Alert archive / Wisconsin / Tornado Warnings in 2011

Tornado Warning 4, NWS Twin Cities, MN

April 10, 2011Eau Claire County, Wisconsin

NWS Twin Cities, MN issued this tornado warning at Apr 10, 2011, 5:14 PM CDT for Eau Claire County, Wisconsin. It was in force for 16 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: Apr 10, 2011, 5:14 PM CDT (22:14 UTC)
Expired: Apr 10, 2011, 5:30 PM CDT
In force: 16 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon

County Eau Claire County, WI

The radar

The La Crosse radar (KARX), 105 km from the middle of the area, began a volume at 22:14 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
Apr 10, 3:19 PM CDT	Tornado Watch PDS	SPC	7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 10.2 hours before the alert went out and 206 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.

155 
WFUS53 KMPX 102214
TORMPX
WIC035-102230-
/O.NEW.KMPX.TO.W.0004.110410T2214Z-110410T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
514 PM CDT SUN APR 10 2011

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN EAU CLAIRE COUNTY IN WEST CENTRAL WISCONSIN...

* UNTIL 530 PM CDT

* AT 512 PM CDT...RADAR INDICATED A STORM CAPABLE OF PRODUCING A     
  TORNADO. THE MOST DANGEROUS PART OF THE STORM WAS JUST EAST OF     
  LUDINGTON...OR ABOUT 9 MILES SOUTHEAST OF LUDINGTON...AND MOVING   
  EAST AT 50 MPH.

* LOCATIONS IN THE WARNING INCLUDE...
  MAINLY RURAL AREAS OF EXTREME EASTERN EAU CLAIRE COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WHEN A TORNADO WARNING IS ISSUED BASED ON RADAR...IT MEANS THAT
STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY ALREADY
BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY.

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

&&

LAT...LON 4470 9108 4478 9110 4484 9092 4481 9091
      4473 9091 4473 9092
TIME...MOT...LOC 2213Z 254DEG 45KT 4476 9096

$$

1 follow-up statement

972 
WWUS53 KMPX 102222
SVSMPX

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

WIC035-102232-
/O.EXP.KMPX.TO.W.0004.000000T0000Z-110410T2230Z/
EAU CLAIRE WI-
522 PM CDT SUN APR 10 2011

...THE TORNADO WARNING FOR NORTHEASTERN EAU CLAIRE COUNTY IN WEST
CENTRAL WISCONSIN WILL EXPIRE AT 530 PM CDT...

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

A TORNADO WATCH REMAINS IN EFFECT.

LAT...LON 4470 9108 4478 9110 4484 9092 4481 9091
      4473 9091 4473 9092
TIME...MOT...LOC 2222Z 254DEG 45KT 4479 9081

$$

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, 4:09 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Dunn, Eau Claire, Pepin	51 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

Nearby

Tornado Warnings in Wisconsin, 2011 Every tornado warning in 2011 Tornadoes 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.