Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 384, NWS Twin Cities, MN

September 20, 2007Chippewa County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Sep 20, 2007, 10:11 PM CDT for Chippewa County, Wisconsin. It was in force for 64 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: Sep 20, 2007, 10:11 PM CDT (03:11 UTC)
Expired: Sep 20, 2007, 11:15 PM CDT
In force: 64 min
Issued by: NWS Twin Cities, MN
Area: Counties, with a storm outline in the text

County Chippewa County, WI

The radar

The La Crosse radar (KARX), 136 km from the middle of the area, began a volume at 03:11 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
Sep 20, 5:37 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 3.2 hours before the alert went out and 179 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: 1394 J/kg
Mixed-layer CIN: -85 J/kg
Mixed-layer LCL: 838 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 192 m²/s²
0-3 km storm-relative helicity: 567 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 24.8

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KMPX 210311
SVRMPX
WIC017-210415-
/O.NEW.KMPX.SV.W.0384.070921T0311Z-070921T0415Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1011 PM CDT THU SEP 20 2007

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CHIPPEWA COUNTY IN WEST CENTRAL WISCONSIN...

* UNTIL 1115 PM CDT

* AT 1007 PM CDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
  THUNDERSTORMS...CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED
  ALONG A LINE EXTENDING FROM 14 MILES NORTHWEST OF CORNELL TO 15
  MILES WEST OF CHIPPEWA FALLS...AND MOVING EAST AT 40 MPH.

* LOCATIONS IMPACTED INCLUDE...
  CHIPPEWA FALLS...
  CORNELL...
  LAKE WISSOTA...
  STANLEY...

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING. PREPARE TO MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE
SUCH AS A BASEMENT OR SMALL INTERIOR ROOM IF A TORNADO IS SPOTTED.

STAY INDOORS...AND AWAY FROM WINDOWS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 100 AM CDT FRIDAY
MORNING FOR NORTHWESTERN WISCONSIN.

LAT...LON 4487 9163 4529 9153 4529 9095 4487 9094
TIME...MOT...LOC 0311Z 269DEG 37KT 4532 9127 4494 9164

$$

JPR

2 follow-up statements

000 
WWUS53 KMPX 210338
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1037 PM CDT THU SEP 20 2007

WIC017-210415-
/O.CON.KMPX.SV.W.0384.000000T0000Z-070921T0415Z/
CHIPPEWA WI-
1037 PM CDT THU SEP 20 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM CDT
FOR CHIPPEWA COUNTY...

AT 1035 PM CDT...DOPPLER RADAR CONTINUED TO INDICATE A SEVERE
THUNDERSTORM...CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND DAMAGING
WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR JIM FALLS...
OR ABOUT 8 MILES NORTH OF LAKE WISSOTA...AND MOVING EAST AT 40 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE JIM FALLS...HOLCOMBE...
BATEMAN...STANLEY...LAKE WISSOTA...CORNELL...CADOTT AND BOYD.

LAT...LON 4487 9094 4488 9113 4487 9114 4487 9138
      4528 9134 4529 9095 4505 9094 4504 9096
      4502 9094
TIME...MOT...LOC 0337Z 269DEG 37KT 4504 9121

$$

JPR

000 
WWUS53 KMPX 210406
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1106 PM CDT THU SEP 20 2007

WIC017-210416-
/O.EXP.KMPX.SV.W.0384.000000T0000Z-070921T0415Z/
CHIPPEWA WI-
1106 PM CDT THU SEP 20 2007

...THE SEVERE THUNDERSTORM WARNING FOR CHIPPEWA COUNTY EXPIRES AT
1115 PM CDT...

SEVERE STORMS WERE ABOUT TO MOVE OUT OF THE COUNTY. HOWEVER...MORE 
THUNDERSTORMS ARE POSSIBLE...REMAIN ALERT FOR POSSIBLE 
ADDITIONAL WARNINGS.

LAT...LON 4487 9094 4488 9113 4487 9114 4487 9138
      4528 9134 4529 9095 4505 9094 4504 9096
      4502 9094
TIME...MOT...LOC 0406Z 269DEG 37KT 4499 9079

$$

JPR

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 20, 8:51 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Dunn, Eau Claire	21 min
Sep 20, 9:29 PM CDT	Severe Thunderstorm Warning	MPX	Dunn, Saint Croix	61 min
Sep 20, 9:44 PM CDT	Severe Thunderstorm Warning	MPX	Barron, Polk	31 min
Sep 20, 10:16 PM CDT	Severe Thunderstorm Warning	MPX	Barron	44 min
Sep 21, 5:54 AM CDT	Severe Thunderstorm Warning	MPX	Polk	36 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.