Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 59, NWS Twin Cities, MN

April 18, 2004Barron County, Polk County, Wisconsin; Chisago County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Apr 18, 2004, 7:02 PM CDT for Barron County, Polk County, Wisconsin; Chisago County, Minnesota. It was in force for 43 min. 1 report 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 18, 2004, 7:02 PM CDT (00:02 UTC)
Expired: Apr 18, 2004, 7:45 PM CDT
In force: 43 min
Issued by: NWS Twin Cities, MN
Area: Counties, with a storm outline in the text

Counties Chisago County, MN, Barron County, WI, Polk County, WI

The radar

The Duluth radar (KDLH), 145 km from the middle of the area, began a volume at 00:01 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 18, 7:42 PM CDT	TSTM WND DMG	4 W Barron, WI	FEW TREES DOWN.

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 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, 0.0 hours before the alert went out and 150 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.

000 
WUUS53 KMPX 190002
SVRMPX
MNC025-WIC005-095-190045-

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

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CHISAGO COUNTY IN EAST CENTRAL MINNESOTA
  POLK COUNTY IN NORTHWEST WISCONSIN
  BARRON COUNTY IN NORTHWEST WISCONSIN

* UNTIL 745 PM CDT

* AT 702 PM CDT...RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS
  ALONG A LINE EXTENDING FROM 14 MILES NORTH OF HAUGEN TO ST CROIX
  FALLS...OR ALONG A LINE EXTENDING FROM 20 MILES SOUTHWEST OF
  HAYWARD TO 10 MILES SOUTHWEST OF BALSAM LAKE...MOVING EAST AT 30
  MPH.

* LOCATIONS IMPACTED INCLUDE...
  AMERY.
  BALSAM LAKE.
  BARRON.
  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 4589 9179 4537 9285 4521 9212 4527 9162
          4562 9155

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 18, 7:13 PM CDT	Severe Thunderstorm Warning	MPX	Saint Croix	47 min
Apr 18, 7:43 PM CDT	Severe Thunderstorm Warning	MPX	Barron, Polk, Rusk	47 min
Apr 18, 9:00 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Dunn, Eau Claire	60 min
Apr 18, 7:02 PM CDT	Severe Thunderstorm Warning	MPX	Nicollet	58 min
Apr 18, 7:12 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Scott	63 min
Apr 18, 7:19 PM CDT	Severe Thunderstorm Warning	MPX	Sibley	41 min
Apr 18, 7:22 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Faribault	53 min
Apr 18, 7:29 PM CDT	Severe Thunderstorm Warning	MPX	Martin	61 min
Apr 18, 7:33 PM CDT	Severe Thunderstorm Warning	MPX	Carver	42 min
Apr 18, 7:45 PM CDT	Severe Thunderstorm Warning	MPX	Le Sueur, Rice	60 min
Apr 18, 7:54 PM CDT	Tornado Warning	MPX	Scott	36 min
Apr 18, 8:04 PM CDT	Tornado Warning	MPX	Dakota	26 min
Apr 18, 8:17 PM CDT	Severe Thunderstorm Warning	MPX	Faribault, Freeborn, Steele, Waseca	58 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2004 Severe Thunderstorm Warnings in Minnesota, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.