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September 30, 2007

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Eleven degrees above normal this week

In yet another demonstration of the truism that the weather does not read the calendar, Chicagoans will enjoy another week of summer temperatures in the autumn. The average of daily high and low temperatures from today through Oct. 7 is expected to be 68 degrees, and that is 11 degrees above the climatological normal for that period. The city's daily highs are forecast to reach or exceed 80 degrees on four of the next six days -- a significant contrast to the long-term historical expectation that only one day in eight climbs to that level in early October. Thunderstorms, too, will be rumbling across the city area this week with a frequency more typical of July than October. A parade of disturbances sweeping across the Upper Midwest (similar to the system that spawned Sunday night's storms) will trigger storms about every three days -- late Tuesday into Wednesday and again late Saturday.
--By Richard Koeneman, WGN Weather Center Meteorologist

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Green Skies and Thunderstorms

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