Alert archive / South Dakota / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 254, NWS Rapid City, SD
NWS Rapid City, SD issued this severe thunderstorm warning at Aug 13, 2012, 6:52 PM MDT for Harding County, South Dakota. It was in force for 53 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
- Aug 13, 2012, 6:52 PM MDT (00:52 UTC)
- Expired
- Aug 13, 2012, 7:45 PM MDT
- In force
- 53 min
- Issued by
- NWS Rapid City, SD
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Harding County, SD
The radar
The Rapid City radar (KUDX), 170 km from the middle of the area, began a volume at 00:55 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
Rapid City, SD (KRAP), launched 00:00Z, 0.9 hours before the alert went out and 175 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2759 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- -2 m²/s²
- 0-3 km storm-relative helicity
- 116 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 Aug 13, 5:59 PM MDT, 53 minutes earlier.
Area forecast discussion, Aug 13, 5:59 PM MDT, 53 minutes before
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</html>Hazardous weather outlook, Aug 13, 6:40 AM MDT, 12 hours 12 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RAPID CITY SD 640 AM MDT MON AUG 13 2012 SDZ001-002-012>014-024>032-041>044-046-047-049-072>074-WYZ054>058- 071-141300- BENNETT-BUTTE-CENTRAL BLACK HILLS-CUSTER CO PLAINS-FALL RIVER-HAAKON- HARDING-HERMOSA FOOT HILLS-JACKSON-MELLETTE-NORTHEASTERN CROOK- NORTHERN BLACK HILLS-NORTHERN CAMPBELL-NORTHERN FOOT HILLS- NORTHERN MEADE CO PLAINS-PENNINGTON CO PLAINS-PERKINS-RAPID CITY- SHANNON-SOUTHERN BLACK HILLS-SOUTHERN CAMPBELL-SOUTHERN FOOT HILLS- SOUTHERN MEADE CO PLAINS-STURGIS/PIEDMONT FOOT HILLS-TODD-TRIPP- WESTERN CROOK-WESTON-WYOMING BLACK HILLS-ZIEBACH- 640 AM MDT (740 AM CDT) MON AUG 13 2012 ...FIRE WEATHER WATCH TUESDAY AFTERNOON AND EARLY EVENING FOR THE NORTHEASTERN WYOMING PLAINS... THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN SOUTH DAKOTA AND NORTHEASTERN WYOMING. .DAY ONE...TODAY AND TONIGHT THERE IS A CHANCE FOR THUNDERSTORMS ACROSS FAR NORTHEASTERN WYOMING AND WESTERN SOUTH DAKOTA LATE THIS AFTERNOON AND TONIGHT. WIDESPREAD SEVERE THUNDERSTORMS ARE NOT EXPECTED...BUT ISOLATED STRONG TO SEVERE STORMS ARE POSSIBLE WITH HAIL AND GUSTY WINDS DURING THE LATE AFTERNOON AND EVENING HOURS. THE BEST THREAT FOR STRONGER STORMS WILL BE ACROSS FAR NORTHEASTERN WYOMING AND FAR WESTERN SOUTH DAKOTA. THE GRASSLAND FIRE DANGER INDEX WILL BE IN THE EXTREME CATEGORY THIS AFTERNOON ACROSS FAR SOUTHWESTERN SOUTH DAKOTA. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY HOT AND VERY DRY CONDITIONS WILL DEVELOP OVER NORTHEASTERN WYOMING ON TUESDAY AS A SURFACE TROF MOVES THROUGH AND BRINGS WEST TO NORTHWEST WINDS. HIGHS WILL BE IN THE LOWER 90S AND HUMIDITIES WILL DROP TO 10 TO 15 PERCENT IN THE AFTERNOON ACROSS MOST OF THE NORTHEASTERN WYOMING PLAINS. GUSTS UP TO 30 MPH ARE POSSIBLE IN THE AFTERNOON AND EARLY EVENING. THE HAINES INDEX WILL ALSO BE IN THE HIGH CATEGORY. THE COMBINATION OF THESE CONDITIONS WOULD CREATE CRITICAL FIRE WEATHER CONDITIONS ACROSS THE NORTHEASTERN WYOMING PLAINS. A FIRE WEATHER WATCH IS IN EFFECT FOR THE NORTHEASTERN WYOMING PLAINS FOR TUESDAY AFTERNOON AND EARLY EVENING. THERE IS A CHANCE FOR THUNDERSTORMS ACROSS PORTIONS OF THE AREA WEDNESDAY AND WEDNESDAY NIGHT AS A STRONG COLD FRONT CROSSES THE REGION. SEVERE THUNDERSTORMS ARE NOT EXPECTED AT THIS TIME. STRONG NORTHWESTERLY WINDS ARE EXPECTED BEHIND THE FRONTAL PASSAGE BY WEDNESDAY AFTERNOON...WITH WIND GUSTS OVER 45 MPH POSSIBLE ACROSS THE NORTHWESTERN AND WEST CENTRAL SOUTH DAKOTA PLAINS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY.
In the hours before
Special weather statement, Aug 13, 5:43 PM MDT, 1 hour 9 minutes before
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</html>The office that day
Everything else NWS Rapid City, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 13, 7:49 PM MDT | Special Weather Statement | UNR | Butte | 56 min |
| Aug 13, 9:20 PM MDT | Special Weather Statement | UNR | Butte | 25 min |
| Aug 13, 9:24 PM MDT | Special Weather Statement | UNR | Meade | 36 min |
| Aug 13, 11:07 PM MDT | Special Weather Statement | UNR | Haakon, Pennington | 38 min |
| Aug 14, 3:01 PM MDT | High Wind Warning | UNR | Custer, Meade, Oglala Lakota, Pennington | 24 hr |
| Aug 14, 3:01 PM MDT | Wind Advisory | UNR | Bennett, Butte, Custer, Fall River, Haakon, Harding and 10 more | 29 hr |
| Aug 13, 8:10 PM MDT | Special Weather Statement | UNR | Crook | 50 min |
| Aug 13, 9:44 PM MDT | Special Weather Statement | UNR | Crook | 31 min |
Nearby
Severe Thunderstorm Warnings in South Dakota, 2012Every severe thunderstorm warning in 2012
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.