Severe Thunderstorm Warning 361, NWS Sioux Falls, SD

Issued

Aug 21, 2002, 11:41 PM CDT (04:41 UTC)

Expired

Aug 22, 2002, 12:15 AM CDT

In force

34 min

Issued by

NWS Sioux Falls, SD

Area

Counties, with a storm outline in the text

Counties Aurora County, SD, Jerauld County, SD

The Sioux Falls radar (KFSD), 166 km from the middle of the area, began a volume at 04:42 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.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

000 
WUUS53 KFSD 220441 CCA
SVRFSD
SDC003-073-220515-

BULLETIN - EAS ACTIVATION REQUESTED...CORRECTION TO INCLUDE PATHCAST
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1134 PM CDT WED AUG 21 2002

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  JERAULD COUNTY IN EAST CENTRAL SOUTH DAKOTA
  NORTHERN AURORA COUNTY IN SOUTHEAST SOUTH DAKOTA

* UNTIL 1215 AM CDT

* AT 1134 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 14 MILES SOUTHWEST OF WESSINGTON SPRINGS...OR
  ABOUT 28 MILES NORTHEAST OF CHAMBERLAIN...MOVING EAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  CROW LAKE AT 1150 PM CDT
  WHITE LAKE AT 1200 AM CDT
  PLANKINTON AT 1210 AM CDT

THIS STORM WILL PRODUCE PENNEY SIZED HAIL AND WIND GUSTS TO 65 MPH. 
GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS.

LAT...LON 4418 9892 4394 9895 4394 9880 4370 9878
          4368 9833 4418 9836

08

NWS Sioux Falls, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 21, 8:25 PM CDT, 3 hours 16 minutes earlier.

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SIOUX FALLS SD
825 PM CDT WED AUG 21 2002

SEVERE THUNDERSTORM OVER GREGORY COUNTY WEAKENING RAPIDLY WITH JUST
SOME ISOLATED THUNDERSTORMS OVER THE JAMES VALLEY. FRONT STRETCHING
FROM ABOUT VTN TO YKN TO LSE. WATER VAPOR LOOP SHOWING TWO
WAVES...ONE ACROSS CO AND ANOTHER MOVING NORTH INTO SOUTHERN SD.
THIS LIKELY HELPED SPARK THE THUNDERSTORMS BUT PROFILERS NOT SHOWING
ANY BACKING OF THE WINDS SO APPARENTLY FAIRLY WEAK. WITH THE LOW
LEVEL JET VEERED TO THE SOUTHWEST...AND EXPECTED TO VEER FURTHER TO
THE WEST...WE MAY NOT SEE A VERY EXPANSIVE AREA OF SHOWERS AND
THUNDERSTORMS TONIGHT.

WITH THE MAIN WAVE WELL OFF TO OUR WEST...WEAK SHEAR AND VERY LITTLE
LOW LEVEL FORCING EXPECTED...WILL BACK OFF TO ISOLATED TO SCATTERED
WORDING IN FORECAST PACKAGE. BELIEVE THAT THE BEST CONVECTION WILL
BE TO OUR EAST AND SOUTH OVERNIGHT.

.FSD...NONE

08

In the hours before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
721 PM CDT WED AUG 21 2002

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0715 PM    5 N DALLAS                SD   60 MPH TSTM GUST
08/21/02   GREGORY                        REPORTED BY PUBLIC.
                                          TREE BRANCHES DOWN.

Severe Thunderstorm Warnings in South Dakota, 2002Every severe thunderstorm warning in 2002

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.