Help The Tropical Cyclone Pam Disaster Relief Effort
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A strong thunderstorm
Cooler; cloudy, then some sun
Mostly cloudy; breezy, cooler
Sunny, breezy and warmer
Mostly sunny, breezy and warm
of sunlight, then sets at
of moolight, then sets at
A widespread severe weather threat is targeting the central Plains Wednesday evening following spotty severe storms in the South on Tuesday. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.