Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 79, NWS Twin Cities, MN

July 12, 2015Polk County, Saint Croix County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 12, 2015, 9:59 PM CDT for Polk County, Saint Croix County, Wisconsin. It was in force for 61 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 12, 2015, 9:59 PM CDT (02:59 UTC)
Expired: Jul 12, 2015, 11:00 PM CDT
In force: 61 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

Counties Polk County, WI, Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 89 km from the middle of the area, began a volume at 02:59 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 12, 10:00 PM CDT	TSTM WND DMG	Luck, WI	TREES DOWN

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 12, 5:28 PM CDT	Tornado Watch	SPC	5 hr
Jul 12, 9:59 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 3.0 hours before the alert went out and 91 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: 3598 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 1040 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 124 m²/s²
0-3 km storm-relative helicity: 116 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 12.7

Open this sounding in Storm Lab

The text

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

798 
WUUS53 KMPX 130259
SVRMPX
WIC095-109-130400-
/O.NEW.KMPX.SV.W.0079.150713T0259Z-150713T0400Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
959 PM CDT SUN JUL 12 2015

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ST. CROIX COUNTY IN WEST CENTRAL WISCONSIN...
  POLK COUNTY IN NORTHWESTERN WISCONSIN...

* UNTIL 1100 PM CDT

* AT 959 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR WOLF
  CREEK...OR 25 MILES EAST OF CAMBRIDGE...MOVING SOUTHEAST AT 35 MPH.

  HAZARD...60 MPH WIND GUSTS AND NICKEL SIZE HAIL. 

  SOURCE...RADAR INDICATED. 

  IMPACT...EXPECT DAMAGE TO ROOFS...SIDING AND TREES. 

* THIS SEVERE THUNDERSTORM WILL BE NEAR...
  ST. CROIX FALLS AROUND 1010 PM CDT.
  CENTURIA AND MILLTOWN AROUND 1015 PM CDT.
  BALSAM LAKE AROUND 1020 PM CDT.
  AMERY AROUND 1035 PM CDT.
  CLEAR LAKE AND TURTLE LAKE AROUND 1045 PM CDT.
  CLAYTON AROUND 1050 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE
BURKHARDT...RANGE...DEER PARK...HOULTON...NEW RICHMOND AIRPORT...
HUNTINGTON...CYLON...MCKINLEY...EMERALD AND FOREST.

THIS INCLUDES INTERSTATE 94 IN WISCONSIN BETWEEN MILE MARKERS 1 AND
30.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

TORRENTIAL RAINFALL IS OCCURRING WITH THIS STORM...AND MAY LEAD TO
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

&&

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM CDT FOR EAST CENTRAL
MINNESOTA AND NORTHWESTERN WISCONSIN.

LAT...LON 4572 9215 4486 9215 4486 9277 4494 9275
      4497 9277 4509 9277 4512 9274 4519 9277
      4521 9269 4530 9264 4573 9251
TIME...MOT...LOC 0259Z 298DEG 30KT 4548 9272 

HAIL...0.88IN
WIND...60MPH
 
$$

DWE

1 follow-up statement

304 
WWUS53 KMPX 130349
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1049 PM CDT SUN JUL 12 2015

WIC095-109-130400-
/O.CON.KMPX.SV.W.0079.000000T0000Z-150713T0400Z/
ST. CROIX WI-POLK WI-
1049 PM CDT SUN JUL 12 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM CDT
FOR ST. CROIX AND SOUTHEASTERN POLK COUNTIES...

AT 1049 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR CLAYTON...OR
26 MILES SOUTHWEST OF RICE LAKE...MOVING SOUTHEAST AT 35 MPH.

HAZARD...60 MPH WIND GUSTS. 

SOURCE...RADAR INDICATED. 

IMPACT...EXPECT DAMAGE TO ROOFS...SIDING AND TREES. 

LOCATIONS IMPACTED INCLUDE...
RIVER FALLS...HUDSON...NEW RICHMOND...NORTH HUDSON...BAYPORT...
AMERY...SOMERSET...BALDWIN...HAMMOND...ROBERTS...WOODVILLE AND
GLENWOOD CITY.

THIS INCLUDES INTERSTATE 94 IN WISCONSIN BETWEEN MILE MARKERS 1 AND
30.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

TORRENTIAL RAINFALL IS OCCURRING WITH THIS STORM...AND MAY LEAD TO
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

&&

LAT...LON 4566 9216 4486 9215 4486 9277 4494 9275
      4497 9277 4509 9277 4512 9274 4519 9277
      4521 9269 4522 9260 4534 9247
TIME...MOT...LOC 0349Z 298DEG 30KT 4528 9220 

HAIL...<.75IN
WIND...60MPH
 
$$

DWE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 9:24 PM CDT	Severe Thunderstorm Warning	MPX	Polk	51 min
Jul 12, 9:48 PM CDT	Severe Thunderstorm Warning	MPX	Polk	57 min
Jul 12, 10:18 PM CDT	Severe Thunderstorm Warning	MPX	Barron, Dunn	57 min
Jul 12, 10:45 PM CDT	Special Weather Statement	MPX	Saint Croix	60 min
Jul 12, 11:26 PM CDT	Severe Thunderstorm Warning	MPX	Barron, Chippewa, Dunn, Rusk	49 min
Jul 12, 11:40 PM CDT	Special Weather Statement	MPX	Dunn, Pepin, Pierce	50 min
Jul 13, 12:03 AM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Dunn, Eau Claire	42 min
Jul 13, 12:17 AM CDT	Special Weather Statement	MPX	Rusk	28 min
Jul 13, 12:37 AM CDT	Special Weather Statement	MPX	Eau Claire	23 min
Jul 13, 12:41 AM CDT	Special Weather Statement	MPX	Pepin	64 min
Jul 13, 2:47 AM CDT	Special Weather Statement	MPX	Saint Croix	58 min
Jul 13, 2:56 PM CDT	Special Weather Statement	MPX	Polk	34 min
Jul 13, 3:00 PM CDT	Severe Thunderstorm Warning	MPX	Polk	45 min
Jul 13, 3:49 PM CDT	Special Weather Statement	MPX	Polk	41 min
Jul 13, 4:03 PM CDT	Severe Thunderstorm Warning	MPX	Polk	21 min
Jul 13, 4:13 PM CDT	Severe Thunderstorm Warning	MPX	Polk	28 min
Jul 13, 4:36 PM CDT	Special Weather Statement	MPX	Dunn	39 min
Jul 13, 5:25 PM CDT	Special Weather Statement	MPX	Eau Claire	20 min
Jul 13, 5:41 PM CDT	Severe Thunderstorm Warning	MPX	Dunn, Saint Croix	31 min
Jul 13, 6:03 PM CDT	Severe Thunderstorm Warning	MPX	Dunn, Pepin	31 min
Jul 13, 6:22 PM CDT	Severe Thunderstorm Warning	MPX	Eau Claire	23 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2015 Every severe thunderstorm warning 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.