Flash Flood Warning 16, NWS JSJ

928 
WGCA72 TJSJ 240311
FFSSJU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN JUAN PR
1111 PM AST FRI APR 23 2010

PRC121-153-240320-
/O.EXP.TJSJ.FF.W.0016.000000T0000Z-100424T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SABANA GRANDE PR-YAUCO PR-
1111 PM AST FRI APR 23 2010

...THE FLASH FLOOD WARNING WILL EXPIRE AT 1115 PM AST FOR YAUCO AND
SABANA GRANDE MUNICIPALITIES...

DOPPLER RADAR INDICATED THAT THE HEAVY RAIN WHICH AFFECTED THIS AREA
HAD DISSIPATED OR MOVED AWAY. NO SIGNIFICANT ADDITIONAL RAINFALL IS
EXPECTED ACROSS THESE AREAS AT THIS TIME.

LAT...LON 1814 6686 1801 6687 1807 6691 1812 6692

$$

SNELL

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

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
312 PM AST FRI APR 23 2010

.SYNOPSIS...MID TO UPPER LEVEL DISTURBANCE WILL MOVE ACROSS OR
JUST NORTH OF THE LOCAL AREA LATE TONIGHT THROUGH THE FIRST PART
OF SATURDAY...BEFORE LIFTING SLOWLY OUT TO THE NORTHEAST LATER
SATURDAY AND SATURDAY NIGHT. BEHIND THIS FEATURE...A MID TO UPPER
LEVEL RIDGE WILL GRADUALLY BUILD ACROSS THE LOCAL AREA SUNDAY AND
MONDAY AND SHOULD LINGER THROUGH AT LEAST THE MIDDLE OF NEXT WEEK.

&&

.DISCUSSION...OLD FRONTAL TROUGH/CONVERGENCE ZONE AND ASSOCIATED
MOIST AND UNSTABLE AIR MASS WILL LINGER ACROSS THE LOCAL AREA
TONIGHT THROUGH AT LEAST SATURDAY AND PROBABLY SUNDAY AS WELL...
BEFORE A GRADUAL...OVERALL AIR MASS DRYING TAKES PLACE EARLY NEXT
WEEK. FOR TONIGHT AND SATURDAY...MOISTURE AND INSTABILITY SHOULD
COMBINE WITH AFOREMENTIONED MID TO UPPER LEVEL DISTURBANCE AND
LOCAL EFFECTS TO MAINTAIN A GOOD DEAL OF CLOUDINESS...SHOWERS AND
ISOLATED THUNDERSTORMS OVER PARTS OF THE LOCAL ISLANDS. FOR
SATURDAY NIGHT AND ESPECIALLY SUNDAY...BUILDING HIGH PRESSURE
SHOULD BEGIN TO CAP CONVECTION A BIT...BUT STILL SHOULD BE ENOUGH
MOISTURE IN COMBINATION WITH LOCAL EFFECTS...TO PRODUCE AT LEAST
LOCALIZED CLOUDINESS...SHOWERS AND POSSIBLY A COUPLE OF
THUNDERSTORMS. LOOKING AHEAD...FOR MONDAY AND TUESDAY AND PROBABLY
WEDNESDAY ALSO...COMBINATION OF MID TO UPPER LEVEL RIDGE AND AN
OVERALL DRIER AND MORE STABLE AIR MASS...SHOULD ALLOW FOR A
GENERALLY FAIR AND MAINLY DRY WEATHER PATTERN ACROSS THE FA.
HOWEVER...LOCAL EFFECTS WILL STILL BE ABLE TO PRODUCE SOME LIMITED
AND LOCALIZED CONVECTION EACH DAY. ADDITIONALLY...THE SURFACE WIND
FLOW IS EXPECTED TO BECOME SOUTHEAST DURING THIS TIME AND IF
ENOUGH SUNSHINE OCCURS...NORTH COASTAL TEMPERATURES MAY ONCE AGAIN
REACH THE LOWER 90S...AS INDICATED BY 12Z MEXJSJ GUIDANCE.

&&

.AVIATION...EXPECT PREVAILING VFR CONDITIONS ACROSS ALL TAF SITES
DURING THE NEXT 24 HOURS. BRIEF PERIODS OF MVFR OR EVEN IFR
CONDITIONS AND MOUNTAIN OBSCURATIONS ARE EXPECTED...ESPECIALLY
ACROSS TJPS...TJMZ...TJBQ...AND TIST DUE TO SHOWERS AND ISOLATED
THUNDERSTORMS. MOST SHOWERS AND THUNDERSTORMS WILL DISSIPATE BY
24/00Z. ALSO...BASED ON VISIBLE SATELLITE DATA DURING THE PAST
COUPLE OF HOURS...A SMALL PLUME OF VOLCANIC ASH OR STEAM IS MOVING
NORTHWEST FROM MONTSERRAT AND IS EXPECTED TO REMAIN CLOSE TO...BUT
JUST TO THE WEST OF TKPK FOR AT LEAST THE NEXT FEW HOURS.

&&

.MARINE...GENERALLY EXPECT WINDS OF 18 KNOTS OR LESS AND SEAS OF
6 FEET OR LESS ACROSS THE REGIONAL WATERS THROUGH SUNDAY.

&&

.PRELIMINARY POINT TEMPS/POPS...
SJU  76  87  75  85 /  30  40  30  30
STT  78  85  77  87 /  30  40  40  40

&&

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

HAZARDOUS WEATHER OUTLOOK FOR PUERTO RICO AND THE U.S. VIRGIN
ISLANDS
NATIONAL WEATHER SERVICE SAN JUAN PR
642 AM AST FRI APR 23 2010

AMZ710>745-PRZ001>013-241045-
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-
642 AM AST FRI APR 23 2010

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

.DAY ONE...TODAY AND TONIGHT

CLOUDINESS...SHOWERS AND ISOLATED THUNDERSTORMS ARE EXPECTED MAINLY
OVER THE SOUTHWESTERN OF PUERTO RICO THIS AFTERNOON. DUE TO THE
SLOW MOVEMENT AND HIGH MOISTURE CONTENT...SHOWERS WILL BE CAPABLE
OF PRODUCING HEAVY RAIN...THEREFORE URBAN AND SMALL STREAM
FLOODING WILL ALSO BE LIKELY.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

CLOUDINESS...SHOWERS AND ISOLATED THUNDERSTORMS ARE EXPECTED MAINLY
OVER THE WESTERN INTERIOR OF PUERTO RICO SATURDAY AFTERNOON.
THESE SHOWERS WILL BE CAPABLE OF PRODUCING HEAVY RAIN...THEREFORE
URBAN AND SMALL STREAM FLOODING WILL ALSO BE LIKELY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

AMZ715-725-VIZ001-002-241045-
ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX-
NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS-
642 AM AST FRI APR 23 2010

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

.DAY ONE...TODAY AND TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.