Alert archive / Iowa / Tornado Warnings in 2004

Tornado Warning 38, NWS Sioux Falls, SD

June 11, 2004Clay County, Iowa

NWS Sioux Falls, SD issued this tornado warning at Jun 11, 2004, 2:59 PM CDT for Clay County, Iowa. It was in force for 31 min. 19 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, 2:59 PM CDT (19:59 UTC)
Expired: Jun 11, 2004, 3:30 PM CDT
In force: 31 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), 130 km from the middle of the area, began a volume at 20:00 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
Jun 11, 3:08 PM CDT	TORNADO	1 Nw Everly, IA	308 PM TO 315 PM...3 CONFIRMED TORNAOES IN EVERLY AREA. 4 OUTBUILDINGS ON FARM 1 MILE NORTH AND A 1/4 MILE WEST OF EVERLY DESTORYED.
Jun 11, 3:08 PM CDT	TORNADO	2 W Everly, IA
Jun 11, 3:08 PM CDT	TORNADO	2 W Everly, IA
Jun 11, 3:08 PM CDT	TORNADO	2 W Everly, IA
Jun 11, 3:10 PM CDT	TORNADO	Everly, IA
Jun 11, 3:10 PM CDT	TORNADO	Everly, IA
Jun 11, 3:10 PM CDT	TORNADO	Everly, IA
Jun 11, 3:13 PM CDT	TORNADO	N Everly, IA	TORNADO ON HIGHWAY 18 JUST NORTH OF EVERLY
Jun 11, 3:13 PM CDT	TORNADO	N Everly, IA	TORNADO ON HIGHWAY 18 JUST NORTH OF EVERLY
Jun 11, 3:13 PM CDT	TORNADO	N Everly, IA	TORNADO ON HIGHWAY 18 JUST NORTH OF EVERLY
Jun 11, 3:13 PM CDT	TORNADO	S Everly, IA	TORNADO 1/2 MILE SOUTH OF HIGHWAY 18
Jun 11, 3:13 PM CDT	TORNADO	S Everly, IA	TORNADO 1/2 MILE SOUTH OF HIGHWAY 18
Jun 11, 3:13 PM CDT	TORNADO	S Everly, IA	TORNADO 1/2 MILE SOUTH OF HIGHWAY 18
Jun 11, 3:20 PM CDT	HAIL 0.88	Spencer, IA
Jun 11, 3:20 PM CDT	HAIL 0.88	Spencer, IA
Jun 11, 3:20 PM CDT	HAIL 0.88	Spencer, IA
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

Omaha, NE (KOAX), launched 12:00Z, 8.0 hours before the alert went out and 226 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.

897 
WFUS53 KFSD 111959
TORFSD
IAC041-112030-

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

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

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

* UNTIL 330 PM CDT

* AT 259 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO OVER EVERLY...OR
  ABOUT 10 MILES WEST OF SPENCER...MOVING NORTHEAST AT 20 MPH.

* THE TORNADO WILL BE NEAR...
  SPENCER AROUND 315 PM CDT
  FOSTORIA AROUND 325 PM CDT

A TORNADO HAS BEEN CONFIRMED. TAKE COVER IN A STURDY BUILDING NOW.
MOBILE HOMES AND VEHICLES ARE NOT SAFE.

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 4310 9537 4315 9499 4325 9499 4325 9539

$$

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, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.