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Tornadoes tore through Cook, Lake and Will counties Saturday evening, damaging houses and overturning vehicles. No fatalities have been reported.
Commonwealth Edison is reporting that 29,000 customers were left without power as of 8 p.m. About 3,000 customers in Chicago and 25,000 in the south suburbs are in the dark, ComEd spokeswoman Judy Rader said.
At 6:04 p.m., a tornado touched the ground near southwestern Monee and moved northeast at 26 miles per hour, according to the National Weather Service.
At 6:53 p.m., a “large” tornado was spotted about two miles north of Chicago Heights near Interstate 80 by the Illinois-Indiana border, the weather service said.
That tornado is possibly responsible for a crash on Interstate 57 that overturned multiple vehicles — including a semi truck — in the outbound lanes near Stuenkel Road by Monee about 6:22 p.m., said Illinois State Police Joliet District Trooper Mark Dorencz. One person was injured.
Interstate 57 is indefinitely closed in both directions from Interstate 80 to the Monee/Manhattan exit while crews repair downed wires, Dorencz said.
The tornado also passed through a beach near a private lake at the South Wilmington Sportsman Club, 24628 County Line Rd. in Wilmington.
“It went through the middle of the beach,” said Lindell Roberts, a member of the club’s board of directors. “We have a lot of trees down and power lines and stuff like that. A lot of big trees were blown down and limbs lost.”
Roberts said nobody was injured and lifeguards evacuated the beach about an hour before the storms arrival. Members of the clubs were sent to various buildings on the ground.
None of the buildings were damaged, Roberts said.
Will County spokesman Pat Barry said the tornado caused minor structural damage to multiple rural homes.
“Fortunately, the path it took was mostly rural farmland areas,” Barry said. “They are still assessing the damages and we should have a better idea of what we have tomorrow [Sunday].”

myfoxchicago.com

Tornado watch in all of central and eastern Minnesota
MINNEAPOLIS (AP) A tornado watch is in effect for all of central and eastern Minnesota - from as far north as International Falls and Bemidji to as far south as Albert Lea and Winona.
The National Weather Service says the watch will be in effect until 9 p.m.
A tornado watch means conditions are favorable for tornadoes and severe thunderstorms.
Thunderstorms passed through the southwestern part of the state earlier this morning. Western Minnesota isn’t under the watch.
(Copyright 2008 by The Associated Press. All Rights Reserved.) APNP 05-25-08 1450CDT|
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While both tropical cyclones and tornadoes are atmospheric vortices, they have little in common. Tornadoes have diameters on the scale of hundreds of meters and are produced from a single convective storm (i.e. a thunderstorm or cumulonimbus cloud). A tropical cyclone, however, has a diameter on the scale of hundreds of kilometers and is comprised of several to dozens of convective storms.
Additionally, while tornadoes require substantial vertical shear of the horizontal winds to provide ideal conditions for tornado genesis, tropical cyclones require very low values of tropospheric vertical shear in order to form and grow. Tornadoes are produced in regions of large temperature gradient, while tropical cyclones are generated in regions of near zero horizontal temperature gradient.
Also, tornadoes are primarily an over-land phenomenon, as solar heating of the land surface usually contributes toward the development of the thunderstorm that spawns the vortex, although over-water tornadoes have occurred. But tropical cyclones are purely an oceanic phenomena. They die out over land due to a loss of a moisture source.
Lastly, tropical cyclones have a lifetime that is measured in days, while tornadoes typically last on the scale of minutes.

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