Alert archive / South Dakota / Tornado Warnings in 1997

Tornado Warning 12, NWS Sioux Falls, SD

July 24, 1997Kingsbury County, South Dakota

NWS Sioux Falls, SD issued this tornado warning at Jul 24, 1997, 11:05 PM CDT for Kingsbury County, South Dakota. It was in force for 35 min. 2 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 24, 1997, 11:05 PM CDT (04:05 UTC)
Expired: Jul 24, 1997, 11:40 PM CDT
In force: 35 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

County Kingsbury County, SD

The radar

The Sioux Falls radar (KFSD), 106 km from the middle of the area, began a volume at 04:04 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 24, 11:30 PM CDT	Tornado F0	Lake Preston, SD	A brief tornado caused minor damage to a home.
Jul 24, 11:45 PM CDT	Tornado F0	Lake Preston, SD	A tornado in an open area resulted in no reported damage.

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 24, 10:00 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 4.1 hours before the alert went out and 93 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: 2516 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 877 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 50 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.6

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFSD 250406 RRA
TORFSD
SDC077-250440-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1105 PM CDT THU JUL 24 1997

* TORNADO WARNING FOR
  EASTERN KINGSBURY COUNTY IN EASTCENTRAL SOUTH DAKOTA

* UNTIL 1140 PM CDT
 
* SOME AREAS AFFECTED
  ERWIN                    AROUND 1120 PM CDT

* AT 1103 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A DEVELOPING TORNADO 30 MILES WEST OF BROOKINGS NEAR LAKE PRESTON
 MOVING NORTHEAST AT 20 MPH.
 
IF YOU ARE IN THE PATH OF A TORNADO...THE SAFEST PLACE IN A HOME OR
BUSINESS IS AN INTERIOR ROOM ON THE LOWEST FLOOR POSSIBLE.  AVOID
WINDOWS.

UMLAND

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 24, 7:15 PM CDT	Severe Thunderstorm Warning	FSD	Beadle	35 min
Jul 24, 7:51 PM CDT	Severe Thunderstorm Warning	FSD	Beadle	24 min
Jul 24, 8:12 PM CDT	Tornado Warning	FSD	Moody	33 min
Jul 24, 8:18 PM CDT	Severe Thunderstorm Warning	FSD	Beadle	32 min
Jul 24, 9:08 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Kingsbury	47 min
Jul 24, 9:36 PM CDT	Severe Thunderstorm Warning	FSD	Hanson	34 min
Jul 24, 9:49 PM CDT	Tornado Warning	FSD	Kingsbury	31 min
Jul 24, 10:33 PM CDT	Tornado Warning	FSD	Kingsbury	32 min
Jul 24, 11:41 PM CDT	Severe Thunderstorm Warning	FSD	Brookings	49 min
Jul 25, 12:02 AM CDT	Tornado Warning	FSD	Kingsbury	33 min

Nearby

Tornado Warnings in South Dakota, 1997 Every tornado warning in 1997 Tornadoes in 1997

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.