Alert archive / Iowa / Tornado Warnings in 2013

Tornado Warning 14, NWS Sioux Falls, SD

October 4, 2013Woodbury County, Iowa

NWS Sioux Falls, SD issued this tornado warning at Oct 4, 2013, 6:07 PM CDT for Woodbury County, Iowa. It was in force for 38 min. 8 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, 6:07 PM CDT (23:07 UTC)
Expired: Oct 4, 2013, 6:45 PM CDT
In force: 38 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

County Woodbury County, IA

The radar

The Omaha radar (KOAX), 109 km from the middle of the area, began a volume at 23:09 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, 6:13 PM CDT	TORNADO	3 Wsw Sloan, IA	POWER POLES SNAPPED.
Oct 4, 6:16 PM CDT	TORNADO	2 Wsw Sloan, IA	SECOND BRIEF TORNADO TOUCHDOWN DESTROYED OUTBUILDING AND REMOVED LARGE TREE BRANCHES.
Oct 4, 6:20 PM CDT	TORNADO	2 Nw Sloan, IA	1 MILE WIDE TORNADO WITH DAMAGE AT 310TH STREET AND I-29
Oct 4, 6:26 PM CDT	TORNADO	3 Ese Salix, IA	TORNADO WITH STRUCTURE DAMAGE AT DALLAS AVENUE AND 290TH ST.
Oct 4, 6:29 PM CDT	TORNADO	4 E Salix, IA	THREE DAIRY OPEN AIR BUILDINGS HAD ALL WALLS FAIL.
Oct 4, 6:38 PM CDT	TORNADO	9 N Hornick, IA	LARGE TREE BRANCHES AND A FEW TREES DOWN.
Oct 4, 6:39 PM CDT	TORNADO	2 Sse Bronson, IA	LARGE TORNADO DAMAGED 3 HOMES AND A FARMSTEAD.
Oct 4, 6:40 PM CDT	TORNADO	8 S Moville, IA	GARAGE DESTROYED. ROOF DAMAGE AND WINDOWS BLOWN OUT OF HOUSE. SEVERAL OUTBUILDINGS DESTROYED.

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, 11.1 hours before the alert went out and 109 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.

005 
WFUS53 KFSD 042307
TORFSD
IAC193-042345-
/O.NEW.KFSD.TO.W.0014.131004T2307Z-131004T2345Z/

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

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* TORNADO WARNING FOR...
  WESTERN WOODBURY COUNTY IN WEST CENTRAL IOWA...

* UNTIL 645 PM CDT

* AT 602 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED 6 MILES EAST OF WALTHILL...AND MOVING NORTHEAST
  AT 40 MPH.

  HAZARD...TORNADO AND QUARTER SIZE HAIL.

  SOURCE...RADAR INDICATED ROTATION.

  IMPACT...MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE TO
           ROOFS...WINDOWS AND VEHICLES WILL OCCUR. FLYING DEBRIS
           WILL BE DEADLY TO PEOPLE AND ANIMALS. TREE DAMAGE IS
           LIKELY.

* THIS DANGEROUS STORM WILL BE NEAR...
  SLOAN AROUND 615 PM CDT.
  SALIX AROUND 620 PM CDT.
  LAWTON AROUND 640 PM CDT.

OTHER LOCATIONS IN THE WARNING INCLUDE BRONSON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS WARNING DOES NOT INCLUDE THE SIOUX CITY METRO AREA.

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

&&

LAT...LON 4222 9635 4224 9633 4230 9637 4233 9638
      4255 9623 4241 9595 4220 9615 4221 9635
TIME...MOT...LOC 2307Z 210DEG 33KT 4218 9635

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

CHAPMAN

4 follow-up statements

115 
WWUS53 KFSD 042320
SVSFSD

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

IAC193-042345-
/O.CON.KFSD.TO.W.0014.000000T0000Z-131004T2345Z/
WOODBURY IA-
620 PM CDT FRI OCT 4 2013

...A TORNADO WARNING REMAINS IN EFFECT FOR WESTERN WOODBURY COUNTY
UNTIL 645 PM CDT...

AT 615 PM CDT...A CONFIRMED TORNADO WAS LOCATED NEAR SLOAN...AND
MOVING NORTHEAST AT 30 MPH.

HAZARD...DAMAGING TORNADO AND QUARTER SIZE HAIL.

SOURCE...WEATHER SPOTTERS CONFIRMED TORNADO.

IMPACT...MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE TO
         ROOFS...WINDOWS AND VEHICLES WILL OCCUR. FLYING DEBRIS WILL
         BE DEADLY TO PEOPLE AND ANIMALS. TREE DAMAGE IS LIKELY.

THIS TORNADIC STORM WILL AFFECT MAINLY RURAL AREAS OF WESTERN
WOODBURY COUNTY.

EMERGENCY MANAGEMENT REPORTED A TORNADO JUST SOUTHWEST OF SLOAN AT 
615 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPEAT...A TORNADO IS ON THE GROUND. 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 4222 9635 4224 9633 4230 9637 4233 9638
      4255 9623 4241 9595 4220 9615 4221 9635
TIME...MOT...LOC 2320Z 226DEG 27KT 4225 9622

TORNADO...OBSERVED
HAIL...1.00IN

$$

CHAPMAN

467 
WWUS53 KFSD 042325
SVSFSD

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

IAC193-042345-
/O.CON.KFSD.TO.W.0014.000000T0000Z-131004T2345Z/
WOODBURY IA-
625 PM CDT FRI OCT 4 2013

...A TORNADO WARNING REMAINS IN EFFECT FOR WESTERN WOODBURY COUNTY
UNTIL 645 PM CDT...

AT 619 PM CDT...A CONFIRMED LARGE AND EXTREMELY DANGEROUS TORNADO WAS
LOCATED NEAR SLOAN...AND MOVING NORTHEAST AT 30 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.

LOCATIONS IMPACTED INCLUDE...
LAWTON AND BRONSON.

AT 620 PM...WOODBURY COUNTY EMERGENCY MANAGEMENT REPORTED A MILE 
WIDE TORNADO PRODUCING DAMAGE WAS REPORTED JUST NORTH OF SLOAN AT 
310TH ST AND INTERSTATE 29.

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 4222 9635 4224 9633 4230 9637 4233 9638
      4255 9623 4241 9595 4220 9615 4221 9635
TIME...MOT...LOC 2324Z 209DEG 25KT 4229 9624

TORNADO...OBSERVED
TORNADO DAMAGE THREAT...CONSIDERABLE
HAIL...1.00IN

$$

CHAPMAN

687 
WWUS53 KFSD 042329
SVSFSD

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

IAC193-042345-
/O.CON.KFSD.TO.W.0014.000000T0000Z-131004T2345Z/
WOODBURY IA-
629 PM CDT FRI OCT 4 2013

...A TORNADO WARNING REMAINS IN EFFECT FOR WESTERN WOODBURY COUNTY
UNTIL 645 PM CDT...

AT 624 PM CDT...A CONFIRMED LARGE AND EXTREMELY DANGEROUS TORNADO WAS
LOCATED NEAR SALIX...AND MOVING NORTHEAST AT 30 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.

LOCATIONS IMPACTED INCLUDE...
LAWTON AND BRONSON.

AT 626 PM CDT...WOODBURY COUNTY EMERGENCY MANAGEMENT REPORTED THE 
TORNADO CROSSING HIGHWAY 75 WITH DAMAGE NEAR DALLAS AVE.

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 4222 9635 4224 9633 4230 9637 4233 9638
      4255 9623 4241 9595 4220 9615 4221 9635
TIME...MOT...LOC 2329Z 209DEG 25KT 4232 9622

TORNADO...OBSERVED
TORNADO DAMAGE THREAT...CONSIDERABLE
HAIL...1.00IN

$$

CHAPMAN

498 
WWUS53 KFSD 042338
SVSFSD

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

IAC193-042345-
/O.CON.KFSD.TO.W.0014.000000T0000Z-131004T2345Z/
WOODBURY IA-
638 PM CDT FRI OCT 4 2013

...A TORNADO WARNING REMAINS IN EFFECT FOR WESTERN WOODBURY COUNTY
UNTIL 645 PM CDT...

AT 632 PM CDT...A CONFIRMED LARGE AND EXTREMELY DANGEROUS TORNADO WAS
LOCATED 6 MILES NORTHEAST OF SALIX...AND MOVING NORTHEAST AT 45 MPH.
A SECOND CIRCULATION WAS DEVELOPING 10 MILES SOUTH OF MOVILLE...AND
MAY PRODUCE A TORNADO AT ANY TIME.

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.

LOCATIONS IMPACTED INCLUDE...
LAWTON.

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 4224 9618 4227 9622 4231 9626 4234 9628
      4253 9619 4241 9595 4225 9611
TIME...MOT...LOC 2337Z 204DEG 39KT 4242 9616

TORNADO...OBSERVED
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, 6:11 PM CDT	Tornado Warning Tornado observed	FSD	Plymouth	49 min
Oct 4, 6:43 PM CDT	Tornado Warning	FSD	Cherokee, Ida, Plymouth, Woodbury	47 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.