Alert archive / South Dakota / Flash Flood Warnings in 2004

Flash Flood Warning 1, NWS Rapid City, SD

May 11, 2004Todd County, South Dakota

NWS Rapid City, SD issued this flash flood warning at May 11, 2004, 8:42 PM CDT for Todd 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: May 11, 2004, 8:42 PM CDT (01:42 UTC)
Expired: May 11, 2004, 11:45 PM CDT
In force: 3 hr
Issued by: NWS Rapid City, SD
Area: Counties, with a storm outline in the text

County Todd County, SD

The radar

The North Platte radar (KLNX), 138 km from the middle of the area, began a volume at 01:44 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

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 1.7 hours before the alert went out and 230 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: 1951 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 2054 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 111 m²/s²
0-3 km storm-relative helicity: 273 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.9

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 Rapid City, SD wrote its last area forecast discussion before this flash flood warning went out at May 11, 1:35 PM CDT, 7 hours 7 minutes earlier.

Area forecast discussion, May 11, 1:35 PM CDT, 7 hours 7 minutes before

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Hazardous weather outlook, May 11, 11:45 AM CDT, 8 hours 57 minutes before

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In the hours before

Special weather statement, May 11, 6:47 PM CDT, 1 hour 55 minutes before

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      <div class="status" id="status">Temporary Notice</div>
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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
May 11, 7:18 PM CDT	Severe Thunderstorm Warning	UNR	Tripp	57 min

Nearby

Flash Flood Warnings in South Dakota, 2004 Every flash flood warning in 2004

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.