Alert archive / Iowa / Tornado Warnings in 2004

Tornado Warning 39, NWS Sioux Falls, SD

June 11, 2004Clay County, Iowa

NWS Sioux Falls, SD issued this tornado warning at Jun 11, 2004, 3:30 PM CDT for Clay County, Iowa. It was in force for 30 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jun 11, 2004, 3:30 PM CDT (20:30 UTC)
Expired: Jun 11, 2004, 4:00 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), 140 km from the middle of the area, began a volume at 20:30 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
Jun 11, 3:35 PM CDT	TORNADO	2 S Fostoria, IA
Jun 11, 3:35 PM CDT	TORNADO	2 S Fostoria, IA
Jun 11, 3:35 PM CDT	TORNADO	2 S Fostoria, IA

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

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

Minneapolis, MN (KMPX), launched 12:00Z, 8.5 hours before the alert went out and 221 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 572 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: -29 m²/s²
0-3 km storm-relative helicity: 16 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

713 
WFUS53 KFSD 112030
TORFSD
IAC041-112100-

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

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

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

* UNTIL 400 PM CDT

* AT 330 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 7 MILES
  SOUTHEAST OF FOSTORIA...OR ABOUT 4 MILES EAST OF SPENCER...MOVING
  NORTHEAST AT 35 MPH.

* THE TORNADO WILL BE NEAR...
RURAL CLAY COUNTY THROUGH 340 PM CDT

THIS STORM HAS A HISTORY OF PRODUCING A TORNADO. 

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 4317 9521 4305 9493 4325 9492 4325 9516

$$

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, 2:45 PM CDT	Tornado Warning	FSD	Clay	30 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, 3:32 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.