Heavy Snow & Ice Across Portions of the Plains and Midwest; Unsettled in the Pacific Northwest

Heavy snow and freezing rain will impact portions of the Plains, upper Midwest, and Great Lakes into Monday. Significant snow accumulations and gusty winds are likely in some areas. Farther to the south, rain and a few thunderstorms are expected over the Mississippi, Tennessee, and Ohio Valleys. Heavy rain & mountain snowfall will also continue from northern California into the Pacific Northwest.
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Hazardous Weather Conditions

Last Update: 630 PM EST Sat Jan 20 2018

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Philadelphia, PA Local Forecast Office

20NM S New York NY

Marine Zone Forecast


Synopsis: High pressure to our south will slowly shift offshore through Sunday. A low pressure system will propagate from the southern Plains to the Great Lakes region Sunday into Tuesday. As it does so, expect first a warm front to arrive in our area Sunday night or Monday, followed by a cold front on Tuesday. High pressure will then build toward our region through Friday.

Tonight
W winds 10 to 15 kt with gusts up to 20 kt. Seas around 3 ft. Swell mainly from the S with a dominant period of 7 seconds.
Sun
W winds 5 to 10 kt. Seas around 3 ft early in the morning, then 2 ft or less. Swell mainly from the S with a dominant period of 6 seconds.
Sun Night
SW winds 5 to 10 kt. Seas 2 ft or less. Swell mainly from the S with a dominant period of 5 seconds. a chance of rain after midnight.
Mon
S winds 5 to 10 kt with gusts up to 20 kt, increasing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 2 ft or less, then around 3 ft in the afternoon. a chance of rain until late afternoon.
Mon Night
S winds 10 to 15 kt with gusts up to 20 kt, increasing to 15 to 20 kt with gusts up to 30 kt after midnight. Seas 3 to 5 ft. Rain likely after midnight.
Tue
S winds 20 to 25 kt, becoming SW 15 to 20 kt in the afternoon. Gusts up to 30 kt. Seas 5 to 8 ft. Showers, mainly in the morning.
Tue Night
W winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to 6 ft.
Wed
W winds around 20 kt. Seas 3 to 5 ft.
Wed Night
NW winds 15 to 20 kt. Seas 3 to 4 ft.
Thu
NW winds 15 to 20 kt. Seas around 3 ft.
Thu Night
NW winds 10 to 15 kt. Seas around 3 ft in the evening, then 2 ft or less.
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ABOUT THIS FORECAST

Last Update: 630 PM EST Sat Jan 20 2018
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