Alert archive / South Dakota / Special Weather Statements in 2012

Special Weather Statement, NWS Rapid City, SD

August 24, 2012Pennington County, South Dakota

NWS Rapid City, SD issued this special weather statement at Aug 24, 2012, 4:21 PM MDT for Pennington County, South Dakota. It was in force for 24 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: Aug 24, 2012, 4:21 PM MDT (22:21 UTC)
Expired: Aug 24, 2012, 4:45 PM MDT
In force: 24 min
Issued by: NWS Rapid City, SD

County Pennington County, SD

The radar

The Rapid City radar (KUDX), 15 km from the middle of the area, began a volume at 22:24 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

Bismarck Municip, ND (KBIS), launched 12:00Z, 10.4 hours before the alert went out and 347 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 7 J/kg
Mixed-layer CIN: -691 J/kg
Mixed-layer LCL: 2169 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: 20 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Aug 24, 2:51 PM MDT, 1 hour 30 minutes earlier.

Area forecast discussion, Aug 24, 2:51 PM MDT, 1 hour 30 minutes before

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Hazardous weather outlook, Aug 24, 6:00 AM MDT, 10 hours 21 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RAPID CITY SD
600 AM MDT FRI AUG 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-
600 AM MDT (700 AM CDT) FRI AUG 24 2012

...RED FLAG WARNING TODAY THROUGH THIS EVENING FOR THE PLAINS OF
NORTHEAST WYOMING AND THE PLAINS OF WESTERN SOUTH DAKOTA...

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

.DAY ONE...TODAY AND TONIGHT

VERY LOW RELATIVE HUMIDITIES WILL COMBINE WITH GUSTY WINDS AND A
WIND SHIFT DUE TO A PASSING COLD FRONT TO BRING CRITICAL FIRE
WEATHER CONDITIONS TO THE PLAINS OF NORTHEAST WYOMING AND THE PLAINS
OF FAR WESTERN SOUTH DAKOTA TODAY THROUGH THIS EVENING. THIS WILL
ALSO BRING EXTREME GRASSLAND FIRE DANGER TO THE WESTERN SOUTH DAKOTA
PLAINS.

ISOLATED TO SCATTERED THUNDERSTORMS WILL BE POSSIBLE THIS AFTERNOON
AND EVENING. SEVERE THUNDERSTORMS ARE NOT EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THERE IS A SLIGHT CHANCE OF THUNDERSTORMS SUNDAY NIGHT OVER SOUTH
CENTRAL AND PARTS OF SOUTHWEST SOUTH DAKOTA. SEVERE THUNDERSTORMS
ARE NOT EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY.

In the hours before

Special weather statement, Aug 24, 12:26 PM MDT, 3 hours 55 minutes before

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Special weather statement, Aug 24, 3:30 PM MDT, 51 minutes before

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Special weather statement, Aug 24, 3:49 PM MDT, 32 minutes before

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Special weather statement, Aug 24, 4:21 PM MDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 24, 4:20 AM MDT	Red Flag Warning	UNR		20 hr
Aug 24, 12:26 PM MDT	Special Weather Statement	UNR	Meade	34 min
Aug 24, 3:30 PM MDT	Special Weather Statement	UNR	Pennington	30 min
Aug 24, 3:49 PM MDT	Special Weather Statement	UNR	Pennington	26 min
Aug 24, 4:42 PM MDT	Special Weather Statement	UNR	Meade	33 min
Aug 24, 5:13 PM MDT	Special Weather Statement	UNR	Haakon	47 min
Aug 24, 5:22 PM MDT	Special Weather Statement	UNR	Jackson	38 min
Aug 24, 5:58 PM MDT	Severe Thunderstorm Warning	UNR	Jackson, Pennington	24 min

Nearby

Special Weather Statements in South Dakota, 2012 Every 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.