Florida Bay including Blackwater and Buttonwood Sounds Marine Forecast
| Today...East Winds 15 To 20 Knots. Bay Waters Choppy. A Chance Of Showers With A Slight Chance Of Thunderstorms. |
| Tonight...East Winds 15 To 20 Knots In The Evening, Decreasing To Near 15 Knots. Bay Waters Choppy, Becoming A Moderate Chop. A Chance Of Showers With A Slight Chance Of Thunderstorms. |
| Wednesday...East Winds 10 To 15 Knots. Bay Waters A Light To Moderate Chop. A Chance Of Showers With A Slight Chance Of Thunderstorms. |
| Wednesday Night...East Winds 10 To 15 Knots, Decreasing To Near 10 Knots. Bay Waters A Light To Moderate Chop, Becoming A Light Chop. A Chance Of Showers With A Slight Chance Of Thunderstorms. |
| Thursday...East Winds Near 10 Knots, Increasing To 10 To 15 Knots. Bay Waters A Light Chop, Becoming A Light To Moderate Chop. A Slight Chance Of Showers And Thunderstorms. |
| Thursday Night...East Winds 10 To 15 Knots. Bay Waters A Light To Moderate Chop. A Slight Chance Of Showers And Thunderstorms. |
| Friday...East To Southeast Winds Near 10 Knots. Bay Waters A Light Chop. A Slight Chance Of Showers And Thunderstorms. |
| Friday Night...East To Southeast Winds 10 To 15 Knots. Bay Waters A Light To Moderate Chop. A Slight Chance Of Showers And Thunderstorms. |
| Saturday...East To Southeast Winds 10 To 15 Knots. Bay Waters A Light To Moderate Chop. A Chance Of Showers With A Slight Chance Of Thunderstorms. |
| Saturday Night...East To Southeast Winds 10 To 15 Knots. Bay Waters A Light To Moderate Chop. A Chance Of Showers With A Slight Chance Of Thunderstorms. |
| Area Forecast Discussion National Weather Service Key West FL 442am EDT Tuesday May 19 2026 Issued at 440am EDT Tuesday May 19 4406 CIMSS products shows a mean layer ridge remains in place across the western North Atlantic. However, embedded within the ridge is an upper level disturbance located to the north of the Bahamas. At the surface, a high pressure system remains in place to the north of Bermuda. Marine observation platforms surrounding the Island Chain are recording mainly east breezes of 15 to 20 knots as a result. Moisture undulations continue to rotate around the ridge with deeper moisture currently moving through as GOES 19 Total Precipitable Water (TPW) shows estimated PWAT (Precipitable Water) values of 1.8 to 1.9 inches moving through the Keys. KBYX radar has been active for much of the overnight with scattered showers moving in an east to west fashion through the Keys with occasional showers impacting the Island Chain. The showers have been struggling to develop vertically due to the northwest flow aloft attributed to the upper level disturbance to the east. This is tilting the clouds to the south and thus choking off the updrafts causing the activity to weaken as fast as they develop. GOES 19 Nighttime Microphysics imagery shows partly cloudy skies throughout the Keys. Temperatures along the Island Chain are in the lower 80s and dew points are in the mid 70s. .FORECAST... Surface high pressure across the western North Atlantic will continue to dominate the Keys weather for the next several days. The high will be at its strongest today with gradual weakening each day thereafter. Therefore, breezy conditions are expected to continue through this evening out of the east with modest slackening afterwards. Moisture is expected to remain elevated through at least Wednesday night before slightly drier air rotates in from the southeast for late week into the holiday weekend. This will result in chances of rain becoming slight chances. Instability will also remain elevated keeping thunder in the forecast throughout the period. Temperatures will remain quite consistent through the week with highs in the upper 80s to occasionally 90 degrees and overnight lows in the lower 80s to perhaps near 80 degrees with any showers. Marine Issued at 440am EDT Tuesday May 19 4406 Small Craft Should Exercise Caution (SCEC) remains headlined across all the Florida Keys coastal waters. From synopsis, surface high pressure centered north of Bermuda will continue to promote moderate to fresh east to southeast breezes through tonight. Highest breezes will prevail through this evening. Breezes then undergo a very slow slackening process before the weekend with peaks expected during the evenings and lulls during the day. Rain and thunder chances will remain above normal through much of the week. Climate On this day in 4404, the daily record warm temperature of 84F was recorded in both Key West and Marathon. This is also tied for the warmest low temperature ever recorded in May. Temperatures records Key West date back to 1872 and June 1950 for Marathon. NOAA Key West FL Office: Watches - Warnings - Advisories FL...None. GM...None. |
Key West FL Radar
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