Powerful Storm to Impact Eastern Third of U.S. this weekend.

A developing storm system will bring a myriad of significant impacts this weekend. Heavy snow up to 18 inches from the Ohio Valley to the Northeast, and ice up to a quarter of an inch is forecast in places. Heavy rain may cause flash flooding from the Mid-South to the Mid-Atlantic. Severe thunderstorms with damaging winds and isolated tornadoes will be possible in the Deep South.
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Hazardous Weather Conditions

Last Update: 909 PM EST Fri Jan 18 2019

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Miami - South Florida Local Forecast Office

4NM WSW Marco Island FL

Marine Zone Forecast


Synopsis: East to southeasterly flow will continue across the Atlantic and Gulf coastal waters tonight before starting to shift to a more southerly direction on Saturday. Seas will remain on the low side during this time frame, however, they are expected to increase on Saturday night into Sunday as a cold front moves through the local waters. Breezy northwest winds are expected across all waters in the wake of the front on Sunday. A Small Craft Advisory could be required across both Gulf and Atlantic waters as early as Saturday night.

.GULF STREAM HAZARDS...None

THE APPROXIMATE LOCATION OF THE WEST WALL OF THE GULF STREAM IS CURRENTLY UNAVAILABLE.

Rest Of Tonight
Nearshore, east northeast winds after midnight. Winds north northeast 5 knots late in the evening. Offshore, east winds after midnight. Seas less than 2 feet. Period 3 seconds. Bay and inland waters smooth.
Saturday
South southeast winds 5 to 10 knots. Seas less than 2 feet. Period 2 seconds. Bay and inland waters a light chop.
Saturday Night
South southwest winds 10 to 15 knots nearshore and south southwest 15 to 20 knots offshore. Seas 2 to 3 feet. Period 3 seconds. Bay and inland waters choppy in exposed areas. Showers and a slight chance of thunderstorms after midnight.
Sunday
Northwest winds 15 to 25 knots. Seas 4 to 6 feet with occasional seas to 8 feet nearshore and 6 to 8 feet with occasional to 10 feet offshore. Period 4 seconds increasing to 9 seconds in the afternoon. Bay and inland waters a moderate chop. Showers likely and a slight chance of thunderstorms in the morning...then a slight chance of showers in the afternoon.
Sunday Night
North winds 15 to 20 knots with gusts to around 30 knots. Seas 3 to 5 feet with occasional seas to 6 feet nearshore and 5 to 7 feet with occasional to 9 feet offshore. West northwest swell 3 feet after midnight. Bay and inland waters a moderate chop.
Monday
Northeast winds 10 to 15 knots. Nearshore, seas 2 to 3 feet. Offshore, seas 4 to 6 feet with occasional seas to 8 feet subsiding to 2 to 4 feet with occasional seas to 5 feet in the afternoon. Bay and inland waters a light chop.
Monday Night And Tuesday
East southeast winds 10 to 15 knots. Seas 2 to 3 feet. Bay and inland waters a light chop.
Tuesday Night
Southeast winds around 15 knots. Seas 2 to 3 feet. Bay and inland waters a light chop.
Wednesday
South southeast winds around 15 knots. Seas 2 to 3 feet. Bay and inland waters a light chop. A chance of showers.
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ABOUT THIS FORECAST

Last Update: 909 PM EST Fri Jan 18 2019
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