Tornado watch issued for Delaware Valley
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A sprawling line of severe thunderstorms that slammed the Heartland Sunday is charging east Monday, placing parts of the Mid-Atlantic and the Southeast under a rare Level 4 out of 5 risk of severe
The Enhanced Fujita or EF Scale is the system meteorologists use to estimate tornado strength by examining the damage it leaves behind. In 2007, the enhanced scale scale replaced the original Fujita Scale developed by Dr.