Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 21, NWS Green Bay, WI

April 18, 2002Calumet County, Winnebago County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Apr 18, 2002, 8:59 PM CDT for Calumet County, Winnebago County, Wisconsin. It was in force for 46 min. 3 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, 8:59 PM CDT (01:59 UTC)
Expired
Apr 18, 2002, 9:45 PM CDT
In force
46 min
Issued by
NWS Green Bay, WI
Area
Counties, with a storm outline in the text

Counties Calumet County, WI, Winnebago County, WI

The radar

The Green Bay radar (KGRB), 53 km from the middle of the area, began a volume at 02:01 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.

What was reported inside it

TimeReportWhereRemark
Apr 18, 9:10 PM CDTThunderstorm Wind 50 EBrothertown, WI
Apr 18, 9:35 PM CDTHail 0.88Chilton, WI
Apr 18, 9:35 PM CDTThunderstorm Wind 55 EChilton, 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.

IssuedProductOfficeLasted
Apr 18, 8:00 PM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 2.0 hours before the alert went out and 51 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, Green Bay/Straub, WI at 00:00Z on 2002-04-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 188 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, Green Bay/Straub, WI at 00:00Z on 2002-04-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 216 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
188 J/kg
Mixed-layer CIN
-106 J/kg
Mixed-layer LCL
2321 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
216 m²/s²
0-3 km storm-relative helicity
288 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 KGRB 190159
SVRGRB
WIC015-139-190245-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREEN BAY WI
859 PM CDT THU APR 18 2002

THE NATIONAL WEATHER SERVICE IN GREEN BAY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CALUMET COUNTY IN WISCONSIN
  WINNEBAGO COUNTY IN WISCONSIN

* UNTIL 945 PM CDT

* AT 859 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR AND SPOTTER
  REPORTS INDICATED A SEVERE THUNDERSTORM WITH STRONG WINDS AND HAIL.
  THE STORM WAS LOCATED 5 MILES SOUTHEAST OF WINNEBAGO. THAT PLACES
  IT 5 MILES EAST OF OSHKOSH. IT WAS MOVING EAST AT 55 MPH.

* SOME LOCATIONS THAT WILL BE AFFECTED BY THE STORM INCLUDE...
  QUINNEY BY 905 PM CDT.
  CHILTON BY 910 PM CDT.
  HAYTON BY 915 PM CDT.

A WEATHER SPOTTER REPORTED THAT THE STORM HAD PRODUCED NICKEL-SIZED
HAIL.

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE FOR WINDS IN EXCESS OF
60 MPH...HAIL...AND DEADLY LIGHTNING. SEEK SHELTER IMMEDIATELY.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN GREEN BAY.

LAT...LON 4421 8870 4388 8871 4395 8807 4420 8804

KIECKBUSCH

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 18, 7:03 PM CDTFlash Flood WarningGRBFlorence, Forest, Oneida, Vilas117 min
Apr 18, 7:17 PM CDTSevere Thunderstorm WarningGRBFlorence28 min
Apr 18, 7:26 PM CDTSevere Thunderstorm WarningGRBLincoln, Oneida49 min
Apr 18, 7:26 PM CDTTornado WarningGRBMarathon34 min
Apr 18, 7:42 PM CDTSevere Thunderstorm WarningGRBPortage, Shawano63 min
Apr 18, 7:50 PM CDTSevere Thunderstorm WarningGRBLanglade, Menominee55 min
Apr 18, 8:08 PM CDTSevere Thunderstorm WarningGRBOutagamie, Shawano, Waupaca52 min
Apr 18, 8:25 PM CDTSpecial Marine WarningGRB110 min
Apr 18, 8:25 PM CDTSpecial Marine WarningGRB110 min
Apr 18, 8:25 PM CDTSpecial Marine WarningGRB110 min
Apr 18, 8:30 PM CDTFlash Flood WarningGRBMarinette30 min
Apr 18, 9:13 PM CDTSevere Thunderstorm WarningGRBManitowoc32 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.