Alert archive / South Dakota / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 132, NWS Aberdeen, SD

July 3, 2007Corson County, Dewey County, Walworth County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 3, 2007, 3:57 AM MDT for Corson County, Dewey County, Walworth County, South Dakota. It was in force for 48 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: Jul 3, 2007, 3:57 AM MDT (09:57 UTC)
Expired: Jul 3, 2007, 4:45 AM MDT
In force: 48 min
Issued by: NWS Aberdeen, SD
Area: Counties, with a storm outline in the text

Counties Corson County, SD, Dewey County, SD, Walworth County, SD

The radar

The Bismarck radar (KBIS), 149 km from the middle of the area, began a volume at 09:59 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
Jul 3, 1:21 AM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 10.0 hours before the alert went out and 149 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: 1417 J/kg
Mixed-layer CIN: -76 J/kg
Mixed-layer LCL: 1562 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: -14 m²/s²
0-3 km storm-relative helicity: 40 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 Aberdeen, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 2, 2:23 PM MDT, 13 hours 34 minutes earlier.

Area forecast discussion, Jul 2, 2:23 PM MDT, 13 hours 34 minutes before

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Hazardous weather outlook, Jul 2, 5:18 AM MDT, 22 hours 39 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 3, 4:46 AM MDT	Severe Thunderstorm Warning	ABR	Dewey, Potter, Walworth	44 min
Jul 3, 5:25 AM MDT	Severe Thunderstorm Warning	ABR	Faulk, Hand, Hyde, Potter, Sully	65 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2007 Every severe thunderstorm warning in 2007

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.