Alert archive / Iowa / Tornado Warnings in 2005

Tornado Warning 25, NWS Sioux Falls, SD

November 12, 2005Clay County, Iowa

NWS Sioux Falls, SD issued this tornado warning at Nov 12, 2005, 4:55 PM CST for Clay County, Iowa. It was in force for 20 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, 4:55 PM CST (22:55 UTC)
Expired: Nov 12, 2005, 5:15 PM CST
In force: 20 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), 126 km from the middle of the area, began a volume at 22:58 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, 10.9 hours before the alert went out and 216 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 122255
TORFSD
IAC041-122330-
/O.NEW.KFSD.TO.W.0025.051112T2255Z-051112T2330Z/

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

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

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

* UNTIL 530 PM CST

* AT 455 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 5 MILES WEST OF
  ROYAL...OR ABOUT 13 MILES SOUTHWEST OF SPENCER...MOVING NORTHEAST
  AT 30 MPH.

* THE TORNADO WILL BE NEAR...
  EVERLY AROUND 510 PM CST

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

TAKE COVER NOW. THIS TORNADO IS WRAPPED IN RAIN. IF YOU WAIT TO SEE
OR HEAR IT COMING...IT MAY BE TOO LATE TO GET TO A SAFE PLACE.

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 4301 9540 4300 9533 4323 9510 4324 9536

$$

SCHUMACHER

1 follow-up statement

000 
WWUS53 KFSD 122315
SVSFSD

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

IAC041-122324-
/O.CAN.KFSD.TO.W.0025.000000T0000Z-051112T2330Z/
CLAY IA-
514 PM CST SAT NOV 12 2005

...THE TORNADO WARNING FOR WESTERN CLAY COUNTY IS CANCELLED...

THE STORM HAS WEAKENED AND IS NO LONGER SEVERE. 
HOWEVER...THUNDERSTORMS WILL CONTINUE TO MOVE ACROSS CLAY COUNTY AND 
WILL BE CAPABLE OF PRODUCING WIND GUSTS TO 40 MPH AND BRIEF HEAVY 
RAIN.

LAT...LON 4301 9540 4300 9533 4323 9510 4324 9536

$$

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, 4:33 PM CST	Tornado Warning	FSD	O'Brien, Sioux	27 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.