Marine Weather Net

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


TONIGHT

ESE
WINDS
10 - 15
KNOTS

WEDNESDAY

ESE
WINDS
10
KNOTS

WEDNESDAY NIGHT

E
WINDS
15
KNOTS

THURSDAY

ENE
WINDS
10 - 15
KNOTS

The Marine Weather Forecast In Detail:
GMZ053 Forecast Issued: 430 PM EDT Tue Jun 22 2021

Tonight...East To Southeast Winds 10 To 15 Knots. Seas 2 To 3 Feet. Isolated Showers And Thunderstorms.
Wednesday...East To Southeast Winds Near 10 Knots. Seas 1 To 3 Feet. Scattered Showers And Isolated Thunderstorms.
Wednesday Night...East Winds Near 15 Knots. Seas Building To 3 To 4 Feet. Scattered Showers And Thunderstorms.
Thursday...Northeast To East Winds 10 To 15 Knots. Seas 2 To 4 Feet. Scattered Showers And Thunderstorms.
Thursday Night...East Winds 15 To 20 Knots. Seas 3 To 5 Feet. Scattered Showers And Thunderstorms.
Friday...East Winds Decreasing To Near 15 Knots. Seas 3 To 5 Feet. Scattered Showers And Thunderstorms.
Friday Night...East To Southeast Winds 15 To 20 Knots. Seas 3 To 5 Feet. Scattered Showers And Isolated Thunderstorms.
Saturday...East Winds Decreasing To 10 To 15 Knots. Seas 2 To 4 Feet. Scattered Showers And Isolated Thunderstorms.
Saturday Night...East To Southeast Winds 10 To 15 Knots. Seas 2 To 4 Feet. Scattered Showers And Isolated Thunderstorms.
Sunday And Sunday Night...East To Southeast 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
430 PM EDT Tue Jun 22 2021

An expansive high pressure cell from the western North Atlantic to the southeastern United States will be the primary driver of local winds and seas through the week. The shape and location of the associated high pressure ridge across the Florida Peninsula will fluctuate, resulting in east to southeast breezes undergoing peaks and lulls across Florida Keys coastal waters, from this afternoon through Saturday. Both rain and thunderstorm chances will increase by mid-week, with winds and seas higher in and near scattered thunderstorms, from Wednesday night through Friday.

Gulf Stream
The Approximate Shoreward Edge of the Gulf Stream as of June 17, 2021...
- 21 NM South of Dry Tortugas Light...on Loggerhead Key.
- 8 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
- 8 NM South of Sand Key Light...off Key West.
- 11 NM South of Looe Key...off Big Pine Key.
- 12 NM South of Sombrero Key Light...off Marathon.
- 10 NM Southeast of Alligator Reef Light...off Islamorada.
- 8 NM Southeast of Molasses Reef Light...off Key Largo.
- 8 NM East of Carysfort Reef Light...off Ocean Reef.
Area Forecast Discussion
National Weather Service Key West FL
300pm EDT Tuesday Jun 22 2021

Visible satellite is depicting mostly sunny skies across the Florida Keys this afternoon, with the upper-level cirrus deck mostly dissipated. Temperatures are in the upper 80s, with dewpoints in the upper 70s. This has brought the heat index or "real feel temperature" up to near 100 degrees in most locations across the island chain. Summertime is in full swing! KBYX is currently mostly echo-free, with only a few brief showers and one thunderstorm moving through the Straits of Florida earlier this afternoon. Some high-res models have convection moving through the Gulf Waters and across the Keys this evening, but there is uncertainty surrounding this evolution. Have kept 20% rain chances for tonight for now due to this uncertainty.

High pressure currently centered in the Western Atlantic will slowly migrate north, shifting our winds to the east starting tomorrow afternoon. Aloft, an upper-level trough will approach the area and continue to break down the upper-level ridge that has been parked near our area for the past few days. This will allow winds to decrease tonight through tomorrow night. Mesoscale processes, such as cloud line development, will likely dominate tomorrow. Models have indicated that convection may move off of the Mainland tomorrow evening and push through the Gulf and Bayside Waters and through the Florida Keys tomorrow night. Have increased Probability of Precipitation to 50% for tomorrow night due to this possible activity. Ridging will begin to build back into the region starting on Wednesday night, which will increase winds. Peaks and lulls in the winds will occur through Saturday and that, combined with increased moisture, will aid in the development of showers and thunderstorms across our area, so have nudged Probability of Precipitation up through the end of the workweek into the weekend. Starting next week, a slug of moisture may move through the area, bringing increased rain chances to begin the week off, however, have just gone with closer to climatology for now.

Marine
There are no watches, warnings, or advisories currently in effect for the coastal waters of the Florida Keys. From synopsis, An expansive high pressure cell from the western North Atlantic to the southeastern United States will be the primary driver of local winds and seas through the week. The shape and location of the associated high pressure ridge across the Florida Peninsula will fluctuate, resulting in east to southeast breezes undergoing peaks and lulls across Florida Keys coastal waters, from this afternoon through Saturday. Both rain and thunderstorm chances will increase by mid-week, with winds and seas higher in and near scattered thunderstorms, from Wednesday night through Friday.

Climate
On this day 1901, the daily record low temperature of 70F was last recorded in Key West. Temperature records date back to 1872.

NOAA Key West FL Office: Watches - Warnings - Advisories
FL...None. GM...None.