Alert archive / South Dakota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 11, NWS Rapid City, SD

May 4, 2012Mellette County, Tripp County, South Dakota

NWS Rapid City, SD issued this severe thunderstorm warning at May 4, 2012, 9:42 AM CDT for Mellette County, Tripp County, South Dakota. It was in force for 93 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: May 4, 2012, 9:42 AM CDT (14:42 UTC)
Expired: May 4, 2012, 11:15 AM CDT
In force: 93 min
Issued by: NWS Rapid City, SD
Area: Storm-based polygon
Hail: 1.75 in
Wind: 50.0 mph

Counties Mellette County, SD, Tripp County, SD

The radar

The North Platte radar (KLNX), 169 km from the middle of the area, began a volume at 14:45 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, 2.7 hours before the alert went out and 260 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: 1902 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 750 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 88 m²/s²
0-3 km storm-relative helicity: 198 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.1

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 May 4, 4:19 AM CDT, 5 hours 23 minutes earlier.

Area forecast discussion, May 4, 4:19 AM CDT, 5 hours 23 minutes before

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Hazardous weather outlook, May 4, 3:48 AM CDT, 5 hours 54 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RAPID CITY SD
248 AM MDT FRI MAY 4 2012

SDZ001-002-012>014-024>032-041>044-046-047-049-072>074-WYZ054>058-
071-051400-
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-
248 AM MDT (348 AM CDT) FRI MAY 4 2012

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

.DAY ONE...TODAY AND TONIGHT

THERE IS A CHANCE OF SHOWERS AND THUNDERSTORMS ACROSS  THE
FORECAST AREA THIS AFTERNOON THROUGH TONIGHT.

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER SOUTH CENTRAL
SOUTH DAKOTA THIS AFTERNOON AND EVENING WITH STRONG WIND GUSTS AND
LARGE HAIL POSSIBLE.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THERE IS A CHANCE OF THUNDERSTORMS AGAIN ON SATURDAY AND SATURDAY
NIGHT...BUT WIDESPREAD SEVERE STORMS ARE NOT EXPECTED.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY.

In the hours before

Special weather statement, May 4, 4:18 AM CDT, 5 hours 24 minutes before

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Special weather statement, May 4, 5:01 AM CDT, 4 hours 41 minutes before

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Special weather statement, May 4, 6:36 AM CDT, 3 hours 6 minutes before

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Special weather statement, May 4, 8:15 AM CDT, 1 hour 27 minutes before

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Special weather statement, May 4, 8:49 AM CDT, 53 minutes before

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Local storm report, May 4, 9:39 AM CDT, 3 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
May 4, 3:32 AM CDT	Special Weather Statement	UNR	Jackson	43 min
May 4, 4:18 AM CDT	Special Weather Statement	UNR	Bennett	42 min
May 4, 5:01 AM CDT	Special Weather Statement	UNR	Jackson	44 min
May 4, 5:04 AM CDT	Severe Thunderstorm Warning	UNR	Bennett, Jackson	38 min
May 4, 5:32 AM CDT	Severe Thunderstorm Warning	UNR	Jackson, Mellette, Todd	58 min
May 4, 6:28 AM CDT	Severe Thunderstorm Warning	UNR	Mellette, Todd, Tripp	62 min
May 4, 6:36 AM CDT	Special Weather Statement	UNR	Jackson	39 min
May 4, 7:16 AM CDT	Severe Thunderstorm Warning	UNR	Tripp	26 min
May 4, 8:15 AM CDT	Special Weather Statement	UNR	Mellette	45 min
May 4, 8:49 AM CDT	Special Weather Statement	UNR	Mellette	41 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2012 Every 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.