550  
FXUS62 KKEY 191517  
AFDKEY  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE KEY WEST FL  
1017 AM EST SUN JAN 19 2020  
   
DISCUSSION
 
 
MOSTLY SUNNY SKIES WERE OBSERVED OVER MOST OF THE FLORIDA KEYS  
SAVE BOUGHTS OF STRATOCUMULUS OVER PORTIONS OF THE LOWER KEYS,  
AIDED BY A WEAK WARM ADVECTION PATTERN OCCASIONALLY SATURATING THE  
LOWER TROPOSPHERE BENEATH A 4.5C TEMPERATURE INVERSION AT 9000 FT.  
TEMPERATURES WERE A BIT A WARMER THAN SAME TIME YESTERDAY,  
ENTERING THE UPPER 70S WITH DEWPOINTS IN THE 65-68F RANGE. WINDS  
HAVE GRADUALLY BECOME SOUTHEAST THIS MORNING WITH SPEEDS 5 TO 10  
MPH OVER THE ISLANDS, AND NEAR OR A BIT ABOVE 10 KNOTS ALONG THE  
REEF.  
 
FOR THE REMAINDER OF THE AFTERNOON, TRAPPED MOISTURE BENEATH THE  
INVERSION FROM SHALLOW BUOYANCY OVER THE STRAITS WILL BE WEAKLY  
FOCUSED ALONG THE CONFLUENT ZONE NORTH OF CUBA, AND GRADUALLY  
ERODING INTO THE AFTERNOON. AN EARLIER PERHAPS PESSIMISTIC  
PUBLIC FORECAST UPDATE WAS MADE TO ACCOUNT FOR BOUGHTS OF  
CLOUDINESS ALTHOUGH MEASUREABLE RAIN CHANCES REMAIN GENERALLY 10  
PERCENT OR LESS FOR THE REST OF TODAY.  
 

 
   
MARINE
 
 
NO WATCHES, WARNINGS OR ADVISORIES ARE CURRENTLY IN EFFECT FOR THE  
FLORIDA KEYS COASTAL WATERS. SOUTHEAST WINDS WILL GRADUALLY BECOME  
SOUTH AND DECREASE FURTHER INTO THIS EVENING. HOWEVER, A COLD  
FRONT EXPECTED TO PASS THROUGH THE KEYS DURING THE DAY MONDAY WILL  
BRING STRONG NORTHERLY BREEZES, WHICH WILL LAST THROUGH TUESDAY  
AND WEDNESDAY. AN ADDTIONAL FRESHENING OF EAST BREEZES MAY OCCUR  
LATER THURSDAY AS STRONG RIDGING BUILDS SOUTHEAST ACROSS VIRGINIA  
AND THE WESTERN ATLANTIC.  
 

 
   
AVIATION
 
 
VFR CONDITIONS ARE EXPECTED TO PREVAIL AT THE KEY WEST AND MARATHON  
TERMINALS THROUGH TONIGHT. LATEST RADAR IMAGES SHOW A FEW SHOWERS  
SOUTH OF THE LOWER KEYS THAT MAY BRING LIGHT PRECIPITATION TO THE  
KEY WEST TERMINAL LATE MORNING INTO EARLY AFTERNOON. WINDS SE NEAR  
10 KNOTS, DECREASING TO NEAR 5 KNOTS TONIGHT. A COLD FRONT WILL MOVE  
ACROSS THE ISLAND CHAIN TOMORROW MORNING, CAUSING WINDS TO BECOME  
MORE NORTHERLY. A FEW SHOWERS ARE LIKELY ALONG THE FRONTAL  
BOUNDARY.  
 

 
   
CLIMATE
 
 
ON THIS DATE IN 1997, THE DAILY RECORD LOW TEMPERATURE OF 48  
DEGREES WAS LAST RECORDED IN KEY WEST. TEMPERATURE RECORDS DATE  
BACK TO 1872.  
 

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

 
 

 
 
PUBLIC/MARINE/FIRE...JR  
AVIATION/NOWCASTS....SDR  
DATA COLLECTION......NB  
 
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