Area Forecast Discussion
Issued by NWS Pago Pago

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FXZS60 NSTU 290136
AFDPPG

AREA FORECAST DISCUSSION FOR AMERICAN SAMOA AND INDEPENDENT SAMOA
NATIONAL WEATHER SERVICE PAGO PAGO AS
236 PM SST WED SEP 28 2016

.SHORT TERM...
.TONIGHT THROUGH FRIDAY NIGHT...STRONG UPPER-LEVEL DIVERGENT WINDS COMBINED
WITH LOW-LEVEL CONVERGENCE WILL ENHANCE INCREASING CLOUDINESS AND ISOLATED
TSTMS OVER THE AREA. A LINE OF CLOUDS ASSOCIATED WITH A SURFACE TO MID-
LEVEL TROUGH WILL MOVE FROM EAST TO WEST TONIGHT...MEANWHILE A SURFACE
RIDGE TO THE SOUTH WILL MOVE SOUTHWARD AND AWAY FROM THE REGION.

A DEVELOPING AREA OF HIGH PRESSURE WELL SW WILL BUILD EASTWARD. THIS
WEATHER PHENOMENON WILL REINFORCE CLOUD REMNANTS FROM THE SOUTH TO
RE-ENTER THE AREA DURING THURSDAY NIGHT INTO FRIDAY. A LOT OF MOISTURE
AND POSSIBLE LOCALLY HEAVY RAINFALL ARE EXPECTED BEFORE FRIDAY AFTERNOON.
IF MODELS ARE CORRECT...SCATTERED TO NUMEROUS SHOWERS WILL SWEEP ACROSS
THE FCST ZONES DURING MOST OF THE SHORT-TERM FCST PERIOD. ALSO...MODERATE
EASTERLIES WITH HIGHER GUSTS WILL PERSIST THROUGH FRIDAY.

.LONG TERM...
.SATURDAY THROUGH WEDNESDAY...A SURFACE TROUGH EMBEDDED ALONG THE EASTERLY
FLOW WILL BRING SCATTERED TO NUMEROUS SHOWERS AND POSSIBLE TSTMS INTO
THE WEEKEND. A SURFACE HIGH PRESSURE CENTERED SW OF THE REGION WILL
WEAKEN THE AFOREMENTIONED TROUGH AS IT BUILDS EASTWARD DURING
TUESDAY. AS A RESULT...ANTICIPATE WET WEATHER CONDITIONS TO DISSIPATE
AT LEAST AROUND MONDAY NIGHT INTO TUESDAY.

&&

.MARINE...GENTLE TO MODERATE SEAS WILL PERSIST OVER THE NEXT SEVERAL
DAYS. THERE ARE NO SIGNIFICANT SWELLS EXPECTED THROUGH THE END OF
THE WEEK.

&&

.PPG WATCHES/WARNINGS/ADVISORIES...

NONE.

&&

$$

CB





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