Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 346, NWS Twin Cities, MN

August 28, 2007Chippewa County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 28, 2007, 1:31 PM CDT for Chippewa County, Wisconsin. It was in force for 44 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: Aug 28, 2007, 1:31 PM CDT (18:31 UTC)
Expired: Aug 28, 2007, 2:15 PM CDT
In force: 44 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), 151 km from the middle of the area, began a volume at 18:31 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, 2:02 PM CDT	TSTM WND DMG	9 E Cornell, WI	TREE TOPPLED ONTO ROAD IN RUBY TOWNSHIP. HAIL ONE QUARTER INCH IN DIAMETER ALSO REPORTED.

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, 12:15 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 6.5 hours before the alert went out and 189 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: 145 J/kg
Mixed-layer CIN: -363 J/kg
Mixed-layer LCL: 1160 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 101 m²/s²
0-3 km storm-relative helicity: 55 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KMPX 281830
SVRMPX
WIC017-281915-
/O.NEW.KMPX.SV.W.0346.070828T1831Z-070828T1915Z/

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

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

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

* UNTIL 215 PM CDT

* AT 127 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM...
  CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 9 MILES WEST OF
  CORNELL...OR ABOUT 16 MILES NORTH OF CHIPPEWA FALLS...AND MOVING
  EAST AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...
  CORNELL...

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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM CDT
TUESDAY EVENING FOR SOUTHEASTERN MINNESOTA.

LAT...LON 4524 9144 4506 9141 4510 9096 4527 9097

$$

1 follow-up statement

000 
WWUS53 KMPX 281900
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
159 PM CDT TUE AUG 28 2007

WIC017-281915-
/O.CON.KMPX.SV.W.0346.000000T0000Z-070828T1915Z/
CHIPPEWA WI-
159 PM CDT TUE AUG 28 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 PM CDT
FOR CHIPPEWA COUNTY...

AT 156 PM CDT...DOPPLER RADAR CONTINUED TO INDICATE A SEVERE
THUNDERSTORM...CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING
WINDS IN EXCESS OF 70 MPH.  THIS STORM WAS LOCATED 7 MILES EAST OF
HOLCOMBE...OR ABOUT 8 MILES EAST OF CORNELL...AND MOVING EAST AT 35
MPH. 

OTHER LOCATIONS IN THE WARNING INCLUDE HOLCOMBE AND CORNELL.

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM
ONE TO TWO MILES EAST OF CORNELL. WHILE NOT IMMEDIATELY LIKELY...A 
TORNADO MAY STILL DEVELOP. IF A TORNADO IS SPOTTED...ACT QUICKLY
AND MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE...SUCH AS A 
BASEMENT OR SMALL INTERIOR ROOM.

LAT...LON 4528 9116 4507 9120 4507 9094 4528 9095

$$

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, 3:20 AM CDT	Severe Thunderstorm Warning	MPX	Pierce, Saint Croix	43 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

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.