Straits of Florida from Halfmoon Shoal to 20 NM west of Dry Tortugas out 20 to 60 NM Marine Forecast
| Tonight...East To Southeast Winds 15 To 20 Knots, Increasing To Near 20 Knots. Seas 3 To 5 Feet, Occasionally To 6 Feet, Increasing To 4 To 6 Feet, Occasionally To 8 Feet. Wave Detail: East 5 Feet At 6 Seconds. Showers With A Chance Of Thunderstorms. |
| Thursday...East To Southeast Winds Near 20 Knots, Decreasing To 15 To 20 Knots. Seas 5 To 6 Feet, Occasionally To 8 Feet. Wave Detail: East To Southeast 6 Feet At 6 Seconds. Showers Likely With A Chance Of Thunderstorms. |
| Thursday Night...East To Southeast Winds Near 20 Knots. Seas 5 To 6 Feet, Occasionally To 8 Feet. Wave Detail: East 5 Feet At 6 Seconds. A Chance Of Showers And Thunderstorms. |
| Friday...East To Southeast Winds 15 To 20 Knots. Seas 4 To 6 Feet, Occasionally To 8 Feet. A Chance Of Showers And Thunderstorms. |
| Friday Night...East Winds 15 To 20 Knots. Seas 4 To 5 Feet, Occasionally To 6 Feet. A Chance Of Showers And Thunderstorms. |
| Saturday...East To Southeast Winds 15 To 20 Knots. Seas Around 4 Feet, Occasionally To 5 Feet. A Chance Of Showers And Thunderstorms. |
| Saturday Night...East Winds Near 15 Knots. Seas 3 To 4 Feet, Occasionally To 5 Feet. A Chance Of Showers And Thunderstorms. |
| Sunday...East To Southeast Winds 10 To 15 Knots. Seas 2 To 3 Feet. A Chance Of Showers And Thunderstorms. |
| Sunday Night...East To Southeast Winds Near 10 Knots. Seas Around 2 Feet. A Chance Of Showers With A Slight Chance Of Thunderstorms. |
| Monday...Southeast Winds Near 10 Knots. Seas Around 2 Feet. A Chance Of Showers And Thunderstorms. |
| Monday Night...Southeast Winds 5 To 10 Knots. Seas 1 To 2 Feet. A Chance Of Showers And Thunderstorms. |
| Area Forecast Discussion National Weather Service Key West FL 153pm EDT Wednesday September 30 2026 Marine Issued at 1050am EDT Wednesday September 30 2026 There are no watches, warnings, or advisories in effect across the Florida Keys coastal waters at this time. Squally showers and thunderstorms had passed through the Lower and Middle Keys coast waters earlier this morning, leaving winds temporarily light and confused. Seas measured at Satan Shoal were running 3 feet with a 4 second period. From synopsis: A high pressure system along the Eastern Seaboard will shift further offshore and merge with an existing high pressure across the subtropical Atlantic and subsequently build through the remainder of the week. This will promote freshening breezes with an increasing likelihood of moderate to fresh breezes beginning Wednesday, continuing through late week. There is a good chance that marine Cautions may be required for portions of Keys waters at that time, and Advisories cannot be ruled out. In addition, a very wet pattern will remain across the Keys over the next few days, resulting in periods of scattered to numerous showers and thunderstorms. Issued at 417am EDT Wednesday September 30 2026 The Florida Keys are in a momentary lull with the KBYX radar surprisingly quiet all across our CWA. Nearest area of convection is moving off the north coast of Cuba and beginning to enter open waters. Time will tell if this activity lingers into our waters. Otherwise, we are in the thick of it so to speak. An upper level trough lies to our west across the central Gulf Basin, extending well into the Yucatan Peninsula. This has placed the Keys under a deep southerly flow that continues to transport tropical moisture from the western Caribbean. In fact, we're monitoring the nearly west to east line of convection that has been steadily moving north and is currently reaching Cuba. This line is on pace to reach the Keys between 0900-1200 today. Given this trajectory plus the deep tropical moisture influx and the presence of the nearby upper level trough, likely Probability of Precipitation can be expected today. In addition, we continue to be under the influence of King Tides, therefore, should heavy rain coincide with times of high tide, we could see brief periods of enhanced flooding. Meanwhile, to our north, a surface high pressure sits along the Eastern Seaboard. This feature will slowly meander offshore throughout the day and merge with an existing Atlantic Ridge and subsequently build. This will lead to freshening east to southeast breezes across the region. It is becoming increasingly likely that we will see a period of breezy conditions with marine Caution headlines likely across the surrounding coastal waters. There is a chance that given the early nature of this building high that models may be slightly underplaying the strength of the winds. Nonetheless, we can expect a period of moderate to fresh breezes at least through Friday. Thereafter, the ridge will gradually ease and allow for breezes to slowly slacken back to gentle to occasionally moderate over the weekend. As the high eases, we should see rain chances return closer to normal for what will be the first weekend of October. NOAA Key West FL Office: Watches - Warnings - Advisories FL...Coastal Flood Advisory until 5am EDT Thursday for FLZ076>078. GM...Small Craft Advisory until 11am EDT Thursday for GMZ052>055- 072>075. |
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