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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