UPDATE: 1:56AM: The Severe Thunderstorm Warning for Lake and Cook Counties has been canceled.
UPDATE 1:40AM: Radar indicates that the line of thunderstorms over Cook and Lake counties has weakened considerably, and the warning may be canceled before 2AM.
A Severe Thunderstorm Warning is now in effect until 2AM for northern Cook County, and all of Lake County.
In Cook County, the warning runs along and north of I-90/Kennedy Expressway line.
The main threat will be damaging winds up to 70mph. This is the only warning that is still in effect as of 1:30AM.
Below: Valid Severe T-Storm Warnings as of 1:30AM
A line of severe thunderstorms that is moving through Chicago’s northwest suburbs continues to leave behind a path of damage that appears to be concentrated along the I-90/Northwest Tollway corridoor.
At 1:21AM, a thunderstorm wind gust of 59mph was measured in Huntley.
At 1:15AM, widespread damage reported in Crystal Lake, Illinois. Treees are down, traffic light poles have been blown down, and there is a report one person has been injured. The entire Crystal Lake fire department has been dispatched to handle the damage reports.
At 12:59AM, numerous trees were down in Marengo.
At 12:35AM, numerous trees were down on the east side of Rockford.
A trained spotter reported extensive wind damage in Freeport, Illinois from a Severe Thunderstorm.
Trees and power poles have been snapped off, and siding has been torn off of houses near the Highland Community College in Freeport,
The wind damage occurred at 11:55PM.
A Severe Thunderstorm Warning has been issued for many of Chicago’s northwest and west suburbs in
EASTERN BOONE COUNTY…
NORTHWESTERN COOK COUNTY…
WESTERN LAKE COUNTY…
Heavy rain, frequent lightning, hail up to 1″, and damaging winds to 70mph will be possible in the warned area.
Above: Warnings as of 12:50AM. Graphic courtesy of the Storm Prediction Center.
A Severe Thunderstorm Warning is in effect until 1AM for western DeKalb, Winnebago, Boone, Lee and Ogle Counties. Damaging winds are the main threat from this next round of storms.
75mph winds were reported in East Dubuque, Illinois at 11:18PM.
54mph winds were reported in Stockton, Illinois at 11:36PM. At least part of Stockton has lost power.
Above: Severe Thunderstorm Warnings as of 12:30AM. Counties under T-Storm Warnings are shaded in blue. Graphic courtesy of the Storm Prediction Center.
At Midnight, the weather across the immediate Chicago area is fairly quiet. There are no warnings in effect. However, a Severe Thunderstorm Watch continues for the entire region until 6AM Tuesday morning.
Radar indicates showers and thunderstorms continue over portions of Lake and McHenry County. This activity is well below severe limits.
Further to the west, a much stronger complex of thunderstorms is moving through southern Wisconsin and northwest Illinois. These storms have a history of producing damaging winds, and are being monitored closely. If these storms maintain thier current speed and intensity, they should reach Rockford by 12:45AM, Woodstock by 1:15AM and Waukegan/Chicago by 2:15AM.
Not only is the Chicago area under a Severe Thunderstorm Watch until 6AM CDT, but also an almost uninterrupted area from eastern Nebraska and the extreme northwest corner of Missouri through southern Iowa, northern Illinois across northern Indiana, southern lower Michigan and extreme northwestern Ohio to the western edge of Lake Erie. The western portion of the watch area is in effect until 5AM CDT with the eastern portion in effect until 6AM CDT.
These areas under a Severe Thunderstorm Watch lie along and just to north of a warm front that extends east out of a low pressure center in northeastern Colorado all the way into northern Ohio. In Illinois It is situated almost parallel to and just north of Interstate 80. As the low moves east, the front is forecast to remain almost stationary and then as the low center approaches southeastern Nebraska, the warm front is forecast to move north. It should lift across the Chicago area Tuesday morning.
Showers and thunderstorms will almost continually form and move east along the north side of the warm front during the early morning hours and then lift north with the front Tuesday forenoon.
At 11:25PM, another complex of severe thunderstorms is raking across northwest Illinois, and will take aim on the Chicago area between 12:15AM and 2:00AM.
The storms over northwest Illinois and eastern Iowa have produced a considerable amount of wind damage between 10:45PM and 11:30PM tonight.
At 11:08PM, 60mph winds were reported in Galena.
At 11:05PM, trees were “snapped in half” in Dubuque
At 10:52PM, a semi was blow off the road near Dubuque, Iowa.
At this time, it appears the greatest impact from this next line of storms will again be over the northern half of the Chicago area.
A new severe thunderstorm watch is being issued by the Storm Prediction Center in Norman, Oklahoma for much of extreme northern Illinois including the Chicago area. It will be in effect until 6a.m. Tuesday morning. the area of the watch extends from eastern iowa into northern Indiana and covers an area from I-80 north into extreme southern Wisconsin.