Alert archive / Iowa / Tornado Warnings in 2001

Tornado Warning 34, NWS Sioux Falls, SD

June 12, 2001Osceola County, Iowa

NWS Sioux Falls, SD issued this tornado warning at Jun 12, 2001, 8:30 PM CDT for Osceola County, Iowa. It was in force for 30 min. No storm report in the archive falls 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.

The facts

Issued: Jun 12, 2001, 8:30 PM CDT (01:30 UTC)
Expired: Jun 12, 2001, 9:00 PM CDT
In force: 30 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Osceola County, IA

The watch it was issued in

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

Issued	Product	Office	Lasted
Jun 12, 6:00 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 1.5 hours before the alert went out and 230 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: 3450 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 1438 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 98 m²/s²
0-3 km storm-relative helicity: 254 m²/s²
Significant tornado parameter: 2.8
Supercell composite: 20.6

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KFSD 130131
TORFSD

IAC143-130200-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
830 PM CDT TUE JUN 12 2001

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEAST OSCEOLA COUNTY IN NORTHWEST IOWA

* UNTIL 900 PM CDT

* AT 830 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  A TORNADO 3 MILES NORTHEAST OF MELVIN...OR ABOUT 23 MILES SOUTH 
  OF WORTHINGTON...MOVING NORTHEAST AT 10 MPH.

* THE TORNADO WILL BE NEAR...
RURAL OSCEOLA COUNTY NORTHEAST OF MELVIN THROUGH 900 PM CDT.

THIS EXTENDS A PORTION OF THE PREVIOUS TORNADO WARNING.

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

LAT...LON 4331 9562 4326 9557 4332 9540 4339 9542

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 12, 7:19 PM CDT	Severe Thunderstorm Warning	FSD	Lyon	41 min
Jun 12, 7:34 PM CDT	Severe Thunderstorm Warning	FSD	Sioux	11 min
Jun 12, 7:47 PM CDT	Severe Thunderstorm Warning	FSD	O'Brien, Osceola	43 min
Jun 12, 7:58 PM CDT	Tornado Warning	FSD	Lyon	32 min
Jun 12, 8:08 PM CDT	Tornado Warning	FSD	O'Brien, Osceola	37 min
Jun 12, 8:22 PM CDT	Severe Thunderstorm Warning	FSD	Dickinson	23 min
Jun 12, 8:27 PM CDT	Tornado Warning	FSD	Lyon	48 min
Jun 12, 8:34 PM CDT	Severe Thunderstorm Warning	FSD	Osceola	41 min
Jun 12, 8:39 PM CDT	Severe Thunderstorm Warning	FSD	Dickinson	51 min
Jun 12, 9:01 PM CDT	Tornado Warning	FSD	Dickinson	29 min
Jun 12, 9:11 PM CDT	Tornado Warning	FSD	Lyon, Osceola	34 min
Jun 12, 9:25 PM CDT	Flash Flood Warning	FSD	Osceola	95 min
Jun 12, 9:30 PM CDT	Tornado Warning	FSD	Dickinson	30 min
Jun 12, 9:43 PM CDT	Tornado Warning	FSD	Osceola	47 min
Jun 12, 9:52 PM CDT	Severe Thunderstorm Warning	FSD	Lyon	23 min
Jun 12, 9:55 PM CDT	Flash Flood Warning	FSD	Lyon	3 hr
Jun 12, 10:29 PM CDT	Tornado Warning	FSD	Osceola	31 min
Jun 12, 10:40 PM CDT	Severe Thunderstorm Warning	FSD	Lyon	50 min
Jun 12, 10:44 PM CDT	Tornado Warning	FSD	Dickinson	31 min
Jun 12, 11:15 PM CDT	Severe Thunderstorm Warning	FSD	Dickinson	30 min
Jun 12, 11:30 PM CDT	Severe Thunderstorm Warning	FSD	Lyon	45 min
Jun 13, 6:17 PM CDT	Severe Thunderstorm Warning	FSD	Woodbury	28 min
Jun 13, 6:36 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth	24 min
Jun 13, 6:45 PM CDT	Severe Thunderstorm Warning	FSD	Woodbury	30 min
Jun 13, 6:59 PM CDT	Severe Thunderstorm Warning	FSD	Lyon, Sioux	31 min

Nearby

Tornado Warnings in Iowa, 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; the sounding from the Mesonet's radiosonde archive.