104
FXUS62 KKEY 201546
AFDKEY
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE KEY WEST FL
1046 AM EST FRI DEC 20 2024
..NEW DISCUSSION, MARINE, AVIATION
DISCUSSION
ISSUED AT 1013 AM EST FRI DEC 20 2024
WATER VAPOR IMAGERY HIGHLIGHTS A WEAKENING REX BLOCK ACROSS THE
CONUS, FEATURING BROAD CYCLONIC FLOW ACROSS THE EASTERN U.S. AND
A RIDGE-CUTOFF LOW COMPLEX OVER THE ROCKIES AND THE BAJA
PENINSULA. THE DISTAL END OF A BROAD ATMOSPHERIC RIVER IS NEAR THE
PACIFIC NORTHWEST. SURFACE OBSERVATIONS AND VISIBILE/INFRARED
SATELLITE IMAGERY PLACE A PAIR OF SURFACE CYCLONES NEAR THE OHIO
RIVER VALLEY AND EAST OF THE CAROLINAS. NEARLY UNINTERRUPTED
CONTINENTAL-POLAR AIR CONTINUES TO SPREAD SOUTHEAST FROM THE
NORTHERN PLAINS TO THE EASTERN GULF OF MEXICO. IN PAST COUPLE OF
HOURS, NORTHWEST WINDS AT THE REEF INCREASED TO 15 TO 20 KNOTS AS
THE FIRST OF A PAIR OF WEAK COLD FRONTS CLEARED THE KEYS. SKIES
ARE NOW MOSTLY SUNNY AND THE KBYX RADAR IS ECHO FREE. THE FORECAST
CALLS FOR HIGHS IN THE MID 70S AND NIL RAIN CHANCES. DEWPOINTS
WILL FALL ABOUT 15 DEGREES IN THE NEXT 24-HOURS, WITH OVERNIGHT
LOWS FALLING INTO THE UPPER 50S FOR SOME LOCATIONS. NO CHANGES ARE
NEEDED WITH THIS UPDATE.
MARINE
ISSUED AT 1013 AM EST FRI DEC 20 2024
SMALL CRAFT SHOULD EXERCISE CAUTION FOR NORTHWEST TO NORTH WINDS
15 TO 20 KNOTS. SMALL CRAFT ADVISORY MAY BE REQUIRED TONIGHT AS
WINDS INCREASE TO NEARLY 20 KNOTS. FROM SYNOPSIS, MODERATE TO
FRESH NORTHWEST TO NORTH BREEZES WILL PREVAIL ACROSS THE COASTAL
WATERS OF THE FLORIDA KEYS TODAY AND TONIGHT. STRONG HIGH PRESSURE
WILL BUILD ACROSS THE EASTERN UNITED STATES SATURDAY THROUGH
SUNDAY, RESULTING IN A STRENGTHENING PRESSURE GRADIENT. THIS WILL
PROMOTE FRESHENING NORTHEAST TO EAST BREEZES PERSISTING INTO EARLY
NEXT WEEK.
AVIATION
(15Z TAFS)
ISSUED AT 1013 AM EST FRI DEC 20 2024
A SHORT PERIOD OF IFR CIGS WILL CLEAR EYW OVER THE NEXT FEW HOURS,
LEAVING BEHIND VFR CONDITIONS FOR THE REMAINDER OF THE TAF BASED ON
SATELLITE TRENDS SHOWING EROSION OF THE BACK SIDE OF THE LOW CLOUD
FIELD AS IT CROSSES THE ISLAND CHAIN. MTH WILL REMAIN IN VFR THROUGH
THE PERIOD. WINDS WILL REMAIN FROM THE NORTH TO NORTHWEST THROUGH
THE PERIOD.
PRELIMINARY POINT TEMPS/POPS
KEY WEST 77 63 70 61 / 0 0 0 0
MARATHON 78 61 70 61 / 0 0 0 0
KEY WATCHES/WARNINGS/ADVISORIES
FL...NONE.
GM...NONE.
PUBLIC/MARINE/FIRE...CLR
AVIATION/NOWCASTS....MC
DATA ACQUISITION.....BT
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