Alert archive / Iowa / Tornado Warnings in 2004

Tornado Warning 59, NWS Sioux Falls, SD

September 5, 2004Lyon County, Osceola County, Iowa; Nobles County, Minnesota

NWS Sioux Falls, SD issued this tornado warning at Sep 5, 2004, 3:30 PM CDT for Lyon County, Osceola County, Iowa; Nobles County, Minnesota. It was in force for 45 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: Sep 5, 2004, 3:30 PM CDT (20:30 UTC)
Expired: Sep 5, 2004, 4:15 PM CDT
In force: 45 min
Issued by: NWS Sioux Falls, SD
Area: Counties, with a storm outline in the text

Counties Lyon County, IA, Osceola County, IA, Nobles County, MN

The radar

The Sioux Falls radar (KFSD), 66 km from the middle of the area, began a volume at 20:33 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
Sep 5, 3:00 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 8.5 hours before the alert went out and 240 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: 246 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 698 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 282 m²/s²
0-3 km storm-relative helicity: 329 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

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

349 
WFUS53 KFSD 052030
TORFSD
IAC119-143-MNC105-052115-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
330 PM CDT SUN SEP 5 2004

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* TORNADO WARNING FOR...
  LYON COUNTY IN NORTHWEST IOWA
  WESTERN OSCEOLA COUNTY IN NORTHWEST IOWA
  NOBLES COUNTY IN SOUTHWEST MINNESOTA

* UNTIL 415 PM CDT

* AT 328 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR LITTLE
  ROCK...OR ABOUT 11 MILES EAST OF ROCK RAPIDS...MOVING NORTH AT 35
  MPH.

* THE TORNADO WILL BE NEAR...
  ELLSWORTH AROUND 335 PM CDT
  ADRIAN AROUND 350 PM CDT
  RUSHMORE AROUND 355 PM CDT
  WILMONT AROUND 410 PM CDT

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

A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM CDT SUNDAY EVENING FOR
NORTHWEST IOWA AND SOUTHWEST MINNESOTA.

LAT...LON 4328 9615 4327 9579 4379 9560 4378 9594

$$
RSR

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 5, 3:17 PM CDT	Tornado Warning	FSD	Cherokee, Ida, Plymouth, Woodbury	28 min
Sep 5, 3:44 PM CDT	Tornado Warning	FSD	Cherokee, O'Brien	46 min
Sep 5, 4:33 PM CDT	Tornado Warning	FSD	Clay, Dickinson, O'Brien, Osceola	27 min
Sep 5, 4:57 PM CDT	Tornado Warning	FSD	Dickinson	33 min
Sep 5, 5:33 PM CDT	Tornado Warning	FSD	Jackson	12 min

Nearby

Tornado Warnings in Iowa, 2004 Tornado Warnings in Minnesota, 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.