Area Forecast Discussion
Issued by NWS San Juan, PR

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000
FXCA62 TJSJ 300827 CCA
AFDSJU

AREA FORECAST DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE SAN JUAN PR
426 AM AST SAT AUG 30 2014

.SYNOPSIS...UPPER LEVEL RIDGE WILL CONTINUE TO BUILD OVER THE LOCAL
REGION AND REMAINS AS THE WEATHER FEATURE ACROSS THE LOCAL ISLANDS
FOR THE NEXT FEW DAYS AS TUTT LOW...NORTH OF HISPANIOLA...MOVES
WESTWARD. A SURFACE TROUGH WILL CONTINUE TO MOVE ACROSS THE REGION
TODAY. A WEAK TROPICAL ALONG 55 WEST THIS MORNING...IS EXPECTED TO
REACH THE REGION BY WEDNESDAY.

&&

.DISCUSSION...DOPPLER WEATHER RADAR DETECTED ISOLATED TO SCATTERED
SHOWERS ACROSS THE REGION THIS MORNING. SOME OF THESE SHOWERS
AFFECTED VIEQUES...CULEBRA...THE USVI AND EASTERN SECTIONS OF PUERTO
RICO FROM TIME TO TIME OVERNIGHT AND EARLY THIS MORNING. THIS
ACTIVITY WAS ASSOCIATED WITH A SURFACE TROUGH MOVING ACROSS THE
REGION TODAY...ENHANCED BY AN UPPER LOW JUST TO THE NORTH OF
HISPANIOLA. FOR THIS AFTERNOON...THE AVAILABLE MOISTURE ACROSS THE
REGION WILL COMBINE WITH DIURNAL HEATING AND LOCAL OROGRAPHIC
EFFECTS TO INDUCE THE DEVELOPMENT OF SHOWERS AND THUNDERSTORMS.
UNDER THE PREVAILING EASTERLY WIND FLOW...MOST AFTERNOON ACTIVITY
WILL BE FOCUSED ACROSS THE CORDILLERA AND WEST PUERTO RICO.

RIDGE ALOFT WILL CONTINUE TO BUILD OVER THE LOCAL ISLANDS FOR THE
FEW DAYS...AS THE UPPER LOW JUST NORTH OF HISPANIOLA...MOVES FURTHER
WEST AND AWAY FROM THE FORECAST AREA. AS THE UPPER RIDGE BUILDS OVER
THE REGION...PWAT VALUES ARE EXPECTED TO DECREASE FOR THE NEXT
SEVERAL DAYS. HOWEVER...SHOWERS AND A FEW THUNDERSTORMS WILL DEVELOP
EACH DAY OVER WESTERN AND INTERIOR SECTIONS OF PUERTO RICO. A WEAK
TROPICAL WAVE...ALONG 55 WEST THIS MORNING WILL CONTINUE TO MOVE
WESTWARD APPROACHING THE LOCAL ISLANDS ON WEDNESDAY...INDUCING A
MODEST INCREASE IN CLOUDINESS...SHOWERS AND THUNDERSTORMS OVER THE
LOCAL ISLANDS.

&&

.AVIATION...PASSING TRADE WIND -SHRA/SHRA WILL AFFECT THE COASTAL
WATERS OF THE LOCAL ISLANDS AND EN ROUTE BTW PR AND NRN LEEWARD TIL
30/14Z. SFC WINDS LGT AND VRB AT LCL TAF SITES TIL AT LEAST
30/14Z...BCMG E-NE 10-15 KTS THEREAFTER WITH SEA BREEZE VARIATIONS.
SCT-NMRS SHRA/ISOLD TSRA FCST ACROSS CENTRAL AND W PR AFTER
30/17Z...W/ISOLD TSRA VCTY TJMZ AND TJBQ PSBL. L/LVL WNDS FM E-NE
5-15 KTS UP FL150 BCMG FM SW AT 10-20 KTS UP TO FL350.

&&

.MARINE...SMALL CRAFT SHOULD EXERCISE CAUTION ACROSS THE ATLANTIC
WATERS. ELSEWHERE ACROSS THE REGION A GENERALLY QUIET MARINE
CONDITIONS ARE EXPECTED.

&&

.PRELIMINARY POINT TEMPS/POPS...
SJU  88  76  88  78 /  50  40  30  40
STT  88  78  89  79 /  50  50  30  40

&&

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

$$

09/72





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