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 191819
AFDSJU

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
219 PM AST FRI DEC 19 2014

.SYNOPSIS...MID TO UPPER LEVEL RIDGE WILL GRADUALLY BUILD OVER THE
REGION DURING THE NEXT SEVERAL DAYS. SURFACE HIGH PRESSURE WILL
BUILD OVER THE REGION DURING THE NEXT FEW DAYS...MAINTAINING A EAST
NORTHEAST LOW LEVEL WIND FLOW OVER THE REGION.

&&

.DISCUSSION...DOPPLER WEATHER RADAR DETECTED ONLY LIGHT ISOLATED
SHOWERS MOVING SOUTHWESTWARD MOSTLY OVER THE SURROUNDING COASTAL
WATERS. LIMITED SHOWER ACTIVITY WAS DETECTED OVER LAND AREAS SO FAR
THIS AFTERNOON. HOWEVER UNDER AN EAST NORTHEAST LOW LEVEL WIND FLOW
SOME SHOWERS DEVELOPMENT ARE NOT RULE OUT OVER SOUTHERN HALF OF
PUERTO RICO DURING THE REST OF THE AFTERNOON HOURS. A MID TO UPPER
LEVEL RIDGE IS EXPECTED TO BUILD OVER THE REGION FOR THE NEXT
SEVERAL DAYS. THIS FEATURE WILL INDUCE A GENERALLY FAIR WEATHER
PATTERN ACROSS THE REGION UNTIL AT LEAST THE CHRISTMAS EVE HOLIDAY.
THEREFORE A GENERALLY DRY AND PLEASANT WEATHER PATTERN IS IN STORE
FOR THE REGION FOR THE NEXT SEVERAL DAYS INTERRUPTED ONLY WITH A
SLIGHT INCREASE IN MOISTURE BY SUNDAY. HOWEVER...PATCHES OF LOW
LEVEL MOISTURE EMBEDDED IN THE TRADES WILL CONTINUE TO PROMOTE THE
DEVELOPMENT OF LIGHT ISOLATED SHOWERS OVER EASTERN PUERTO RICO AND
THE U.S. VIRGIN ISLANDS DURING THE NIGHT AND EARLY MORNING HOURS.
NOT SIGNIFICANT WEATHER FEATURE IS EXPECTED TO AFFECT THE FORECAST
AREA UNTIL AT LEAST THE CHRISTMAS EVE AND POSSIBLY BEYOND.

&&

.AVIATION...MOSTLY VFR CONDITIONS EXPECTED AT ALL LOCAL FLYING
TERMINALS THROUGH THE FORECAST PERIOD. LATEST TJSJ SOUNDING
INDICATED AN EAST TO EAST NORTHEAST WIND FLOW UP TO 20 KNOTS ALL THE
WAY FROM THE SURFACE TO 20K FEET...BECOMING NORTHERLY AND STRONGER
FROM 20-40K FEET AND EVEN STRONGER FROM THE NORTHWEST ABOVE
40K FEET

&&

.MARINE...SEAS UP TO 5 FEET AND WINDS UP TO 18 KNOTS ARE EXPECTED.

&&

.PRELIMINARY POINT TEMPS/POPS...
SJU  70  84  71  83 /   0  20  20  20
STT  73  86  74  86 /  10  20  20  20

&&

.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.