000
FXUS62 KKEY 070111
AFDKEY

AREA FORECAST DISCUSSION FOR THE FLORIDA KEYS
NATIONAL WEATHER SERVICE KEY WEST FL
915 PM EDT MON JUL 6 2009

.DISCUSSION...
.CURRENTLY... 
KBYX DETECTS NO PRECIPITATION ECHOES IN THE FORECAST AREA. SKIES 
OVER THE ISLAND CHAIN ARE PARTLY CLOUDY. WINDS OVER LAND ARE 
NORTHWEST NEAR 5 MPH. C-MAN WINDS...ON AVERAGE...ARE WEST TO 
NORTHWEST NEAR 5 KNOTS. TEMPERATURES ARE IN THE MID 80S. ONLY ABOUT 
THREE DEGREES OF COOLING IS EXPECTED TONIGHT DUE TO LIGHT AND 
VARIABLE SURFACE WINDS OVER WATER WITH TEMPERATURES IN THE UPPER 80S 
TO LOWER 90S. 

.SHORT TERM (OVERNIGHT)...
IN THE LOW TO MID LEVELS OF THE ATMOSPHERE...AN ATLANTIC RIDGE OF 
HIGH PRESSURE WILL BE LOCATED NEAR THE FLORIDA KEYS TONIGHT. IN THE 
UPPER LEVELS OF THE ATMOSPHERE...AN AREA OF HIGH PRESSURE...CENTERED 
OVER NORTHERN MEXICO...WILL BUILD EASTWARD ACROSS THE NORTHERN GULF 
OF MEXICO OVERNIGHT. THE 00Z KKEY SOUNDING IS MARGINALLY UNSTABLE 
AND TYPICALLY MOIST FOR THIS TIME OF YEAR...WITH A PRECIPITABLE 
WATER (PWAT) VALUE JUST ABOVE ONE AND THREE QUARTERS OF AN INCH. 
MOST OF THIS MOISTURE IS CONFINED BELOW 3000 FEET. ATMOSPHERIC 
MOISTURE SHOULD DECREASE OVERNIGHT. BY SUNRISE TUESDAY...PWAT VALUES 
MAY BE JUST ABOVE ONE AND ONE HALF OF AN INCH...WHICH WOULD BE BELOW 
NORMAL FOR EARLY JULY. ANTICYCLONIC FLOW IN ALL LEVELS OF THE 
ATMOSPHERE AND AN ANTICIPATED DECREASE IN ATMOSPHERIC MOISTURE WILL 
LIMIT RAIN CHANCES TO LESS THAN 10 PERCENT FOR THE FLORIDA KEYS 
TONIGHT. THE CURRENT ZONE FORECASTS FOR THE FLORIDA KEYS HANDLES 
THIS SITUATION WELL...SO NO UPDATES ARE EXPECTED.  

&&

.MARINE...
LIGHT AND VARIABLE BREEZES WILL PREVAIL ON ALL KEYS WATERS 
OVERNIGHT. NO ADVISORIES OR CAUTIONARY STATEMENTS EXPECTED OVERNIGHT 
THROUGH AT LEAST SATURDAY.    

&&

.AVIATION...
VFR CONDITIONS WILL PREVAIL OVERNIGHT AT THE KEY WEST AND MARATHON 
TERMINALS...WITH LIGHT WINDS AND FEW-SCT CLOUDS EXPECTED. ENJOY YOUR 
FLIGHT.

&&

.CLIMATE...
ON THIS DATE IN KEYS WEATHER HISTORY...IN 1881...THE HIGH  
TEMPERATURE IN KEY WEST WAS 95 DEGREES. THIS SET THE DAILY RECORD 
FOR MAXIMUM TEMPERATURE MEASURED IN KEY WEST ON JULY 6TH...A RECORD 
WHICH STILL STANDS 128 YEARS LATER. 

&&

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

&&

$$

PUBLIC/MARINE/FIRE/CLIMATE/DIGITAL...BS
AVIATION//NOWCASTS...................DFM
DATA ACQUISITION.....................DR

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