676  
FXUS62 KKEY 201344  
AFDKEY  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE KEY WEST FL  
944 AM EDT SUN MAY 20 2018  
   
DISCUSSION
 
   
CURRENTLY
 
 
KBYX DETECTS SCATTERED SHOWERS THROUGHOUT THE FORECAST AREA. SKIES  
OVER THE ISLAND CHAIN ARE MOSTLY CLOUDY. WINDS OVER LAND ARE EAST  
TO SOUTHEAST NEAR 15 MPH. C-MAN WINDS, ON AVERAGE, ARE EAST TO  
SOUTHEAST AT 15 TO 20 KNOTS. TEMPERATURES ARE NEAR 80 DEGREES.  
   
SHORT TERM (THIS AFTERNOON)
 
 
IN THE LOW TO MID LEVELS OF THE ATMOSPHERE, A TROUGH OF LOW  
PRESSURE NEAR SOUTH FLORIDA WILL MOVE INTO THE EASTERN GULF OF  
MEXICO THIS AFTERNOON. IN THE UPPER LEVELS OF THE ATMOSPHERE, AN  
AREA OF LOW PRESSURE WILL BE CENTERED OVER THE NORTHEASTERN GULF  
OF MEXICO TODAY. THE 12Z KKEY SOUNDING IS MODERATELY UNSTABLE AND  
EXCEPTIONALLY MOIST FOR THIS TIME OF YEAR, WITH A PRECIPITABLE  
WATER VALUE JUST ABOVE TWO INCHES. ATMOSPHERIC MOISTURE WILL  
REMAIN CONSTANT THIS AFTERNOON. RAIN CHANCES FOR THE FLORIDA KEYS  
TODAY WILL REMAIN WELL ABOVE NORMAL FOR THIS TIME OF YEAR DUE TO  
THE EXTREMELY MOIST AND UNSTABLE AIR MASS IN PLACE.  
 

 
   
MARINE
 
 
A SMALL CRAFT ADVISORY IS IN EFFECT FOR THE COASTAL WATERS OF THE  
FLORIDA STRAITS THIS AFTERNOON DUE TO SUSTAINED EAST TO SOUTHEAST  
WINDS NEAR 20 KNOTS. A SMALL CRAFT ADVISORY WILL LIKELY BE  
REQUIRED FOR THE COASTAL WATERS OF THE FLORIDA STRAITS TONIGHT  
THROUGH TUESDAY. A SMALL CRAFT ADVISORY MAY BE REQUIRED FOR THE  
COASTAL WATERS OF THE GULF OF MEXICO AND HAWK CHANNEL TONIGHT  
THROUGH TUESDAY. A SMALL CRAFT ADVISORY MAY BE REQUIRED FOR THE  
COASTAL WATERS OF THE FLORIDA STRAITS TUESDAY NIGHT. NO ADVISORIES  
EXPECTED WEDNESDAY THROUGH AT LEAST THURSDAY. A SMALL CRAFT  
ADVISORY MAY BE REQUIRED FOR THE COASTAL WATERS OF THE GULF OF  
MEXICO AND ATLANTIC THURSDAY NIGHT.  
 

 
   
AVIATION
 
 
A SWATH OF HEAVY RAIN SHOWERS, WITH A FEW EMBEDDED THUNDERSTORMS,  
WILL IMPACT EYW FOR THE NEXT FEW HOURS. PREPARE FOR TEMPORARY  
PERIODS OF IFR VIS, MVFR CIGS, AND CONVECTIVE WIND GUSTS OF 20 TO  
25 KNOTS. ALTHOUGH A FEW PASSING SHOWERS MAY BRUSH NEAR MTH,  
DIRECT FLIGHT IMPACTS ARE NOT ADVERTISED AT THIS TIME.  
 

 
   
CLIMATE
 
 
ON THIS DATE IN FLORIDA KEYS WEATHER HISTORY, IN 2006, THE LOW  
TEMPERATURE AT KEY WEST INTERNATIONAL AIRPORT WAS 67 DEGREES. THIS  
SET THE DAILY RECORD FOR MINIMUM TEMPERATURE MEASURED IN KEY WEST  
ON MAY 20TH. TEMPERATURE RECORDS AT KEY WEST DATE BACK TO 1872.  
 

 
   
KEY WATCHES/WARNINGS/ADVISORIES
 
 
FL...NONE.  
GM...SMALL CRAFT ADVISORY FOR GMZ052>055-072>075.  
 

 
 

 
 
PUBLIC/MARINE/FIRE...BS  
AVIATION/NOWCASTS....CLR  
DATA COLLECTION......CLR  
 
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