WGN-TV Chief Meteorologist Tom Skilling and the WGN Weather Center staff provide daily coverage of weather in the Chicago area.

Meteorological summer to end on cooler note

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With just a week left in meteorological summer, Chicago along with much of the
Midwest is locked in a comfortable autumnal-like air mass.
Record lows toppled Sunday morning when the mercury dipped to 39 degrees at Grand
Forks, N.D., and 50 degrees at Marshalltown, Iowa. Frost and freeze conditions are
expected Monday morning in portions of the Upper Midwest.
In Chicago, Sunday's high at Midway Airport reached only 78 degrees, a drop of 12
degrees after Saturday's rare 90 -- only the eighth of the year. Officially the city has
logged only three 90s at O'Hare Airport with none since mid-July. Rockford has failed
to record a single 90 so far in 2008, something that has never happened there since
records began in 1893.
Temperatures here will creep back into the 80s later this week as warmer and more
humid conditions stage a brief return.

TWISTERS SIGHTED SOUTHEAST
OF DENVER AND IN ALABAMA

Severe thunderstorms erupted along the foothills of the Rockies southeast of Denver
Sunday evening. A large, long-lived twister was sighted near Parker.
In central Alabama, Fay's remnants spawned two twisters: one near Emerald Mountain
and the other near Welona.
--By Steve Kahn, WGN Weather Center Meteorologist