Alert archive / South Dakota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 216, NWS Rapid City, SD

July 24, 2012Meade County, Perkins County, Ziebach County, South Dakota

NWS Rapid City, SD issued this severe thunderstorm warning at Jul 24, 2012, 11:56 PM MDT for Meade County, Perkins County, Ziebach County, South Dakota. It was in force for 64 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 24, 2012, 11:56 PM MDT (05:56 UTC)
Expired
Jul 25, 2012, 1:00 AM MDT
In force
64 min
Issued by
NWS Rapid City, SD
Area
Storm-based polygon
Hail
1.0 in
Wind
75.0 mph

Counties Meade County, SD, Perkins County, SD, Ziebach County, SD

The radar

The Rapid City radar (KUDX), 108 km from the middle of the area, began a volume at 05:55 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jul 24, 7:01 PM MDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 5.9 hours before the alert went out and 115 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 00:00Z on 2012-07-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 260 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, Rapid City, SD at 00:00Z on 2012-07-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 125 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
260 J/kg
Mixed-layer CIN
-280 J/kg
Mixed-layer LCL
2222 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
125 m²/s²
0-3 km storm-relative helicity
303 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.1

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 Jul 24, 11:44 PM MDT, 12 minutes earlier.

Area forecast discussion, Jul 24, 11:44 PM MDT, 12 minutes before
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Hazardous weather outlook, Jul 24, 4:53 AM MDT, 19 hours 3 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RAPID CITY SD
453 AM MDT TUE JUL 24 2012

SDZ001-002-012>014-024>032-041>044-046-047-049-072>074-WYZ054>058-
071-251300-
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-
453 AM MDT (553 AM CDT) TUE JUL 24 2012

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

.DAY ONE...TODAY AND TONIGHT

SCATTERED THUNDERSTORMS WILL DEVELOP OVER NORTHEASTERN WYOMING AND
WESTERN SOUTH DAKOTA THIS AFTERNOON AND SPREAD EAST THIS EVENING.
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS WESTERN AND
SOUTH CENTRAL SOUTH DAKOTA THIS AFTERNOON AND EVENING...AS WELL AS
THE SUNDANCE AND NEWCASTLE AREAS OF NORTHEAST WYOMING. THE MAIN
THREAT WILL BE LARGE HAIL AND DAMAGING WIND GUSTS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

SCATTERED THUNDERSTORMS ARE POSSIBLE ON WEDNESDAY. SEVERE
THUNDERSTORMS ARE NOT EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED TODAY.

In the hours before

Local storm report, Jul 24, 9:03 PM MDT, 2 hours 53 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
903 PM MDT TUE JUL 24 2012

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

0809 PM     TSTM WND GST     18 S DOWNTOWN NEWCASTLE 43.60N 104.15W
07/24/2012  M62 MPH          WESTON             WY   MESONET

            RAWS SITE

&&

JC
Local storm report, Jul 24, 9:05 PM MDT, 2 hours 51 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
905 PM MDT TUE JUL 24 2012

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

0855 PM     TSTM WND GST     13 NNE WRIGHT           43.93N 105.45W
07/24/2012  M58 MPH          CAMPBELL           WY   DEPT OF HIGHWAYS

&&

JC
Local storm report, Jul 24, 10:31 PM MDT, 1 hour 25 minutes before
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Local storm report, Jul 24, 11:14 PM MDT, 42 minutes before
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Local storm report, Jul 24, 11:17 PM MDT, 39 minutes before
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Local storm report, Jul 24, 11:24 PM MDT, 32 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 24, 7:10 PM MDTSpecial Weather StatementUNRHaakon50 min
Jul 24, 7:17 PM MDTSevere Thunderstorm WarningUNRHaakon, Jackson58 min
Jul 24, 7:19 PM MDTSpecial Weather StatementUNRFall River26 min
Jul 24, 7:35 PM MDTSpecial Weather StatementUNRLawrence25 min
Jul 24, 7:57 PM MDTSpecial Weather StatementUNRCuster33 min
Jul 24, 7:59 PM MDTSpecial Weather StatementUNRHaakon46 min
Jul 24, 8:05 PM MDTSevere Thunderstorm WarningUNRHaakon, Jackson, Ziebach39 min
Jul 24, 8:42 PM MDTSevere Thunderstorm WarningUNRCuster, Pennington63 min
Jul 24, 8:51 PM MDTSevere Thunderstorm WarningUNRHarding54 min
Jul 24, 9:11 PM MDTSevere Thunderstorm WarningUNRCuster, Pennington64 min
Jul 24, 10:33 PM MDTSevere Thunderstorm WarningUNRMeade, Pennington57 min
Jul 24, 10:40 PM MDTSevere Thunderstorm WarningUNRButte, Lawrence65 min
Jul 24, 11:02 PM MDTSevere Thunderstorm WarningUNRMeade, Perkins, Ziebach58 min
Jul 24, 11:39 PM MDTSevere Thunderstorm WarningUNRHaakon, Ziebach96 min
Jul 25, 12:23 PM MDTSpecial Weather StatementUNRPennington52 min
Jul 25, 1:06 PM MDTSpecial Weather StatementUNRPennington39 min
Jul 25, 1:17 PM MDTSpecial Weather StatementUNRCuster43 min
Jul 25, 1:41 PM MDTSpecial Weather StatementUNRPennington49 min
Jul 25, 1:53 PM MDTSpecial Weather StatementUNROglala Lakota37 min
Jul 25, 2:47 PM MDTSpecial Weather StatementUNRCuster43 min
Jul 25, 4:31 PM MDTSpecial Weather StatementUNRMellette, Todd59 min
Jul 25, 5:21 PM MDTSpecial Weather StatementUNRTodd, Tripp54 min
Jul 24, 8:27 PM MDTSpecial Weather StatementUNRWeston48 min
Jul 24, 8:48 PM MDTSevere Thunderstorm WarningUNRCampbell, Crook, Weston57 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.