Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 67, NWS Twin Cities, MN

April 18, 2004Barron County, Polk County, Rusk County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Apr 18, 2004, 7:43 PM CDT for Barron County, Polk County, Rusk County, Wisconsin. It was in force for 47 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 18, 2004, 7:43 PM CDT (00:43 UTC)
Expired: Apr 18, 2004, 8:30 PM CDT
In force: 47 min
Issued by: NWS Twin Cities, MN
Area: Counties, with a storm outline in the text

Counties Barron County, WI, Polk County, WI, Rusk County, WI

The radar

The Duluth radar (KDLH), 154 km from the middle of the area, began a volume at 00:46 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 18, 1:40 PM CDT	Tornado Watch	SPC	6 hr
Apr 18, 6:35 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 0.7 hours before the alert went out and 169 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: 671 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 2341 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 244 m²/s²
0-3 km storm-relative helicity: 328 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.7

Open this sounding in Storm Lab

The text

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

958 
WUUS53 KMPX 190043
SVRMPX
WIC005-095-107-190130-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
742 PM CDT SUN APR 18 2004

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  POLK COUNTY IN NORTHWEST WISCONSIN
  BARRON COUNTY IN NORTHWEST WISCONSIN
  RUSK COUNTY IN NORTHWEST WISCONSIN

* UNTIL 830 PM CDT

* AT 742 PM CDT...RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS
  ALONG A LINE EXTENDING FROM 16 MILES NORTHEAST OF HAUGEN TO 6 MILES
  NORTH OF PRAIRIE FARM...OR ALONG A LINE EXTENDING FROM 19 MILES
  NORTHEAST OF RICE LAKE TO 15 MILES SOUTHWEST OF RICE LAKE...MOVING
  SOUTHEAST AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...
  AMERY.
  BARRON.
  LADYSMITH.
  RICE LAKE.
  TURTLE LAKE.

THIS IS A DANGEROUS STORM...STAY INDOORS AWAY FROM WINDOWS. SEVERE
THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING.

LAT...LON 4581 9145 4536 9259 4525 9272 4523 9188
          4541 9079 4565 9071

$$
RJN

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 18, 7:02 PM CDT	Severe Thunderstorm Warning	MPX	Barron, Polk	43 min
Apr 18, 7:13 PM CDT	Severe Thunderstorm Warning	MPX	Saint Croix	47 min
Apr 18, 9:00 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Dunn, Eau Claire	60 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2004 Every severe thunderstorm warning in 2004

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.