Alert archive / Iowa / Tornado Warnings in 2013

Tornado Warning 23, NWS Sioux Falls, SD

October 4, 2013Buena Vista County, Clay County, Iowa

NWS Sioux Falls, SD issued this tornado warning at Oct 4, 2013, 8:27 PM CDT for Buena Vista County, Clay County, Iowa. It was in force for 33 min. 1 report 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, 8:27 PM CDT (01:27 UTC)
Expired: Oct 4, 2013, 9:00 PM CDT
In force: 33 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Buena Vista County, IA, Clay County, IA

The radar

The Sioux Falls radar (KFSD), 140 km from the middle of the area, began a volume at 01:29 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, 8:46 PM CDT	TORNADO	3 Nw Webb, IA	TREE AND BUILDING DAMAGE TO FARMSTEAD.

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 00:00Z, 1.5 hours before the alert went out and 200 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: 1572 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 1464 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: 224 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 5.7

Open this sounding in Storm Lab

The text

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

824 
WFUS53 KFSD 050127
TORFSD
IAC021-041-050200-
/O.NEW.KFSD.TO.W.0023.131005T0127Z-131005T0200Z/

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

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN BUENA VISTA COUNTY IN NORTHWEST IOWA...
  SOUTHERN CLAY COUNTY IN NORTHWEST IOWA...

* UNTIL 900 PM CDT

* AT 825 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR PETERSON...AND MOVING NORTHEAST AT 35 MPH.

  HAZARD...TORNADO.

  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...
  GREENVILLE AROUND 845 PM CDT.

OTHER LOCATIONS IN THE WARNING INCLUDE ROSSIE AND GILLETT GROVE.

STRONG DAMAGING WINDS TO AROUND 60 MPH WILL BE POSSIBLE FOR AREAS 
NEAR LINN GROVE...SIOUX RAPIDS...AND WEBB.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4279 9538 4291 9539 4310 9525 4300 9490
TIME...MOT...LOC 0126Z 230DEG 29KT 4290 9531

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

CHAPMAN

2 follow-up statements

143 
WWUS53 KFSD 050141
SVSFSD

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

IAC021-041-050200-
/O.CON.KFSD.TO.W.0023.000000T0000Z-131005T0200Z/
BUENA VISTA IA-CLAY IA-
841 PM CDT FRI OCT 4 2013

...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHERN CLAY AND NORTH
CENTRAL BUENA VISTA COUNTIES UNTIL 900 PM CDT...

AT 837 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A BRIEF
SPINUP TORNADO WAS LOCATED NEAR LINN GROVE...AND MOVING NORTHEAST AT 
25 MPH. 

HAZARD...TORNADO.

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...
  GREENVILLE AROUND 855 PM CDT.

OTHER LOCATIONS IN THE WARNING INCLUDE ROSSIE. STRONG DAMAGING WINDS 
OF AROUND 60 MPH ARE POSSIBLE IN AREAS BETWEEN SIOUX RAPIDS...WEBB...
AND GREENVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4282 9532 4293 9538 4310 9525 4300 9490
TIME...MOT...LOC 0140Z 214DEG 22KT 4296 9525

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

CHAPMAN

281 
WWUS53 KFSD 050149
SVSFSD

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

IAC021-041-050200-
/O.CON.KFSD.TO.W.0023.000000T0000Z-131005T0200Z/
BUENA VISTA IA-CLAY IA-
849 PM CDT FRI OCT 4 2013

...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHERN CLAY AND NORTH
CENTRAL BUENA VISTA COUNTIES UNTIL 900 PM CDT...

AT 844 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A BRIEF 
SPINUP TORNADO WAS LOCATED 5 MILES WEST OF WEBB...AND MOVING 
NORTHEAST AT 45 MPH.

HAZARD...TORNADO.

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 AFFECT MAINLY RURAL AREAS OF NORTH CENTRAL 
BUENA VISTA AND SOUTHERN CLAY COUNTIES. IN ADDITION TO THE TORNADO 
THREAT...DAMAGING WINDS OF AROUND 60 MPH ARE LIKELY BETWEEN 
GREENVILLE...GILLETT GROVE...AND WEBB.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAINFALL MAY HIDE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR THE
TORNADO. TAKE COVER NOW.

&&

LAT...LON 4282 9532 4293 9538 4310 9525 4300 9490
TIME...MOT...LOC 0147Z 238DEG 38KT 4296 9507

TORNADO...RADAR INDICATED
HAIL...<.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, 7:22 PM CDT	Tornado Warning Emergency	FSD	Cherokee	38 min
Oct 4, 7:25 PM CDT	Tornado Warning Tornado observed	FSD	Plymouth	35 min
Oct 4, 7:54 PM CDT	Tornado Warning	FSD	Buena Vista, Cherokee	36 min
Oct 4, 8:33 PM CDT	Severe Thunderstorm Warning	FSD	Buena Vista	42 min
Oct 4, 8:55 PM CDT	Tornado Warning	FSD	Clay	20 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.