Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 8, NWS Milwaukee, WI

April 18, 2002Jefferson County, Rock County, Walworth County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Apr 18, 2002, 5:30 PM CDT for Jefferson County, Rock County, Walworth County, Wisconsin. It was in force for 60 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Apr 18, 2002, 5:30 PM CDT (22:30 UTC)
Expired
Apr 18, 2002, 6:30 PM CDT
In force
60 min
Issued by
NWS Milwaukee, WI
Area
Whole counties

Counties Jefferson County, WI, Rock County, WI, Walworth County, WI

The radar

The Milwaukee radar (KMKX), 28 km from the middle of the area, began a volume at 22:33 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 18, 2:30 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.5 hours before the alert went out and 191 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-pSkew-T log-p diagram, Davenport, at 12:00Z on 2002-04-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1362 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 12:00Z on 2002-04-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 126 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1362 J/kg
Mixed-layer CIN
-188 J/kg
Mixed-layer LCL
1306 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
126 m²/s²
0-3 km storm-relative helicity
119 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 KMKX 182230
SVRMKE
WIC055-105-127-182330-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
528 PM CDT THU APR 18 2002

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ROCK COUNTY IN SOUTH CENTRAL WISCONSIN
  JEFFERSON COUNTY IN SOUTHEAST WISCONSIN
  WALWORTH COUNTY IN SOUTHEAST WISCONSIN

* UNTIL 630 PM CDT

* AT 528 PM CDT...DOPPLER RADAR INDICATED SEVERE THUNDERSTORMS WITH  
  LARGE HAIL AND DAMAGING WINDS LOCATED 10 MILES SOUTHWEST OF 
  WHITEWATER...OR 7 MILES SOUTHEAST OF MILTON...MOVING NORTHEAST AT 60 
  MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  WHITEWATER BY 530 PM CDT.
  PALMYRA BY 540 PM CDT.

IF YOU ARE IN THE PATH OF THIS LINE OF STORMS...YOU SHOULD PREPARE
FOR DAMAGING WINDS IN EXCESS OF 60 MPH...LARGE HAIL...AND DEADLY
LIGHTNING. SEEK SHELTER IMMEDIATELY

HENTZ

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 18, 7:17 AM CDTSevere Thunderstorm WarningMKXFond du Lac, Sheboygan58 min
Apr 18, 7:25 AM CDTSpecial Marine WarningMKX65 min
Apr 18, 7:25 AM CDTSpecial Marine WarningMKX65 min
Apr 18, 2:48 PM CDTSevere Thunderstorm WarningMKXIowa, Lafayette, Sauk57 min
Apr 18, 3:07 PM CDTTornado WarningMKXLafayette23 min
Apr 18, 3:21 PM CDTSpecial Marine WarningMKX24 min
Apr 18, 3:21 PM CDTSpecial Marine WarningMKX24 min
Apr 18, 3:29 PM CDTTornado WarningMKXLafayette31 min
Apr 18, 3:31 PM CDTTornado WarningMKXLafayette29 min
Apr 18, 3:44 PM CDTSevere Thunderstorm WarningMKXColumbia, Dane, Iowa, Sauk61 min
Apr 18, 3:57 PM CDTTornado WarningMKXGreen, Lafayette33 min
Apr 18, 4:03 PM CDTTornado WarningMKXColumbia, Sauk27 min
Apr 18, 4:31 PM CDTTornado WarningMKXColumbia, Sauk29 min
Apr 18, 4:45 PM CDTSevere Thunderstorm WarningMKXGreen, Rock60 min
Apr 18, 4:56 PM CDTTornado WarningMKXRock49 min
Apr 18, 4:59 PM CDTSevere Thunderstorm WarningMKXMarquette31 min
Apr 18, 5:32 PM CDTSevere Thunderstorm WarningMKXDane43 min
Apr 18, 5:34 PM CDTSpecial Marine WarningMKX56 min
Apr 18, 5:34 PM CDTSpecial Marine WarningMKX56 min
Apr 18, 5:34 PM CDTSpecial Marine WarningMKX56 min
Apr 18, 6:10 PM CDTSevere Thunderstorm WarningMKXDane, Jefferson35 min
Apr 18, 6:33 PM CDTSpecial Marine WarningMKX57 min
Apr 18, 6:33 PM CDTSpecial Marine WarningMKX57 min
Apr 18, 6:33 PM CDTSpecial Marine WarningMKX57 min
Apr 18, 6:33 PM CDTSpecial Marine WarningMKX57 min
Apr 18, 6:33 PM CDTSpecial Marine WarningMKX57 min
Apr 18, 6:33 PM CDTSpecial Marine WarningMKX57 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2002Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.