Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 80, NWS Milwaukee, WI

August 21, 2002Waukesha County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Aug 21, 2002, 7:48 PM CDT for Waukesha County, Wisconsin. It was in force for 27 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: Aug 21, 2002, 7:48 PM CDT (00:48 UTC)
Expired: Aug 21, 2002, 8:15 PM CDT
In force: 27 min
Issued by: NWS Milwaukee, WI
Area: Counties, with a storm outline in the text

County Waukesha County, WI

The radar

The Milwaukee radar (KMKX), 20 km from the middle of the area, began a volume at 00:51 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

Time	Report	Where	Remark
Aug 21, 8:10 PM CDT	Thunderstorm Wind 56 M	Waukesha, 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
Aug 21, 2:25 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 0.8 hours before the alert went out and 160 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: 216 J/kg
Mixed-layer CIN: -110 J/kg
Mixed-layer LCL: 665 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 163 m²/s²
0-3 km storm-relative helicity: 257 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.9

Open this sounding in Storm Lab

The text

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

043 
WUUS53 KMKX 220048
SVRMKE
WIC133-220115-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
748 PM CDT WED AUG 21 2002

THE NATIONAL WEATHER SERVICE IN SULLIVAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WAUKESHA COUNTY IN SOUTHEAST WISCONSIN

* UNTIL 815 PM CDT

* AT 748 PM CDT...THE PUBLIC REPORTED SEVERE THUNDERSTORMS WITH
  DAMAGING WINDS LOCATED 3 MILES NORTHWEST OF WAUKESHA...MOVING
  NORTHEAST AT 50 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  PEWAUKEE BY 750 PM CDT.
  BROOKFIELD BY 755 PM CDT.
  MENOMONEE FALLS BY 800 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

LAT...LON 4317 8850 4288 8846 4287 8810 4317 8810

REM

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 21, 7:16 PM CDT	Severe Thunderstorm Warning	MKX	Dane, Jefferson	59 min
Aug 21, 7:25 PM CDT	Special Marine Warning	MKX		65 min
Aug 21, 7:25 PM CDT	Special Marine Warning	MKX		65 min
Aug 21, 7:29 PM CDT	Severe Thunderstorm Warning	MKX	Walworth	61 min
Aug 21, 8:00 PM CDT	Severe Thunderstorm Warning	MKX	Kenosha, Racine	60 min
Aug 21, 8:01 PM CDT	Severe Thunderstorm Warning	MKX	Washington	14 min
Aug 21, 8:08 PM CDT	Severe Thunderstorm Warning	MKX	Milwaukee, Ozaukee	67 min
Aug 21, 8:16 PM CDT	Special Marine Warning	MKX		89 min
Aug 21, 8:16 PM CDT	Special Marine Warning	MKX		89 min
Aug 21, 8:16 PM CDT	Special Marine Warning	MKX		89 min
Aug 21, 9:37 PM CDT	Severe Thunderstorm Warning	MKX	Green, Rock	53 min
Aug 22, 4:04 AM CDT	Flash Flood Warning	MKX	Lafayette	3 hr

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; radar from the NEXRAD Level II archive.