Alert archive / South Dakota / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 140, NWS Aberdeen, SD

September 8, 20094 counties in South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Sep 8, 2009, 5:14 PM CDT for 4 counties in South Dakota. It was in force for 46 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: Sep 8, 2009, 5:14 PM CDT (22:14 UTC)
Expired: Sep 8, 2009, 6:00 PM CDT
In force: 46 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon

Counties Brown County, SD, Edmunds County, SD, Faulk County, SD, Spink County, SD

The radar

The Aberdeen radar (KABR), 35 km from the middle of the area, began a volume at 21:57 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
Sep 8, 2:53 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 10.2 hours before the alert went out and 351 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 severe thunderstorm 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 severe thunderstorm warning went out at Sep 8, 3:44 PM CDT, 1 hour 30 minutes earlier.

Area forecast discussion, Sep 8, 3:44 PM CDT, 1 hour 30 minutes before

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Hazardous weather outlook, Sep 8, 4:24 AM CDT, 12 hours 50 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, 46 minutes before

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Local storm report, Sep 8, 4:30 PM CDT, 44 minutes before

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Local storm report, Sep 8, 4:42 PM CDT, 32 minutes before

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Special weather statement, Sep 8, 5:00 PM CDT, 14 minutes before

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Special weather statement, Sep 8, 5:12 PM CDT, 2 minutes before

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Local storm report, Sep 8, 5:14 PM CDT, 0 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, 5:16 PM CDT	Severe Thunderstorm Warning	ABR	Jones, Lyman	28 min
Sep 8, 5:18 PM CDT	Flash Flood Warning	ABR	Edmunds	4 hr
Sep 8, 6:00 PM CDT	Areal Flood Advisory	ABR	Brown, Spink	3 hr

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.