Alert archive / South Dakota / Tornado Warnings in 2001

Tornado Warning 62, NWS Sioux Falls, SD

July 27, 2001Minnehaha County, South Dakota

NWS Sioux Falls, SD issued this tornado warning at Jul 27, 2001, 7:43 PM CDT for Minnehaha County, South Dakota. It was in force for 32 min. 1 report 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: Jul 27, 2001, 7:43 PM CDT (00:43 UTC)
Expired: Jul 27, 2001, 8:15 PM CDT
In force: 32 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Minnehaha County, SD

The radar

The Sioux Falls radar (KFSD), 9 km from the middle of the area, began a volume at 00:44 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 27, 7:45 PM CDT	Tornado F0	(Fsd)Joe Foss Fld Si, SD	A tornado crossing into the county from Lincoln County caused no reported damage in Minnehaha County before dissipating.

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 00:00Z, 0.7 hours before the alert went out and 200 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: 731 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 1167 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: -18 m²/s²
0-3 km storm-relative helicity: -54 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.6

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KFSD 280044
TORFSD

SDC099-280115-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
743 PM CDT FRI JUL 27 2001

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* TORNADO WARNING FOR...
  EXTREME SOUTHERN MINNEHAHA COUNTY IN SOUTHEAST SOUTH DAKOTA

* UNTIL 815 PM CDT

* AT 743 PM CDT...WEATHER SPOTTERS REPORTED A TORNADO 7 MILES
  SOUTHWEST OF SIOUX FALLS...MOVING EAST AT 20 MPH.

* THE TORNADO WILL MOVE EAST NEAR AND SOUTH OF THE MINNEHAHA
  LINCOLN COUNTY LINE THROUGH 815 PM CDT.


IF YOU ARE IN THE PATH OF THIS TORNADO...TAKE COVER IMMEDIATELY.

LAT...LON 4354 9690 4350 9692 4350 9647 4352 9646

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 27, 7:27 PM CDT	Tornado Warning	FSD	Lincoln	33 min
Jul 27, 7:56 PM CDT	Tornado Warning	FSD	Lincoln	34 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.