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PHOTOS: Cecily's Winter Weather Outlook images

Friday, November 14, 2014
North America had the highest snow cover on record during September. By the end of October, Siberia had its second highest snow cover on record.
Sea temperatures over the next 3 months are forecast to be above normal in the eastern Gulf of Alaska and above normal in the central Pacific - meaning a weak El Nino winter.
This combination typically creates a big ridge in the west.
But what goes up must come down, resulting in a trough here in the east, resulting in a trough here in the east.
This big dip in the jet stream will open the door for a cross polar flow that allows arctic air to stream from Siberia across the North Pole and south into our region.
If northern branch of the jet stream links with moisture from southern jet, nor’easters develop. Add an increased threat of blocking and these storms can be slow-moving.
expect to see several nor'easters, with mixed precipitation, that means an increased threat of icing, and more visits from the Polar Vortex.
In terms of snowfall, I’m predicting around 150% of normal in Philadelphia & along the I-95 corridor giving us 30 to 36 inches.
In the Lehigh Valley, 160% of normal, 36 to 42 inches.
And at the shore, with mixing cutting down on snowfall, 140% of normal, 18 to 24 inches.
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North America had the highest snow cover on record during September. By the end of October, Siberia had its second highest snow cover on record.

See Cecily Tynan's Winter Weather Outlook in pictures.

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