Flash Flood Warning 147, NWS JSJ

232 
WGCA72 TJSJ 151456
FFSSJU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN JUAN PR
1056 AM AST WED DEC 15 2010

PRC119-151504-
/O.EXP.TJSJ.FF.W.0147.000000T0000Z-101215T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
RIO GRANDE PR-
1056 AM AST WED DEC 15 2010

...THE FLASH FLOOD WARNING WILL EXPIRE AT 1100 AM AST FOR RIO GRANDE
MUNICIPALITY...

DOPPLER RADAR INDICATED THAT THE HEAVY RAIN WHICH AFFECTED THIS AREA 
HAS WEAKEN. IN ADDITION...LATEST USGS READINGS INDICATE THAT THE RIO 
ESPIRITU SANTO HAS CRESTED AND IS NOW FALLING. THEREFORE...THE FLASH 
FLOOD WARNING HAS BEEN ALLOWED TO EXPIRED.

LAT...LON 1842 6582 1843 6578 1829 6580 1829 6584

$$

CASTRO

ADDITIONAL INFORMATION CAN BE FOUND AT /USE LOWER CASE LETTERS/:
     HTTP://WWW.WEATHER.GOV/SANJUAN

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
539 AM AST WED DEC 15 2010

.SYNOPSIS...MID TO UPPER LEVEL LONGWAVE TROUGH IS SPREAD ACROSS
THE WEST AND SOUTHWEST ATLANTIC TO JUST NORTH OF THE AREA...WITH
SHORTWAVE VORTICES PROPAGATING ALONG THE BASE OF THE TROUGH AND
JUST NORTH OF THE LOCAL ISLANDS. GFS MODEL GUIDANCE SUGGESTS THAT
SOME OF THIS MID TO UPPER LEVEL DYNAMICS WILL MOVE CLOSE ENOUGH
THE REGION TODAY TO PROVIDE ENOUGH SUPPORT FOR INCREASED CONVECTION
ACROSS THE ISLANDS AND SURROUNDING WATERS. IN ADDITION...OLD
FRONTAL BOUNDARY/SHEAR LINE WILL CONTINUE SINK SOUTH ACROSS THE
FORECAST AREA THROUGH THE MORNING HOURS...THEN SPREAD ASSOCIATED
CLOUDINESS AND SHOWERS ACTIVITY OVER PUERTO RICO AND THE ADJACENT
ISLANDS. MEANWHILE SLOWLY WEAKENING COLD FRONT WHICH IS HELPING TO
PUSH SHEAR LINE FURTHER SOUTHWARDS...EXTENDED SOUTHWEST ACROSS THE
DOMINICAN REPUBLIC THIS MORNING...AS SURFACE HIGH PRESSURE WILL
BUILD ACROSS THE SOUTHWEST ATLANTIC.

&&

.DISCUSSION...THE LIGHT NORTHERLY WINDS CONVERGING WITH THE LAND
BREEZE ALONG THE NORTHERN COAST OF PUERTO RICO...BROUGHT AND AREAS
OF MODERATE TO LOCALLY HEAVY RAINFALL ACROSS MUCH OF THE NORTH
COASTAL MUNICIPALITIES DURING THE EARLY MORNING. EXPECT CONTINUED
SHOWER DEVELOPMENT ALONG THE NORTHERN COAST OF PUERTO RICO AND THE
WATERS JUST TO THE NORTH OF PUERTO RICO THROUGH THE REST OF THE
MORNING HOURS. LATEST GFS MODEL GUIDANCE SUGGESTS BEST LOW LEVEL
MOISTURE AND DYNAMICS ASSOCIATED WITH THE SINKING SHEAR LINE...AND
WEAKENING COLD FRONT JUST NORTHWEST OF AREA...WILL EVENTUALLY MOVE
JUST SOUTH OF PUERTO RICO TO NEAR THE VIRGIN ISLANDS LATER THIS
EVENING THROUGH THURSDAY MORNING. IN ADDITION MODEL GUIDANCE NOW
IN AGREEMENT AND SUGGEST MID TO LEVEL PERTURBATIONS WILL CONTINUE
TO PASS SUFFICIENTLY CLOSE TO SUPPORT INCREASED CONVECTION ACROSS
PUERTO RICO AND PARTS OF THE VIRGIN ISLANDS AT LEAST THROUGH
THURSDAY. INHERITED FORECAST TREND THEREFORE LOOKS GOOD FOR NOW
WITH CHANCES FOR RAIN LIKELY OVER THIS TIME PERIOD. EXPECT INCREASING
NORTHEAST TRADES BY FRIDAY ACROSS TE NORTHEAST CARIBBEAN AS SURFACE
HIGH BUILDS NORTH OF THE AREA...AND ASSOCIATED MOISTURE BAND ALONG
THE DISSIPATION FRONTAL BOUNDARY SINKS FURTHER SOUTH OF THE ISLANDS
BY LATE FRIDAY. WITH THAT EXPECT STABLE AIR ADVECTION WITH THE MODERATE
NORTHEASTERLY TRADES AND COOLER SURFACE TEMPERATURES INTO THE WEEKEND.

&&

.AVIATION...MID TO UPPER LEVEL CLOUDINESS WILL CONTINUE TO MOVE
ACROSS THE LOCAL FLYING AREA TODAY. MOSTLY VFR CONDITIONS ARE
EXPECTED AT ALL LOCAL TAF SITES THROUGH 15/14Z. THEREAFTER...
CLOUDINESS ASSOCIATED WITH AN APPROACHING FRONTAL BOUNDARY WILL
GRADUALLY MOVE ACROSS THE LOCAL ISLANDS. TEMPO MVFR CONDS AT TJBQ
AND TJMZ WITH MOUNTAIN OBSCURATIONS INCREASING OVER ALL OF PR AFT
15/16Z. NO FLYING HAZARDS ANTICIPATED EN ROUTE TO OR VCTY OF USVI
TAF SITES.

&&

.PRELIMINARY POINT TEMPS/POPS...
SJU  82  72  81  73 /  60  60  60  30
STT  84  72  84  74 /  40  50  50  40

&&

.SJU WATCHES/WARNINGS/ADVISORIES...

PR...HIGH SURF ADVISORY UNTIL 10 AM AST THURSDAY FOR CULEBRA-
     MAYAGUEZ AND VICINITY-NORTH CENTRAL-NORTHEAST- NORTHWEST- SAN
     JUAN AND VICINITY.

     SCA AMZ710-712-715-722-741-742-745.

VI...HIGH SURF ADVISORY AT LEAST UNTIL 10 AM AST THURSDAY FOR ST.
     THOMAS/ST. JOHN/ADJACENT ISLANDS.

     SCA AMZ710-712-715-722.

&&

72/09

HAZARDOUS WEATHER OUTLOOK FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS
NATIONAL WEATHER SERVICE SAN JUAN PR
523 AM AST WED DEC 15 2010

AMZ710>745-PRZ001>013-160930-
SAN JUAN AND VICINITY-NORTHEAST-SOUTHEAST-EASTERN INTERIOR-
NORTH CENTRAL-CENTRAL INTERIOR-PONCE AND VICINITY-NORTHWEST-
WESTERN INTERIOR-MAYAGUEZ AND VICINITY-SOUTHWEST-CULEBRA-VIEQUES-
THE NEARSHORE AND OFF SHORE ATLANTIC AND CARIBBEAN COASTAL WATERS-
523 AM AST WED DEC 15 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT
ATLANTIC COASTAL WATERS.

.DAY ONE...TODAY AND TONIGHT

A WEAKENING FRONTAL BOUNDARY JUST ACROSS THE REGION TODAY...WILL
CONTINUE TO INDUCE THE DEVELOPMENT OF SHOWERS AND A FEW
THUNDERSTORMS ACROSS PUERTO RICO TODAY AND TONIGHT. A COMBINATION
OF LONG PERIOD NORTHWEST SWELLS...AND MODERATE NORTHEAST
SWELLS WILL CONTINUE TO CREATE HAZARDOUS SURF CONDITIONS ALONG THE
NORTH FACING COASTLINES...WITH A MODERATE TO HIGH RISK OF RIP
CURRENTS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

A COMBINATION OF LONG PERIOD NORTHWEST SWELLS...AND MODERATE NORTHEAST
SWELLS WILL CREATE HAZARDOUS SURF CONDITIONS ALONG THE NORTH FACING
COASTLINES...WITH A MODERATE TO HIGH RISK OF RIP CURRENTS.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION WILL NOT BE NEEDED AT THIS TIME.

AMZ715-725-VIZ001-002-160930-
ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX-
NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS-
523 AM AST WED DEC 15 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS AND THE
ADJACENT COASTAL WATERS.

.DAY ONE...TODAY AND TONIGHT
A WEAKENING FRONTAL BOUNDARY JUST ACROSS THE REGION TODAY...WILL
CONTINUE TO INDUCE THE DEVELOPMENT OF SHOWERS AND A FEW
THUNDERSTORMS ACROSS THE LOCAL ISLANDS TODAY AND TONIGHT. A
COMBINATION OF LONG PERIOD NORTHWEST SWELLS...AND MODERATE
NORTHEAST SWELLS WILL CONTINUE TO CREATE HAZARDOUS SURF CONDITIONS
ALONG THE NORTH FACING COASTLINES...WITH A MODERATE TO HIGH RISK
OF RIP CURRENTS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

A COMBINATION OF LONG PERIOD NORTHWEST SWELLS...AND MODERATE NORTHEAST
SWELLS WILL CREATE HAZARDOUS SURF CONDITIONS ALONG THE NORTH FACING
COASTLINES...WITH A MODERATE TO HIGH RISK OF RIP CURRENTS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED AT THIS TIME