Arctic Air Plunges into the Great Lakes, Northeast and Mid-Atlantic

Arctic air dropping through the northern and eastern U.S. and a storm off the east coast will bring periods of snow, very cold wind chills and hazardous traveling conditions from the Upper Great Lakes to the Northeast. Meanwhile in southern California, Santa Ana winds will decrease but hot, dry air will remain over the area with elevated fire weather conditions.
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Hazardous Weather Conditions

Last Update: 907 PM AST Tue Dec 12 2017

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San Juan, PR Local Forecast Office

57NM SSW Mayaguez PR

Marine Zone Forecast


Rest Of Tonight
Southeast winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Isolated showers.
Wednesday
South winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Isolated showers.
Wednesday Night
Southeast winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Isolated showers.
Thursday
East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Isolated showers.
Thursday Night
East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 11 seconds. North swell 4 to 5 feet. Isolated showers.
Friday
East winds 10 to 15 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 10 seconds. North swell 4 to 5 feet. Isolated showers.
Saturday
Northeast winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. North swell around 4 feet. Isolated showers.
Sunday
Northeast winds 15 to 20 knots. Seas 5 to 7 feet with occasional seas up to 9 feet. Dominant period 11 seconds. North swell 4 to 6 feet. Isolated showers.
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ABOUT THIS FORECAST

Last Update: 907 PM AST Tue Dec 12 2017
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