Alert archive / Iowa / Tornado Warnings in 2005

Tornado Warning 6, NWS Sioux Falls, SD

June 4, 2005Sioux County, Iowa

NWS Sioux Falls, SD issued this tornado warning at Jun 4, 2005, 10:24 PM CDT for Sioux County, Iowa. It was in force for 51 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 4, 2005, 10:24 PM CDT (03:24 UTC)
Expired
Jun 4, 2005, 11:15 PM CDT
In force
51 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), 69 km from the middle of the area, began a volume at 03:28 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 nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 3.4 hours before the alert went out and 193 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-pSkew-T log-p diagram, Omaha, NE at 00:00Z on 2005-06-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1467 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 00:00Z on 2005-06-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 21 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
1467 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
1297 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
21 m²/s²
0-3 km storm-relative helicity
156 m²/s²
Significant tornado parameter
0.6
Supercell composite
6.1

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KFSD 050324
TORFSD
IAC167-050415-
/O.NEW.KFSD.TO.W.0006.050605T0324Z-050605T0415Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1024 PM CDT SAT JUN 4 2005

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

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

* UNTIL 1115 PM CDT

* AT 1024 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 4 MILES WEST OF
  IRETON...OR ABOUT NEAR HAWARDEN...MOVING NORTHEAST AT 25 MPH.

* THE TORNADO WILL BE NEAR...
  IRETON AROUND 1030 PM CDT
  SIOUX CENTER AROUND 1055 PM CDT
  HULL AROUND 1110 PM CDT

THIS WARNING REPLACES THE SEVERE THUNDERSTORM WARNING PREVIOUSLY
ISSUED FOR THE WARNED AREA.

TAKE COVER NOW. TORNADOES AT NIGHT ARE EXTREMELY DANGEROUS. DO NOT
WAIT UNTIL YOU SEE OR HEAR THE TORNADO. IT MAY BE TOO LATE.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 200 AM CDT SUNDAY MORNING FOR
NORTHWEST IOWA AND NORTHEAST NEBRASKA AND SOUTHEAST SOUTH DAKOTA.

LAT...LON 4303 9650 4293 9643 4304 9596 4323 9613

$$

MJF
2 follow-up statements
000 
WWUS53 KFSD 050354
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1053 PM CDT SAT JUN 4 2005

IAC167-050415-
/O.CON.KFSD.TO.W.0006.000000T0000Z-050605T0415Z/
SIOUX IA-
1053 PM CDT SAT JUN 4 2005

...A TORNADO WARNING CONTINUES UNTIL 1115 PM CDT FOR SIOUX COUNTY...

AT 1053 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A STRONG ROTATION INDICATING A DEVELOPING TORNADO.  THIS 
TORNADO WAS LOCATED 7 MILES SOUTHEAST OF ROCK VALLEY...MOVING 
NORTHEAST AT 25 MPH.

THIS CELL HAS PRODUCED SEVERAL BRIEF TORNADO TOUCHDOWNS IN ITS 
HISTORY.

TAKE COVER NOW. TORNADOES AT NIGHT ARE EXTREMELY DANGEROUS. DO NOT
WAIT UNTIL YOU SEE OR HEAR THE TORNADO. IT MAY BE TOO LATE.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 200 AM CDT SUNDAY MORNING FOR
NORTHWEST IOWA AND NORTHEAST NEBRASKA AND SOUTHEAST SOUTH DAKOTA.

LAT...LON 4317 9641 4311 9631 4317 9604 4325 9616

$$

MJF
000 
WWUS53 KFSD 050412
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1112 PM CDT SAT JUN 4 2005

IAC167-050422-
/O.EXP.KFSD.TO.W.0006.000000T0000Z-050605T0415Z/
SIOUX IA-
1112 PM CDT SAT JUN 4 2005

...THE TORNADO WARNING FOR SIOUX COUNTY EXPIRES AT 1115 PM CDT...

THE WARNING HAS EXPIRED. THE STORM IS NO LONGER SEVERE.

HOWEVER A NEW CELL HAS DEVELOPED IN NORTHWEST SIOUX COUNTY AND WILL 
BE MONITORED CLOSELY FOR SEVERE DEVELOPMENT.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 200 AM CDT SUNDAY MORNING FOR
NORTHWEST IOWA AND NORTHEAST NEBRASKA AND SOUTHEAST SOUTH DAKOTA.

LAT...LON 4317 9641 4311 9631 4317 9604 4325 9616

$$

MJF

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 4, 9:49 PM CDTTornado WarningFSDPlymouth, Sioux29 min
Jun 4, 10:14 PM CDTSevere Thunderstorm WarningFSDSioux46 min
Jun 4, 11:05 PM CDTSevere Thunderstorm WarningFSDLyon20 min
Jun 4, 11:55 PM CDTFlash Flood WarningFSDLyon, Sioux3 hr
Jun 5, 12:02 AM CDTSevere Thunderstorm WarningFSDSioux29 min
Jun 5, 5:15 PM CDTSevere Thunderstorm WarningFSDLyon, Sioux39 min

Nearby

Tornado Warnings in Iowa, 2005Every tornado warning in 2005Tornadoes in 2005

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.