A disturbance moving across the region caused a warm front to lift northward across northwest Illinois during the late afternoon and evening. Thunderstorms moving eastward from Iowa produced strong gusty winds that resulted in damage to trees in far northwest Illinois. Farther to the south across Mercer and Henry Counties, a thunderstorm produced a series of 4 tornadoes causing damage to crops, trees, and an outbuilding. Heavy rain also fell along and north of Interstate 80 where 2 to 4 inches was reported.

Tornado in HENRY, ILLINOIS
From 12-JUL-14 21:00:00 to 12-JUL-14 21:01:00 (CST-6)
Location: ALPHA
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

This tornado was rated EF-1 with peak winds of 105 mph. Its path length was less than a mile. Several large trees were blown over along both sides of the road with other trees snapped off and some crop damage.

Tornado in MERCER, ILLINOIS
From 12-JUL-14 20:20:00 to 12-JUL-14 20:21:00 (CST-6)
Location: ALEDO MERCER CO ARPT
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

This EF-0 tornado with peak winds of 75 mph produced damage primarily to corn crops.

Thunderstorm Wind in CARROLL, ILLINOIS
From 12-JUL-14 20:00:00 to 12-JUL-14 20:00:00 (CST-6)
Location: LANARK
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter estimated thunderstorm winds gusting to 60 mph.

Tornado in MERCER, ILLINOIS
From 12-JUL-14 20:30:00 to 12-JUL-14 20:40:00 (CST-6)
Location: OLD GILCHRIST
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 10.00K
Reported by: Public

This tornado was rated EF-1 with a peak wind of 105 mph. Along its 3.6 mile path, this tornado crossed the roadway in several locations causing damage to crops, power poles and lines as well as to trees. Some branches were 1 to 3 inches in diameter and some tree trunks snapped off.

Tornado in MERCER, ILLINOIS
From 12-JUL-14 20:46:00 to 12-JUL-14 20:55:00 (CST-6)
Location: GRIFFIN
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

This tornado was rated EF-1 with peak winds of 100 mph. Along its 2.78 mile path length, this tornado produced mainly crop and tree damage with numerous 1 to 3 inch tree limbs down as well as several large tree trunks snapped off. An outbuilding was also destroyed.

Thunderstorm Wind in STEPHENSON, ILLINOIS
From 12-JUL-14 19:48:00 to 12-JUL-14 19:48:00 (CST-6)
Location: LORAN
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency Manager also reported winds sustained at 45 mph.

Thunderstorm Wind in MERCER, ILLINOIS
From 12-JUL-14 20:32:00 to 12-JUL-14 20:32:00 (CST-6)
Location: MATHERVILLE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public that a large tree was uprooted.

Thunderstorm Wind in CARROLL, ILLINOIS
From 12-JUL-14 19:46:00 to 12-JUL-14 19:46:00 (CST-6)
Location: MT CARROLL
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Several trees and power lines were downed by gusty winds. One tree damaged 4 vehicles when it fell, and another tree fell on the roof of theater offices.