Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 53, NWS Twin Cities, MN

April 18, 2002Eau Claire County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Apr 18, 2002, 4:57 PM CDT for Eau Claire County, Wisconsin. It was in force for 63 min. 4 reports 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, 2002, 4:57 PM CDT (21:57 UTC)
Expired: Apr 18, 2002, 6:00 PM CDT
In force: 63 min
Issued by: NWS Twin Cities, MN
Area: Counties, with a storm outline in the text

County Eau Claire County, WI

What was reported inside it

Time	Report	Where
Apr 18, 5:35 PM CDT	Hail 2.5	Eau Claire, WI
Apr 18, 5:40 PM CDT	Hail 2	Fall Creek, WI
Apr 18, 5:50 PM CDT	Hail 1.25	Ludington, WI
Apr 18, 6:10 PM CDT	Hail 0.75	Foster, 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

Minneapolis, MN (KMPX), launched 12:00Z, 10.0 hours before the alert went out and 176 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: 1064 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 745 m²/s²
0-3 km storm-relative helicity: 912 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.

000 
WUUS53 KMPX 182157
SVRMSP
WIC035-182300-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
455 PM CDT THU APR 18 2002

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAU CLAIRE COUNTY IN WEST CENTRAL WISCONSIN

* UNTIL 600 PM CDT

* AT 455 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM WITH LARGE   
  HAIL 4 MILES SOUTH OF EAU CLAIRE...MOVING EAST NORTHEAST AT 35 MPH.

* SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE...
  ALTOONA.
  EAU CLAIRE.
  FALL CREEK.

* AT 452 PM...A SPOTTER 7 MILES SOUTHWEST OF THE CITY OF EAU CLAIRE
  REPORTED  HAIL 1 INCH IN DIAMETER. 

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

&
LAT...LON 4484 9164 4463 9157 4463 9101 4484 9098

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 18, 3:52 AM CDT	Severe Thunderstorm Warning	MPX	Pierce, Saint Croix	53 min
Apr 18, 4:49 AM CDT	Severe Thunderstorm Warning	MPX	Barron, Dunn	41 min
Apr 18, 5:24 AM CDT	Tornado Warning	MPX	Dunn	21 min
Apr 18, 5:36 AM CDT	Severe Thunderstorm Warning	MPX	Barron	24 min
Apr 18, 5:42 AM CDT	Severe Thunderstorm Warning	MPX	Chippewa	33 min
Apr 18, 4:12 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa	63 min
Apr 18, 4:20 PM CDT	Severe Thunderstorm Warning	MPX	Eau Claire, Pepin	40 min
Apr 18, 4:28 PM CDT	Severe Thunderstorm Warning	MPX	Dunn	32 min
Apr 18, 5:34 PM CDT	Severe Thunderstorm Warning	MPX	Rusk	26 min
Apr 18, 5:57 PM CDT	Severe Thunderstorm Warning	MPX	Eau Claire	63 min
Apr 18, 6:59 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa	31 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.