Several clusters of thunderstorms moved east-southeast through south-central and southeast Wisconsin on May 30, 2003, resulting in scattered reports of tornadoes and damaging, straight-line downburst winds that toppled large trees and power-lines.  One thunderstorm cell attained supercell status, and after moving east out of Iowa County, turned right and moved east-southeast through the area south of Madison.  A very weak tornado was noted southwest of Verona, but thereafter, only rotating wall cloud reports were received.  Another tornado spun up in the rural area southwest of Brodhead (Green Co.), and proceeded to move east-southeast into extreme southwest Rock County.  The parent thunderstorm for this tornado eventually moved east across the city of Beloit and dumped 1.50 inches of heavy rain, resulting in urban flooding (water up to the floor board at one location) that led to a couple vehicle accidents.  Detailed information about the Dane County and Green-Rock County tornado can be found in the individual tornado reports.

Funnel Cloud in GREEN LAKE, WISCONSIN
From 30-MAY-03 13:20:00 to 30-MAY-03 13:20:00 (CST)
Location: PRINCETON
Reported by: TRAINED SPOTTER

Tornado in ROCK, WISCONSIN
From 30-MAY-03 17:04:00 to 30-MAY-03 17:12:00 (CST)
Location: AVON
Tornado F-scale: F1
Reported by: LAW ENFORCEMENT

This tornado, which spun up in southeast Green County, tracked east-southeast into extreme southwest Rock County at a point 2.3 miles southwest of Avon, where Douglas Road intersects County Trunk T.  In Rock County, this tornado blew over a small grain bin, blew a gravity bin off its foundation, flipped and twisted a large field sprinkler system, lightly damaged a home's siding and roof, and ripped up some yard fencing.  It is estimated that maximum wind were about 78 to 86 knots (90 to 100 mph).  It dissipated in the wooded bottom lands of the Sugar River southeast of Avon, about three-fourths of a mile north of the Illinois state border.

Thunderstorm Wind in FOND DU LAC, WISCONSIN
From 30-MAY-03 17:20:00 to 30-MAY-03 18:20:00 (CST)
Location: ELDORADO
Magnitude: 50 EG
Reported by: LAW ENFORCEMENT

Tornado in GREEN, WISCONSIN
From 30-MAY-03 16:52:00 to 30-MAY-03 17:04:00 (CST)
Location: OAKLEY
Tornado F-scale: F1
Reported by: LAW ENFORCEMENT

A supercell spawned a rain-wrapped tornado that tracked southeast through a rural portion of Green County about 6 miles southwest and south of Brodhead.  One home sustained minor damage to its siding and shutters, and minor damage was noted to a storage shed; otherwise, only tree damage was reported.  It is estimated that winds speeds with this tornado were about 70 knots (80 mph).  This tornado continued east-southeast out of Green County at a location 6.0 miles east of Oakley (where County Trunk T doglegs west in Green County) and into the southwest corner of Rock County.

Thunderstorm Wind in DANE, WISCONSIN
From 30-MAY-03 16:05:00 to 30-MAY-03 16:05:00 (CST)
Location: MT HOREB
Magnitude: 56 EG
Reported by: LAW ENFORCEMENT

Tornado in DANE, WISCONSIN
From 30-MAY-03 16:25:00 to 30-MAY-03 16:30:00 (CST)
Location: MT VERNON
Tornado F-scale: F0
Reported by: TRAINED SPOTTER

A very weak tornado spun up north of Mt. Vernon and moved east to the rural area southwest of Verona.  Only minor vegetation damage was noted, leading to an estimated wind speed of about 43 knots (50 mph).  It was video taped by a mobile severe weather spotter.

Heavy Rain in ROCK, WISCONSIN
From 30-MAY-03 17:00:00 to 30-MAY-03 19:00:00 (CST)
Location: BELOIT
Reported by: NEWSPAPER