Alert archive / Iowa / Tornado Warnings in 2004

Tornado Warning 26, NWS Sioux Falls, SD

May 28, 2004Sioux County, Iowa

NWS Sioux Falls, SD issued this tornado warning at May 28, 2004, 8:44 PM CDT for Sioux County, Iowa. It was in force for 46 min. 2 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: May 28, 2004, 8:44 PM CDT (01:44 UTC)
Expired: May 28, 2004, 9:30 PM CDT
In force: 46 min
Issued by: NWS Sioux Falls, SD
Area: Counties, with a storm outline in the text

County Sioux County, IA

The radar

The Sioux Falls radar (KFSD), 72 km from the middle of the area, began a volume at 01:44 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
May 28, 9:05 PM CDT	HAIL 1	3 Nne Sioux Center, IA	ONLY A FEW STONES
May 28, 9:05 PM CDT	HAIL 1	3 Nne Sioux Center, IA	ONLY A FEW STONES

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
May 28, 3:45 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 1.7 hours before the alert went out and 195 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: 821 J/kg
Mixed-layer CIN: -143 J/kg
Mixed-layer LCL: 1968 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 152 m²/s²
0-3 km storm-relative helicity: 379 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.5

Open this sounding in Storm Lab

The text

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

410 
WFUS53 KFSD 290144
TORFSD
IAC167-290230-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
844 PM CDT FRI MAY 28 2004

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

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

* UNTIL 930 PM CDT

* AT 844 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 8 MILES NORTH OF
  IRETON...OR ABOUT 9 MILES NORTHEAST OF HAWARDEN...MOVING EAST AT 25
  MPH.

* THE TORNADO WILL BE NEAR...
  SIOUX CENTER AROUND 855 PM CDT
  ORANGE CITY AROUND 915 PM CDT
  GRANVILLE AROUND 930 PM CDT

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

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT
FRIDAY EVENING FOR NORTHWEST IOWA AND SOUTHWEST MINNESOTA AND
NORTHEAST NEBRASKA AND SOUTHEASTERN SOUTH DAKOTA.

LAT...LON 4319 9638 4296 9639 4292 9588 4310 9588

$$

PS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 28, 7:47 PM CDT	Severe Thunderstorm Warning	FSD	Lyon	43 min
May 28, 8:04 PM CDT	Tornado Warning	FSD	Sioux	41 min
May 28, 8:26 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth, Woodbury	49 min
May 28, 8:37 PM CDT	Tornado Warning	FSD	Woodbury	23 min
May 28, 8:59 PM CDT	Tornado Warning	FSD	Woodbury	31 min
May 28, 9:27 PM CDT	Tornado Warning	FSD	Sioux	33 min
May 28, 9:31 PM CDT	Tornado Warning	FSD	Woodbury	29 min
May 28, 9:35 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth	25 min
May 28, 9:48 PM CDT	Severe Thunderstorm Warning	FSD	Ida	27 min
May 28, 9:57 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth, Sioux	33 min
May 28, 9:57 PM CDT	Tornado Warning	FSD	Woodbury	18 min
May 28, 10:15 PM CDT	Severe Thunderstorm Warning	FSD	Ida	15 min
May 28, 10:17 PM CDT	Severe Thunderstorm Warning	FSD	Ida	13 min
May 28, 10:30 PM CDT	Severe Thunderstorm Warning	FSD	Cherokee	45 min
May 28, 10:32 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth	28 min
May 28, 10:58 PM CDT	Severe Thunderstorm Warning	FSD	Ida	62 min
May 28, 11:13 PM CDT	Severe Thunderstorm Warning	FSD	Cherokee	32 min
May 28, 11:45 PM CDT	Severe Thunderstorm Warning	FSD	Dickinson	30 min
May 29, 12:02 AM CDT	Severe Thunderstorm Warning	FSD	Buena Vista	28 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.