Alert archive / Iowa / Tornado Warnings in 2005

Tornado Warning 24, NWS Sioux Falls, SD

November 12, 2005O'Brien County, Sioux County, Iowa

NWS Sioux Falls, SD issued this tornado warning at Nov 12, 2005, 4:33 PM CST for O'Brien County, Sioux County, Iowa. It was in force for 27 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: Nov 12, 2005, 4:33 PM CST (22:33 UTC)
Expired: Nov 12, 2005, 5:00 PM CST
In force: 27 min
Issued by: NWS Sioux Falls, SD
Area: Counties, with a storm outline in the text

Counties O'Brien County, IA, Sioux County, IA

The radar

The Sioux Falls radar (KFSD), 86 km from the middle of the area, began a volume at 22:36 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
Nov 12, 1:44 PM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 10.6 hours before the alert went out and 206 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: 1049 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 155 m²/s²
0-3 km storm-relative helicity: 136 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KFSD 122233
TORFSD
IAC141-167-122300-
/O.NEW.KFSD.TO.W.0024.051112T2233Z-051112T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
433 PM CST SAT NOV 12 2005

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

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

* UNTIL 500 PM CST

* AT 433 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 4 MILES SOUTH OF
  SHELDON...OR ABOUT 13 MILES NORTHEAST OF ORANGE CITY...MOVING
  NORTHEAST AT 35 MPH.

AT 427 PM CST...WEATHER SPOTTERS REPORTED A TORNADO NEAR HOSPERS.

* THE TORNADO WILL BE NEAR...
  SHELDON AROUND 450 PM CST

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

A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM CST SATURDAY EVENING
FOR NORTHWEST IOWA AND SOUTHWEST MINNESOTA AND NORTHEAST NEBRASKA AND
SOUTHEASTERN SOUTH DAKOTA.

LAT...LON 4305 9600 4306 9579 4325 9567 4325 9590

$$

SCHUMACHER

2 follow-up statements

000 
WWUS53 KFSD 122240
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
440 PM CST SAT NOV 12 2005

IAC141-167-122300-
/O.CON.KFSD.TO.W.0024.000000T0000Z-051112T2300Z/
SIOUX IA-OBRIEN IA-
440 PM CST SAT NOV 12 2005

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 500 PM CST FOR OBRIEN 
AND EASTERN SIOUX COUNTIES...

AT 440 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A TORNADO.  THIS TORNADO WAS LOCATED 3 MILES SOUTH OF
SHELDON...OR ABOUT 14 MILES NORTHEAST OF ORANGE CITY...MOVING
NORTHEAST AT 30 MPH.

* THE TORNADO WILL BE NEAR...
  2 MILES EAST OF SHELDON AROUND 445 PM CST

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

A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM CST SATURDAY EVENING
FOR NORTHWEST IOWA AND SOUTHWEST MINNESOTA AND NORTHEAST NEBRASKA AND
SOUTHEASTERN SOUTH DAKOTA.

LAT...LON 4309 9592 4310 9577 4325 9567 4326 9587

$$

SCHUMACHER

000 
WWUS53 KFSD 122259
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
459 PM CST SAT NOV 12 2005

IAC141-167-122309-
/O.EXP.KFSD.TO.W.0024.000000T0000Z-051112T2300Z/
SIOUX IA-OBRIEN IA-
459 PM CST SAT NOV 12 2005

...THE TORNADO WARNING FOR OBRIEN AND SIOUX COUNTIES EXPIRES AT 500
PM CST...

THE STORM HAS WEAKENED AND EXITED THE COUNTY.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM CST SATURDAY EVENING
FOR NORTHWEST IOWA AND SOUTHWEST MINNESOTA AND NORTHEAST NEBRASKA AND
SOUTHEASTERN SOUTH DAKOTA.

LAT...LON 4309 9592 4310 9577 4325 9567 4326 9587

$$

SCHUMACHER

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 12, 4:14 AM CST	Wind Advisory	FSD	Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more	31 hr
Nov 12, 3:23 PM CST	Severe Thunderstorm Warning	FSD	Plymouth	29 min
Nov 12, 4:01 PM CST	Severe Thunderstorm Warning	FSD	Lyon, Sioux	29 min
Nov 12, 4:55 PM CST	Tornado Warning	FSD	Clay	20 min

Nearby

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