Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 39, NWS La Crosse, WI

April 18, 2002Clark County, Wisconsin

NWS La Crosse, WI issued this severe thunderstorm warning at Apr 18, 2002, 6:22 PM CDT for Clark County, Wisconsin. It was in force for 53 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Apr 18, 2002, 6:22 PM CDT (23:22 UTC)
Expired: Apr 18, 2002, 7:15 PM CDT
In force: 53 min
Issued by: NWS La Crosse, WI
Area: Whole counties

County Clark County, WI

What was reported inside it

Time	Report	Where	Remark
Apr 18, 6:33 PM CDT	Hail 0.75	Colby, WI
Apr 18, 6:40 PM CDT	Hail 0.75	Greenwood, WI

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

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, 2:30 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 11.4 hours before the alert went out and 201 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1774 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 460 m²/s²
0-3 km storm-relative helicity: 766 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.1

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KARX 182322
SVRLSE
WIC019-190015-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
620 PM CDT THU APR 18 2002

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CLARK COUNTY IN CENTRAL WISCONSIN

* UNTIL 715 PM CDT

* AT 620 PM CDT...WEATHER SPOTTERS REPORTED A LINE OF SEVERE
  THUNDERSTORMS PRODUCING LARGE HAIL FROM 20 MILES NORTHEAST OF
  WHITEHALL TO 21 MILES SOUTHWEST OF MEDFORD...MOVING NORTHEAST AT 40
  MPH.

* THE SEVERE THUNDERSTORMS ARE EXPECTED TO BE...
  NEAR OWEN AT 635 PM CDT...
  NEAR NEILLSVILLE...AND SHORTVILLE AT 645 PM CDT...
  NEAR LOYAL AT 650 PM CDT...
 

THIS EXTENDS THE CURRENT WARNING. A TORNADO WATCH REMAINS IN EFFECT 
UNTIL 800 PM.

THESE STORMS HAVE A HISTORY OF LARGE HAIL. FOR YOUR PROTECTION...SEEK 
SHELTER IN A STURDY BUILDING AND STAY AWAY FROM WINDOWS.

BAUMGARDT

&

The office that day

Everything else NWS La Crosse, WI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 18, 2:26 AM CDT	Severe Thunderstorm Warning	ARX	Vernon	64 min
Apr 18, 4:14 AM CDT	Severe Thunderstorm Warning	ARX	Crawford	61 min
Apr 18, 4:44 AM CDT	Severe Thunderstorm Warning	ARX	Richland	61 min
Apr 18, 2:12 PM CDT	Severe Thunderstorm Warning	ARX	Grant	48 min
Apr 18, 2:57 PM CDT	Tornado Warning	ARX	Grant	63 min
Apr 18, 2:59 PM CDT	Severe Thunderstorm Warning	ARX	Richland	46 min
Apr 18, 3:48 PM CDT	Severe Thunderstorm Warning	ARX	Adams, Juneau	57 min
Apr 18, 4:21 PM CDT	Severe Thunderstorm Warning	ARX	Taylor	54 min
Apr 18, 4:56 PM CDT	Severe Thunderstorm Warning	ARX	Juneau, Vernon	49 min
Apr 18, 5:03 PM CDT	Severe Thunderstorm Warning	ARX	Taylor	42 min
Apr 18, 5:14 PM CDT	Severe Thunderstorm Warning	ARX	Monroe	46 min
Apr 18, 5:25 PM CDT	Severe Thunderstorm Warning	ARX	Clark	65 min
Apr 18, 5:36 PM CDT	Severe Thunderstorm Warning	ARX	Buffalo	54 min
Apr 18, 5:44 PM CDT	Severe Thunderstorm Warning	ARX	Taylor	61 min
Apr 18, 5:47 PM CDT	Severe Thunderstorm Warning	ARX	Adams, Juneau	58 min
Apr 18, 6:04 PM CDT	Severe Thunderstorm Warning	ARX	Trempealeau	56 min
Apr 18, 6:17 PM CDT	Severe Thunderstorm Warning	ARX	La Crosse	88 min
Apr 18, 6:34 PM CDT	Severe Thunderstorm Warning	ARX	Jackson, Monroe	56 min
Apr 18, 6:42 PM CDT	Severe Thunderstorm Warning	ARX	Juneau	78 min
Apr 18, 6:45 PM CDT	Severe Thunderstorm Warning	ARX	Crawford	60 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2002 Every severe thunderstorm warning in 2002

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.