/s²
- 0-3 km storm-relative helicity
- 125 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Rapid City, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 23, 12:31 PM MDT, 4 hours 54 minutes earlier.
Area forecast discussion, Jul 23, 12:31 PM MDT, 4 hours 54 minutes before
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</html>Hazardous weather outlook, Jul 23, 11:06 AM MDT, 6 hours 19 minutes before
Hazardous Weather Outlook National Weather Service Rapid City SD 1106 AM MDT Fri Jul 23 2021 SDZ002-014-046-047-049-241300- Perkins-Ziebach-Mellette-Todd-Tripp- 1106 AM MDT Fri Jul 23 2021 /1206 PM CDT Fri Jul 23 2021/ This Hazardous Weather Outlook is for portions of northwestern and south central South Dakota. .DAY ONE...TODAY AND TONIGHT There is a slight risk of severe thunderstorms this afternoon and evening. Large hail and damaging winds are possible over northwestern South Dakota, while thunderstorms may produce locally damaging winds across south central South Dakota. .DAYS TWO THROUGH SEVEN...Saturday through Thursday There is a chance of thunderstorms Saturday and Sunday. Severe thunderstorms are not expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today. && Stay tuned to NOAA weather radio for further updates...or check our web site at weather.gov/rapidcity SDZ001-012-013-024>032-041>044-072>074-241300- Harding-Butte-Northern Meade Co Plains-Northern Black Hills- Northern Foot Hills-Rapid City-Southern Foot Hills- Central Black Hills-Southern Black Hills-Custer Co Plains- Pennington Co Plains-Haakon-Fall River-Oglala Lakota-Jackson- Bennett-Sturgis/Piedmont Foot Hills-Southern Meade Co Plains- Hermosa Foot Hills- 1106 AM MDT Fri Jul 23 2021 This Hazardous Weather Outlook is for portions of northwestern and southwestern South Dakota...and the Black Hills of South Dakota. .DAY ONE...TODAY AND TONIGHT Isolated severe thunderstorms may produce large hail and damaging winds this afternoon and evening. .DAYS TWO THROUGH SEVEN...Saturday through Thursday There is a chance of thunderstorms Saturday and Sunday. Severe thunderstorms are not expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today. && Stay tuned to NOAA weather radio for further updates...or check our web site at weather.gov/rapidcity WYZ054>058-071-241300- Northern Campbell-Southern Campbell-Western Crook- Wyoming Black Hills-Weston-Northeastern Crook- 1106 AM MDT Fri Jul 23 2021 This Hazardous Weather Outlook is for portions of northeast Wyoming...and the Black Hills of Wyoming. .DAY ONE...Today and Tonight There is a chance of thunderstorms this afternoon and evening. Severe thunderstorms are not expected at this time. .DAYS TWO THROUGH SEVEN...Saturday through Thursday There is a chance of thunderstorms Saturday and Sunday. Severe thunderstorms are not expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today. && Stay tuned to NOAA weather radio for further updates...or check our web site at weather.gov/rapidcity
In the hours before
Special weather statement, Jul 23, 5:03 PM MDT, 22 minutes before
Special Weather Statement National Weather Service Rapid City SD 503 PM MDT Fri Jul 23 2021 SDZ001-002-232345- Perkins SD-Harding SD- 503 PM MDT Fri Jul 23 2021 ...STRONG THUNDERSTORM OVER EAST CENTRAL HARDING AND SOUTHWESTERN PERKINS COUNTIES... At 503 PM MDT, Doppler radar was tracking a strong thunderstorm near Sorum, or 33 miles east of Buffalo, moving east at 25 mph. Penny size hail and winds in excess of 40 mph will be possible with this storm. Locations impacted include... Sorum and Date. LAT...LON 4541 10301 4552 10294 4546 10251 4524 10267 TIME...MOT...LOC 2303Z 288DEG 20KT 4543 10289 Helgeson
Special weather statement, Jul 23, 5:13 PM MDT, 12 minutes before
Special Weather Statement National Weather Service Rapid City SD 513 PM MDT Fri Jul 23 2021 SDZ012-013-240000- Butte SD-Northern Meade Co Plains SD- 513 PM MDT Fri Jul 23 2021 ...STRONG THUNDERSTORM OVER EAST CENTRAL BUTTE AND NORTH CENTRAL MEADE COUNTIES... At 513 PM MDT, Doppler radar was tracking a strong thunderstorm 10 miles southwest of Mud Butte, or 41 miles northeast of Sturgis, moving east at 25 mph. Nickel size hail and winds in excess of 40 mph will be possible with this storm. Locations impacted include... Fairpoint. PRECAUTIONARY/PREPAREDNESS ACTIONS... This storm may intensify, so be certain to monitor local radio stations and available television stations for additional information and possible warnings from the National Weather Service. && LAT...LON 4489 10311 4495 10302 4492 10259 4473 10278 TIME...MOT...LOC 2313Z 288DEG 20KT 4490 10302 Helgeson
The office that day
Everything else NWS Rapid City, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 22, 6:18 PM MDT | Special Weather Statement | UNR | Fall River | 57 min |
| Jul 22, 7:33 PM MDT | Special Weather Statement | UNR | Jackson | 57 min |
| Jul 23, 5:03 PM MDT | Special Weather Statement | UNR | Perkins | 42 min |
| Jul 23, 5:13 PM MDT | Special Weather Statement | UNR | Meade | 47 min |
Nearby
Severe Thunderstorm Warnings in South Dakota, 2021Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.