Alert archive / South Dakota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 293, NWS Rapid City, SD

August 1, 2011Butte County, Meade County, Perkins County, South Dakota

NWS Rapid City, SD issued this severe thunderstorm warning at Aug 1, 2011, 2:28 PM MDT for Butte County, Meade County, Perkins County, South Dakota. It was in force for 62 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
Aug 1, 2011, 2:28 PM MDT (20:28 UTC)
Expired
Aug 1, 2011, 3:30 PM MDT
In force
62 min
Issued by
NWS Rapid City, SD
Area
Storm-based polygon
Hail
1.75 in
Wind
60.0 mph

Counties Butte County, SD, Meade County, SD, Perkins County, SD

The radar

The Rapid City radar (KUDX), 96 km from the middle of the area, began a volume at 20:29 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
Mar 3, 10:24 PM MSTSevere Thunderstorm WatchSPC157 days
Aug 1, 1:19 PM MDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 8.5 hours before the alert went out and 102 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 12:00Z on 2011-08-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 43 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 12:00Z on 2011-08-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -43 square meters per square second.1939Sfc1 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
43 J/kg
Mixed-layer CIN
-335 J/kg
Mixed-layer LCL
2966 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
-43 m²/s²
0-3 km storm-relative helicity
28 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 Aug 1, 2:15 PM MDT, 13 minutes earlier.

Area forecast discussion, Aug 1, 2:15 PM MDT, 13 minutes before
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Hazardous weather outlook, Aug 1, 5:15 AM MDT, 9 hours 13 minutes before
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In the hours before

Local storm report, Aug 1, 1:18 PM MDT, 1 hour 10 minutes before
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Local storm report, Aug 1, 1:30 PM MDT, 58 minutes before
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Local storm report, Aug 1, 1:37 PM MDT, 51 minutes before
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Local storm report, Aug 1, 1:41 PM MDT, 47 minutes before
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Local storm report, Aug 1, 2:23 PM MDT, 5 minutes before
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Local storm report, Aug 1, 2:24 PM MDT, 4 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 31, 6:23 PM MDTSevere Thunderstorm WarningUNRPerkins67 min
Jul 31, 6:30 PM MDTSevere Thunderstorm WarningUNRPerkins60 min
Jul 31, 6:52 PM MDTSevere Thunderstorm WarningUNRPerkins53 min
Jul 31, 6:59 PM MDTSevere Thunderstorm WarningUNRMeade61 min
Jul 31, 7:41 PM MDTSevere Thunderstorm WarningUNRPerkins34 min
Jul 31, 9:42 PM MDTSevere Thunderstorm WarningUNRPerkins, Ziebach51 min
Aug 1, 12:38 PM MDTSevere Thunderstorm WarningUNRHarding36 min
Aug 1, 1:03 PM MDTSevere Thunderstorm WarningUNRHarding42 min
Aug 1, 1:06 PM MDTSevere Thunderstorm WarningUNRButte, Harding54 min
Aug 1, 1:21 PM MDTSevere Thunderstorm WarningUNRPerkins20 min
Aug 1, 1:54 PM MDTSevere Thunderstorm WarningUNRButte, Harding66 min
Aug 1, 3:21 PM MDTSevere Thunderstorm WarningUNRMeade, Perkins54 min
Aug 1, 4:02 PM MDTSevere Thunderstorm WarningUNRMeade, Perkins, Ziebach73 min
Aug 1, 4:29 PM MDTSevere Thunderstorm WarningUNRButte, Meade61 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2011Every 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.