Help The Tropical Cyclone Pam Disaster Relief Effort
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A shower possible
A brief shower or two
Periods of rain
Cloudy with a little rain
of sunlight, then sets at
of moolight, then sets at
Cloudy skies and spotty showers will dampen the holiday weekend across the Seattle area. more >
Dec 20, 2012; 5:00 AM ET
The 540 line is often used by meteorologists to determine the chances of rain vs. snow.