It's a warning as familiar as a daily prayer for Tornado Alley residents: When a twister approaches, take shelter in a basement or low-level interior room or closet, away from windows and exterior

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It's a warning as familiar as a daily prayer for Tornado Alley residents: When a twister approaches, take shelter in a basement or low-level interior room or closet, away from windows and exterior walls.

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WPVI – Philadelphia
Sat, Jun 1, 2013 11:23 AM EDT