Alert archive / South Dakota / Special Weather Statements in 2012

Special Weather Statement, NWS Rapid City, SD

July 25, 2012Todd County, Tripp County, South Dakota

NWS Rapid City, SD issued this special weather statement at Jul 25, 2012, 6:21 PM CDT for Todd County, Tripp County, South Dakota. It was in force for 54 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jul 25, 2012, 6:21 PM CDT (23:21 UTC)
Expired
Jul 25, 2012, 7:15 PM CDT
In force
54 min
Issued by
NWS Rapid City, SD

Counties Todd County, SD, Tripp County, SD

The radar

The North Platte radar (KLNX), 164 km from the middle of the area, began a volume at 23:20 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

Aberdeen, SD (KABR), launched 12:00Z, 11.4 hours before the alert went out and 211 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, Aberdeen, SD at 12:00Z on 2012-07-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1286 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, Aberdeen, SD at 12:00Z on 2012-07-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -197 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
1286 J/kg
Mixed-layer CIN
-146 J/kg
Mixed-layer LCL
794 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
-197 m²/s²
0-3 km storm-relative helicity
-14 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 25, 3:10 PM CDT, 3 hours 11 minutes earlier.

Area forecast discussion, Jul 25, 3:10 PM CDT, 3 hours 11 minutes before
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Hazardous weather outlook, Jul 25, 6:19 AM CDT, 12 hours 2 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RAPID CITY SD
519 AM MDT WED JUL 25 2012

SDZ001-002-012>014-024>032-041>044-046-047-049-072>074-WYZ054>058-
071-261300-
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-
519 AM MDT (619 AM CDT) WED JUL 25 2012

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

.DAY ONE...TODAY AND TONIGHT

SCATTERED THUNDERSTORMS WILL OCCUR ACROSS NORTHEAST WYOMING AND
SOUTHWEST TO SOUTH CENTRAL SOUTH DAKOTA THIS AFTERNOON AND
EVENING. SEVERE THUNDERSTORMS ARE NOT EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THERE IS A SLIGHT CHANCE OF THUNDERSTORMS FRIDAY THROUGH TUESDAY.
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, Jul 25, 3:47 PM CDT, 2 hours 34 minutes before
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Local storm report, Jul 25, 5:06 PM CDT, 1 hour 15 minutes before
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Local storm report, Jul 25, 5:26 PM CDT, 55 minutes before
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Local storm report, Jul 25, 5:27 PM CDT, 54 minutes before
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Special weather statement, Jul 25, 5:31 PM CDT, 50 minutes before
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Special weather statement, Jul 25, 6:21 PM CDT, 0 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, 8:10 PM CDTSpecial Weather StatementUNRHaakon50 min
Jul 24, 8:17 PM CDTSevere Thunderstorm WarningUNRHaakon, Jackson58 min
Jul 24, 8:19 PM CDTSpecial Weather StatementUNRFall River26 min
Jul 24, 8:35 PM CDTSpecial Weather StatementUNRLawrence25 min
Jul 24, 8:57 PM CDTSpecial Weather StatementUNRCuster33 min
Jul 24, 8:59 PM CDTSpecial Weather StatementUNRHaakon46 min
Jul 24, 9:05 PM CDTSevere Thunderstorm WarningUNRHaakon, Jackson, Ziebach39 min
Jul 24, 9:42 PM CDTSevere Thunderstorm WarningUNRCuster, Pennington63 min
Jul 24, 9:51 PM CDTSevere Thunderstorm WarningUNRHarding54 min
Jul 24, 10:11 PM CDTSevere Thunderstorm WarningUNRCuster, Pennington64 min
Jul 24, 11:33 PM CDTSevere Thunderstorm WarningUNRMeade, Pennington57 min
Jul 24, 11:40 PM CDTSevere Thunderstorm WarningUNRButte, Lawrence65 min
Jul 25, 12:02 AM CDTSevere Thunderstorm WarningUNRMeade, Perkins, Ziebach58 min
Jul 25, 12:39 AM CDTSevere Thunderstorm WarningUNRHaakon, Ziebach96 min
Jul 25, 12:56 AM CDTSevere Thunderstorm WarningUNRMeade, Perkins, Ziebach64 min
Jul 25, 1:23 PM CDTSpecial Weather StatementUNRPennington52 min
Jul 25, 2:06 PM CDTSpecial Weather StatementUNRPennington39 min
Jul 25, 2:17 PM CDTSpecial Weather StatementUNRCuster43 min
Jul 25, 2:41 PM CDTSpecial Weather StatementUNRPennington49 min
Jul 25, 2:53 PM CDTSpecial Weather StatementUNROglala Lakota37 min
Jul 25, 3:47 PM CDTSpecial Weather StatementUNRCuster43 min
Jul 25, 5:31 PM CDTSpecial Weather StatementUNRMellette, Todd59 min
Jul 24, 9:27 PM CDTSpecial Weather StatementUNRWeston48 min
Jul 24, 9:48 PM CDTSevere Thunderstorm WarningUNRCampbell, Crook, Weston57 min

Nearby

Special Weather Statements in South Dakota, 2012Every special weather statement 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.