Alert archive / Wisconsin / Tornado Warnings in 2011

Tornado Warning 13, NWS Duluth, MN

September 12, 2011Douglas County, Wisconsin

NWS Duluth, MN issued this tornado warning at Sep 12, 2011, 5:02 PM CDT for Douglas County, Wisconsin. It was in force for 18 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 12, 2011, 5:02 PM CDT (22:02 UTC)
Expired: Sep 12, 2011, 5:20 PM CDT
In force: 18 min
Issued by: NWS Duluth, MN
Area: Storm-based polygon

County Douglas County, WI

The radar

The Duluth radar (KDLH), 30 km from the middle of the area, began a volume at 22:03 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 nearest sounding before it

International Fa, MN (KINL), launched 12:00Z, 10.0 hours before the alert went out and 235 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: 1282 J/kg
Mixed-layer CIN: -118 J/kg
Mixed-layer LCL: 1276 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 220 m²/s²
0-3 km storm-relative helicity: 272 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.5

Open this sounding in Storm Lab

The text

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

649 
WFUS53 KDLH 122202
TORDLH
WIC031-122230-
/O.NEW.KDLH.TO.W.0013.110912T2202Z-110912T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DULUTH MN
502 PM CDT MON SEP 12 2011

THE NATIONAL WEATHER SERVICE IN DULUTH MN HAS ISSUED A

* TORNADO WARNING FOR...
  NORTH CENTRAL DOUGLAS COUNTY IN NORTHWEST WISCONSIN...

* UNTIL 530 PM CDT

* AT 458 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 9 MILES
  NORTHWEST OF WENTWORTH...OR NEAR SUPERIOR...MOVING EAST AT 35 MPH.

* THIS VERY DANGEROUS STORM WILL BE NEAR...
  WENTWORTH BY 510 PM...
  POPLAR BY 515 PM...
  CLOVERLAND BY 520 PM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

&&

LAT...LON 4668 9204 4671 9202 4671 9199 4669 9196
      4670 9188 4670 9182 4673 9172 4671 9164
      4655 9180
TIME...MOT...LOC 2202Z 292DEG 28KT 4670 9191

$$

TENTINGER

1 follow-up statement

782 
WWUS53 KDLH 122220
SVSDLH

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DULUTH MN
520 PM CDT MON SEP 12 2011

WIC031-122230-
/O.CAN.KDLH.TO.W.0013.000000T0000Z-110912T2230Z/
DOUGLAS WI-
520 PM CDT MON SEP 12 2011

...THE TORNADO WARNING FOR NORTH CENTRAL DOUGLAS COUNTY IS
CANCELLED...

THE TORNADO THREAT HAS DIMINISHED...THEREFORE THE TORNADO WARNING HAS
BEEN CANCELLED. HOWEVER...A SEVERE THUNDERSTORM WARNING REMAINS IN
EFFECT FOR THE AREA.  HOWEVER SMALL HAIL IS STILL POSSIBLE WITH THIS
THUNDERSTORM.

REMEMBER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR 
NORTHERN DOUGLAS COUNTY UNTIL 6 PM.

LAT...LON 4668 9204 4671 9202 4671 9199 4669 9196
      4670 9188 4670 9182 4673 9172 4671 9164
      4655 9180
TIME...MOT...LOC 2220Z 292DEG 28KT 4664 9171

$$

TENTINGER

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 12, 4:41 PM CDT	Special Weather Statement	DLH	Douglas	19 min
Sep 12, 4:45 PM CDT	Special Weather Statement	DLH	Douglas	30 min
Sep 12, 4:47 PM CDT	Severe Thunderstorm Warning	DLH	Douglas	13 min
Sep 12, 5:19 PM CDT	Severe Thunderstorm Warning	DLH	Bayfield, Douglas	24 min
Sep 12, 5:31 PM CDT	Severe Thunderstorm Warning	DLH	Bayfield, Douglas	29 min
Sep 12, 5:54 PM CDT	Special Weather Statement	DLH	Bayfield	36 min
Sep 12, 6:00 PM CDT	Severe Thunderstorm Warning	DLH	Bayfield, Douglas, Sawyer	45 min
Sep 12, 6:15 PM CDT	Special Weather Statement	DLH	Ashland, Iron	60 min
Sep 12, 6:41 PM CDT	Severe Thunderstorm Warning	DLH	Ashland, Bayfield, Sawyer	34 min
Sep 12, 6:50 PM CDT	Special Weather Statement	DLH	Iron	25 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.