Alert archive / South Dakota / Flash Flood Warnings in 2009

Flash Flood Warning 18, NWS Aberdeen, SD

September 8, 2009Edmunds County, South Dakota

NWS Aberdeen, SD issued this flash flood warning at Sep 8, 2009, 5:18 PM CDT for Edmunds County, South Dakota. It was in force for 4 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: Sep 8, 2009, 5:18 PM CDT (22:18 UTC)
Expired: Sep 8, 2009, 9:15 PM CDT
In force: 4 hr
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Flood severity: None

County Edmunds County, SD

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 10.3 hours before the alert went out and 326 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: 515 J/kg
Mixed-layer CIN: -372 J/kg
Mixed-layer LCL: 1252 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 235 m²/s²
0-3 km storm-relative helicity: 215 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 flash flood 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 flash flood warning went out at Sep 8, 3:44 PM CDT, 1 hour 34 minutes earlier.

Area forecast discussion, Sep 8, 3:44 PM CDT, 1 hour 34 minutes before

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Hazardous weather outlook, Sep 8, 4:24 AM CDT, 12 hours 54 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ABERDEEN SD
424 AM CDT TUE SEP 8 2009

MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-090930-
TRAVERSE-BIG STONE-CORSON-CAMPBELL-MCPHERSON-BROWN-MARSHALL-
ROBERTS-WALWORTH-EDMUNDS-DAY-DEWEY-POTTER-FAULK-SPINK-CLARK-
CODINGTON-GRANT-HAMLIN-DEUEL-STANLEY-SULLY-HUGHES-HYDE-HAND-JONES-
LYMAN-BUFFALO-
424 AM CDT TUE SEP 8 2009 /324 AM MDT TUE SEP 8 2009/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WEST CENTRAL
MINNESOTA...CENTRAL SOUTH DAKOTA...NORTH CENTRAL SOUTH DAKOTA AND
NORTHEAST SOUTH DAKOTA.

.DAY ONE...TODAY AND TONIGHT
SCATTERED SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE EARLY THIS
MORNING FOR LOCATIONS ALONG AND EAST OF THE JAMES RIVER VALLEY.
WHILE SEVERE WEATHER IS NOT ANTICIPATED...SOME THUNDERSTORMS MAY
PRODUCE SMALL HAIL AND GUSTY WINDS. LOCALLY HEAVY RAINFALL WILL
ALSO BE POSSIBLE.

BETTER THUNDERSTORM CHANCES EXIST LATER THIS AFTERNOON FOR THE
ENTIRE AREA AS A SLOWLY MOVING FRONTAL BOUNDARY MOVES THROUGH.
SOME THUNDERSTORMS MAY BECOME STRONG TO SEVERE WITH THE MAIN
THREAT BEING LARGE HAIL AND DAMAGING WINDS. LOCALLY HEAVY RAINFALL
WILL ALSO BE POSSIBLE. THUNDERSTORM CHANCES WILL LINGER INTO THE
OVERNIGHT HOURS...MAINLY FOR LOCATIONS ALONG AND EAST OF THE JAMES
RIVER VALLEY.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED LATER THIS AFTERNOON.

SD

In the hours before

Local storm report, Sep 8, 4:28 PM CDT, 50 minutes before

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Local storm report, Sep 8, 4:30 PM CDT, 48 minutes before

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Local storm report, Sep 8, 4:42 PM CDT, 36 minutes before

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Special weather statement, Sep 8, 5:00 PM CDT, 18 minutes before

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Special weather statement, Sep 8, 5:12 PM CDT, 6 minutes before

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Local storm report, Sep 8, 5:14 PM CDT, 4 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
Sep 8, 3:26 PM CDT	Severe Thunderstorm Warning	ABR	Edmunds, Faulk	64 min
Sep 8, 3:48 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Edmunds	42 min
Sep 8, 4:40 PM CDT	Severe Thunderstorm Warning	ABR	Edmunds	27 min
Sep 8, 5:14 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Edmunds, Faulk, Spink	46 min
Sep 8, 5:16 PM CDT	Severe Thunderstorm Warning	ABR	Jones, Lyman	28 min
Sep 8, 6:00 PM CDT	Areal Flood Advisory	ABR	Brown, Spink	3 hr

Nearby

Flash Flood Warnings in South Dakota, 2009 Every flash flood 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.