Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 202, NWS Twin Cities, MN

July 30, 2011Barron County, Polk County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 30, 2011, 9:43 PM CDT for Barron County, Polk County, Wisconsin. It was in force for 47 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 30, 2011, 9:43 PM CDT (02:43 UTC)
Expired: Jul 30, 2011, 10:30 PM CDT
In force: 47 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Barron County, WI, Polk County, WI

The radar

The Duluth radar (KDLH), 131 km from the middle of the area, began a volume at 02:46 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 30, 5:31 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 2.7 hours before the alert went out and 147 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: 2387 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 1239 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 176 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 8.4

Open this sounding in Storm Lab

The text

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

697 
WUUS53 KMPX 310243
SVRMPX
WIC005-095-310330-
/O.NEW.KMPX.SV.W.0202.110731T0243Z-110731T0330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
943 PM CDT SAT JUL 30 2011

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN BARRON COUNTY IN NORTHWEST WISCONSIN...
  NORTHEASTERN POLK COUNTY IN NORTHWEST WISCONSIN...

* UNTIL 1030 PM CDT

* AT 939 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH.
  THIS STORM WAS LOCATED NEAR CLAM FALLS...OR ABOUT 20 MILES
  NORTHEAST OF BALSAM LAKE...AND MOVING SOUTHEAST AT 25 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  CLAM FALLS...
  MCKINLEY...
  BARRONETT...
  CUMBERLAND...
  COMSTOCK...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR
DAMAGING WINDS IN EXCESS OF 60 MPH AND LARGE HAIL. SEEK SHELTER NOW
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

REPORT ANY SIGNIFICANT WIND OR HAIL DAMAGE TO THE NEAREST LAW
ENFORCEMENT AGENCY...FOR RELAY TO THE NATIONAL WEATHER SERVICE.

&&

LAT...LON 4572 9215 4565 9214 4565 9189 4561 9182
      4544 9202 4566 9238 4573 9229 4574 9216
TIME...MOT...LOC 0243Z 311DEG 20KT 4568 9218
WIND...HAIL 60MPH 1.00IN

$$

1 follow-up statement

564 
WWUS53 KMPX 310315
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1015 PM CDT SAT JUL 30 2011

WIC095-310330-
/O.CAN.KMPX.SV.W.0202.000000T0000Z-110731T0330Z/
POLK WI-
1015 PM CDT SAT JUL 30 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN POLK COUNTY IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

LAT...LON 4561 9182 4544 9202 4553 9216 4562 9215
      4565 9211 4565 9202 4565 9198 4565 9188
TIME...MOT...LOC 0315Z 311DEG 20KT 4551 9204

$$

WIC005-310330-
/O.CON.KMPX.SV.W.0202.000000T0000Z-110731T0330Z/
BARRON WI-
1015 PM CDT SAT JUL 30 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
BARRON COUNTY UNTIL 1030 PM CDT...

AT 1012 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING
WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR CUMBERLAND...
OR 16 MILES WEST OF RICE LAKE...MOVING SOUTHEAST AT 25 MPH.

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF WESTERN BARRON COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN THE TWIN CITIES.

&&

LAT...LON 4561 9182 4544 9202 4553 9216 4562 9215
      4565 9211 4565 9202 4565 9198 4565 9188
TIME...MOT...LOC 0315Z 311DEG 20KT 4551 9204
WIND...HAIL 60MPH 1.00IN

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 9:54 PM CDT	Areal Flood Advisory	MPX	Pierce	6 hr
Jul 30, 10:44 PM CDT	Special Weather Statement	MPX	Barron	46 min
Jul 30, 11:32 PM CDT	Special Weather Statement	MPX	Pierce	43 min
Jul 30, 11:55 PM CDT	Severe Thunderstorm Warning	MPX	Pepin, Pierce	35 min
Jul 31, 4:00 PM CDT	Heat Advisory	MPX	Chippewa, Dunn, Eau Claire, Pepin, Pierce, Saint Croix	28 hr

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2011 Every severe thunderstorm warning in 2011

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.