Alert archive / Iowa / Tornado Warnings in 2004

Tornado Warning 37, NWS Sioux Falls, SD

June 11, 2004Clay County, Iowa

NWS Sioux Falls, SD issued this tornado warning at Jun 11, 2004, 2:45 PM CDT for Clay 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 as issued.

The facts

Issued: Jun 11, 2004, 2:45 PM CDT (19:45 UTC)
Expired: Jun 11, 2004, 3:15 PM CDT
In force: 30 min
Issued by: NWS Sioux Falls, SD
Area: Counties, with a storm outline in the text

County Clay County, IA

The radar

The Sioux Falls radar (KFSD), 158 km from the middle of the area, began a volume at 19:45 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.

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 11, 1:45 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 7.8 hours before the alert went out and 219 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: 1910 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 636 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 136 m²/s²
0-3 km storm-relative helicity: 161 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 6.5

Open this sounding in Storm Lab

The text

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

181 
WFUS53 KFSD 111945
TORFSD
IAC041-112015-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
245 PM CDT FRI JUN 11 2004

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* TORNADO WARNING FOR...
  EXTREME SOUTHEAST CLAY COUNTY IN NORTHWEST IOWA

* UNTIL 315 PM CDT

* AT 245 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
  A TORNADO OVER CLAY COUNTY...OR ABOUT 14 MILES SOUTHEAST OF
  SPENCER...MOVING NORTHEAST AT 15 MPH.

* THE TORNADO WILL REMAIN IN...
RURAL CLAY COUNTY THROUGH 300 PM CDT

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

A TORNADO WATCH REMAINS IN EFFECT UNTIL 700 PM CDT FRIDAY EVENING FOR
NORTHWEST IOWA AND SOUTHWEST MINNESOTA.

LAT...LON 4292 9501 4291 9492 4303 9492 4314 9493

$$

BOUSTEAD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 11, 2:53 AM CDT	Severe Thunderstorm Warning	FSD	Woodbury	37 min
Jun 11, 3:21 AM CDT	Severe Thunderstorm Warning	FSD	Ida	24 min
Jun 11, 3:45 AM CDT	Severe Thunderstorm Warning	FSD	Ida	30 min
Jun 11, 1:00 PM CDT	Severe Thunderstorm Warning	FSD	Cherokee	30 min
Jun 11, 1:30 PM CDT	Severe Thunderstorm Warning	FSD	Buena Vista	30 min
Jun 11, 1:50 PM CDT	Severe Thunderstorm Warning	FSD	Clay	40 min
Jun 11, 2:15 PM CDT	Tornado Warning	FSD	Buena Vista, Clay	30 min
Jun 11, 2:34 PM CDT	Severe Thunderstorm Warning	FSD	Clay, O'Brien	26 min
Jun 11, 2:48 PM CDT	Severe Thunderstorm Warning	FSD	Dickinson, Osceola	42 min
Jun 11, 2:59 PM CDT	Tornado Warning	FSD	Clay	31 min
Jun 11, 3:30 PM CDT	Tornado Warning	FSD	Clay	30 min
Jun 11, 3:32 PM CDT	Severe Thunderstorm Warning	FSD	Dickinson	28 min
Jun 11, 3:37 PM CDT	Tornado Warning	FSD	Dickinson	23 min

Nearby

Tornado Warnings in Iowa, 2004 Every tornado warning in 2004 Tornadoes in 2004

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; radar from the NEXRAD Level II archive.