#17495 Postby cycloneye » Tue Oct 20, 2015 5:00 am
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
445 AM AST TUE OCT 20 2015
.SYNOPSIS...TUTT WILL REMAIN EAST/SOUTHEAST OF THE FORECAST AREA
FOR THE NEXT FEW DAYS. FRONTAL BOUNDARY WILL LINGER OVER THE
ATLANTIC WATERS BETWEEN TWO SFC HIGHS DURING THE NEXT FEW DAYS.
UPPER RIDGE OVER THE CARIBBEAN BASIN WILL GRADUALLY ERODE AS UPPER
TROUGH AMPLIFIES FROM THE WESTERN ATLANTIC INTO THE CENTRAL
CARIBBEAN BY MIDWEEK. LIGHT EAST TO SOUTHERLY LOW LEVEL WIND FLOW
WILL CONTINUE THROUGH THE FORECAST PERIOD.
&&
.DISCUSSION...SHOWERS REMAINED MAINLY OVER THE ATLANTIC AND
CARIBBEAN WATERS AS THEY SLOWLY DRIFTED NORTHWEST...WITH ISOLATED
THUNDERSTORMS DEVELOPING OVER THE OFFSHORE WATERS. A FEW OF THESE
SHOWERS ARE EXPECTED TO REACH SECTIONS OF THE USVI AND EASTERN PR
DURING THE EARLY MORNING HOURS. THEN...SLOW MOVING THUNDERSTORMS
ARE FORECAST TO DEVELOP ONCE AGAIN OVER THE MOUNTAIN RANGES OF
PR DURING THE AFTERNOON. THEY WILL REMAIN OR MOVE SLOW OVER THE
SAME AREAS...CAUSING PERIODS OF HEAVY RAINFALL...FREQUENT
LIGHTNING...AND FLOODING IN SMALL STREAMS AND URBAN
AREAS. ALSO...AS SOILS ARE ALREADY SATURATED BY PREVIOUS DAYS
RAINFALL...MUDSLIDES ARE POSSIBLE WITH THE HEAVIEST SHOWERS IN
AREAS OF STEEP TERRAIN.
NOT MUCH CHANGE IN THE FORECAST FOR THE REST OF THE WORK
WEEK...AS SIMILAR DIURNAL AFTERNOON CONVECTION IS EXPECTED TO
DEVELOP EACH DAY AS LIGHT STEERING WINDS WILL REMAIN IN PLACE. BY
THE END OF THE WORK WEEK...AN UPPER TROUGH WITH ASSOCIATED LOW ARE
FORECAST TO REMAIN NORTH OF THE HISPANIOLA. THIS WILL TURN WINDS
MORE FROM THE SOUTH TO SOUTHWEST AND WILL BRING MORE TROPICAL
MOISTURE INTO THE AREA. THIS DEEP TROPICAL MOISTURE IN COMBINATION
WITH FAVORABLE UPPER LEVEL DYNAMICS WILL RESULT IN A VERY ACTIVE
WEATHER PATTERN BY EARLY NEXT WEEK.
&&
.AVIATION...MOSTLY VFR CONDS THRU THE FCST PRD. SFC WND LGT/VRB TO
CALM TIL 20/13Z...BCMG ESE AND GRADUALLY INCR TO 5-10 KTS WITH
SEABREEZE VARIATIONS. LCL AND DIURNAL EFFECTS WILL LEAD TO AFTN
CONVTN OVR PARTS OF W AND NRN HALF OF PR ALONG CORDILLERA
CENTRAL...AND VCTY TJSJ...TJPS...TJBQ...AND TJMZ FM 20/18Z-20/22Z
WITH ISOLD TSRA/BRIEF MVFR/IFR PSBL.
&&
.MARINE...A MODERATE NNW SWELL WILL BEGIN TO AFFECT OUR LOCAL
ATLANTIC WATERS ON WEDNESDAY MORNING. THESE SWELLS WILL GENERATE
DANGEROUS MARINE CONDITIONS ALONG THE NORTHERN EXPOSED BEACHES OF
PUERTO RICO. STRONG RIP CURRENTS EXPECTED ALONG THE ATLANTIC
COASTLINE OF ALL ISLANDS.
&&
.PRELIMINARY POINT TEMPS/POPS...
SJU 88 77 89 78 / 20 20 40 20
STT 89 78 88 79 / 30 20 20 30
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