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.

Last Update: 301 PM AKST Wed Dec 13 2017

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Anchorage, AK Local Forecast Office

14NM W Happy Valley AK

Marine Zone Forecast

Synopsis: A 1004 mb low 360 nm southeast of Middleton Island moves 100 nm east of Middleton Island tonight at 1000 mb and then moves inland Thu morning. A second 996 mb low 350 nm south of Sitkinak weakens to a trough 200 nm east of Sitkinak Thu afternoon before moving inland Thu night. A front enters the western Gulf Thu afternoon and reaches the eastern Gulf Fri afternoon.

S wind 15 kt diminishing to 10 kt after midnight. Seas 5 ft subsiding to 3 ft after midnight.
Variable wind less than 10 kt. Seas 2 ft.
Thu Night
Variable wind less than 10 kt becoming NE 10 kt after midnight. Seas 2 ft.
NE wind 20 kt. Seas 5 ft.
Fri Night
NE wind 15 kt. Seas 5 ft.
N wind 10 kt. Seas 4 ft.
NW wind 20 kt. Seas 4 ft.
N wind 15 kt. Seas 3 ft.
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Last Update: 301 PM AKST Wed Dec 13 2017
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