Alert archive / South Dakota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 241, NWS Rapid City, SD

August 7, 2012Custer County, Fall River County, South Dakota

NWS Rapid City, SD issued this severe thunderstorm warning at Aug 7, 2012, 1:13 PM MDT for Custer County, Fall River 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
Aug 7, 2012, 1:13 PM MDT (19:13 UTC)
Expired
Aug 7, 2012, 1:57 PM MDT
In force
44 min
Issued by
NWS Rapid City, SD
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Custer County, SD, Fall River County, SD

The radar

The Rapid City radar (KUDX), 91 km from the middle of the area, began a volume at 19:14 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

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 7.2 hours before the alert went out and 351 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, N. Platte/Lee Bi, NE at 12:00Z on 2012-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 709 joules per kilogram.LCLLFCEL10008507005003002001001 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, N. Platte/Lee Bi, NE at 12:00Z on 2012-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 47 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
709 J/kg
Mixed-layer CIN
-394 J/kg
Mixed-layer LCL
1831 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
47 m²/s²
0-3 km storm-relative helicity
37 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 7, 11:11 AM MDT, 2 hours 2 minutes earlier.

Area forecast discussion, Aug 7, 11:11 AM MDT, 2 hours 2 minutes before
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Hazardous weather outlook, Aug 7, 6:18 AM MDT, 6 hours 55 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RAPID CITY SD
618 AM MDT TUE AUG 7 2012

SDZ001-002-012>014-024>032-041>044-046-047-049-072>074-WYZ054>058-
071-081300-
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-
618 AM MDT (718 AM CDT) TUE AUG 7 2012

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

.DAY ONE...TODAY AND TONIGHT

THERE IS A CHANCE FOR THUNDERSTORMS ACROSS AREA TODAY. THESE
STORMS WILL EXIT EAST OF THE AREA THIS EVENING. ORGANIZED SEVERE
WEATHER IS NOT EXPECTED AT THIS TIME...THOUGH A FEW STORMS MAY
PRODUCE GUSTY WINDS AND DRY LIGHTNING.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

THERE IS A DAILY CHANCE FOR THUNDERSTORMS THURSDAY THROUGH MONDAY
ACROSS VARYING PARTS OF THE AREA. ALTHOUGH SOME STORMS MAY
PRODUCE SMALL HAIL AND GUSTY WINDS...ORGANIZED SEVERE WEATHER IS
NOT EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY.

In the hours before

Special weather statement, Aug 7, 12:26 PM MDT, 47 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RAPID CITY SD
1226 PM MDT TUE AUG 7 2012

SDZ029-030-074-071930-
CUSTER CO PLAINS SD-HERMOSA FOOT HILLS SD-SOUTHERN BLACK HILLS SD-
1226 PM MDT TUE AUG 7 2012

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL CUSTER COUNTY UNTIL 130
PM MDT...

AT 1223 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A THUNDERSTORM NEAR CUSTER PARK GAME LODGE...OR 12 MILES EAST OF
DOWNTOWN CUSTER...MOVING EAST AT 20 MPH.

WIND GUSTS UP TO 45 MPH ARE EXPECTED WITH THIS STORM.

THIS STORM WILL BE NEAR...
FAIRBURN AROUND 1235 PM MDT.
HERMOSA AROUND 1240 PM MDT.

&&

LAT...LON 4385 10290 4364 10295 4366 10346 4383 10350
TIME...MOT...LOC 1826Z 267DEG 29KT 4376 10334

CLARK
Special weather statement, Aug 7, 12:59 PM MDT, 14 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RAPID CITY SD
1259 PM MDT TUE AUG 7 2012

SDZ029-030-074-071930-
CUSTER CO PLAINS SD-HERMOSA FOOT HILLS SD-SOUTHERN BLACK HILLS SD-
1259 PM MDT TUE AUG 7 2012

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL CUSTER COUNTY UNTIL 130
PM MDT...

AT 1257 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A STRONG THUNDERSTORM NEAR BLUE BELL...OR 10 MILES SOUTHEAST OF
DOWNTOWN CUSTER...MOVING SOUTHEAST AT 20 MPH.

WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...
  WIND CAVE VISITORS CENTER...
  FAIRBURN...
  BUFFALO GAP...

&&

LAT...LON 4369 10309 4349 10308 4348 10337 4363 10366
      4385 10345
TIME...MOT...LOC 1859Z 305DEG 16KT 4367 10343

RUDGE

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 7, 12:26 PM MDTSpecial Weather StatementUNRCuster64 min
Aug 7, 12:59 PM MDTSpecial Weather StatementUNRCuster31 min
Aug 7, 2:42 PM MDTSpecial Weather StatementUNRCuster48 min
Aug 7, 2:47 PM MDTSpecial Weather StatementUNRJackson43 min
Aug 7, 3:09 PM MDTSevere Thunderstorm WarningUNRJackson, Pennington43 min
Aug 7, 3:24 PM MDTSpecial Weather StatementUNRBennett51 min
Aug 7, 3:31 PM MDTSevere Thunderstorm WarningUNRJackson, Pennington21 min
Aug 7, 3:54 PM MDTSpecial Weather StatementUNRJackson51 min
Aug 7, 2:19 PM MDTRed Flag WarningUNR6 hr

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.