Alert archive / South Dakota / Flash Flood Warnings in 2010

Flash Flood Warning 69, NWS Sioux Falls, SD

August 30, 2010Aurora County, Davison County, Sanborn County, South Dakota

NWS Sioux Falls, SD issued this flash flood warning at Aug 30, 2010, 10:33 PM CDT for Aurora County, Davison County, Sanborn County, South Dakota. It was in force for 3 hr. 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, 10:33 PM CDT (03:33 UTC)
Expired: Aug 31, 2010, 1:30 AM CDT
In force: 3 hr
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Flood severity: None

Counties Aurora County, SD, Davison County, SD, Sanborn County, SD

The radar

The Sioux Falls radar (KFSD), 126 km from the middle of the area, began a volume at 03:34 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

Aberdeen, SD (KABR), launched 00:00Z, 3.6 hours before the alert went out and 122 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 flash flood 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 flash flood warning went out at Aug 30, 8:30 PM CDT, 2 hours 3 minutes earlier.

Area forecast discussion, Aug 30, 8:30 PM CDT, 2 hours 3 minutes before

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Hazardous weather outlook, Aug 30, 10:04 AM CDT, 12 hours 29 minutes before

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In the hours before

Local storm report, Aug 30, 6:44 PM CDT, 3 hours 49 minutes before

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Local storm report, Aug 30, 7:30 PM CDT, 3 hours 3 minutes before

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Local storm report, Aug 30, 8:01 PM CDT, 2 hours 32 minutes before

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Local storm report, Aug 30, 8:23 PM CDT, 2 hours 10 minutes before

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Local storm report, Aug 30, 9:26 PM CDT, 1 hour 7 minutes before

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Local storm report, Aug 30, 9:29 PM CDT, 1 hour 4 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, 7:19 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Hutchinson, Turner, Yankton	26 min
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

Flash Flood Warnings in South Dakota, 2010 Every flash flood 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.