Alert archive / Wisconsin / Tornado Warnings in 2007

Tornado Warning 9, NWS Twin Cities, MN

May 23, 2007Polk County, Wisconsin

NWS Twin Cities, MN issued this tornado warning at May 23, 2007, 4:48 PM CDT for Polk County, Wisconsin. It was in force for 27 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: May 23, 2007, 4:48 PM CDT (21:48 UTC)
Expired: May 23, 2007, 5:15 PM CDT
In force: 27 min
Issued by: NWS Twin Cities, MN
Area: Counties, with a storm outline in the text

County Polk County, WI

The radar

The Minneapolis radar (KMPX), 114 km from the middle of the area, began a volume at 21:48 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
May 23, 2:58 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 9.8 hours before the alert went out and 117 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: 84 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 811 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 141 m²/s²
0-3 km storm-relative helicity: 164 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 
WFUS53 KMPX 232149
TORMPX
WIC095-232215-
/O.NEW.KMPX.TO.W.0009.070523T2148Z-070523T2215Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
448 PM CDT WED MAY 23 2007

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN POLK COUNTY IN NORTHWEST WISCONSIN...

* UNTIL 515 PM CDT

* AT 447 PM CDT...RADAR INDICATED A STORM CAPABLE OF PRODUCING A
  TORNADO. THE MOST DANGEROUS PART OF THE STORM WAS 13 MILES
  NORTHEAST OF SOMERSET...AND MOVING NORTHEAST AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...
  DERONDA...
  AMERY...
  CLEAR LAKE...
  RANGE...
  JOEL...
  CLAYTON...
  MCKINLEY...

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 4523 9259 4536 9245 4546 9233 4547 9232
      4552 9225 4558 9220 4559 9217 4523 9217

$$
DWE/TDK

1 follow-up statement

000 
WWUS53 KMPX 232214
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
515 PM CDT WED MAY 23 2007

WIC095-232225-
/O.EXP.KMPX.TO.W.0009.000000T0000Z-070523T2215Z/
POLK WI-
515 PM CDT WED MAY 23 2007

...THE TORNADO WARNING FOR POLK COUNTY EXPIRES AT 515 PM CDT...

A STRONG STORM HAD MOVED JUST SOUTHEAST OF TURTLE LAKE...AND HAD 
EXITED POLK COUNTY. THE STORM HAD ALSO WEAKENED QUITE A BIT. 
THEREFORE THE TORNADO WARNING FOR POLK COUNTY WAS ALLOWED TO EXPIRE.

LAT...LON 4523 9259 4536 9245 4546 9233 4547 9232
      4552 9225 4558 9220 4559 9217 4523 9217

$$
DWE/TDK

The office that day

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

Issued	Product	Office	Counties	Lasted
May 23, 3:22 PM CDT	Severe Thunderstorm Warning	MPX	Polk	53 min
May 23, 4:07 PM CDT	Tornado Warning	MPX	Polk	38 min
May 23, 4:24 PM CDT	Severe Thunderstorm Warning	MPX	Barron	66 min
May 23, 4:29 PM CDT	Severe Thunderstorm Warning	MPX	Saint Croix	61 min
May 23, 4:31 PM CDT	Severe Thunderstorm Warning	MPX	Pierce	59 min
May 23, 5:12 PM CDT	Severe Thunderstorm Warning	MPX	Dunn	63 min
May 23, 5:27 PM CDT	Severe Thunderstorm Warning	MPX	Barron	48 min
May 23, 6:04 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Rusk	56 min

Nearby

Tornado Warnings in Wisconsin, 2007 Every tornado warning in 2007 Tornadoes 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.