Alert archive / Iowa / Tornado Warnings in 2013

Tornado Warning 22, NWS Sioux Falls, SD

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

NWS Sioux Falls, SD issued this tornado warning at Oct 4, 2013, 7:54 PM CDT for Buena Vista County, Cherokee County, Iowa. It was in force for 36 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, 7:54 PM CDT (00:54 UTC)
Expired
Oct 4, 2013, 8:30 PM CDT
In force
36 min
Issued by
NWS Sioux Falls, SD
Area
Storm-based polygon
Tornado
Radar indicated
Hail
1.0 in

Counties Buena Vista County, IA, Cherokee County, IA

The radar

The Sioux Falls radar (KFSD), 135 km from the middle of the area, began a volume at 00:54 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

TimeReportWhereRemark
Oct 4, 8:18 PM CDTTORNADO6 Ssw Peterson, IACROPS FLATTENED AND TRACK IN FIELDS.

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.

IssuedProductOfficeLasted
Oct 4, 2:38 PM CDTTornado WatchSPC7 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 0.9 hours before the alert went out and 179 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-pSkew-T log-p diagram, Omaha, NE at 00:00Z on 2013-10-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1572 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 00:00Z on 2013-10-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -5 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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.

948 
WFUS53 KFSD 050054
TORFSD
IAC021-035-050130-
/O.NEW.KFSD.TO.W.0022.131005T0054Z-131005T0130Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
754 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...
  NORTHEASTERN CHEROKEE COUNTY IN NORTHWEST IOWA...

* UNTIL 830 PM CDT

* AT 750 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A LARGE
  AND EXTREMELY DANGEROUS TORNADO WAS LOCATED NEAR CHEROKEE...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...
  LINN GROVE AROUND 825 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4267 9554 4277 9567 4291 9550 4290 9512
TIME...MOT...LOC 0054Z 222DEG 25KT 4276 9548

TORNADO...RADAR INDICATED
TORNADO DAMAGE THREAT...CONSIDERABLE
HAIL...1.00IN

$$

CHAPMAN
2 follow-up statements
711 
WWUS53 KFSD 050101
SVSFSD

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

IAC021-035-050130-
/O.CON.KFSD.TO.W.0022.000000T0000Z-131005T0130Z/
BUENA VISTA IA-CHEROKEE IA-
801 PM CDT FRI OCT 4 2013

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHEASTERN CHEROKEE AND
NORTHWESTERN BUENA VISTA COUNTIES UNTIL 830 PM CDT...

AT 759 PM CDT...A CONFIRMED LARGE AND EXTREMELY DANGEROUS TORNADO WAS
LOCATED NEAR CHEROKEE...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.

THE TORNADO WILL BE NEAR...
  LINN GROVE AROUND 825 PM CDT.
  SIOUX RAPIDS AROUND 830 PM CDT.

AT 746 PM CDT...A TORNADO WAS REPORTED BY CHEROKEE COUNTY LAW 
ENFORCEMENT 1 MILE SOUTH OF CHEROKEE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4267 9554 4277 9567 4291 9550 4290 9512
TIME...MOT...LOC 0101Z 229DEG 24KT 4279 9545

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

$$

CHAPMAN
640 
WWUS53 KFSD 050112
SVSFSD

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

IAC021-035-050130-
/O.CON.KFSD.TO.W.0022.000000T0000Z-131005T0130Z/
BUENA VISTA IA-CHEROKEE IA-
812 PM CDT FRI OCT 4 2013

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHEASTERN CHEROKEE AND
NORTHWESTERN BUENA VISTA COUNTIES UNTIL 830 PM CDT...

AT 809 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A LARGE
AND EXTREMELY DANGEROUS TORNADO WAS LOCATED 7 MILES SOUTHWEST OF
PETERSON...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...
  LINN GROVE AROUND 825 PM CDT.
  SIOUX RAPIDS AROUND 830 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORNADOES ARE DIFFICULT TO SEE AND CONFIRM AT NIGHT. TAKE COVER NOW.

&&

LAT...LON 4267 9554 4277 9567 4291 9550 4290 9512
TIME...MOT...LOC 0112Z 229DEG 24KT 4284 9537

TORNADO...RADAR INDICATED
TORNADO DAMAGE THREAT...CONSIDERABLE
HAIL...1.00IN

$$

CHAPMAN

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 4, 7:22 PM CDTTornado Warning EmergencyFSDCherokee38 min
Oct 4, 7:25 PM CDTTornado Warning Tornado observedFSDPlymouth35 min
Oct 4, 8:27 PM CDTTornado WarningFSDBuena Vista, Clay33 min
Oct 4, 8:33 PM CDTSevere Thunderstorm WarningFSDBuena Vista42 min
Oct 4, 8:55 PM CDTTornado WarningFSDClay20 min

Nearby

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