Severe Thunderstorm Warning 235, NWS Sioux Falls, SD

Issued

Aug 3, 2002, 5:46 PM CDT (22:46 UTC)

Expired

Aug 3, 2002, 6:30 PM CDT

In force

44 min

Issued by

NWS Sioux Falls, SD

Area

Counties, with a storm outline in the text

County Moody County, SD

The Sioux Falls radar (KFSD), 53 km from the middle of the area, began a volume at 22:47 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.

509 
WUUS53 KFSD 032246
SVRFSD
SDC101-032330-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
546 PM CDT SAT AUG 3 2002

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MOODY COUNTY IN EAST CENTRAL SOUTH DAKOTA

* UNTIL 630 PM CDT

* AT 546 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 8 MILES NORTHWEST OF COLMAN...OR ABOUT 8 MILES
  EAST OF MADISON...MOVING EAST AT 45 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  TRENT AROUND 600 PM CDT
  EGAN AROUND 605 PM CDT
  FLANDREAU AROUND 610 PM CDT

THIS STORM WILL PRODUCE DAMAGING WIND. GO INSIDE A STURDY BUILDING
AND STAY AWAY FROM WINDOWS.

A TORNADO WATCH IS ALSO IN EFFECT FOR THE AREA. SEVERE THUNDERSTORMS
CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. PREPARE TO
MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE SUCH AS A BASEMENT OR
SMALL INTERIOR ROOM IF A TORNADO IS SPOTTED.

LAT...LON 4419 9688 4386 9685 4390 9651 4419 9649

NWS Sioux Falls, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 3, 3:05 PM CDT, 2 hours 41 minutes earlier.

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SIOUX FALLS SD
305 PM CDT SAT AUG 3 2002

PRELIMS WILL PROBABLY BE A LITTLE LATE AS THEY HASH OUT THE WATCH
BOX. MAIN PROBLEMS WITH FCST PKG IS IN THE SHORT TERM TNGT. WELL
ADVERTISED SFC TROF AND LOW PRES NOW TO THE EAST OF KPIR. IT LOOKS
LIKE THE 12Z ETA/MESO ETA IS WAY TOO FAST...AND PREFER THE OLDER
RUNS OF THE ETA/THE 12Z AVN AND RUC FOR FRONTAL TIMING. PLENTY OF
WAA AND JUICED UP SFC AIR HAS RETURNED TO THE FSD CWA...WITH MANY
LOCATIONS WELL INTO THE 90S...REACHING CONVECTIVE TEMPS. WIND SHEAR
BECOMES LIMITED IN TIME...AS PROFILES SHOW MORE OF A UNIDIRECTIONAL
FLOW THIS EVENING AS WELL AS SPEEDS WHICH ARE RATHER UNIFORM.
STILL...INSTABILITY IS HIGH ENUF THAT ONE CANNOT RULE OUT SVR WX
EARLY THIS EVENING...AND WELL WORD ACCORDINGLY. SO FAR...THE TS IS
STRAIGHT UP AND DOWN IN THE WRN CWA BUT THAT MAY CHANGE. MORE
CONCERNED ABOUT A HEAVY RAIN THREAT WITH SOME TRAINING ECHOES. THE
FIRST WAVE WHICH IS NOW WELL INTO MN IS SHOWING SOME HANGBACK
FEATURES TO IT INVOLVING VORT...AND A SECOND UPR WAVE WILL BE MOVG
IN OVERNIGHT FM CO. THIS SECOND WAVE WL CONT TO INTERACT WITH THE
SLOWLY SAGGING SOUTH BNDRY TO PRODUCE THAT HEAVY RAIN THREAT...MAINLY
FM I 90 SWD.

ON SUNDAY...SHRA AND A FEW TS ARE STILL A POSSIBILITY IN THE SOUTH.
ETA SHOWS THE CWA IN THE RIGHT REAR JET ENTRANCE RGN. BELIEVE THE
AVN IS SAGGING THE LOW LVL BNDRY TOO FAR TO THE SOUTH...AS AM NOT
SURE HOW IT CAN GO THAT FAR WITH THE UPPER RIDGE SO STRONG. SO AM
LEANING TOWARD THE ETA SOLN FOR LOW LVL FRONTAL PLACEMENT...ACTUALLY
ALL THE WAY INTO SUNDAY NIGHT AND MONDAY...WHEN IT LIFTS BACK TOWARD
THE CWA AS A WMFNT. PCPN CHCS WL CONT SUN NIGHT AND MON MORNING DUE
TO A LARGE AMOUNT OF MID LVL FRONTOGENESIS ALONG I 90...AND THE
STILL STRONG MID TO UPPER LEVEL PV/PV ADV REGIME IN THE AREA. THIS
DOES NOT CLEAR OUT OF HERE UNTIL LATE IN THE DAY ON MONDAY...ENDING
IN THE WEST OF COURSE FIRST.

LATER IN THE WEEK...MODELS STILL SHOW A KILLER RIDGE OVER THE MID
SECTION OF THE COUNTRY...WITH A GRTLKS HIGH PRES SYSTEM BACKING INTO
THE CWA ON TUE AND WED. MRF AND NEW 12Z AVN STILL SHOW A RIDGE RIDER
JUST TO THE WEST OF THE FSD CWA TUE NIGHT AND WED...AND LEFT OUT OF
ALL ZONES FOR NOW DUE TO LIKELY CAPPING. MRF/ECMWF THEN SHOW A
STRONGER WAVE MOVG THRU FRI NIGHT...SO THAT IS THE NEXT CHC FOR PCPN
AFTER MONDAY NIGHT.

.FSD...NONE

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.