Alert archive / South Dakota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 248, NWS Rapid City, SD

August 10, 2012Custer County, South Dakota

NWS Rapid City, SD issued this severe thunderstorm warning at Aug 10, 2012, 4:54 PM MDT for Custer County, South Dakota. It was in force for 66 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 10, 2012, 4:54 PM MDT (22:54 UTC)
Expired
Aug 10, 2012, 6:00 PM MDT
In force
66 min
Issued by
NWS Rapid City, SD
Area
Storm-based polygon
Hail
1.5 in
Wind
60.0 mph

County Custer County, SD

The radar

The Rapid City radar (KUDX), 70 km from the middle of the area, began a volume at 22:54 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 12:00Z, 10.9 hours before the alert went out and 63 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-pSkew-T log-p diagram, Rapid City, SD at 12:00Z on 2012-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Rapid City, SD at 12:00Z on 2012-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 65 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
2169 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
65 m²/s²
0-3 km storm-relative helicity
121 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

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 10, 3:11 PM MDT, 1 hour 43 minutes earlier.

Area forecast discussion, Aug 10, 3:11 PM MDT, 1 hour 43 minutes before
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Hazardous weather outlook, Aug 10, 6:26 AM MDT, 10 hours 28 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RAPID CITY SD
626 AM MDT FRI AUG 10 2012

SDZ001-002-012>014-024>032-041>044-046-047-049-072>074-WYZ054>058-
071-111300-
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-
626 AM MDT (726 AM CDT) FRI AUG 10 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN SOUTH DAKOTA AND
NORTHEASTERN WYOMING.

.DAY ONE...TODAY AND TONIGHT

THERE WILL BE A CHANCE FOR THUNDERSTORMS THIS AFTERNOON ACROSS
NORTHEASTERN WYOMING AND FAR WESTERN SOUTH DAKOTA...WITH THE
CHANCES SPREADING EASTWARD ACROSS THE REST OF THE FORECAST AREA
TONIGHT. THE THREAT FOR WIDESPREAD SEVERE THUNDERSTORMS IS LOW...BUT
ISOLATED STRONG TO SEVERE STORMS ARE POSSIBLE WITH HAIL...GUSTY
WINDS...AND HEAVY RAIN. THE BETTER CHANCES FOR STRONGER
THUNDERSTORMS WOULD BE OVER NORTHEASTERN WYOMING AND FAR WESTERN
SOUTH DAKOTA DURING THE LATE AFTERNOON AND EARLY EVENING HOURS.

THE GRASSLAND FIRE DANGER INDEX WILL BE IN THE EXTREME CATEGORY THIS
AFTERNOON ACROSS MUCH OF THE WESTERN SOUTH DAKOTA PLAINS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THE CHANCE FOR THUNDERSTORMS WILL CONTINUE ON SATURDAY ACROSS THE
AREA AS A COLD FRONT MOVES EAST ACROSS THE FORECAST AREA. A FEW
STRONG TO SEVERE THUNDERSTORMS ARE POSSIBLE DURING THE MIDDAY
THROUGH EARLY EVENING HOURS...MAINLY FOR AREAS SOUTH AND EAST OF
THE BLACK HILLS. HAIL AND GUSTY WINDS ARE LIKELY WITH ANY STRONGER
STORMS THAT DEVELOP.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY.

In the hours before

Local storm report, Aug 10, 2:15 PM MDT, 2 hours 39 minutes before
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Local storm report, Aug 10, 2:17 PM MDT, 2 hours 37 minutes before
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Local storm report, Aug 10, 3:40 PM MDT, 1 hour 14 minutes before
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Local storm report, Aug 10, 3:49 PM MDT, 1 hour 5 minutes before
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Local storm report, Aug 10, 4:17 PM MDT, 37 minutes before
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Local storm report, Aug 10, 4:53 PM MDT, 1 minute before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
453 PM MDT FRI AUG 10 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0435 PM     HAIL             HAYWARD                 43.87N 103.33W
08/10/2012  E1.00 INCH       PENNINGTON         SD   TRAINED SPOTTER

&&

POJORLIE

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 10, 1:52 PM MDTSpecial Weather StatementUNRLawrence23 min
Aug 10, 1:54 PM MDTSevere Thunderstorm WarningUNRLawrence51 min
Aug 10, 2:30 PM MDTSevere Thunderstorm WarningUNRLawrence, Meade60 min
Aug 10, 3:08 PM MDTSevere Thunderstorm WarningUNRPennington67 min
Aug 10, 4:06 PM MDTSevere Thunderstorm WarningUNRCuster, Pennington69 min
Aug 10, 5:47 PM MDTSpecial Weather StatementUNROglala Lakota58 min
Aug 10, 5:24 PM MDTSpecial Weather StatementUNRWeston66 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.