Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 5, NWS Twin Cities, MN

April 10, 20114 counties in Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Apr 10, 2011, 4:09 PM CDT for 4 counties in Wisconsin. It was in force for 51 min. 6 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: Apr 10, 2011, 4:09 PM CDT (21:09 UTC)
Expired: Apr 10, 2011, 5:00 PM CDT
In force: 51 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Chippewa County, WI, Dunn County, WI, Eau Claire County, WI, Pepin County, WI

The radar

The La Crosse radar (KARX), 111 km from the middle of the area, began a volume at 21:10 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
Apr 10, 4:12 PM CDT	HAIL 1.75	8 Nne Durand, WI
Apr 10, 4:14 PM CDT	HAIL 0.5	7 S Menomonie, WI
Apr 10, 4:20 PM CDT	HAIL 1	Elk Mound, WI	I-94/HWY 29 EXIT RAMP AREA.
Apr 10, 4:21 PM CDT	HAIL 0.88	2 Nnw Elk Mound, WI
Apr 10, 4:22 PM CDT	HAIL 1	2 Nw Elk Mound, WI	NORTH OF 29 ON HWY 40
Apr 10, 4:22 PM CDT	HAIL 2	2 W Elk Mound, WI

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
Apr 10, 3:19 PM CDT	Tornado Watch PDS	SPC	7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 9.2 hours before the alert went out and 148 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: 552 J/kg
Mixed-layer CIN: -270 J/kg
Mixed-layer LCL: 643 m above ground
0-6 km bulk shear: 80 kt
0-1 km storm-relative helicity: 528 m²/s²
0-3 km storm-relative helicity: 499 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

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

709 
WUUS53 KMPX 102109
SVRMPX
WIC017-033-035-091-102200-
/O.NEW.KMPX.SV.W.0005.110410T2109Z-110410T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
409 PM CDT SUN APR 10 2011

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN CHIPPEWA COUNTY IN WEST CENTRAL WISCONSIN...
  SOUTHEASTERN DUNN COUNTY IN WEST CENTRAL WISCONSIN...
  NORTHWESTERN EAU CLAIRE COUNTY IN WEST CENTRAL WISCONSIN...
  NORTHEASTERN PEPIN COUNTY IN WEST CENTRAL WISCONSIN...

* UNTIL 500 PM CDT

* AT 408 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING HALF DOLLAR SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60
  MPH. THIS STORM WAS LOCATED 7 MILES WEST OF ROCK FALLS...OR ABOUT 8
  MILES NORTHEAST OF DURAND...AND MOVING NORTHEAST AT 65 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  EAU CLAIRE...
  CHIPPEWA FALLS...
  ROCK FALLS...
  CARYVILLE...
  ELK MOUND...
  LAKE HALLIE...
  LAKE WISSOTA...
  INTERSTATE 94...

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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT SUNDAY EVENING
FOR NORTHWESTERN WISCONSIN.

&&

LAT...LON 4460 9174 4459 9189 4459 9195 4474 9199
      4510 9161 4500 9118
TIME...MOT...LOC 2109Z 226DEG 57KT 4470 9181
WIND...HAIL 60MPH 1.25IN

$$

1 follow-up statement

598 
WWUS53 KMPX 102120
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
420 PM CDT SUN APR 10 2011

WIC017-033-035-091-102200-
/O.CON.KMPX.SV.W.0005.000000T0000Z-110410T2200Z/
CHIPPEWA WI-DUNN WI-EAU CLAIRE WI-PEPIN WI-
420 PM CDT SUN APR 10 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
PEPIN...NORTHWESTERN EAU CLAIRE...SOUTHEASTERN DUNN AND SOUTHWESTERN
CHIPPEWA COUNTIES IN WEST CENTRAL WISCONSIN UNTIL 500 PM CDT...

AT 417 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND DAMAGING
WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR 
CARYVILLE...OR 9 MILES WEST OF EAU CLAIRE...MOVING NORTHEAST AT 65 
MPH. GOLF BALL SIZE HAIL WAS REPORTED WITH THIS STORM 8 MILES 
NORTHEAST OF DURAND.

LOCATIONS IMPACTED INCLUDE...
  EAU CLAIRE...CHIPPEWA FALLS...LAKE HALLIE AND LAKE WISSOTA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE HAIL...WHICH CAN
SIGNIFICANTLY DAMAGE WINDOWS...SIDING AND VEHICLES. DAMAGING WINDS
ARE ALSO EXPECTED...WHICH CAN UPROOT TREES AND DOWN POWER LINES. SEEK
SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

&&

LAT...LON 4460 9174 4459 9189 4459 9195 4474 9199
      4510 9161 4500 9118
TIME...MOT...LOC 2120Z 226DEG 57KT 4482 9163
WIND...HAIL 60MPH 1.75IN

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 10, 3:20 PM CDT	Special Weather Statement	MPX	Dunn, Pierce	25 min
Apr 10, 3:34 PM CDT	Severe Thunderstorm Warning	MPX	Barron, Chippewa, Dunn, Pierce, Saint Croix	41 min
Apr 10, 4:07 PM CDT	Special Weather Statement	MPX	Pepin	23 min
Apr 10, 4:19 PM CDT	Special Weather Statement	MPX	Pierce	41 min
Apr 10, 4:19 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Eau Claire, Pepin	41 min
Apr 10, 4:32 PM CDT	Severe Thunderstorm Warning	MPX	Barron, Chippewa, Dunn, Rusk	43 min
Apr 10, 4:41 PM CDT	Tornado Warning	MPX	Chippewa, Eau Claire	49 min
Apr 10, 4:43 PM CDT	Tornado Warning	MPX	Barron, Chippewa, Dunn, Rusk	37 min
Apr 10, 4:52 PM CDT	Tornado Warning	MPX	Eau Claire	23 min
Apr 10, 5:00 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Dunn, Rusk	28 min
Apr 10, 5:14 PM CDT	Tornado Warning	MPX	Eau Claire	16 min

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.