Area Forecast Discussion
Issued by NWS San Juan, PR

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
000
FXCA62 TJSJ 181839
AFDSJU

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
239 PM AST THU DEC 18 2014

.SYNOPSIS...A WEAK UPPER LEVEL TROUGH WILL MOVE THROUGH THE AREA
THIS EVENING. MID-UPPER LEVEL RIDGE WILL BUILD OVER THE REGION
FRIDAY THROUGH THE NEXT SEVERAL DAYS.

&&

.DISCUSSION...DOPPLER WEATHER RADAR DETECTED ISOLATED TO SCATTERED
SHOWERS MOVING SOUTHWESTWARD FROM THE ATLANTIC WATERS OVER THE
NORTHERN AND CENTRAL SECTIONS OF PUERTO RICO AS WELL AS ACROSS
VIEQUES...CULEBRA AND THE U.S. VIRGIN ISLANDS THIS AFTERNOON.
HOWEVER...THE TOTAL RAINFALL AMOUNTS ASSOCIATED WITH THIS ACTIVITY
WERE GENERALLY MINIMAL. A WEAK UPPER LEVEL TROUGH IS EXPECTED TO
CROSS THE REGION THIS EVENING...INDUCING A SLIGHT INCREASE IN
MOISTURE ACROSS THE LOCAL ISLANDS...BUT MOSTLY ACROSS THE CARIBBEAN
WATERS. A MID TO UPPER LEVEL RIDGE IS EXPECTED TO BUILD OVER THE
REGION FRIDAY...PRODUCING A GENERALLY FAIR WEATHER PATTERN ACROSS
THE REGION FOR THE NEXT SEVERAL DAYS. HOWEVER...PATCHES OF LOW
LEVEL MOISTURE EMBEDDED IN THE TRADES WILL CONTINUE TO PROMOTE THE
DEVELOPMENT OF ISOLATED SHOWERS OVER EASTERN PUERTO RICO AND THE
U.S. VIRGIN ISLANDS DURING THE NIGHT AND EARLY MORNING HOURS. NOT
SIGNIFICANT WEATHER EVENT IS EXPECTED TO AFFECT THE FORECAST AREA
UNTIL AT LEAST THE CHRISTMAS DAY.

&&

.AVIATION...MOSTLY VFR CONDITIONS ARE EXPECTED ACROSS THE LOCAL
FLYING AREA TONIGHT WITH ONLY BRIEF PERIODS OF PASSING SHOWERS.
LATEST TJSJ SOUNDING INDICATED A NORTHEAST WIND FLOW UP TO 15
KNOTS ALL THE WAY FROM THE SURFACE TO 20K FEET...BECOMING
WESTERLY AND STRONGER ABOVE 20K FEET.

&&

.MARINE...SEAS UP TO 5 FEET AND WINDS UP TO 17 KNOTS ARE EXPECTED.

&&

.PRELIMINARY POINT TEMPS/POPS...
SJU  73  82  70  84 /  20  10  10  10
STT  74  86  75  86 /  20  10  10  10

&&

.SJU WATCHES/WARNINGS/ADVISORIES...
PR...NONE.
VI...NONE.
COASTAL WATERS...NONE.
&&

$$

71/72




USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.