Alert archive / South Dakota / Tornado Warnings in 2000

Tornado Warning 20, NWS Sioux Falls, SD

July 11, 2000Minnehaha County, South Dakota

NWS Sioux Falls, SD issued this tornado warning at Jul 11, 2000, 6:56 PM CDT for Minnehaha County, South Dakota. It was in force for 34 min. 4 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jul 11, 2000, 6:56 PM CDT (23:56 UTC)
Expired: Jul 11, 2000, 7:30 PM CDT
In force: 34 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

County Minnehaha County, SD

The radar

The Sioux Falls radar (KFSD), 11 km from the middle of the area, began a volume at 23:56 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
Jul 11, 6:56 PM CDT	Tornado F0	Baltic, SD	A brief tornado caused no reported damage.
Jul 11, 7:00 PM CDT	Hail 1.75	Dell Rapids, SD
Jul 11, 7:15 PM CDT	Hail 1	Garretson, SD
Jul 11, 7:23 PM CDT	Thunderstorm Wind 52 E	Hartford, SD	Thunderstorm winds caused tree damage, including some trees blown down.

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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 11, 4:30 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 11.9 hours before the alert went out and 187 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: 683 J/kg
Mixed-layer CIN: -84 J/kg
Mixed-layer LCL: 957 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 105 m²/s²
0-3 km storm-relative helicity: 119 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KFSD 112357
TORFSD

SDC099-120030-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
656 PM CDT TUE JUL 11 2000

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN MINNEHAHA COUNTY IN SOUTHEAST SOUTH DAKOTA

* UNTIL 730 PM CDT

* AT 656 PM CDT...WEATHER SPOTTERS REPORTED A TORNADO 5 MILES NORTH
  OF BALTIC...OR ABOUT 19 MILES NORTH OF SIOUX FALLS...MOVING EAST AT 20
  MPH.

* THE TORNADO WILL BE NEAR...
  DELL RAPIDS AROUND 700 PM CDT

THIS WARNING REPLACES THE SEVERE THUNDERSTORM WARNING PREVIOUSLY
ISSUED FOR THE WARNED AREA.

THIS IS AN EXTREMELY DANGEROUS AND POTENTIALLY LIFE THREATENING
SITUATION. IF YOU ARE IN THE PATH OF THIS TORNADO...TAKE COVER
IMMEDIATELY. GO TO THE BASEMENT. IF A BASEMENT IS NOT AVAILABLE...GO
TO A SMALL INTERIOR ROOM ON THE LOWEST FLOOR.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 4:04 PM CDT	Severe Thunderstorm Warning	FSD	Beadle	41 min
Jul 11, 4:40 PM CDT	Severe Thunderstorm Warning	FSD	Kingsbury	35 min
Jul 11, 4:52 PM CDT	Tornado Warning	FSD	Kingsbury	23 min
Jul 11, 4:55 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Jerauld	35 min
Jul 11, 5:14 PM CDT	Severe Thunderstorm Warning	FSD	Kingsbury	31 min
Jul 11, 5:18 PM CDT	Tornado Warning	FSD	Kingsbury	27 min
Jul 11, 5:30 PM CDT	Severe Thunderstorm Warning	FSD	Jerauld, Sanborn	30 min
Jul 11, 5:34 PM CDT	Tornado Warning	FSD	Brookings	26 min
Jul 11, 5:36 PM CDT	Severe Thunderstorm Warning	FSD	Lake	24 min
Jul 11, 5:38 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Brule	37 min
Jul 11, 5:48 PM CDT	Tornado Warning	FSD	Lake	27 min
Jul 11, 5:59 PM CDT	Tornado Warning	FSD	Brookings, Moody	31 min
Jul 11, 6:05 PM CDT	Tornado Warning	FSD	Lake	25 min
Jul 11, 6:15 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Davison	30 min
Jul 11, 6:28 PM CDT	Tornado Warning	FSD	Lake, Moody	32 min
Jul 11, 6:40 PM CDT	Severe Thunderstorm Warning	FSD	McCook	35 min
Jul 11, 6:42 PM CDT	Severe Thunderstorm Warning	FSD	Davison	33 min
Jul 11, 6:48 PM CDT	Severe Thunderstorm Warning	FSD	Minnehaha	27 min
Jul 11, 6:59 PM CDT	Tornado Warning	FSD	McCook	21 min

Nearby

Tornado Warnings in South Dakota, 2000 Every tornado warning in 2000 Tornadoes 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.