Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 36, NWS Twin Cities, MN

April 18, 2004Polk County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Apr 18, 2004, 7:24 AM CDT for Polk County, Wisconsin. It was in force for 36 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, 7:24 AM CDT (12:24 UTC)
Expired: Apr 18, 2004, 8:00 AM CDT
In force: 36 min
Issued by: NWS Twin Cities, MN
Area: Counties, with a storm outline in the text

County Polk County, WI

The radar

The Duluth radar (KDLH), 131 km from the middle of the area, began a volume at 12:23 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

Minneapolis, MN (KMPX), launched 12:00Z, 0.4 hours before the alert went out and 135 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: 680 J/kg
Mixed-layer CIN: -274 J/kg
Mixed-layer LCL: 697 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 361 m²/s²
0-3 km storm-relative helicity: 401 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.3

Open this sounding in Storm Lab

The text

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

251 
WUUS53 KMPX 181224
SVRMPX
WIC095-181300-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
723 AM 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

* UNTIL 800 AM CDT

* AT 723 AM CDT...RADAR INDICATED A SEVERE THUNDERSTORM WITH LARGE
  HAIL OVER POLK COUNTY...OR ABOUT 12 MILES NORTHEAST OF BALSAM
  LAKE...MOVING NORTHEAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
LUCK.
LORAINE.
FREDERIC.
LEWIS.
CLAM FALLS.

THIS IS A DANGEROUS STORM WITH LARGE HAIL...STAY INDOORS AWAY FROM
WINDOWS.

LAT...LON 4570 9243 4554 9230 4563 9217 4574 9225

$$
MARGRAF

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 17, 10:47 PM CDT	Severe Thunderstorm Warning	MPX	Eau Claire	28 min
Apr 17, 11:20 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa	55 min
Apr 18, 1:23 AM CDT	Severe Thunderstorm Warning	MPX	Pierce	67 min
Apr 18, 1:34 AM CDT	Severe Thunderstorm Warning	MPX	Barron	41 min
Apr 18, 1:52 AM CDT	Severe Thunderstorm Warning	MPX	Saint Croix	38 min
Apr 18, 1:57 AM CDT	Severe Thunderstorm Warning	MPX	Pepin	48 min
Apr 18, 1:59 AM CDT	Severe Thunderstorm Warning	MPX	Rusk	46 min
Apr 18, 2:09 AM CDT	Severe Thunderstorm Warning	MPX	Dunn	51 min
Apr 18, 2:16 AM CDT	Severe Thunderstorm Warning	MPX	Barron	29 min
Apr 18, 2:24 AM CDT	Severe Thunderstorm Warning	MPX	Saint Croix	36 min
Apr 18, 2:42 AM CDT	Severe Thunderstorm Warning	MPX	Eau Claire, Pepin	48 min
Apr 18, 4:42 PM CDT	Severe Thunderstorm Warning	MPX	Polk	48 min
Apr 18, 6:16 PM CDT	Severe Thunderstorm Warning	MPX	Polk	44 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.