Alert archive / Wisconsin / Tornado Warnings in 2015

Tornado Warning 5, NWS La Crosse, WI

July 18, 2015Grant County, Wisconsin; Clayton County, Iowa

NWS La Crosse, WI issued this tornado warning at Jul 18, 2015, 12:03 PM CDT for Grant County, Wisconsin; Clayton County, Iowa. It was in force for 27 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 18, 2015, 12:03 PM CDT (17:03 UTC)
Expired: Jul 18, 2015, 12:30 PM CDT
In force: 27 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Clayton County, IA, Grant County, WI

The radar

The La Crosse radar (KARX), 125 km from the middle of the area, began a volume at 17:03 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.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 5.1 hours before the alert went out and 127 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: 2984 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 858 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: -27 m²/s²
0-3 km storm-relative helicity: 23 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

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

664 
WFUS53 KARX 181703
TORARX
IAC043-WIC043-181730-
/O.NEW.KARX.TO.W.0005.150718T1703Z-150718T1730Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
1203 PM CDT SAT JUL 18 2015

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN CLAYTON COUNTY IN NORTHEASTERN IOWA...
  CENTRAL GRANT COUNTY IN SOUTHWESTERN WISCONSIN...

* UNTIL 1230 PM CDT
    
* AT 1202 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED OVER CASSVILLE...OR 8 MILES SOUTHEAST OF
  GUTTENBERG...MOVING NORTHEAST AT 40 MPH.

  HAZARD...TORNADO. 

  SOURCE...RADAR INDICATED ROTATION. 

  IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT 
           SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. 
           DAMAGE TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR.  TREE 
           DAMAGE IS LIKELY. 

* THIS DANGEROUS STORM WILL BE NEAR...
  LANCASTER AROUND 1225 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE
BEETOWN...POTOSI...TENNYSON...NORTH BUENA VISTA AND MILLVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST
FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF YOU ARE OUTDOORS...IN A
MOBILE HOME...OR IN A VEHICLE...MOVE TO THE CLOSEST SUBSTANTIAL
SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4276 9110 4295 9064 4270 9063 4266 9085
      4268 9090 4266 9090 4265 9097 4265 9107
TIME...MOT...LOC 1702Z 250DEG 38KT 4270 9100 

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

$$

ECKBERG

1 follow-up statement

801 
WWUS53 KARX 181716
SVSARX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
1216 PM CDT SAT JUL 18 2015

IAC043-WIC043-181730-
/O.CON.KARX.TO.W.0005.000000T0000Z-150718T1730Z/
CLAYTON IA-GRANT WI-
1216 PM CDT SAT JUL 18 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1230 PM CDT FOR
SOUTHEASTERN CLAYTON AND SOUTHWESTERN GRANT COUNTIES...
    
AT 1216 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED OVER CASSVILLE...OR 9 MILES SOUTHEAST OF GUTTENBERG...
MOVING EAST AT 40 MPH.

HAZARD...TORNADO. 

SOURCE...RADAR INDICATED ROTATION. 

IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT 
         SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE 
         TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR.  TREE DAMAGE IS 
         LIKELY. 

THIS DANGEROUS STORM WILL BE NEAR...
  LANCASTER AROUND 1230 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE
BEETOWN...POTOSI...TENNYSON...NORTH BUENA VISTA AND NELSON DEWEY
STATE PARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST
FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF YOU ARE OUTDOORS...IN A
MOBILE HOME...OR IN A VEHICLE...MOVE TO THE CLOSEST SUBSTANTIAL
SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4274 9103 4291 9064 4270 9063 4266 9085
      4268 9090 4268 9093 4267 9101
TIME...MOT...LOC 1716Z 260DEG 30KT 4270 9096 

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

$$

ECKBERG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 1:23 AM CDT	Severe Thunderstorm Warning	ARX	Buffalo	67 min
Jul 18, 1:36 AM CDT	Special Weather Statement	ARX	Trempealeau	84 min
Jul 18, 2:06 AM CDT	Severe Thunderstorm Warning	ARX	Buffalo, Trempealeau	54 min
Jul 18, 2:24 AM CDT	Special Weather Statement	ARX	Clark, Jackson, La Crosse, Monroe, Taylor	66 min
Jul 18, 2:32 AM CDT	Severe Thunderstorm Warning	ARX	Clark, Taylor	73 min
Jul 18, 2:43 AM CDT	Severe Thunderstorm Warning	ARX	Jackson, La Crosse, Monroe, Trempealeau	77 min
Jul 18, 3:09 AM CDT	Special Weather Statement	ARX	Vernon	66 min
Jul 18, 3:21 AM CDT	Special Weather Statement	ARX	Adams, Juneau	114 min
Jul 18, 3:36 AM CDT	Areal Flood Advisory	ARX	La Crosse	114 min
Jul 18, 3:37 AM CDT	Severe Thunderstorm Warning	ARX	Adams, Juneau	68 min
Jul 18, 4:02 AM CDT	Special Weather Statement	ARX	Crawford, Grant, Richland	73 min
Jul 18, 10:38 AM CDT	Special Weather Statement	ARX	Grant	37 min
Jul 18, 11:26 AM CDT	Special Weather Statement	ARX	Grant	49 min
Jul 18, 12:31 PM CDT	Tornado Warning	ARX	Grant	44 min
Jul 18, 1:14 PM CDT	Tornado Warning	ARX	Grant	16 min
Jul 18, 2:14 AM CDT	Special Weather Statement	ARX	Mitchell	61 min
Jul 18, 2:57 AM CDT	Severe Thunderstorm Warning	ARX	Howard, Mitchell	27 min

Nearby

Tornado Warnings in Wisconsin, 2015 Tornado Warnings in Iowa, 2015 Every tornado warning in 2015 Tornadoes in 2015

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.