Event summary for 4/19/00 and 4/20/00.  See individual storm reports for additional details.  Isolated thunderstorms developed along a warm front and produced penny-sized hail in portions of northwest Illinois during the morning of April 19th.  The frontal boundary remained draped across Iowa and Illinois, and afternoon heating combined with moisture transport south of the boundary helped to de-stabilize the atmosphere, setting the stage for another round of severe weather beginning the evening of the 19th.  Large hail and damaging wind were the primary threats.  Hail up to golfball-sized fell over portions of northeast Iowa and northeast Missouri during the evening hours.  Severe weather continued into the early morning hours of the 20th.  The areas hardest hit included portions of southeast Iowa, and west central and northwest Illinois.  A possible gustnado produced a swath of damage in the village of Smithshire in Warren County Illinois.  The highest recorded wind speed was a 63 mph gust in McDonough County Illinois.  Numerous homes and buildings suffered roof damage, and thunderstorm winds downed numerous trees and power lines.  Moderate to locally heavy rain continued through much of the day on the 20th, which caused urban and small stream flooding.

Thunderstorm Wind in HENRY, ILLINOIS
From 20-APR-00 02:05:00 to 20-APR-00 02:05:00 (CST)
Location: KEWANEE
Property damage: 10K
Reported by: LAW ENFORCEMENT

Thunderstorm winds downed trees and large limbs, and caused extensive roof damage to one home.  Vehicles were also damaged and an empty semi-trailer was blown over.

Thunderstorm Wind in HENDERSON, ILLINOIS
From 20-APR-00 00:00:00 to 20-APR-00 00:00:00 (CST)
Location: BIGGSVILLE
Property damage: 1K
Reported by: NEWSPAPER

Thunderstorm winds downed several trees along Illinois Route 94 between Biggsville and Rozetta.

Hail in WARREN, ILLINOIS
From 20-APR-00 00:28:00 to 20-APR-00 00:28:00 (CST)
Location: MONMOUTH
Magnitude: 0.75 
Reported by: LAW ENFORCEMENT

Penny-sized hail reported by law enforcement official.

Thunderstorm Wind in WARREN, ILLINOIS
From 20-APR-00 04:05:00 to 20-APR-00 04:05:00 (CST)
Location: MONMOUTH
Property damage: .5K
Reported by: LAW ENFORCEMENT

Thunderstorm winds blew down a large tree, which blocked U.S. Highway 67.

Thunderstorm Wind in WARREN, ILLINOIS
From 20-APR-00 04:00:00 to 20-APR-00 04:00:00 (CST)
Location: MONMOUTH
Property damage: 5K
Reported by: EMERGENCY MANAGER

Thunderstorm winds blew down a chimney at a residence and several trees.  The roof of a machine shed, grain bins, and a barn were also damaged.

Thunderstorm Wind in WARREN, ILLINOIS
From 20-APR-00 03:30:00 to 20-APR-00 03:40:00 (CST)
Location: SMITHSHIRE
Property damage: 20K
Reported by: NEWSPAPER

A possible gustnado produced a damage path around 50 yards wide and a quarter mile long.  Wind tore most of the roof off the township garage.  5 grain bins, 2 homes , and several trees and fences were damaged.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 20-APR-00 03:20:00 to 20-APR-00 03:40:00 (CST)
Location: LA HARPE
Property damage: 15K
Reported by: NEWSPAPER

Thunderstorm winds downed large trees, power lines, and an advertising sign, and destroyed a barn.  Numerous roofs in the community were damaged.  Winds also blew a garage across a yard.

Thunderstorm Wind in MCDONOUGH, ILLINOIS
From 20-APR-00 03:43:00 to 20-APR-00 03:43:00 (CST)
Location: BLANDINSVILLE
Magnitude: 54 M
Reported by: TRAINED SPOTTER

63 mph thunderstorm wind gust reported by storm spotter.

Thunderstorm Wind in WARREN, ILLINOIS
From 20-APR-00 03:58:00 to 20-APR-00 03:58:00 (CST)
Location: ROSEVILLE
Property damage: .5K
Reported by: NEWSPAPER

Thunderstorm winds snapped a large tree limb on a power line, which caused a power outage in the community.