054
FXCA20 KWBC 231303
PMDCA
TROPICAL DISCUSSION - INTERNATIONAL DESKS
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
903 AM EDT MON OCT 23 2023
PRELIMINARY DISCUSSION FOR PUERTO RICO AND THE USVI OCT 23/12UTC:
ON MONDAY...HURRICANE TAMMY IS LOCATED TO THE NORTH OF PUERTO RICO
AROUND 21.4N AND 64.0W AT 0900 UTC. RAIN BANDS ASSOCIATED WITH THE
SYSTEM ARE EXPECTED TO BRING CONVECTION OVER THE ISLANDS AND
AMOUNTS BETWEEN 1-2 INCHES ARE EXPECTED ALONG THE CORDILLERA
CENTRAL AND IN THE NORTHEAST PORTION OF PUERTO RICO. ON TUESDAY
AND ONWARD...TAMMY IS EXPECTED TO CONTINUE MOVING NORTHWARD. A
FRONTAL SYSTEM CURRENTLY LOCATED OVER THE CENTRAL ATLANTIC...INTO
THE CENTRAL BAHAMAS AND NORTHERN CUBA...WILL PROPAGATE SOUTHWARD
AND IS FORECAST TO INTERACT WITH TAMMY. RESIDUAL MOISTURE FROM
TAMMY AND WINDS FROM THE NORTH WILL FAVOR MOISTURE CONVERGENCE
OVER PUERTO RICO AND THE VIRGIN ISLANDS FROM TUESDAY TO THURSDAY.
ADDITIONALLY...DEEP TROUGH IN THE UPPER LEVELS LOCATED TO THE WEST
OF THE ISLANDS...AS WELL AS A PREFRONTAL TROUGH OR POTENTIAL
PREFRONTAL SHEAR LINE ASSOCIATED WITH THE APPROACHING FRONT FROM
THE NORTH IS EXPECTED OVER THE ISLANDS BY FRIDAY. LARGE VALUES OF
PRECIPITABLE WATER ARE EXPECTED THROUGHOUT THE WEEK.
ON TUESDAY...IT IS FORECAST TO BE THE DAY WITH THE LEAST AMOUNT OF
PRECIPITATION...0.5-0.75 INCHES IN THE EASTERN PORTION OF PUERTO
RICO AND THE VIRGIN ISLANDS...WHILE ELSEWHERE...VALUES COULD
REMAIN BELOW 0.5 INCHES. ON WEDNESDAY AND THURSDAY...THE NORTH
SECTOR OF THE ISLAND CAN EXPECT VALUES BETWEEN 0.75-1.25 INCHES
AND LESS THAN 0.5 INCHES ELSEWHERE. ON FRIDAY...THE EASTERN
PORTION OF PUERTO RICO AND THE VIRGIN ISLANDS COULD EXPECT AMOUNTS
0.5-0.8 INCHES...AND LOWER AMOUNTS TO THE WEST.
ACOSTA...WPC (USA)
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