Alert archive / Iowa / Tornado Warnings in 2001

Tornado Warning 39, NWS Sioux Falls, SD

June 12, 2001Dickinson County, Iowa

NWS Sioux Falls, SD issued this tornado warning at Jun 12, 2001, 9:01 PM CDT for Dickinson County, Iowa. It was in force for 29 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: Jun 12, 2001, 9:01 PM CDT (02:01 UTC)
Expired: Jun 12, 2001, 9:30 PM CDT
In force: 29 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Dickinson County, IA

What was reported inside it

Time	Report	Where	Remark
Jun 12, 9:21 PM CDT	Hail 1	Wahpeton, IA
Jun 12, 9:26 PM CDT	Tornado F0	Montgomery, IA	A brief tornado caused 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
Jun 12, 6:00 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 2.0 hours before the alert went out and 209 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: 1421 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 804 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 131 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 6.3

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KFSD 130202
TORFSD
IAC059-130230-

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

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* TORNADO WARNING FOR...
  DICKINSON COUNTY IN NORTHWEST IOWA

* UNTIL 930 PM CDT

* AT 901 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  TORNADO 5 MILES SOUTH OF LAKE PARK...OR 12 MILES WEST OF SPIRIT 
  LAKE...MOVING NORTHEAST AT 20 MPH.

* THE TORNADO WILL BE NEAR...
  SPIRIT LAKE AROUND 925 PM CDT

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

THIS IS AN EXTREMELY DANGEROUS AND LIFE THREATENING SITUAT)ION. TAKE
COVER NOW.

LAT...LON 4342 9540 4329 9538 4342 9510 4351 9513

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, 8:30 PM CDT	Tornado Warning	FSD	Osceola	30 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, 9:11 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.