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Significant severe weather outbreak possible June 18-19, 2009

June 16, 2009

A significant severe weather outbreak is possible Thursday and again on Friday, June 18, 2009. As the Carol Stream area has not been significantly affected by severe weather (except for an overnight June storm that brought 70 mph winds to Wheaton), this would be the first outbreak this year.

Severe weather would be possible Thursday afternoon and evening as dewpoints increase substantially and a cold front begins its approach from the west. Increased forcing and vertical shear could lead to organize severe weather.

In addition, the next four days are expected to bring 2 to 4 inches of rain to the area. This amount will vary with the exact track and placement of thunderstorms, and some or all of that amount may fall in a short period of time.

The warm, moist, and unstable air mass would remain through Friday as a strong cold front moves in from the west. The cold front is expected to trigger significant severe weather. For more details and updates, see the following links:

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