Alert archive / South Dakota / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 261, NWS Sioux Falls, SD

August 30, 20104 counties in South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 30, 2010, 7:19 PM CDT for 4 counties in South Dakota. It was in force for 26 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 30, 2010, 7:19 PM CDT (00:19 UTC)
Expired: Aug 30, 2010, 7:45 PM CDT
In force: 26 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

Counties Bon Homme County, SD, Hutchinson County, SD, Turner County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 81 km from the middle of the area, began a volume at 00:21 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 30, 3:23 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 30, 6:44 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 0.3 hours before the alert went out and 205 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: 875 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 1007 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 147 m²/s²
0-3 km storm-relative helicity: 179 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 4.2

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 Sioux Falls, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 30, 3:13 PM CDT, 4 hours 6 minutes earlier.

Area forecast discussion, Aug 30, 3:13 PM CDT, 4 hours 6 minutes before

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Hazardous weather outlook, Aug 30, 10:04 AM CDT, 9 hours 15 minutes before

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In the hours before

Local storm report, Aug 30, 5:32 PM CDT, 1 hour 47 minutes before

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Local storm report, Aug 30, 6:29 PM CDT, 50 minutes before

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Local storm report, Aug 30, 6:44 PM CDT, 35 minutes before

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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
Aug 30, 7:07 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Davison, Hanson, Sanborn	23 min
Aug 30, 10:33 PM CDT	Flash Flood Warning	FSD	Aurora, Davison, Sanborn	3 hr
Aug 31, 4:13 PM CDT	Severe Thunderstorm Warning	FSD	Buena Vista	47 min
Aug 30, 10:24 PM CDT	Severe Thunderstorm Warning	FSD	Murray, Pipestone	36 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2010 Every severe thunderstorm warning in 2010

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.