20 tornadoes, including an EF-2, now confirmed during Monday’s storms

National Weather Service survey teams have confirmed 15 more tornadoes touched down during Monday night’s derecho.

That brings the total number of confirmed tornadoes to 20. And meteorologists have categorized one as an EF-2, with winds in excess of 110 mph causing “significant damage.”

The teams are also continuing to investigate dozens of other sites where potential twisters touched down during the storm, and meteorologists at the Romeoville office expect the number of confirmed tornadoes to rise throughout the week.

ComEd officials are reporting more than 40,000 customers remain without power, according to the company’s website.

One person was killed in Northwest Indiana when a tree branch broke loose and crashed onto a house, collapsing the roof on a woman in bed, authorities said.

According to weather service reports, the first confirmed tornado in our region touched down around 7:40 p.m. in southern Winnebago County and was categorized as an EF-0, the least damaging type.

Another EF-0 tornado struck near Byron in Ogle County at 7:44 p.m. Peak winds reached 80 mph, and the path of the tornado was 5 miles long, reaching a maximum width of 200 yards. The tornado caused tree damage in some areas and blew roofing materials off a car wash.

Another EF-0 tornado touched down near Ogle County’s Davis Junction at 7:58 p.m. and ran less than two miles straight east with peak wind speeds of 80 mph and a maximum width of 200 yards. Damage was limited to trees, survey teams reported.

At 8:52 p.m., another EF-0 tornado dropped near Sugar Grove and spent 10 minutes on the ground for nearly eight miles until it reached North Aurora. This tornado reached peak wind speeds of 85 mph and was 250 yards at its widest.

The first EF-1 tornado confirmed touched down at 8:55 p.m. near Yorkville and then kept going for 20 minutes until it reached southern Naperville nearly 17 miles later. Peak winds speeds reached 100 mph and the twister also had a maximum width at times of 200 yards. Survey teams said trees along the tornado’s path were uprooted or snapped and there was some reported property damage as well.

An EF-0 tornado was reported at 8:58 p.m. in South Grove Township in DeKalb County. The path was a little more than three miles long and 100 yards wide at its peak. Wind speeds topped out at 75 mph. Crop damage was reported as well as the destruction of an “outbuilding.”

Another EF-1 tornado touched down near Minooka in Will County at 9:07 p.m. and traveled more than 16 miles northeast to Joliet before dissipating at the Des Plaines River. Top wind speeds reached 110 mph, cutting a path 250 yards wide at points.

The storm’s first confirmed EF-2 tornado touched down at 9:17 p.m. near Channahon. This twister snapped power lines over Interstate 55, which was closed in both directions as crews work to rebuild the electrical infrastructure there. The tornado ran at least 25 miles to Matteson in Will County with peak wind speeds in excess of 110 mph and a maximum width at times of 200 yards.

An EF-0 tornado was confirmed in Crest Hill at 9:21 p.m. and lasted nine minutes as it sped 6 miles east to Lockport. At its peak, the twister was 200 yards wide with wind speeds topping out at 75 mph.

Another EF-0 tornado was reported near Elburn at 9:33 p.m. It was on the ground for three minutes and traveled less than two miles reaching a maximum wind speed of 80 mph and was 100 yards wide at its worst. Damage to trees and corn crops was reported.

At 9:37 p.m., another EF-1 tornado touched down near Justice in southern Cook County with winds of up to 90 mph. The tornado was 75 yards wide and lasted a little over two miles.

An EF-1 tornado touched down in Flossmoor at 9:43 p.m. and traveled more than five miles to Thornton, causing structural damage in Thornton and tree damage elsewhere. Peak wind speeds were measured at 100 mph and covered 250 yards in width at its worst.

The shortest tornado confirmed so far was an EF-0 in St. Charles that ran along Roosevelt Road from the Kane County Juvenile Justice Center southeast to the Tri-City Shopping Center, a span of less than a mile starting at 9:44 p.m. Wind speeds peaked at 80 mph, but it was 200 yards across at times. Roof damage was reported along with snapped trees and a utility pole knocked down.

Chicago’s Near West Side and West Loop area was hit with a tornado that reached 600 yards wide at times at 9:47 p.m. The EF-1 twister with peak wind speeds of 95 mph uprooted trees and caused minor structural damage along its 3-mile path, survey teams reported.

Another EF-1 tornado touched down in the Chicago Lawn neighborhood of Chicago at 9:47 p.m. and ran northeast for six minutes into West Englewood three miles away. The tornado’s speeds topped out at 95 mph and had a maximum width of 175 yards.

An EF-0 struck Chicago’s West Town neighborhood at 9:50 p.m. with peak wind speeds reaching 85 mph and a maximum width of 150 yards. It last two minutes and covered a mile and half. Windows were reportedly blown out of buildings, siding and roofing damage was also reported.

An EF-1 tornado in Northwest Indiana that stretched between Cedar Lake and Crown Point spent five minutes on ground going northeast for less than five miles. At its peak, wind speeds were 90 mph and it stretched 300 yards wide, survey teams reported. It touched down at 9:56 p.m.

At 10:23 p.m., an EF-0 tornado was reported from La Grange to Cicero. At times, it was 300 yards wide and reached peak wind speeds of 75 mph. It tracked 7.5 miles and damage was mainly confined to trees.

Midway Airport had an EF-0 tornado tear straight across the runways at 10:31 p.m., survey teams are reporting. It was on the ground for 12 minutes and traveled nearly 10 miles until it dissipated over Lake Michigan at 43rd Street. It was 300 yards wide at times and top speeds of 85 mph caused a 737 airplane to slam into a jet bridge at the airport.

Another EF-0 tornado touched down in Chicago’s Englewood neighborhood at 10:40 p.m. and rolled nearly four miles to the lake front’s Jackson Park in a span of four minutes. Wind speeds peaked at 80 mph and at times covered a 200-yard swath of land. It damaged trees, overturned a train car and caused minor roof damage.

The derecho, a weather term for a straight-swath storm system covering hundreds of miles with a long life and a fast-moving line of showers and thunderstorms, started earlier in the day in Iowa and then fed off the cooler evening air as it carried east, meteorologists said.