Alert archive / South Dakota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 152, NWS Rapid City, SD

June 30, 2011Butte County, Harding County, South Dakota

NWS Rapid City, SD issued this severe thunderstorm warning at Jun 30, 2011, 9:03 PM MDT for Butte County, Harding County, South Dakota. It was in force for 57 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: Jun 30, 2011, 9:03 PM MDT (03:03 UTC)
Expired: Jun 30, 2011, 10:00 PM MDT
In force: 57 min
Issued by: NWS Rapid City, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Butte County, SD, Harding County, SD

The radar

The Rapid City radar (KUDX), 135 km from the middle of the area, began a volume at 03:05 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.

Issued	Product	Office	Lasted
Mar 3, 10:24 PM MST	Severe Thunderstorm Watch	SPC	157 days

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 3.1 hours before the alert went out and 139 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: 1264 J/kg
Mixed-layer CIN: -118 J/kg
Mixed-layer LCL: 1434 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 209 m²/s²
0-3 km storm-relative helicity: 273 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 24.7

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 Jun 30, 8:45 PM MDT, 18 minutes earlier.

Area forecast discussion, Jun 30, 8:45 PM MDT, 18 minutes before

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Hazardous weather outlook, Jun 30, 2:21 PM MDT, 6 hours 42 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RAPID CITY SD
221 PM MDT THU JUN 30 2011

SDZ001-002-012>014-024>032-041>044-046-047-049-072>074-WYZ054>058-
071-011300-
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-
221 PM MDT (321 PM CDT) THU JUN 30 2011

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

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS WILL DEVELOP ACROSS THE AREA LATE TODAY AND TONIGHT AS
AN UPPER LEVEL SYSTEM APPROACHES THE AREA. THERE IS A SLIGHT RISK OF
SEVERE STORMS DURING THE LATE AFTERNOON AND EVENING ACROSS
NORTHEASTERN WYOMING AND WESTERN AND SOUTH CENTRAL SOUTH DAKOTA.
STRONG WIND GUSTS WILL BE THE BIGGEST THREAT FROM ANY SEVERE
STORMS...BUT LARGE HAIL IS ALSO POSSIBLE. HEAVY RAINFALL IS ALSO
LIKELY WITH SOME STORMS.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

ISOLATED THUNDERSTORMS CAN BE EXPECTED ACROSS THE AREA ON FRIDAY...
ESPECIALLY SOUTH AND EAST OF THE BLACK HILLS. SEVERE STORMS ARE NOT
EXPECTED AT THIS TIME.

THERE WILL BE A CHANCE FOR THUNDERSTORMS ACROSS THE AREA SATURDAY
INTO SATURDAY NIGHT. WIDESPREAD SEVERE STORMS ARE NOT EXPECTED AT
THIS TIME...BUT A FEW STORMS COULD BE STRONG TO SEVERE...ESPECIALLY
ACROSS THE BLACK HILLS AREA.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED TODAY.

In the hours before

Local storm report, Jun 30, 8:33 PM MDT, 30 minutes before

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Local storm report, Jun 30, 8:38 PM MDT, 25 minutes before

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Local storm report, Jun 30, 8:40 PM MDT, 23 minutes before

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Local storm report, Jun 30, 8:59 PM MDT, 4 minutes before

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Local storm report, Jun 30, 9:00 PM MDT, 3 minutes before

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Local storm report, Jun 30, 9:03 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
Jun 30, 6:37 PM MDT	Flash Flood Warning	UNR		3 hr
Jun 30, 7:31 PM MDT	Severe Thunderstorm Warning	UNR	Bennett, Todd	59 min
Jun 30, 8:14 PM MDT	Severe Thunderstorm Warning	UNR	Mellette, Todd, Tripp	61 min
Jun 30, 8:46 PM MDT	Severe Thunderstorm Warning	UNR	Tripp	29 min
Jun 30, 8:53 PM MDT	Severe Thunderstorm Warning	UNR	Mellette	52 min
Jun 30, 9:09 PM MDT	Severe Thunderstorm Warning	UNR	Mellette, Tripp	41 min
Jul 1, 9:33 AM MDT	Severe Thunderstorm Warning	UNR	Tripp	51 min
Jul 1, 2:13 PM MDT	Flash Flood Warning	UNR	Butte	3 hr
Jun 30, 6:43 PM MDT	Severe Thunderstorm Warning	UNR	Campbell	47 min
Jun 30, 7:13 PM MDT	Severe Thunderstorm Warning	UNR	Crook	62 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2011 Every severe thunderstorm warning in 2011

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.