Area Forecast Discussion
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000
FXUS62 KKEY 190117
AFDKEY

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE KEY WEST FL
920 PM EDT SAT APR 18 2015

.DISCUSSION...
.CURRENTLY...
KBYX DETECTS NO PRECIPITATION ECHOES IN THE FORECAST AREA. SKIES
OVER THE ISLAND CHAIN ARE MOSTLY CLEAR. WINDS OVER LAND ARE
SOUTHEAST TO SOUTH AT 5 TO 10 MPH. C-MAN WINDS...ON AVERAGE...ARE
SOUTHEAST AT 5 TO 10 KNOTS. TEMPERATURES ARE IN THE LOWER 80S.

.SHORT TERM (OVERNIGHT)...
IN THE LOW LEVELS OF THE ATMOSPHERE...AN ATLANTIC RIDGE OF HIGH
PRESSURE WILL EXTEND ACROSS SOUTH FLORIDA OVERNIGHT. IN THE MID
LEVELS OF THE ATMOSPHERE...A WEAK AREA OF HIGH PRESSURE WILL BE
CENTERED OVER THE SOUTHEASTERN BAHAMAS TONIGHT. IN THE UPPER LEVELS
OF THE ATMOSPHERE...BROAD...ANTICYCLONIC FLOW WILL PREVAIL
OVERNIGHT. THE 00Z KKEY SOUNDING IS MODERATELY UNSTABLE AND MOIST
FOR THIS TIME OF YEAR...WITH A PRECIPITABLE WATER (PWAT) VALUE JUST
UNDER ONE AND ONE HALF OF AN INCH. ATMOSPHERIC MOISTURE WILL
INCREASE OVERNIGHT. BY SUNRISE SUNDAY...PWAT VALUES WILL BE JUST
BELOW ONE AND THREE QUARTERS OF AN INCH...WHICH IS NEAR THE 75TH
PERCENTILE FOR THE LATTER HALF OF APRIL. DESPITE ABUNDANT
ATMOSPHERIC MOISTURE AND INSTABILITY IN PLACE TO SUPPORT
CONVECTION...ANTICYCLONIC FLOW IN ALL LEVELS OF THE ATMOSPHERE
SHOULD BE RESPONSIBLE FOR A NEAR ZERO CHANCE OF RAIN FOR THE FLORIDA
KEYS TONIGHT.

&&

.MARINE...
LIGHT SOUTHEAST BREEZES WILL PREVAIL ON ALL KEYS COASTAL WATERS
OVERNIGHT. NO ADVISORIES OR CAUTIONARY HEADLINES EXPECTED TONIGHT
THROUGH AT LEAST THURSDAY NIGHT.

&&

.AVIATION...
VFR CONDITIONS ARE EXPECTED AT THE KEY WEST AND MARATHON TERMINALS
OVERNIGHT. LOW LEVEL WIND WILL AVERAGE FROM THE SOUTHEAST AT 5 TO 10
KNOTS. JUST A FEW CLOUDS ARE POSSIBLE AT FL015-020.

&&

.CLIMATE...
ON THIS DATE IN FLORIDA KEYS WEATHER HISTORY...IN 1899...1.37 INCHES
OF RAIN FELL IN KEY WEST. THIS SET THE DAILY RECORD FOR MAXIMUM
RAINFALL MEASURED IN KEY WEST ON APRIL 18TH...A RECORD WHICH STILL
STANDS 116 YEARS LATER. RAINFALL RECORDS AT KEY WEST DATE BACK TO
1871.

&&

.KEY WATCHES/WARNINGS/ADVISORIES...
FL...NONE.
GM...NONE.

&&

$$

PUBLIC/MARINE/FIRE/CLIMATE/DIGITAL...BS
AVIATION.............................FUTTERMAN
DATA ACQUISITION.....................VICKERY

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