Alert archive / South Dakota / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 173, NWS Sioux Falls, SD

August 4, 2000Brule County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 4, 2000, 11:29 PM CDT for Brule County, South Dakota. It was in force for 31 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 4, 2000, 11:29 PM CDT (04:29 UTC)
Expired: Aug 5, 2000, 12:00 AM CDT
In force: 31 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

County Brule County, SD

The radar

The Sioux Falls radar (KFSD), 190 km from the middle of the area, began a volume at 04:39 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 4, 10:00 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 4.5 hours before the alert went out and 142 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: 2354 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 1004 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 98 m²/s²
0-3 km storm-relative helicity: 105 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 6.9

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS53 KFSD 050429
SVRFSD
SDC015-050500-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1129 PM CDT FRI AUG 4 2000

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN BRULE COUNTY IN SOUTH CENTRAL SOUTH DAKOTA

* UNTIL MIDNIGHT CDT

* AT 1129 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 10 MILES WEST OF CHAMBERLAIN...MOVING EAST AT
  35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  CHAMBERLAIN AROUND 1140 PM CDT

THIS STORM WILL PRODUCE LARGE HAIL. GO INSIDE A STURDY BUILDING AND
STAY AWAY FROM WINDOWS.

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 Sioux Falls, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 4, 8:50 PM CDT, 2 hours 39 minutes earlier.

Area forecast discussion, Aug 4, 8:50 PM CDT, 2 hours 39 minutes before

AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA
NATIONAL WEATHER SERVICE SIOUX FALLS SD
850 PM CDT FRI AUG 4 2000

SCT TRW CONT TO FIRE UP ALONG AND N OF BNDRY FM WRN SD INTO SW MN.
WUD EXPECT ACTIVITY TO CONT DURG THE NIGHT AS LLJ INCREASES WITH
TIME. BEST ACTIVITY SHUD BE ACRS NRN CWA NR THIS BNDRY. HWVR...WITH
NO CAP IN PLACE OVR CWA...AND WITH S/W MOVG ACRS THE DAKOTAS...WUD
EXPECT SOME ACTIVITY TO ALSO SPRD INTO THE S. NEXT PBLM IS IF MAIN
THREAT WL BE HVY RAIN OR SVR. FEEL MAIN THREAT FOR SVR WL BE ACRS
NRN CWA WHERE H7 TEMPS ARE COOLER AND THREAT OF HAIL WUD BE GREATER.
BEST ACTVY OVR NCNTRL SD SHUD SLIDE SE ACRS SFC BNDRY DURG THE NITE
AND M>AY TURN INTO AN MCS WITH INCREASING LLJ. SO ALL IN
ALL...CURRENT FCST NOT THAT BAD.

.FSD...NONE.

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 4, 11:52 PM CDT	Severe Thunderstorm Warning	FSD	Beadle	53 min
Aug 5, 12:42 AM CDT	Tornado Warning	FSD	Jerauld	33 min
Aug 5, 12:46 AM CDT	Severe Thunderstorm Warning	FSD	Beadle	29 min
Aug 5, 1:07 AM CDT	Severe Thunderstorm Warning	FSD	Jerauld, Sanborn	38 min
Aug 5, 1:45 AM CDT	Severe Thunderstorm Warning	FSD	Davison, Sanborn	30 min
Aug 5, 2:03 AM CDT	Severe Thunderstorm Warning	FSD	Hanson	27 min
Aug 5, 2:16 AM CDT	Severe Thunderstorm Warning	FSD	Davison	14 min
Aug 5, 2:30 AM CDT	Severe Thunderstorm Warning	FSD	Davison, Hanson	30 min
Aug 5, 4:41 AM CDT	Severe Thunderstorm Warning	FSD	Beadle	34 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2000 Every severe thunderstorm warning in 2000

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.