Alert archive / South Dakota / Tornado Warnings in 2001

Tornado Warning 74, NWS Sioux Falls, SD

August 29, 2001Brookings County, South Dakota

NWS Sioux Falls, SD issued this tornado warning at Aug 29, 2001, 6:32 PM CDT for Brookings County, South Dakota. It was in force for 28 min. 2 reports came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: Aug 29, 2001, 6:32 PM CDT (23:32 UTC)
Expired: Aug 29, 2001, 7:00 PM CDT
In force: 28 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Brookings County, SD

The radar

The Sioux Falls radar (KFSD), 88 km from the middle of the area, began a volume at 23:34 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.

What was reported inside it

Time	Report	Where	Remark
Aug 29, 6:52 PM CDT	Hail 2.75	Bushnell, SD	Large hail damaged crops, especially soybeans. Damage to buildings and vehicles was also reported, but the amount of damage was not known.
Aug 29, 6:53 PM CDT	Hail 1	Brookings, SD

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.

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 11.5 hours before the alert went out and 147 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: 559 J/kg
Mixed-layer CIN: -400 J/kg
Mixed-layer LCL: 2208 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 149 m²/s²
0-3 km storm-relative helicity: 248 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

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

386 
WFUS53 KFSD 292333
TORFSD
SDC011-300000-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
632 PM CDT WED AUG 29 2001

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* TORNADO WARNING FOR...
  EASTERN BROOKINGS COUNTY IN EAST CENTRAL SOUTH DAKOTA

* UNTIL 700 PM CDT

* AT 632 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A TORNADO 4 MILES NORTH OF BROOKINGS NEAR INTERSTATE 29...MOVING 
  EAST AT 20 MPH.

* THE TORNADO WILL BE NEAR...
  AURORA...WHITE AROUND 640 PM CDT
  ELKTON AROUND 700 PM CDT

A STORM SPOTTER HAS REPORTED ROTATION WITH THIS STORM.

THIS IS AN EXTREMELY DANGEROUS AND LIFE THREATENING SITUATION. TAKE
COVER NOW.

LAT...LON 4448 9682 4431 9690 4419 9647 4444 9646

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 29, 5:28 PM CDT	Severe Thunderstorm Warning	FSD	Brookings	32 min
Aug 29, 5:58 PM CDT	Severe Thunderstorm Warning	FSD	Hutchinson	32 min
Aug 29, 5:59 PM CDT	Severe Thunderstorm Warning	FSD	Brookings	31 min
Aug 29, 6:05 PM CDT	Severe Thunderstorm Warning	FSD	Lake, Moody	40 min
Aug 29, 6:17 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix	43 min
Aug 29, 6:28 PM CDT	Severe Thunderstorm Warning	FSD	Hutchinson	32 min
Aug 29, 6:40 PM CDT	Severe Thunderstorm Warning	FSD	McCook	35 min
Aug 29, 6:46 PM CDT	Severe Thunderstorm Warning	FSD	Lake, Moody	44 min
Aug 29, 6:58 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix	32 min
Aug 29, 6:59 PM CDT	Severe Thunderstorm Warning	FSD	Brookings	46 min

Nearby

Tornado Warnings in South Dakota, 2001 Every tornado warning in 2001 Tornadoes in 2001

Sources

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.