Alert archive / Wisconsin / Tornado Warnings in 2015

Tornado Warning 25, NWS Twin Cities, MN

July 18, 2015Dunn County, Pepin County, Wisconsin

NWS Twin Cities, MN issued this tornado warning at Jul 18, 2015, 1:52 AM CDT for Dunn County, Pepin County, Wisconsin. It was in force for 23 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: Jul 18, 2015, 1:52 AM CDT (06:52 UTC)
Expired: Jul 18, 2015, 2:15 AM CDT
In force: 23 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

Counties Dunn County, WI, Pepin County, WI

The radar

The La Crosse radar (KARX), 105 km from the middle of the area, began a volume at 06:54 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

Time	Report	Where	Remark
Jul 18, 1:52 AM CDT	TORNADO 1	1 N Eau Galle, WI	OFFICIAL STORM SURVEY SHOWED AN 8 MILE LONG DAMAGE PATH FROM 147 AM TO 159 AM. 88 MPH WIND MEASURED 1 MILE NORTH OF EAU GALLE AT 152 AM. MAINLY TREE DAMAGE WAS OBSERVED.

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
Jul 18, 12:41 AM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 6.9 hours before the alert went out and 143 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: 888 J/kg
Mixed-layer CIN: -162 J/kg
Mixed-layer LCL: 1752 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 104 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.

112 
WFUS53 KMPX 180652
TORMPX
WIC033-091-180715-
/O.NEW.KMPX.TO.W.0025.150718T0652Z-150718T0715Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
152 AM CDT SAT JUL 18 2015

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN PEPIN COUNTY IN WEST CENTRAL WISCONSIN...
  SOUTHEASTERN DUNN COUNTY IN WEST CENTRAL WISCONSIN...

* UNTIL 215 AM CDT
    
* AT 152 AM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED OVER EAU GALLE...OR 13 MILES SOUTHWEST OF
  MENOMONIE...MOVING EAST AT 45 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 TORNADIC THUNDERSTORM WILL REMAIN OVER MAINLY RURAL AREAS OF
  NORTHEASTERN PEPIN AND SOUTHEASTERN DUNN COUNTIES...INCLUDING THE
  FOLLOWING LOCATIONS...CARYVILLE...DOWNSVILLE AND ROCK FALLS.

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 4459 9168 4460 9199 4462 9202 4479 9203
      4482 9165 4460 9165
TIME...MOT...LOC 0652Z 272DEG 41KT 4471 9201 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

1 follow-up statement

301 
WWUS53 KMPX 180707
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
207 AM CDT SAT JUL 18 2015

WIC033-091-180716-
/O.EXP.KMPX.TO.W.0025.000000T0000Z-150718T0715Z/
PEPIN WI-DUNN WI-
207 AM CDT SAT JUL 18 2015

...THE TORNADO WARNING FOR NORTHEASTERN PEPIN AND SOUTHEASTERN DUNN
COUNTIES WILL EXPIRE AT 215 AM CDT...
                
THE STORM WHICH PROMPTED THE WARNING NO LONGER APPEARS CAPABLE OF PRODUCING
 A TORNADO. THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.  HOWEVER GUSTY WINDS
ARE STILL POSSIBLE WITH THIS THUNDERSTORM.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 AM CDT FOR
WEST CENTRAL WISCONSIN.

LAT...LON 4459 9168 4460 9199 4462 9202 4479 9203
      4482 9165 4460 9165
TIME...MOT...LOC 0705Z 272DEG 41KT 4471 9201 

$$

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 18, 12:55 AM CDT	Severe Thunderstorm Warning	MPX	Pierce	50 min
Jul 18, 1:06 AM CDT	Severe Thunderstorm Warning	MPX	Polk, Saint Croix	39 min
Jul 18, 1:27 AM CDT	Severe Thunderstorm Warning	MPX	Barron, Dunn, Pepin, Pierce, Polk, Saint Croix	48 min
Jul 18, 2:00 AM CDT	Severe Thunderstorm Warning	MPX	Barron, Chippewa, Dunn, Eau Claire, Pepin	60 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.