Showers and thunderstorms moved across the area August 20 as a trough of low  pressure moved into western Iowa.  Some of the storms were severe downing trees and power lines. Torrential downpours also accompanied the storms with rainfall totals of 1 to 2 inches in just an hour or two.  Otherwise, warm and humid conditions prevailed across the region with high temperatures topping out in the middle 80s to lower 90s.

Thunderstorm Wind in STEPHENSON, ILLINOIS
From 20-AUG-10 13:58:00 to 20-AUG-10 13:58:00 (CST-6)
Location: DAMASCUS
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 65 mph blew down a 10 inch diameter tree limb about 7 miles northwest of Freeport, IL around 258 pm CDT August 20.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 20-AUG-10 16:20:00 to 20-AUG-10 16:20:00 (CST-6)
Location: WARSAW
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 65 mph blew down some large tree limbs and power lines in Warsaw, IL around 520 pm CDT August 20.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 20-AUG-10 16:40:00 to 20-AUG-10 16:40:00 (CST-6)
Location: HAMILTON
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 65 mph blew down some large tree limbs and power lines in Hamilton, IL around 540 pm CDT August 20.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 20-AUG-10 16:50:00 to 20-AUG-10 16:50:00 (CST-6)
Location: AUGUSTA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Wind gusts estimated to be 60 mph were observed in Augusta, IL around 550 pm CDT August 20.  Some small tree limbs were blown down.  The observer made the report the morning of August 21.

Thunderstorm Wind in MCDONOUGH, ILLINOIS
From 20-AUG-10 12:15:00 to 20-AUG-10 12:15:00 (CST-6)
Location: MACOMB
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 60 mph blew down some branches in Macomb, IL at 115 pm CDT August 20.

Lightning in WHITESIDE, ILLINOIS
From 20-AUG-10 12:58:00 to 20-AUG-10 12:58:00 (CST-6)
Location: MORRISON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A 12 year old boy was struck by lightning at Southside Elementary School in Morrison, IL just before 2 pm CDT August 20.

Thunderstorm Wind in CARROLL, ILLINOIS
From 20-AUG-10 13:22:00 to 20-AUG-10 13:22:00 (CST-6)
Location: CHADWICK
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 60 mph were observed in Chadwick, IL at 222 pm CDT August 20.

Thunderstorm Wind in STEPHENSON, ILLINOIS
From 20-AUG-10 13:55:00 to 20-AUG-10 13:55:00 (CST-6)
Location: FREEPORT
Magnitude: 56.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Public

Wind gusts estimated to be 65 mph blew a limb down in Freeport, IL around 255 pm CDT August 20.  The limb, which was 6 to 8 inches in diameter, fell onto some power lines which in turn caused a house fire.  This report was relayed by WREX.

Thunderstorm Wind in WHITESIDE, ILLINOIS
From 20-AUG-10 13:10:00 to 20-AUG-10 13:10:00 (CST-6)
Location: UNIONVILLE
Magnitude: 70.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 70 mph were observed in Morrison, IL around 210 pm CDT August 20.  Several trees and branches were blown down in the area as well as a utility pole along Prairie Center Road.  Route 30 was closed for a while due to tree removal operations.  The sources for this report were the spotter's police scanner and a newspaper.

Thunderstorm Wind in WHITESIDE, ILLINOIS
From 20-AUG-10 13:05:00 to 20-AUG-10 13:05:00 (CST-6)
Location: USTICK
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 60 mph were observed about 2 miles west of Ustick, IL or about 6 miles north northwest of Morrison, IL at 205 pm CDT August 20.