Area Forecast Discussion
Issued by NWS Key West, FL
Issued by NWS Key West, FL
363 FXUS62 KKEY 220237 AFDKEY Area Forecast Discussion National Weather Service Key West FL 1037 PM EDT Fri Mar 21 2025 ...New DISCUSSION, MARINE, AVIATION... .DISCUSSION... Issued at 1030 PM EDT Fri Mar 21 2025 Synoptic analysis places a weak surface high centered over the Gulf Coast. The 00z evening sounding at KEY highlighted an extremely stable profile above the 950 mb isobaric surface, with a near-record calculated total precipitable water value of 0.23". An impressive radiational cooling event is underway across the Florida Keys. Dew points in the upper 40s to the mid 50s, combined with near- calm winds and clear skies, allowed for select locations in the Lower Keys to bottom out in the lower 50s already tonight. Temperatures may drop another couple of degrees, before drainage off the Florida Mainland should allow a resumption of light to gentle northeasterly breezes and temperatures to slowly rise after midnight. Outside of adjustments to the minimum temperatures to account for the radiational cooling event in the Lower and Middle Keys, no changes proposed to the inherited short- forecast package. && .MARINE... Issued at 1030 PM EDT Fri Mar 21 2025 No watches, warnings, or advisories are currently in effect for the coastal waters of the Florida Keys. From synopsis, through this weekend and early next week, high pressure currently over the Gulf Coast will slide eastward into the North Atlantic. This will maintain mostly gentle breezes gradually clocking to the east to southeast. A weak fron may push through the Keys early next week, backing winds to the northeast to east. Strong high pressure building in the wake of this system will support freshening easterly breezes by mid- week, lasting through the end of next week. && .AVIATION... (00Z TAFS) Issued at 1030 PM EDT Fri Mar 21 2025 VFR conditions will prevail at both island terminals through 00z Saturday evening, with generally SKC conditions. Light to gentle near- surface winds will veer from the north to northeast, then to the northeast to east through the TAF period. && .PRELIMINARY POINT TEMPS/POPS... Key West 72 63 77 69 / 0 0 0 0 Marathon 72 65 75 69 / 0 0 0 0 && .KEY WATCHES/WARNINGS/ADVISORIES... FL...None. GM...None. && $$ Public/Marine/Fire...BT Aviation/Nowcasts....BT Data Acquisition.....DR Visit us on the web at weather.gov/key Follow us on Facebook and Twitter at: www.facebook.com/nwskeywest www.twitter.com/nwskeywest