Wet Pattern Continues From the Northwest To Rockies; Major Storm System To Develop On Thursday Across Southern Plains

A vigorous system will slide from the Northwest to the Rockies on Wednesday to keep intact the wet pattern across the extended region. Heavy to excessive rain, intense mountain snow and high winds are possible before the next system arrives on Friday. The same system will evolve into a major storm on Thursday across the southern Plains for a widespread rain event for the South and East.
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Hazardous Weather Conditions

Last Update: 1030 AM EST Wed Dec 12 2018

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Key West, FL Local Forecast Office

3NM N American Shoal Light FL

Marine Zone Forecast


Synopsis: High pressure will move east from the Lower Mississippi Valley, reaching the southeastern Atlantic coast tonight, then east into the Western Atlantic Thursday. Thereafter, a low pressure system over Arkansas will move east and drag another cold front across the Gulf of Mexico Thursday night through Friday, reaching the Keys Coastal waters late Friday into Saturday.

The Approximate Shoreward Edge of the Gulf Stream as of December 11, 2018...

23 NM South of Dry Tortugas Light...on Loggerhead Key. 7 NM South of Cosgrove Shoal Light...off the Marquesas Keys. 7 NM South of Sand Key Light...off Key West. 8 NM South of Looe Key...off Big Pine Key. 6 NM South of Sombrero Key Light...off Marathon. 8 NM Southeast of Alligator Reef Light...off Islamorada. 2 NM Southeast of Molasses Reef Light...off Key Largo. 1 NM East of Carysfort Reef Light...off Ocean Reef.

Gulf Stream Information Courtesy of the Naval Oceanographic Office.

This Afternoon
North to northeast winds near 15 knots, becoming northeast to east at 10 to 15 knots. Seas 1 to 3 feet. nearshore waters a moderate chop, becoming a light to moderate chop.
Tonight
East winds near 15 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop. Isolated showers.
Thursday
East to southeast winds 10 to 15 knots. Seas 2 to 3 feet. Nearshore waters a light to moderate chop. Isolated showers.
Thursday Night
Southeast winds 15 to 20 knots. Seas building to 2 to 4 feet. Nearshore waters choppy. Scattered showers.
Friday
South winds 15 to 20 knots. Seas 2 to 4 feet. Nearshore waters choppy. Scattered showers and thunderstorms.
Friday Night
Winds becoming west to northwest and decreasing to 10 to 15 knots. Seas 2 to 3 feet. Nearshore waters a light to moderate chop. Scattered showers and thunderstorms.
Saturday
West to northwest winds near 15 knots. Seas 2 to 3 feet, except 4 to 6 feet west of cosgrove shoal light. Nearshore waters a light to moderate chop. Scattered showers.
Saturday Night
Northwest winds 10 to 15 knots. Seas 2 to 3 feet, except 4 to 6 feet west of cosgrove shoal light. Nearshore waters a light to moderate chop. Isolated showers.
Sunday
Northwest winds near 10 knots. Seas 1 to 3 feet. nearshore waters a light chop.
Sunday Night
Northwest to north winds 10 to 15 knots. Seas 1 to 3 feet. Nearshore waters a light to moderate chop.
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Last Update: 1030 AM EST Wed Dec 12 2018
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