Marine Weather Net

Straits of Florida from Craig Key to West End of Seven Mile Bridge out 20 - 60 NM Marine Forecast


THIS AFTERNOON

E
WINDS
25
KNOTS

TONIGHT

E
WINDS
20 - 25
KNOTS

MONDAY

NE
WINDS
20
KNOTS

MONDAY NIGHT

NE
WINDS
20
KNOTS

The Marine Weather Forecast In Detail:
GMZ073 Forecast Issued: 1026 AM EDT Sun Sep 22 2019

SMALL CRAFT ADVISORY IN EFFECT
This Afternoon...Northeast To East Winds 25 To 30 Knots, Decreasing To Near 25 Knots. Seas 7 To 11 Feet. Numerous Showers And Isolated Thunderstorms.
Tonight...Northeast To East Winds 20 To 25 Knots. Seas 6 To 10 Feet. Numerous Showers And Isolated Thunderstorms.
Monday...Northeast Winds Near 20 Knots. Seas 5 To 8 Feet. Numerous Showers And Isolated Thunderstorms.
Monday Night...Northeast Winds Near 20 Knots, Decreasing To 15 To 20 Knots After Midnight. Seas 4 To 7 Feet. Scattered Showers And Isolated Thunderstorms.
Tuesday...Northeast Winds Near 15 Knots. Seas Subsiding To 2 To 5 Feet. Scattered Showers And Isolated Thunderstorms.
Tuesday Night...Northeast To East Winds 10 To 15 Knots. Seas 2 To 3 Feet. Isolated Showers.
Wednesday...Northeast To East Winds Near 10 Knots. Seas 1 To 3 Feet. Isolated Showers.
Wednesday Night...East Winds 10 To 15 Knots. Seas 2 To 3 Feet. Isolated Showers.
Thursday...East Winds Near 10 Knots. Seas 1 To 2 Feet. Isolated Showers.
Thursday Night...East Winds 10 To 15 Knots. Seas 2 To 3 Feet. Scattered Showers And Isolated Thunderstorms.
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Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas: GMZ005
1026 AM EDT Sun Sep 22 2019

Strong northeast to east breezes will continue across the Florida Keys coastal waters this afternoon, between high pressure over the Southeast United States and lower pressure over the western Caribbean. The high pressure will gradually weaken tonight through Tuesday, allowing easterly breezes to slowly diminish. Gentle to moderate east breezes will prevail from Tuesday night through Thursday night, as weak high pressure lingers over the Florida peninsula.

Gulf Stream
The Approximate Shoreward Edge of the Gulf Stream as of September 21...
- 55 NM South of Dry Tortugas Light...on Loggerhead Key.
- 33 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
- 27 NM South of Sand Key Light...off Key West.
- 21 NM South of Looe Key...off Big Pine Key.
- 18 NM South of Sombrero Key Light...off Marathon.
- 21 NM Southeast of Alligator Reef Light...off Islamorada.
- 20 NM Southeast of Molasses Reef Light...off Key Largo.
- 13 NM East of Carysfort Reef Light...off Ocean Reef.
Area Forecast Discussion
National Weather Service Key West FL
1031am EDT Sunday September 22 2019

Mid to upper-level ridging centered over the northern Gulf Coast reaches northeast into the eastern United States. A high pressure cell centered over the extreme western North Atlantic stretches west to the southern Appalachians. Water vapor imagery highligheights an orphaned upper-level low marching west through the southern Gulf of Mexico. MIMIC TPW loops highlight an extreme gradient in moisture across South Florida and the Florida Keys. The 12Z KKEY RAOB (Radiosonde Observation or Upper-Air Observation) was near a daily maximum for PW (2.41"), while KMFL set their daily minimum PW (1.23"). Since our launch nearly three hours ago, squalls and showers have shifted south into the Straits of Florida, indicating the drier air to our north successfully has battled for tropical real estate. Strong northeast to east breezes persist at the land and marine observations stations. The KBYX VWP continues to sample 33 knots of wind at 1 kft. We updated the forecast based on hints from the overnight crew, and on recent radar trends. Rain chances are 50% for the remainder of the afternoon across the island chain. Highs should only reach the mid 80s based on the extensive cloud debris streaming north from storms in the Straits. No other changes needed or planned.

Marine
Small Craft Advisories remain in effect for all coastal waters of the Florida Keys. From synopsis, strong northeast to east breezes will continue across the Florida Keys coastal waters this afternoon, between high pressure over the Southeast United States and lower pressure over the western Caribbean. The high pressure will gradually weaken tonight through Tuesday, allowing easterly breezes to slowly diminish. Gentle to moderate east breezes will prevail from Tuesday night through Thursday night, as weak high pressure lingers over the Florida peninsula.

NOAA Key West FL Office: Watches - Warnings - Advisories
FL...None. GM...Small Craft Advisory GMZ031>035-042>044-052>055-072>075.