Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 75, NWS Milwaukee, WI

August 21, 2002Fond du Lac County, Green Lake County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Aug 21, 2002, 6:17 PM CDT for Fond du Lac County, Green Lake County, Wisconsin. It was in force for 43 min. 2 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: Aug 21, 2002, 6:17 PM CDT (23:17 UTC)
Expired: Aug 21, 2002, 7:00 PM CDT
In force: 43 min
Issued by: NWS Milwaukee, WI
Area: Counties, with a storm outline in the text

Counties Fond du Lac County, WI, Green Lake County, WI

The radar

The Milwaukee radar (KMKX), 96 km from the middle of the area, began a volume at 23:17 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, 6:41 PM CDT	Tornado F0	Lamartine, WI	A weak tornado spun up in the rural area north-northwest of Oakfield, just east-southeast of the intersection of Hwy 151 and TC. It moved east-southeast and crossed Hwy Y before dissipating. A few trees were uprooted and some grasses were flattened. Wind spe
Aug 21, 7:08 PM CDT	Thunderstorm Wind 70 E	Oakfield, 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 12:00Z, 11.3 hours before the alert went out and 104 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: 973 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 162 m²/s²
0-3 km storm-relative helicity: 230 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

460 
WUUS53 KMKX 212317
SVRMKE
WIC039-047-220000-

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

THE NATIONAL WEATHER SERVICE IN SULLIVAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN FOND DU LAC COUNTY IN EAST CENTRAL WISCONSIN
  GREEN LAKE COUNTY IN SOUTH CENTRAL WISCONSIN

* UNTIL 700 PM CDT

* AT 616 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 7 MILES WEST OF KINGSTON...OR ABOUT 13 MILES
  NORTHEAST OF PORTAGE...MOVING EAST AT 55 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  MARKESAN AT 625 PM CDT.
  FAIRWATER AT 630 PM CDT.
  BRANDON AT 635 PM CDT.
  ROSENDALE AT 645 PM CDT.

HAIL UP TO 3/4 OF AN INCH IN DIAMETER AND WINDS GREATER THAN 60 MILES
AN HOUR ARE EXPECTED FROM THIS STORM. IF YOU ARE IN THE STORMS
PATH...SEEK SHELTER INDOORS.

THIS STORM IS CAPABLE OF PRODUCING HEAVY RAINFALL...WHICH MAY FLOOD
LOW LYING AREAS SUCH AS DITCHES AND UNDERPASSES. AVOID THESE AREAS
AND DO NOT CROSS FLOODED ROADS AS THEY MAY BE WASHED OUT.

LAT...LON 4374 8923 4366 8922 4363 8841 4393 8861
          4397 8908

HENTZ

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 21, 5:10 PM CDT	Severe Thunderstorm Warning	MKX	Iowa, Lafayette	65 min
Aug 21, 5:16 PM CDT	Severe Thunderstorm Warning	MKX	Fond du Lac, Green Lake	29 min
Aug 21, 5:18 PM CDT	Tornado Warning	MKX	Fond du Lac, Green Lake	57 min
Aug 21, 5:25 PM CDT	Severe Thunderstorm Warning	MKX	Columbia, Sauk	50 min
Aug 21, 5:54 PM CDT	Severe Thunderstorm Warning	MKX	Columbia, Dane, Marquette	51 min
Aug 21, 6:24 PM CDT	Severe Thunderstorm Warning	MKX	Green	51 min
Aug 21, 6:25 PM CDT	Flash Flood Warning	MKX	Fond du Lac	4 hr
Aug 21, 6:42 PM CDT	Severe Thunderstorm Warning	MKX	Rock	48 min
Aug 21, 6:57 PM CDT	Special Marine Warning	MKX		93 min
Aug 21, 6:57 PM CDT	Special Marine Warning	MKX		93 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; radar from the NEXRAD Level II archive.