Alert archive / South Dakota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 227, NWS Rapid City, SD

August 1, 2012Bennett County, South Dakota

NWS Rapid City, SD issued this severe thunderstorm warning at Aug 1, 2012, 2:34 PM MDT for Bennett County, South Dakota. It was in force for 18 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, 2012, 2:34 PM MDT (20:34 UTC)
Expired: Aug 1, 2012, 2:52 PM MDT
In force: 18 min
Issued by: NWS Rapid City, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Bennett County, SD

The radar

The Rapid City radar (KUDX), 140 km from the middle of the area, began a volume at 20:36 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
Aug 1, 2:19 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 8.6 hours before the alert went out and 138 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: 22 J/kg
Mixed-layer CIN: -312 J/kg
Mixed-layer LCL: 3117 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 49 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, 2:04 PM MDT, 30 minutes earlier.

Area forecast discussion, Aug 1, 2:04 PM MDT, 30 minutes before

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Hazardous weather outlook, Aug 1, 4:09 AM MDT, 10 hours 25 minutes before

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In the hours before

Special weather statement, Aug 1, 12:31 PM MDT, 2 hours 3 minutes before

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Special weather statement, Aug 1, 12:58 PM MDT, 1 hour 36 minutes before

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Special weather statement, Aug 1, 1:23 PM MDT, 1 hour 11 minutes before

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Special weather statement, Aug 1, 1:44 PM MDT, 50 minutes before

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Local storm report, Aug 1, 2:13 PM MDT, 21 minutes before

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Special weather statement, Aug 1, 2:13 PM MDT, 21 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 1, 12:31 PM MDT	Special Weather Statement	UNR	Custer	29 min
Aug 1, 12:58 PM MDT	Special Weather Statement	UNR	Pennington	32 min
Aug 1, 1:23 PM MDT	Special Weather Statement	UNR	Haakon	37 min
Aug 1, 1:27 PM MDT	Severe Thunderstorm Warning	UNR	Haakon, Pennington	63 min
Aug 1, 1:44 PM MDT	Special Weather Statement	UNR	Haakon	31 min
Aug 1, 1:50 PM MDT	Severe Thunderstorm Warning	UNR	Haakon, Jackson	73 min
Aug 1, 2:13 PM MDT	Special Weather Statement	UNR	Bennett	32 min
Aug 1, 2:37 PM MDT	Severe Thunderstorm Warning	UNR	Jackson, Mellette	43 min
Aug 1, 3:09 PM MDT	Special Weather Statement	UNR	Bennett	36 min
Aug 1, 4:10 PM MDT	Special Weather Statement	UNR	Todd	35 min
Aug 1, 4:54 PM MDT	Special Weather Statement	UNR	Tripp	36 min
Aug 1, 1:53 PM MDT	Fire Weather Watch	UNR		15 hr

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.