Heavy Rain and Flooding, and Significant Wintry Impacts for the Central U.S.

A strong frontal boundary slowing as it moves into the central U.S. will tap into deep moisture to produce heavy rain and flooding, and a significant ice storm. Rain totals up to 7 inches, with isolated higher amounts, will be possible. Significant icing up to a third of an inch may occur in the central Plains and Middle Missouri Valley. Continued cold weather with snow to low elevations out west.
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Last Update: 645 PM EST Tue Feb 20 2018

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Philadelphia, PA Local Forecast Office

31NM SSE New York NY

Marine Zone Forecast


...DENSE FOG ADVISORY IN EFFECT UNTIL 10 AM EST WEDNESDAY...
Synopsis: Bermuda high pressure slowly drifts to the south and east tonight through Wednesday. A cold front will then approach late Wednesday and pass through the region Wednesday night, then becomes nearly stationary over the Mid-Atlantic region. Several waves of low pressure will pass along this boundary through the weekend. High pressure returns for the start of the new work week.

Today
SW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. Swell mainly from the E with a dominant period of 10 seconds. patchy drizzle this morning. Areas of dense fog early this morning, then areas of fog late this morning. Patchy fog this afternoon. Vsby 1 nm or less, increasing to 1 to 3 nm late this morning and afternoon.
Tonight
SW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. Swell mainly from the E with a dominant period of 11 seconds. widespread dense fog. Vsby 1 nm or less.
Wed
SW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. Swell mainly from the E with a dominant period of 11 seconds. widespread dense fog in the morning with vsby 1 nm or less.
Wed Night
SW winds 10 to 15 kt with gusts up to 20 kt, becoming W 5 to 10 kt in the late evening and early morning, then becoming N late. Seas 3 to 5 ft. Swell mainly from the S with a dominant period of 9 seconds. a chance of showers in the evening, then a chance of rain after midnight. Vsby 1 nm or less in the late evening and overnight.
Thu
NE winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Seas 3 to 4 ft, building to 4 to 6 ft in the afternoon. A chance of rain in the morning, then rain likely in the afternoon.
Thu Night
NE winds around 15 kt with gusts up to 25 kt. Seas 4 to 6 ft. A chance of rain. Vsby 1 to 3 nm after midnight.
Fri
E winds 10 to 15 kt. Seas 4 to 6 ft. A chance of rain and sleet in the morning, then rain likely in the afternoon. Vsby 1 to 3 nm in the morning.
Fri Night
S winds 5 to 10 kt, becoming W after midnight. Seas 3 to 4 ft. A chance of rain.
Sat
W winds 5 to 10 kt, becoming SW in the afternoon. Seas 3 to 4 ft. A chance of rain in the afternoon.
Sat Night
SE winds around 5 kt, becoming E after midnight. Seas 3 to 4 ft. A chance of rain in the evening, then rain likely after midnight.
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Last Update: 645 PM EST Tue Feb 20 2018
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