A wake low developed behind a line of thunderstorms that traveled across Iowa and eventually weakened over northern Illinois.  This wake low tracked along the Illinois/Wisconsin border through mid to late morning on May 30th and produced sustained winds of 45 to 55 mph for up to a half hour at some locations with gusts reported to 65 mph.  These strong winds caused tree damage and power outages, mainly across far northern Illinois. Winds gusted between 45 and 55 mph at Rockford Airport for 15 minutes with a peak gust to 63 mph.  A roof was blown off a building at Rockford Airport.  A large tree was blown down across Woodland Drive and small tree limbs were blown down near Interstate 90 and Business US-20. In McHenry County, a wind gust to 64 mph was measured in Island Lake.  In Woodstock, a tree was blown down on a house near Birch and Julie Streets, a four foot diameter tree was blown along with powerlines and a lightpole was blown down near Route 47 and Route 120.  In Marengo, a large tree was blown near Forest Street and Highway 23 and a semi truck was overturned near Route 20 and Interstate 90.  A large tree was blown down onto a house along with numerous trees blown down between Garden Prairie Road and Illinois 23, six miles north of Marengo.  A 60 foot tall, steel wind mill was blown down in Union.  Tree limbs and powerlines were blown down near McHenry. In Lake County, a wind gust to 61 mph was measured in Gurnee.  In Libertyville, a tree was blown down on Ellis Avenue at Winchester Road and a 30 foot tree was blown down onto powerlines near Route 137 and the Des Plaines River.  In Waukegan, trees and large branches were blown down near Lewis Avenue.  Tree limbs and power lines were blown down across many areas of central Lake County.

High Wind in MCHENRY, ILLINOIS
From 30-MAY-08 09:45:00 to 30-MAY-08 10:35:00 (CST-6)
Magnitude: 56.00 MG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Mesonet

A wind gust to 64 mph was measured in Island Lake.  In Woodstock, a tree was blown down on a house near Birch and Julie Streets, a four foot diameter tree was blown along with powerlines and a lightpole was blown down near Route 47 and Route 120.  In Marengo, a large tree was blown near Forest Street and Highway 23 and a semi truck was overturned near Route 20 and Interstate 90.  A large tree was blown down onto a house along with numerous trees blown down between Garden Prairie Road and Illinois 23, six miles north of Marengo.  Tree limbs and powerlines were blown down near McHenry.

High Wind in WINNEBAGO, ILLINOIS
From 30-MAY-08 09:15:00 to 30-MAY-08 10:00:00 (CST-6)
Magnitude: 55.00 MG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: ASOS

Winds gusted between 45 and 55 mph at Rockford Airport for 15 minutes with a peak gust to 63 mph.  A roof was blown off a building at Rockford Airport.  A large tree was blown down across Woodland Drive and small tree limbs were blown down near Interstate 90 and Business US-20.

High Wind in LAKE, ILLINOIS
From 30-MAY-08 10:00:00 to 30-MAY-08 11:00:00 (CST-6)
Magnitude: 53.00 MG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Mesonet

A wind gust to 61 mph was measured in Gurnee.  In Libertyville, a tree was blown down on Ellis Avenue at Winchester Road and a 30 foot tree was blown down onto powerlines near Route 137 and the Des Plaines River.  In Waukegan, trees and large branches were blown down near Lewis Avenue.  Tree limbs and power lines were blown down across many areas of central Lake County.