Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 340, NWS Twin Cities, MN

August 28, 2007Pierce County, Saint Croix County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 28, 2007, 3:20 AM CDT for Pierce County, Saint Croix County, Wisconsin. It was in force for 43 min. 2 reports 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: Aug 28, 2007, 3:20 AM CDT (08:20 UTC)
Expired: Aug 28, 2007, 4:03 AM CDT
In force: 43 min
Issued by: NWS Twin Cities, MN
Area: Counties, with a storm outline in the text

Counties Pierce County, WI, Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 79 km from the middle of the area, began a volume at 08:20 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
Aug 28, 3:29 AM CDT	TSTM WND DMG	Hudson, WI	TREE DOWN. TIME ESTIMATED.
Aug 28, 3:35 AM CDT	TSTM WND DMG	River Falls, 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
Aug 28, 1:56 AM CDT	Severe Thunderstorm Watch	SPC	3 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 8.3 hours before the alert went out and 81 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: 2564 J/kg
Mixed-layer CIN: -230 J/kg
Mixed-layer LCL: 806 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 379 m²/s²
0-3 km storm-relative helicity: 526 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 8.1

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KMPX 280822
SVRMPX
WIC093-109-280915-
/O.NEW.KMPX.SV.W.0340.070828T0820Z-070828T0915Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
320 AM CDT TUE AUG 28 2007

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

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

* UNTIL 415 AM CDT

* AT 316 AM CDT...DOPPLER RADAR INDICATED A LINE OF SEVERE           
  THUNDERSTORMS...CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND       
  DAMAGING WINDS IN EXCESS OF 65 MPH.  THESE STORMS WERE LOCATED     
  ALONG A LINE EXTENDING FROM 13 MILES NORTHWEST OF HUDSON TO 8      
  MILES SOUTHWEST OF HUDSON TO 17 MILES SOUTHWEST OF RIVER           
  FALLS...AND MOVING EAST AT 55 MPH.

* LOCATIONS IMPACTED INCLUDE...
  HUDSON...
  RIVER FALLS...
  SOMERSET...
  ELLSWORTH...
  NEW RICHMOND...
  BALDWIN...
  SPRING VALLEY...
  GLENWOOD CITY...

DAMAGING WINDS UP TO 71 MPH WERE REPORTED AT THE MINNEAPOLIS ST PAUL 
INTERNATIONAL AIRPORT WITH THESE STORMS.

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 600 AM CDT
TUESDAY MORNING FOR SOUTHEASTERN MINNESOTA.

LAT...LON 4512 9274 4508 9279 4498 9275 4491 9277
      4485 9277 4477 9279 4473 9278 4471 9273
      4473 9241 4480 9225 4503 9217 4520 9216
      4521 9226 4519 9259

$$

2 follow-up statements

000 
WWUS53 KMPX 280837
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
335 AM CDT TUE AUG 28 2007

WIC093-109-280915-
/O.CON.KMPX.SV.W.0340.000000T0000Z-070828T0915Z/
ST. CROIX WI-PIERCE WI-
335 AM CDT TUE AUG 28 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 AM CDT
FOR PIERCE AND ST. CROIX COUNTIES...

AT 315 AM CDT...DAMAGING WINDS OF 60 MPH WERE MEASURED IN ST PAUL 
WITH THIS STORM. AT 335 AM CDT...LARGE TREES WERE REPORTED DOWN BY 
LAW ENFORCEMENT IN RIVER FALLS.

AT 335 AM CDT...DOPPLER RADAR CONTINUED TO INDICATE A LINE OF SEVERE
THUNDERSTORMS...CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING
WINDS IN EXCESS OF 65 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM 4 MILES NORTHWEST OF BOARDMAN TO 5 MILES NORTH OF
RIVER FALLS TO 7 MILES WEST OF BELDENVILLE...AND MOVING EAST AT 55
MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE MARTEL...HOULTON...
HERSEY...FOREST...EMERALD...CYLON...BURKHARDT...BOARDMAN...
BELDENVILLE...WOODVILLE...AND INTERSTATE 94.

THIS STORM HAS A HISTORY OF PRODUCING WIDESPREAD WIND DAMAGE ACROSS 
THE SOUTH SIDE OF THE TWIN CITIES. THIS IS A DANGEROUS SITUATION. 
SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM 
WINDOWS

LAT...LON 4517 9229 4506 9277 4498 9275 4491 9277
      4485 9277 4477 9279 4473 9278 4471 9273
      4463 9261 4463 9242 4465 9214 4497 9215
      4518 9216

$$

000 
WWUS53 KMPX 280903
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
402 AM CDT TUE AUG 28 2007

WIC093-109-280912-
/O.CAN.KMPX.SV.W.0340.000000T0000Z-070828T0915Z/
ST. CROIX WI-PIERCE WI-
402 AM CDT TUE AUG 28 2007

...THE SEVERE THUNDERSTORM WARNING FOR PIERCE AND ST. CROIX COUNTIES
IS CANCELLED...

RADAR INDICATED THAT THE SEVERE THUNDERSTORM WHICH PROMPTED THE 
WARNING HAD MOVED OUT OF PIERCE AND ST. CROIX COUNTIES. THUS THE 
WARNING HAS BEEN CANCELLED.

REPORT ANY SEVERE WEATHER TO YOUR LOCAL LAW ENFORCEMENT FOR RELAY TO 
THE NATIONAL WEATHER SERVICE.

LAT...LON 4517 9229 4506 9277 4498 9275 4491 9277
      4485 9277 4477 9279 4473 9278 4471 9273
      4463 9261 4463 9242 4465 9214 4497 9215
      4518 9216

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 28, 12:03 AM CDT	Severe Thunderstorm Warning	MPX	Rusk	57 min
Aug 28, 1:52 AM CDT	Severe Thunderstorm Warning	MPX	Barron, Polk	53 min
Aug 28, 3:40 AM CDT	Severe Thunderstorm Warning	MPX	Dunn	49 min
Aug 28, 3:52 AM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Eau Claire	53 min
Aug 28, 1:31 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa	44 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2007 Every severe thunderstorm warning in 2007

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.