Alert archive / Wisconsin / Tornado Warnings in 2015

Tornado Warning 7, NWS La Crosse, WI

July 18, 2015Grant County, Wisconsin

NWS La Crosse, WI issued this tornado warning at Jul 18, 2015, 1:14 PM CDT for Grant County, Wisconsin. It was in force for 16 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, 1:14 PM CDT (18:14 UTC)
Expired: Jul 18, 2015, 1:30 PM CDT
In force: 16 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Grant County, WI

The radar

The Quad Cities radar (KDVN), 126 km from the middle of the area, began a volume at 18:17 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, 6.2 hours before the alert went out and 125 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.

687 
WFUS53 KARX 181814
TORARX
WIC043-181830-
/O.NEW.KARX.TO.W.0007.150718T1814Z-150718T1830Z/

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

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* TORNADO WARNING FOR...
  EAST CENTRAL GRANT COUNTY IN SOUTHWESTERN WISCONSIN...

* UNTIL 130 PM CDT
    
* AT 112 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A 
  TORNADO WAS LOCATED NEAR PLATTEVEILLE...MOVING EAST AT 40 MPH. AT 
  110 PM...WINDS GUSTED TO 56 MPH AT UW PLATTEVILLE.

  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 TORNADIC THUNDERSTORM WILL REMAIN OVER MAINLY RURAL AREAS OF
  EAST CENTRAL GRANT COUNTY...INCLUDING THE FOLLOWING LOCATIONS...
  PLATTEVILLE AIRPORT.

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 4275 9051 4283 9043 4269 9043 4269 9052
TIME...MOT...LOC 1812Z 248DEG 35KT 4280 9029 

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

$$

DAS

1 follow-up statement

341 
WWUS53 KARX 181825
SVSARX

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

WIC043-181835-
/O.EXP.KARX.TO.W.0007.000000T0000Z-150718T1830Z/
GRANT WI-
125 PM CDT SAT JUL 18 2015

...THE TORNADO WARNING FOR EAST CENTRAL GRANT COUNTY WILL EXPIRE AT
130 PM CDT...
        
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE AREA.
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.

LAT...LON 4275 9051 4283 9043 4269 9043 4269 9052
TIME...MOT...LOC 1823Z 248DEG 35KT 4280 9029 

$$

DAS

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, 12:03 PM CDT	Tornado Warning	ARX	Grant	27 min
Jul 18, 12:31 PM CDT	Tornado Warning	ARX	Grant	44 min

Nearby

Tornado Warnings in Wisconsin, 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.