Alert archive / South Dakota / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 129, NWS Aberdeen, SD

August 14, 2009Buffalo County, Lyman County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Aug 14, 2009, 9:49 PM CDT for Buffalo County, Lyman County, 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 14, 2009, 9:49 PM CDT (02:49 UTC)
Expired: Aug 14, 2009, 10:15 PM CDT
In force: 26 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon

Counties Buffalo County, SD, Lyman County, SD

The radar

The Aberdeen radar (KABR), 186 km from the middle of the area, began a volume at 02:49 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 14, 4:28 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 2.8 hours before the alert went out and 135 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: 3524 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 1457 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 187 m²/s²
0-3 km storm-relative helicity: 192 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 11.9

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 Aug 14, 9:08 PM CDT, 41 minutes earlier.

Area forecast discussion, Aug 14, 9:08 PM CDT, 41 minutes before

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Hazardous weather outlook, Aug 14, 4:26 AM CDT, 17 hours 23 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ABERDEEN SD
426 AM CDT FRI AUG 14 2009

MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-151000-
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-
426 AM CDT FRI AUG 14 2009 /326 AM MDT FRI AUG 14 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

THERE IS A SLIGHT CHANCE FOR SHOWERS AND THUNDERSTORMS THIS
AFTERNOON FOR LOCATIONS ALONG AND WEST OF THE JAMES RIVER. WHILE
WIDESPREAD SEVERE WEATHER IS NOT ANTICIPATED...SOME THUNDERSTORMS
MAY BECOME STRONG WITH THE MAIN THREAT BEING SMALL HAIL AND GUSTY
WINDS.

ANOTHER ROUND OF SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE DURING
THE OVERNIGHT HOURS ACROSS THE ENTIRE AREA. DEPENDING ON THE TIME
OF THUNDERSTORM DEVELOPMENT...SOME OF THESE MAY BECOME STRONG TO
SEVERE. THE MAIN THREAT WITH INITIAL THUNDERSTORMS WILL BE LARGE
HAIL AND GUSTY WINDS. THE BEST LOCATION FOR THUNDERSTORM
DEVELOPMENT APPEARS TO BE WEST OF THE MISSOURI RIVER. THUNDERSTORMS
MAY EVOLVE INTO THE LINE OF STORMS AS THEY MOVE EAST ACROSS THE
STATE. LOCALLY HEAVY RAINFALL AND STRONG WINDS WILL BE THE MAIN
THREAT ONCE THE STORMS EVOLVE INTO THE LINE OF STORMS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THE SLOW MOVING WEATHER SYSTEM WILL CONTINUE TO TRACK ACROSS THE
NORTHERN PLAINS THROUGH THE WEEKEND. WHILE WIDESPREAD SEVERE WEATHER
IS NOT ANTICIPATED...LOCALLY HEAVY RAINFALL MAY BE POSSIBLE...ESPECIALLY
SATURDAY NIGHT.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY OR TONIGHT.

SD

In the hours before

Local storm report, Aug 14, 5:23 PM CDT, 4 hours 26 minutes before

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Local storm report, Aug 14, 7:00 PM CDT, 2 hours 49 minutes before

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Local storm report, Aug 14, 7:05 PM CDT, 2 hours 44 minutes before

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Local storm report, Aug 14, 8:10 PM CDT, 1 hour 39 minutes before

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Local storm report, Aug 14, 8:28 PM CDT, 1 hour 21 minutes before

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Local storm report, Aug 14, 9:18 PM CDT, 31 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
Aug 14, 8:43 PM CDT	Severe Thunderstorm Warning	ABR	Brown	32 min
Aug 14, 9:16 PM CDT	Severe Thunderstorm Warning	ABR	Brown	12 min

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.