Alert archive / South Dakota / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 161, NWS Sioux Falls, SD

July 12, 2009Beadle County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 12, 2009, 6:35 AM CDT for Beadle County, South Dakota. It was in force for 25 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 12, 2009, 6:35 AM CDT (11:35 UTC)
Expired: Jul 12, 2009, 7:00 AM CDT
In force: 25 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon

County Beadle County, SD

The radar

The Aberdeen radar (KABR), 116 km from the middle of the area, began a volume at 11:39 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

Bismarck Municip, ND (KBIS), launched 00:00Z, 11.6 hours before the alert went out and 323 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: 18 J/kg
Mixed-layer CIN: -156 J/kg
Mixed-layer LCL: 1635 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 169 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 Sioux Falls, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 12, 4:45 AM CDT, 1 hour 50 minutes earlier.

Area forecast discussion, Jul 12, 4:45 AM CDT, 1 hour 50 minutes before

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Hazardous weather outlook, Jul 12, 4:58 AM CDT, 1 hour 37 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 6:27 AM CDT	Severe Thunderstorm Warning	FSD	Lake, McCook, Miner	33 min
Jul 12, 6:59 AM CDT	Severe Thunderstorm Warning	FSD	Beadle, Davison, Hanson, Kingsbury, Miner, Sanborn	46 min
Jul 12, 7:33 AM CDT	Severe Thunderstorm Warning	FSD	Lincoln, McCook, Minnehaha, Turner	42 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2009 Every severe thunderstorm warning in 2009

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.