Post by cycloneye on Feb 21, 2015 4:17:34 GMT -6
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
552 AM AST SAT FEB 21 2015
.SYNOPSIS...A MID TO UPPER LEVEL RIDGE WILL CONTINUE TO ESTABLISH
ACROSS THE LOCAL ISLANDS TODAY...AND HOLD THROUGH EARLY NEXT WEEK.
TRADE WINDS WILL STRENGTHEN TODAY INTO SUNDAY MORNING AS HIGH
PRESSURE BUILDS ACROSS THE WESTERN ATLANTIC.
&&
.DISCUSSION...VARIABLY CLOUDY SKIES PREVAILED ACROSS THE LOCAL
ISLANDS OVERNIGHT WITH FREQUENT PASSING SHOWERS OBSERVED OVER
THE USVI AND E PR. WINDS WERE FROM THE EAST AT 10 MPH OR LESS
WITH COASTAL TEMPERATURES IN THE LOW TO MID 70S.
A LOW LEVEL DISTURBANCE/INDUCED SURFACE TROUGH AND ASSOCIATED
MOISTURE WILL CONTINUE TO MOVE ACROSS THE AREA TODAY AND WILL
INTERACT WITH LOCAL EFFECT TO PRODUCE CLOUDINESS AND A FEW SHOWERS
WITH THUNDERSTORMS ACROSS PORTIONS OF THE LOCAL ISLANDS. UNDER
THE PREVAILING EASTERLY WIND FLOW...FREQUENT PASSING SHOWERS
STILL EXPECTED ACROSS THE USVI AND THE EASTERN THIRD OF PUERTO
RICO THIS MORNING AND EARLY IN THE AFTERNOON...FOLLOWED BY
SHOWERS WITH ISOLATED THUNDERSTORMS FOCUSED ACROSS W AND SW PR.
WEATHER CONDITIONS ARE EXPECTED TO IMPROVE LATER TODAY UNDER
RIDGE ALOFT/EROSION OF LOW LEVEL MOISTURE AND STRENGTHENING
TRADES. HOWEVER TRADE WIND SHOWERS ACROSS WINDWARD AREAS AND
LIMITED CONVECTION ACROSS W PR CANT BE RULED OUT SUN-TUE. AN
UPPER LEVEL DISTURBANCE WILL MOVE ACROSS THE AREA TUESDAY
NIGHT...INCREASING ONCE AGAIN THE CHANCE OF SHOWERS AND
THUNDERSTORMS ACROSS THE FORECAST AREA THRU WEDNESDAY. FAIR
WEATHER CONDITIONS WILL RETURN WEDNESDAY NIGHT THROUGH THE END
OF NEXT WEEK AS UPPER LEVEL RIDGE HOLDS ACROSS THE AREA WITH A
SHARP DECREASE IN AVAILABLE MOISTURE.
&&
.AVIATION...VCSH ACROSS MOST OF THE LOCAL TERMINALS IN THE MORNING
HOURS WITH TEMPO MVFR CONDS LIKELY FOR TIST/TISX/TJSJ AND POSSIBLY
TJBQ AS THE SHOWERS BRIEFLY AFFECT THE TERMINALS. AFTER 21/18Z MTN
OBSCURATIONS WILL DEVELOP ACROSS THE INTERIOR/WESTERN PR AND SOME
SHRA WITH ISOLD TSRA COULD DEVELOP IN/AROUND TJMZ. WINDS WILL BE
FROM THE EAST WITH SEA BREEZE VARIATIONS AT AROUND 15 KTS TODAY...
DECREASING IN SPEED AFTER 22/00Z.
&&
.MARINE...LONG PERIOD NORTHWEST SWELLS WILL ARRIVE AND SPREAD
ACROSS THE ATLANTIC WATERS TODAY. THIS WILL RESULT IN LARGE
BREAKING WAVE ACTION AND DANGEROUS RIP CURRENTS ALONG THE NORTH
FACING COASTS OF PUERTO RICO THIS AFTERNOON THROUGH AT LEAST LATE
TONIGHT. NORTHWEST SWELLS OF 7 FEET WITH PERIOD OF 12 TO 14
SECONDS WILL PRODUCE LARGE BREAKING WAVES BETWEEN 10 TO 13 FEET.
THEREFORE HIGH SURF ADV IN EFFECT FROM 2 PM AST THIS AFTERNOON
THRU MIDNIGHT AST.
&&
.PRELIMINARY POINT TEMPS/POPS...
SJU 86 75 86 75 / 70 30 30 40
STT 84 75 85 76 / 50 30 30 40
NATIONAL WEATHER SERVICE SAN JUAN PR
552 AM AST SAT FEB 21 2015
.SYNOPSIS...A MID TO UPPER LEVEL RIDGE WILL CONTINUE TO ESTABLISH
ACROSS THE LOCAL ISLANDS TODAY...AND HOLD THROUGH EARLY NEXT WEEK.
TRADE WINDS WILL STRENGTHEN TODAY INTO SUNDAY MORNING AS HIGH
PRESSURE BUILDS ACROSS THE WESTERN ATLANTIC.
&&
.DISCUSSION...VARIABLY CLOUDY SKIES PREVAILED ACROSS THE LOCAL
ISLANDS OVERNIGHT WITH FREQUENT PASSING SHOWERS OBSERVED OVER
THE USVI AND E PR. WINDS WERE FROM THE EAST AT 10 MPH OR LESS
WITH COASTAL TEMPERATURES IN THE LOW TO MID 70S.
A LOW LEVEL DISTURBANCE/INDUCED SURFACE TROUGH AND ASSOCIATED
MOISTURE WILL CONTINUE TO MOVE ACROSS THE AREA TODAY AND WILL
INTERACT WITH LOCAL EFFECT TO PRODUCE CLOUDINESS AND A FEW SHOWERS
WITH THUNDERSTORMS ACROSS PORTIONS OF THE LOCAL ISLANDS. UNDER
THE PREVAILING EASTERLY WIND FLOW...FREQUENT PASSING SHOWERS
STILL EXPECTED ACROSS THE USVI AND THE EASTERN THIRD OF PUERTO
RICO THIS MORNING AND EARLY IN THE AFTERNOON...FOLLOWED BY
SHOWERS WITH ISOLATED THUNDERSTORMS FOCUSED ACROSS W AND SW PR.
WEATHER CONDITIONS ARE EXPECTED TO IMPROVE LATER TODAY UNDER
RIDGE ALOFT/EROSION OF LOW LEVEL MOISTURE AND STRENGTHENING
TRADES. HOWEVER TRADE WIND SHOWERS ACROSS WINDWARD AREAS AND
LIMITED CONVECTION ACROSS W PR CANT BE RULED OUT SUN-TUE. AN
UPPER LEVEL DISTURBANCE WILL MOVE ACROSS THE AREA TUESDAY
NIGHT...INCREASING ONCE AGAIN THE CHANCE OF SHOWERS AND
THUNDERSTORMS ACROSS THE FORECAST AREA THRU WEDNESDAY. FAIR
WEATHER CONDITIONS WILL RETURN WEDNESDAY NIGHT THROUGH THE END
OF NEXT WEEK AS UPPER LEVEL RIDGE HOLDS ACROSS THE AREA WITH A
SHARP DECREASE IN AVAILABLE MOISTURE.
&&
.AVIATION...VCSH ACROSS MOST OF THE LOCAL TERMINALS IN THE MORNING
HOURS WITH TEMPO MVFR CONDS LIKELY FOR TIST/TISX/TJSJ AND POSSIBLY
TJBQ AS THE SHOWERS BRIEFLY AFFECT THE TERMINALS. AFTER 21/18Z MTN
OBSCURATIONS WILL DEVELOP ACROSS THE INTERIOR/WESTERN PR AND SOME
SHRA WITH ISOLD TSRA COULD DEVELOP IN/AROUND TJMZ. WINDS WILL BE
FROM THE EAST WITH SEA BREEZE VARIATIONS AT AROUND 15 KTS TODAY...
DECREASING IN SPEED AFTER 22/00Z.
&&
.MARINE...LONG PERIOD NORTHWEST SWELLS WILL ARRIVE AND SPREAD
ACROSS THE ATLANTIC WATERS TODAY. THIS WILL RESULT IN LARGE
BREAKING WAVE ACTION AND DANGEROUS RIP CURRENTS ALONG THE NORTH
FACING COASTS OF PUERTO RICO THIS AFTERNOON THROUGH AT LEAST LATE
TONIGHT. NORTHWEST SWELLS OF 7 FEET WITH PERIOD OF 12 TO 14
SECONDS WILL PRODUCE LARGE BREAKING WAVES BETWEEN 10 TO 13 FEET.
THEREFORE HIGH SURF ADV IN EFFECT FROM 2 PM AST THIS AFTERNOON
THRU MIDNIGHT AST.
&&
.PRELIMINARY POINT TEMPS/POPS...
SJU 86 75 86 75 / 70 30 30 40
STT 84 75 85 76 / 50 30 30 40