Alert archive / Iowa / Tornado Warnings in 2013

Tornado Warning 21, NWS La Crosse, WI

June 12, 2013Clayton County, Iowa; Grant County, Wisconsin

NWS La Crosse, WI issued this tornado warning at Jun 12, 2013, 4:05 PM CDT for Clayton County, Iowa; Grant County, Wisconsin. It was in force for 25 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
Jun 12, 2013, 4:05 PM CDT (21:05 UTC)
Expired
Jun 12, 2013, 4:30 PM CDT
In force
25 min
Issued by
NWS La Crosse, WI
Area
Storm-based polygon
Tornado
Radar indicated
Hail
1.0 in

Counties Clayton County, IA, Grant County, WI

The radar

The La Crosse radar (KARX), 114 km from the middle of the area, began a volume at 21:07 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
Jun 12, 4:15 PM CDTFUNNEL CLOUDGuttenberg, IA

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
Jun 12, 1:49 PM CDTTornado Watch PDSSPC9 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 9.1 hours before the alert went out and 139 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, Davenport, at 12:00Z on 2013-06-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1812 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 12:00Z on 2013-06-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 square meters per square second.19395878Sfc1 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
1812 J/kg
Mixed-layer CIN
-167 J/kg
Mixed-layer LCL
1138 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
185 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0

Open this sounding in Storm Lab

The text

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

909 
WFUS53 KARX 122105
TORARX
IAC043-WIC043-122130-
/O.NEW.KARX.TO.W.0021.130612T2105Z-130612T2130Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
405 PM CDT WED JUN 12 2013

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* TORNADO WARNING FOR...
  EAST CENTRAL CLAYTON COUNTY IN NORTHEAST IOWA...
  WEST CENTRAL GRANT COUNTY IN SOUTHWEST WISCONSIN...

* UNTIL 430 PM CDT

* AT 403 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR GARNAVILLO...AND MOVING SOUTHEAST AT 25
  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...
  GUTTENBERG AROUND 420 PM CDT.

OTHER LOCATIONS IN THE WARNING INCLUDE OSTERDOCK...GLEN HAVEN...LOCK 
AND DAM 10...MILLVILLE...NELSON DEWEY STATE PARK...TURKEY RIVER AND 
NORTH ANDOVER.

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 4283 9092 4267 9104 4279 9128 4288 9121
TIME...MOT...LOC 2105Z 295DEG 22KT 4282 9120

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

$$

AJ
1 follow-up statement
636 
WWUS53 KARX 122117
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
417 PM CDT WED JUN 12 2013

IAC043-WIC043-122130-
/O.CON.KARX.TO.W.0021.000000T0000Z-130612T2130Z/
CLAYTON IA-GRANT WI-
417 PM CDT WED JUN 12 2013

...A TORNADO WARNING REMAINS IN EFFECT FOR WEST CENTRAL GRANT AND
EAST CENTRAL CLAYTON COUNTIES UNTIL 430 PM CDT...

AT 412 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED NEAR GUTTENBERG...AND MOVING SOUTHEAST AT 25 MPH.

HAZARD...TORNADO AND QUARTER SIZE HAIL.

SOURCE...WEATHER SPOTTERS REPORTED MULTIPLE FUNNEL CLOUDS NEAR       
         GUTTENBERG.

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 THE FOLLOWING  LOCATIONS... 
GUTTENBERG...MILLVILLE...NELSON DEWEY STATE PARK AND TURKEY RIVER.

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 4278 9121 4285 9116 4283 9092 4267 9104
TIME...MOT...LOC 2117Z 297DEG 21KT 4279 9112

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

$$

AJ

The office that day

Everything else NWS La Crosse, WI issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 12, 3:55 PM CDTSevere Thunderstorm WarningARXClayton65 min
Jun 12, 4:29 PM CDTTornado WarningARXClayton46 min
Jun 12, 5:54 PM CDTSevere Thunderstorm WarningARXHoward, Mitchell66 min
Jun 12, 4:35 PM CDTSevere Thunderstorm WarningARXGrant, Richland55 min
Jun 12, 4:38 PM CDTTornado WarningARXGrant37 min
Jun 12, 5:48 PM CDTAreal Flood AdvisoryARXAdams, Juneau3 hr

Nearby

Tornado Warnings in Iowa, 2013Tornado Warnings in Wisconsin, 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.