Area Forecast Discussion
Issued by NWS Pago Pago

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000
FXZS60 NSTU 040040
AFDPPG

AREA FORECAST DISCUSSION FOR AMERICAN SAMOA AND INDEPENDENT SAMOA
NATIONAL WEATHER SERVICE PAGO PAGO AS
140 PM SST MON AUG 3 2015

.SHORT TERM...
.TONIGHT THROUGH WEDNESDAY NIGHT...A PROMINENT TRADE-WIND REGIME
WILL PROVIDE MODERATE TO FRESH TRADES AND MINIMAL SHOWERS ACROSS
THE AREA DURING THE NEXT COUPLE DAYS. RECENT UPPER-LEVEL DATA FROM
THIS AFTERNOON/S RAOB SUGGEST DRIER AIR ALOFT AS THE SHOWALTER
INDEX LANDED AT A SEVEN INDICE TO INDICATE STABILITY ALOFT...WHILE
WIND SPEED IN THE LOWER 20S WERE DISPLAYED ON THE RAOB WIND
PROFILE UP TO 850MB OR NEAR FIVE-THOUSAND FT. A HIGH PRESSURE
CENTERED OVER SEVEN-HUNDRED NAUTICAL MILES SOUTH OF SAMOA IS
EXPECTED TO DISSIPATE TUESDAY AFTERNOON WHILE ANOTHER STRONG HIGH
PRESSURE WELL SOUTHEAST OF THE REGION WILL CONTINUE TO ENHANCE
THE TRADE-WIND FLOW THROUGH WEDNESDAY NIGHT. AS A RESULT...ANTICIPATE
COOLER TEMPERATURES AND ISOLATED TO SCATTERED SHOWERS OVER THE
REGION.

.LONG TERM...
.THURSDAY THROUGH MONDAY...A DEVELOPING SURFACE TROUGH TO THE
NORTHWEST OF SAVAII IS TRACKED TO MOVE OVER THE SAMOAN ISLANDS
STARTING FRIDAY MORNING. THIS WEATHER PHENOMENON WILL SWEEP
NUMEROUS TO FREQUENT SHOWERS AND POSSIBLE TSTMS THROUGH SATURDAY
EVENING. FOR NOW...WILL MONITOR THIS SITUATION BEFORE MAKING NEW
UPDATES. WILL KEEP THE PREV FCST THE SAME WHILE EXPECTING ONLY
ISOLATED SHOWERS THROUGH THE LONG-TERM FCST PERIOD.

&&

.MARINE...LARGE TRADE-WIND GENERATED SEAS AND SWELLS OF 12 FEET
WILL PRODUCE DANGEROUS SURFS UP TO 16 FEET ALONG THE EAST AND
SOUTH FACING REEFS UNTIL THURSDAY.

&&

.PPG WATCHES/WARNINGS/ADVISORIES...
.A HIGH SURF WARNING FOR EAST AND SOUTH FACING REEFS UNTIL THURSDAY.
.A WIND ADVISORY UNTIL 3 PM SST MONDAY.
.A SMALL CRAFT ADVISORY.

&&

$$

BAQUI











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