Alert archive / South Dakota / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 86, NWS Aberdeen, SD

July 9, 2009Buffalo County, Hand County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 9, 2009, 3:56 AM CDT for Buffalo County, Hand County, South Dakota. It was in force for 30 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
Jul 9, 2009, 3:56 AM CDT (08:56 UTC)
Expired
Jul 9, 2009, 4:26 AM CDT
In force
30 min
Issued by
NWS Aberdeen, SD
Area
Storm-based polygon

Counties Buffalo County, SD, Hand County, SD

The radar

The Aberdeen radar (KABR), 138 km from the middle of the area, began a volume at 08:58 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.

IssuedProductOfficeLasted
Jul 8, 9:58 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 8.9 hours before the alert went out and 86 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-pSkew-T log-p diagram, Aberdeen, SD at 00:00Z on 2009-07-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 452 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Aberdeen, SD at 00:00Z on 2009-07-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 49 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
452 J/kg
Mixed-layer CIN
-280 J/kg
Mixed-layer LCL
1286 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
49 m²/s²
0-3 km storm-relative helicity
225 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 Jul 9, 2:43 AM CDT, 1 hour 13 minutes earlier.

Area forecast discussion, Jul 9, 2:43 AM CDT, 1 hour 13 minutes before
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Hazardous weather outlook, Jul 8, 9:30 AM CDT, 18 hours 26 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ABERDEEN SD
930 AM CDT WED JUL 8 2009

MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-091430-
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-
930 AM CDT WED JUL 8 2009 /830 AM MDT WED JUL 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

THERE IS A VERY LOW CHANCE FOR THUNDERSTORMS TO DEVELOP THIS
AFTERNOON...AND THESE ARE NOT EXPECTED TO BE SEVERE.

THE FOCUS IS ON THE POTENTIAL FOR A CONVECTIVE SYSTEM TO DEVELOP
IN MONTANA AND WESTERN DAKOTAS DURING THE LATE AFTERNOON...AND
PROGRESS INTO THE CENTRAL DAKOTAS AND WEST CENTRAL MINNESOTA
DURING THE OVERNIGHT AND EARLY MORNING HOURS. A LARGE PORTION OF
THE AREA IS UNDER A MODERATE RISK FOR SEVERE WEATHER FOR THIS
EVENING AND OVERNIGHT. SUPERCELLS CAPABLE OF PRODUCING VERY LARGE
HAIL AND DAMAGING WINDS WILL BE POSSIBLE DURING THE EARLY STAGES
OF THE EVENT. SOME SUPERCELLS MAY EVEN BE CAPABLE OF PRODUCING
TORNADOES. AT THIS TIME IT APPEARS THE BEST LOCATION OF SUPERCELL
DEVELOPMENT IS ALONG AND WEST OF THE MISSOURI RIVER. SUPERCELLS
MAY EVOLVE INTO A LINE OF STORMS WITH DESTRUCTIVE WINDS BEING THE
MAIN THREAT. AT THIS TIME THE BEST LOCATION FOR WIDESPREAD
DAMAGING WINDS WILL BE ALONG AND NORTH OF HIGHWAY 12.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THERE IS A LOW CHANCE FOR THUNDERSTORM ACTIVITY FRIDAY...AND AGAIN
FOR THE START OF NEXT WEEK. AT THIS TIME IT REMAINS UNCERTAIN IF
THERE IS A THREAT ANY OF THESE STORMS COULD BE SEVERE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED LATE THIS EVENING AND OVERNIGHT.

SD

In the hours before

Local storm report, Jul 8, 10:16 PM CDT, 5 hours 40 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
1016 PM CDT WED JUL 08 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1011 PM     HAIL             1 W GETTYSBURG          45.01N 99.97W
07/08/2009  E0.50 INCH       POTTER             SD   TRAINED SPOTTER

            ALSO ESTIMATED WIND GUSTS OF 40 MPH.

1008 PM     HAIL             13 W GETTYSBURG         45.01N 100.22W
07/08/2009  E0.88 INCH       POTTER             SD   TRAINED SPOTTER

&&

WFOABR
Local storm report, Jul 9, 1:31 AM CDT, 2 hours 25 minutes before
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Local storm report, Jul 9, 2:02 AM CDT, 1 hour 54 minutes before
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Local storm report, Jul 9, 2:19 AM CDT, 1 hour 37 minutes before
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Local storm report, Jul 9, 3:23 AM CDT, 33 minutes before
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Local storm report, Jul 9, 3:27 AM CDT, 29 minutes before
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The office that day

Everything else NWS Aberdeen, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 8, 9:14 PM CDTSevere Thunderstorm WarningABRCorson, Dewey61 min
Jul 8, 9:19 PM CDTSevere Thunderstorm WarningABRHyde, Potter, Sully41 min
Jul 8, 9:40 PM CDTSevere Thunderstorm WarningABRDewey, Faulk, Potter, Sully, Walworth65 min
Jul 8, 10:02 PM CDTSevere Thunderstorm WarningABRCorson, Dewey26 min
Jul 8, 10:04 PM CDTSevere Thunderstorm WarningABRCampbell, McPherson41 min
Jul 8, 10:23 PM CDTSevere Thunderstorm WarningABRCorson, Dewey52 min
Jul 8, 10:36 PM CDTSevere Thunderstorm WarningABRFaulk, Hand, Hyde, Potter39 min
Jul 8, 10:44 PM CDTSevere Thunderstorm WarningABREdmunds, Faulk, Potter, Sully34 min
Jul 8, 11:01 PM CDTTornado WarningABRFaulk, Hand, Hyde, Potter, Sully29 min
Jul 8, 11:11 PM CDTSevere Thunderstorm WarningABRCorson, Dewey64 min
Jul 8, 11:52 PM CDTSevere Thunderstorm WarningABRCorson, Dewey53 min
Jul 9, 12:13 AM CDTSevere Thunderstorm WarningABRCorson, Dewey32 min
Jul 9, 12:35 AM CDTSevere Thunderstorm WarningABRCampbell, Corson, Dewey, McPherson, Potter, Walworth42 min
Jul 9, 1:18 AM CDTSevere Thunderstorm WarningABRClark42 min
Jul 9, 1:52 AM CDTSevere Thunderstorm WarningABRClark, Codington53 min
Jul 9, 2:22 AM CDTSevere Thunderstorm WarningABRHand, Hughes, Hyde, Sully38 min
Jul 9, 2:54 AM CDTSevere Thunderstorm WarningABRBuffalo, Faulk, Hand, Hughes, Hyde, Spink51 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2009Every 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.