Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 121, NWS La Crosse, WI

September 30, 2002Trempealeau County, Wisconsin

NWS La Crosse, WI issued this severe thunderstorm warning at Sep 30, 2002, 5:58 PM CDT for Trempealeau County, Wisconsin. It was in force for 32 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: Sep 30, 2002, 5:58 PM CDT (22:58 UTC)
Expired: Sep 30, 2002, 6:30 PM CDT
In force: 32 min
Issued by: NWS La Crosse, WI
Area: Counties, with a storm outline in the text

County Trempealeau County, WI

What was reported inside it

Time	Report	Where	Remark
Sep 30, 6:10 PM CDT	Hail 0.75	Ettrick, 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
Sep 30, 3:05 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.0 hours before the alert went out and 199 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: 784 J/kg
Mixed-layer CIN: -273 J/kg
Mixed-layer LCL: 1360 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 260 m²/s²
0-3 km storm-relative helicity: 210 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.

956 
WUUS53 KARX 302258
SVRLSE
WIC121-302330-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
557 PM CDT MON SEP 30 2002

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  TREMPEALEAU COUNTY IN WEST CENTRAL WISCONSIN

* UNTIL 630 PM CDT

* AT 557 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 4 MILES WEST OF GALESVILLE...OR ABOUT 11 MILES
  EAST OF WINONA...MOVING NORTHEAST AT 45 MPH.

* THE SEVERE THUNDERSTORM IS EXPECTED TO BE...
  OVER ETTRICK AT 610 PM CDT

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM CDT MONDAY EVENING FOR
SOUTHEAST MINNESOTA AND NORTHWESTERN WISCONSIN.

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND GUSTS IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR
YOUR PROTECTION...MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF
YOUR HOME OR BUSINESS.

LAT...LON 4432 9117 4410 9115 4407 9125 4407 9131
          4403 9136 4401 9142 4416 9153

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 29, 9:43 PM CDT	Severe Thunderstorm Warning	ARX	Buffalo	32 min
Sep 29, 11:17 PM CDT	Severe Thunderstorm Warning	ARX	Clark, Jackson	58 min
Sep 30, 5:18 PM CDT	Severe Thunderstorm Warning	ARX	Buffalo	27 min
Sep 30, 5:22 PM CDT	Severe Thunderstorm Warning	ARX	Taylor	38 min
Sep 30, 5:53 PM CDT	Severe Thunderstorm Warning	ARX	Taylor	37 min
Sep 30, 6:04 PM CDT	Severe Thunderstorm Warning	ARX	Jackson	26 min
Sep 30, 6:28 PM CDT	Severe Thunderstorm Warning	ARX	Jackson	62 min
Sep 30, 6:30 PM CDT	Severe Thunderstorm Warning	ARX	Taylor	45 min
Sep 30, 6:45 PM CDT	Tornado Warning	ARX	Taylor	30 min
Sep 30, 6:53 PM CDT	Severe Thunderstorm Warning	ARX	Clark	52 min
Sep 30, 6:53 PM CDT	Severe Thunderstorm Warning	ARX	Clark
Sep 30, 6:57 PM CDT	Tornado Warning	ARX	Clark	48 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.