Alert archive / Iowa / Tornado Warnings in 2013

Tornado Warning 17, NWS Sioux Falls, SD

October 4, 20134 counties in Iowa

NWS Sioux Falls, SD issued this tornado warning at Oct 4, 2013, 6:43 PM CDT for 4 counties in Iowa. It was in force for 47 min. 6 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: Oct 4, 2013, 6:43 PM CDT (23:43 UTC)
Expired: Oct 4, 2013, 7:30 PM CDT
In force: 47 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Cherokee County, IA, Ida County, IA, Plymouth County, IA, Woodbury County, IA

The radar

The Sioux Falls radar (KFSD), 131 km from the middle of the area, began a volume at 23:45 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
Oct 4, 6:44 PM CDT	HAIL 1.75	2 W Moville, IA
Oct 4, 6:47 PM CDT	FUNNEL CLOUD	8 Wsw Anthon, IA
Oct 4, 6:57 PM CDT	TORNADO	5 E Moville, IA	MILE WIDE TORNADO PRODUCING MAJOR DAMAGE
Oct 4, 7:04 PM CDT	TORNADO	2 S Pierson, IA	INTERIOR WALLS OF HOME REMOVED...AS WELL AS MOST OF SOUTH...WEST AND NORTH EXTERIOR WALLS. SHED DESTROYED. MAJOR LARGE TREE DAMAGE.
Oct 4, 7:09 PM CDT	HAIL 1	7 W Washta, IA
Oct 4, 7:28 PM CDT	TSTM WND GST 70	Quimby, IA	LARGE BRANCHES DOWN.

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
Oct 4, 2:38 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 11.7 hours before the alert went out and 146 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: 97 J/kg
Mixed-layer CIN: -211 J/kg
Mixed-layer LCL: 898 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 128 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.9

Open this sounding in Storm Lab

The text

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

944 
WFUS53 KFSD 042343
TORFSD
IAC035-093-149-193-050030-
/O.NEW.KFSD.TO.W.0017.131004T2343Z-131005T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
643 PM CDT FRI OCT 4 2013

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN CHEROKEE COUNTY IN NORTHWEST IOWA...
  NORTHWESTERN IDA COUNTY IN WEST CENTRAL IOWA...
  SOUTHEASTERN PLYMOUTH COUNTY IN NORTHWEST IOWA...
  CENTRAL WOODBURY COUNTY IN WEST CENTRAL IOWA...

* UNTIL 730 PM CDT

* AT 641 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A LARGE
  AND EXTREMELY DANGEROUS TORNADO WAS LOCATED 8 MILES SOUTH OF
  MOVILLE...AND MOVING NORTHEAST AT 40 MPH.

  THIS IS A PARTICULARLY DANGEROUS SITUATION.

  HAZARD...DAMAGING TORNADO.

  SOURCE...RADAR INDICATED ROTATION.

  IMPACT...YOU ARE IN A LIFE THREATENING SITUATION. MOBILE HOMES WILL
           BE DESTROYED. CONSIDERABLE DAMAGE TO HOMES...BUSINESSES
           AND VEHICLES IS LIKELY AND COMPLETE DESTRUCTION POSSIBLE.
           FLYING DEBRIS WILL BE DEADLY TO PEOPLE AND ANIMALS. EXPECT
           TREES TO BE UPROOTED OR SNAPPED.

* THE TORNADO WILL BE NEAR...
  BETWEEN ANTHON AND MOVILLE AROUND 650 PM CDT.
  PIERSON AND CORRECTIONVILLE AROUND 700 PM CDT.
  WASHTA AROUND 715 PM CDT.
  QUIMBY AROUND 720 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING TORNADOES. TAKE COVER IN A
BASEMENT OR STORM SHELTER NOW!

&&

LAT...LON 4281 9587 4265 9549 4227 9599 4238 9624
TIME...MOT...LOC 2343Z 221DEG 34KT 4239 9601

TORNADO...RADAR INDICATED
TORNADO DAMAGE THREAT...CONSIDERABLE
HAIL...<.75IN

$$

CHAPMAN

3 follow-up statements

257 
WWUS53 KFSD 042350
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
650 PM CDT FRI OCT 4 2013

IAC035-093-149-193-050030-
/O.CON.KFSD.TO.W.0017.000000T0000Z-131005T0030Z/
PLYMOUTH IA-IDA IA-CHEROKEE IA-WOODBURY IA-
650 PM CDT FRI OCT 4 2013

...A TORNADO WARNING REMAINS IN EFFECT FOR CENTRAL WOODBURY...
SOUTHERN CHEROKEE...NORTHWESTERN IDA AND SOUTHEASTERN PLYMOUTH
COUNTIES UNTIL 730 PM CDT...

AT 640 PM CDT...A CONFIRMED LARGE AND EXTREMELY DANGEROUS TORNADO WAS
LOCATED 8 MILES EAST OF BRONSON...AND MOVING NORTHEAST AT 40 
MPH.

THIS IS A PARTICULARLY DANGEROUS SITUATION.

HAZARD...DAMAGING TORNADO.

SOURCE...WEATHER SPOTTERS CONFIRMED TORNADO.

IMPACT...YOU ARE IN A LIFE THREATENING SITUATION. MOBILE HOMES WILL
         BE DESTROYED. CONSIDERABLE DAMAGE TO HOMES...BUSINESSES AND
         VEHICLES IS LIKELY AND COMPLETE DESTRUCTION POSSIBLE. FLYING
         DEBRIS WILL BE DEADLY TO PEOPLE AND ANIMALS. EXPECT TREES TO
         BE UPROOTED OR SNAPPED.

THE TORNADO WILL BE NEAR...
  BEWTEEN PIERSON AND CORRECTIONVILLE AROUND 700 PM CDT.
  WASHTA AROUND 715 PM CDT.
  QUIMBY AROUND 720 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING TORNADOES. TAKE COVER IN A
BASEMENT OR STORM SHELTER NOW!

&&

LAT...LON 4281 9587 4265 9549 4227 9599 4238 9624
TIME...MOT...LOC 2349Z 221DEG 34KT 4243 9596

TORNADO...OBSERVED
TORNADO DAMAGE THREAT...CONSIDERABLE
HAIL...1.75IN

$$

CHAPMAN

159 
WWUS53 KFSD 050001
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
701 PM CDT FRI OCT 4 2013

IAC035-093-149-193-050030-
/O.CON.KFSD.TO.W.0017.000000T0000Z-131005T0030Z/
PLYMOUTH IA-IDA IA-CHEROKEE IA-WOODBURY IA-
701 PM CDT FRI OCT 4 2013

...A TORNADO WARNING REMAINS IN EFFECT FOR CENTRAL WOODBURY...
SOUTHERN CHEROKEE...NORTHWESTERN IDA AND SOUTHEASTERN PLYMOUTH
COUNTIES UNTIL 730 PM CDT...

AT 658 PM CDT...A CONFIRMED LARGE AND EXTREMELY DANGEROUS TORNADO WAS
LOCATED NEAR PIERSON...AND MOVING NORTHEAST AT 40 MPH.

THIS IS A PARTICULARLY DANGEROUS SITUATION.

HAZARD...DAMAGING TORNADO.

SOURCE...WEATHER SPOTTERS CONFIRMED TORNADO.

IMPACT...YOU ARE IN A LIFE THREATENING SITUATION. MOBILE HOMES WILL
         BE DESTROYED. CONSIDERABLE DAMAGE TO HOMES...BUSINESSES AND
         VEHICLES IS LIKELY AND COMPLETE DESTRUCTION POSSIBLE. FLYING
         DEBRIS WILL BE DEADLY TO PEOPLE AND ANIMALS. EXPECT TREES TO
         BE UPROOTED OR SNAPPED.

THE TORNADO WILL BE NEAR...
  WASHTA AROUND 715 PM CDT.
  QUIMBY AROUND 725 PM CDT.

AT 657 PM CDT...A MILE WIDE TORNADO WAS REPORTED NEAR MOVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPEAT...A LARGE...EXTREMELY DANGEROUS AND POTENTIALLY DEADLY
TORNADO IS ON THE GROUND. TO PROTECT YOUR LIFE...TAKE COVER NOW. MOVE
TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID
WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR OUTDOORS...MOVE TO THE
CLOSEST SUBSTANTIAL SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4281 9587 4265 9549 4227 9599 4238 9624
TIME...MOT...LOC 0001Z 221DEG 34KT 4250 9587

TORNADO...OBSERVED
TORNADO DAMAGE THREAT...CONSIDERABLE
HAIL...1.75IN

$$

CHAPMAN

586 
WWUS53 KFSD 050009
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
709 PM CDT FRI OCT 4 2013

IAC035-093-149-193-050030-
/O.CON.KFSD.TO.W.0017.000000T0000Z-131005T0030Z/
PLYMOUTH IA-IDA IA-CHEROKEE IA-WOODBURY IA-
709 PM CDT FRI OCT 4 2013

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTH CENTRAL WOODBURY...
SOUTHERN CHEROKEE...NORTHWESTERN IDA AND SOUTHEASTERN PLYMOUTH
COUNTIES UNTIL 730 PM CDT...

AT 707 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A LARGE
AND EXTREMELY DANGEROUS TORNADO WAS LOCATED NEAR PIERSON...AND MOVING
NORTHEAST AT 30 MPH.

THIS IS A PARTICULARLY DANGEROUS SITUATION.

HAZARD...DAMAGING TORNADO.

SOURCE...RADAR INDICATED ROTATION.

IMPACT...YOU ARE IN A LIFE THREATENING SITUATION. MOBILE HOMES WILL
         BE DESTROYED. CONSIDERABLE DAMAGE TO HOMES...BUSINESSES AND
         VEHICLES IS LIKELY AND COMPLETE DESTRUCTION POSSIBLE. FLYING
         DEBRIS WILL BE DEADLY TO PEOPLE AND ANIMALS. EXPECT TREES TO
         BE UPROOTED OR SNAPPED.

THE TORNADO WILL BE NEAR...
  WASHTA AROUND 720 PM CDT.
  QUIMBY AROUND 730 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING TORNADOES. TAKE COVER IN A
BASEMENT OR STORM SHELTER NOW!

&&

LAT...LON 4252 9607 4281 9587 4265 9549 4238 9584
TIME...MOT...LOC 0009Z 227DEG 28KT 4252 9582

TORNADO...RADAR INDICATED
TORNADO DAMAGE THREAT...CONSIDERABLE
HAIL...1.75IN

$$

CHAPMAN

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 4, 6:07 PM CDT	Tornado Warning	FSD	Woodbury	38 min
Oct 4, 6:11 PM CDT	Tornado Warning Tornado observed	FSD	Plymouth	49 min
Oct 4, 6:55 PM CDT	Tornado Warning Tornado observed	FSD	Plymouth, Sioux	50 min
Oct 4, 6:57 PM CDT	Tornado Warning	FSD	Plymouth	18 min

Nearby

Tornado Warnings in Iowa, 2013 Every tornado warning in 2013 Tornadoes in 2013

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.