Area Forecast Discussion
Issued by NWS Key West, FL
Issued by NWS Key West, FL
916 FXUS62 KKEY 241733 AFDKEY Area Forecast Discussion National Weather Service Key West FL 133 PM EDT Fri Apr 24 2026 ...New AVIATION... .KEY MESSAGES... - Rain and thunderstorm chances will remain elevated today followed by diminishing rain chances tonight. - Dry conditions quickly return tonight and continue through the upcoming weekend. && .AVIATION... (18Z TAFS) Issued at 133 PM EDT Fri Apr 24 2026 Convection is moving into both terminals requiring TEMPOs for low visibility, ceilings, gusty winds and shower activity. For the time being, showers are moderate, therefore only MVFR conditions are expected, but heavier showers later could impact visibility further. This evening, showers will start to dissipate and VFR conditions will prevail. Outside of convection, winds will be easterly at near 10 knots. && .PREVIOUS DISCUSSION... Issued at 443 AM EDT Fri Apr 24 2026 Looking at CIMSS products again this morning, there is an Omega block across the northern half of the Lower 48. Omega as the pattern resembles the Greek letter. There is a definitive trough- ridge-trough pattern that remains in place. One trough is over the Northern Plains with the other trough over the Canadian Maritimes into New England with a skinny ridge over the Great Lakes region extending northward into Canada. To the south, a split flow regime continues with weak ridging across the Southeast U.S. and a digging trough across the southern Gulf, northwest Caribbean and Florida Keys. Embedded in this trough is a potent upper level shortwave which is currently rotating through the Keys early this morning. CIMSS Mimic total precipitable water shows increased moisture across the northwest Caribbean, Cuba, and across the western Florida Keys coverage area. KBYX radar has been active overnight, though only in regards to some very light rain moving from west to east across the eastern portions of the area. In the last hour, we have seen slightly more robust showers develop across the western Straits of Florida. GOES 19 Nighttime Microphysics imagery shows plentiful cloud cover across the Keys leading to mostly cloudy skies. At the surface, high pressure remains in place across the western North Atlantic. Marine observation platforms surrounding the Island Chain are recording mainly east to southeast breezes of 10 to 15 knots, though, near 15 knots across the western portions of the area as Sand Keys is currently 16 knots gusting 19 knots. Temperatures along the Island Chain are in the mid 70s and dew points are in the lower to mid 60s. .FORECAST... The main story for the next 12 hours will be determining exactly what the backside of this upper level shortwave trough does as it pivots through the Keys. Latest guidance suggests showers and thunderstorms expanding in coverage this morning (around daybreak or slightly after). There are some indications for this activity to be slow moving with whatever does develop. Therefore, there is the potential for some locally heavy rainfall wherever any showers and thunderstorms move over. Also, this could very well end up over the marine area sparing the Island Chain communities. The best chance time for showers and thunderstorms appears to be between 24/12z and 25/00z as of now. All of the ingredients remain in place for this to be a potentially wet day for some locations. We have the instability, trigger (upper level shortwave trough) and the moisture. Any shower and storms will be capable of producing heavy downpours, frequent lightning, and gusty winds. Based on the latest hi-res model trends, we decided to raise the rain chances to 50% for today and that may very well end up too high or too low depending on how the day pans out. Once we get to late Friday afternoon/evening, this shortwave trough will be well on its way to the Bahamas allowing the Keys to begin to clear out. Upper level heights remain expected to rise over the weekend into the middle part of next week as the aforementioned shortwave trough moves away from the region. This will leave the Keys in northwesterly flow aloft for several days. At the surface, high pressure will remain dominant under generally weak flow. Therefore, expect warming temperatures with highs in the mid 80s with some indications for upper 80s in some locations. Also, anticipate rising dew points and increasing humidity. Nil rain chances remain for now due to dry air lingering across the area. && .MARINE... Issued at 1146 AM EDT Fri Apr 24 2026 No watches, warnings, or advisories are currently in effect for the coastal waters of the Florida Keys. From synopsis, high pressure over the western North Atlantic will slowly crawl away from the area, and breezes will continue to gradually slacken through tonight. Weak high pressure will maintain control over the weekend, and into early next week, promoting light to gentle breezes. && .KEY WATCHES/WARNINGS/ADVISORIES... FL...None. GM...None. && $$ Public/Marine/Fire...AP Aviation/Nowcasts....AP Data Acquisition.....AP Visit us on the web at weather.gov/key Follow us on Facebook and Twitter at: www.facebook.com/nwskeywest www.twitter.com/nwskeywest