Flash Flood Warning 81, NWS JSJ

000 
WGCA72 TJSJ 200518
FFSSJU

URGENT - IMMEDIATE BROADCAST REQUESTED
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN JUAN PR
119 AM AST WED JUL 20 2005

PRC025-129-145-143-021-139-200530-

119 AM AST WED JUL 20 2005

...THE FLASH FLOOD WARNING WARNINGS FOR THE FOLLOWING MUNICIPALITIES 
HAS BEEN ALLOWED TO EXPIRE....

IN PUERTO RICO
   SAN LORENZO...CAGUAS...VEGA ALTA...VEGA BAJA...BAYAMON AND 
TRUJILLO ALTO...

USGS RIVER GAUGES IN VEGA BAJA ALONG THE RIO CIBUCO...IN BAYAMON 
ALONG THE RIO BAYAMON...IN TRUJILLO ALTO ALONG THE RIO GRANDE DE 
LOIZA...INDICATE THAT THE RIVER LEVELS ALONG THESE RIVERS ARE 
SUBSIDING. THEREFORE... THE FLASH FLOOD WARNINGS HAVE BEEN ALLOWED 
TO EXPIRE FOR THE MUNICIPALITIES ABOVE.



$$

000 
WGCA72 TJSJ 200523 CCA
FFSSJU

URGENT - IMMEDIATE BROADCAST REQUESTED
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN JUAN PR
119 AM AST WED JUL 20 2005

PRC025-129-145-143-021-139-200600-

119 AM AST WED JUL 20 2005

...THE FLASH FLOOD WARNING WARNINGS FOR THE FOLLOWING MUNICIPALITIES 
HAS BEEN ALLOWED TO EXPIRE....

IN PUERTO RICO
   SAN LORENZO...CAGUAS...VEGA ALTA...VEGA BAJA...BAYAMON AND 
TRUJILLO ALTO...

USGS RIVER GAUGES IN VEGA BAJA ALONG THE RIO CIBUCO...IN BAYAMON 
ALONG THE RIO BAYAMON...IN TRUJILLO ALTO ALONG THE RIO GRANDE DE 
LOIZA...INDICATE THAT THE RIVER LEVELS ALONG THESE RIVERS ARE 
SUBSIDING. THEREFORE... THE FLASH FLOOD WARNINGS HAVE BEEN ALLOWED 
TO EXPIRE FOR THE MUNICIPALITIES ABOVE.



$$

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
200 PM AST TUE JUL 19 2005

.DISCUSSION...NOT AN EASY FORECAST TODAY. FEATURES IN PLACE AS TO
PRODUCE SOME ACTIVE WEATHER LAST NIGHT BUT SHOWERS AS WELL AS
RAINFALL AMOUNTS REPORTED WERE MINIMUM. THE 12Z SOUNDING MEASURED A
CONSIDERABLE MOIST AND UNSTABLE LOCAL AIRMASS WITH 2.05 INCHES OF
PRECIPITABLE WATER AND VALUES OF K AND LI OF 32 AND -7.9
RESPECTIVELY. DEW POINT VALUES OF AROUND 78 DEGREES WERE ALSO
MEASURED LOCALLY.

AT THE UPPER LEVELS THERE IS A TUTT CENTERED SOMEWHERE SOUTH OF
HISPANIOLA...PRODUCING A NORTHWARD UPPER FLOW OVER PUERTO RICO AND
THE U.S. VIRGIN ISLANDS. THIS FLOW IS ADVECTING UPPER LEVEL CLOUDS
INTO THE AREA FROM THE LOWER LATITUDES.

SHOWERS NOTED UPSTREAM SHOULD MOVE INTO THE LOCAL ISLANDS AND SOME
OTHER CAN DEVELOP ACROSS THE LAND OF PUERTO RICO. AGAIN SEEMS THAT
THE LOCAL AIRMASS REMAINS UNSTABLE ENOUGH AND MOIST AS TO ALLOW FOR
THE DEVELOPMENT OF SCATTERED TO NUMEROUS SHOWERS AND ISOLATED
THUNDERSTORMS OVER PUERTO RICO. HOWEVER STEERING WINDS OF AROUND 25
KNOTS WERE NOTED AND THE PRECIPITATION SHOULD MOVE QUICKLY WITH
ALMOST SAME SPEED.

&&

.AVIATION...A SIGMET WAS ISSUED FOR THE AREA OF STRONG THUNDERSTORMS
EXTENDING FROM NORTHEAST OF PUERTO RICO EASTWARD TO BEYOND THE
LEEWARD ISLANDS.

&&

.HYDROLOGY...ALTHOUGH THE PRECIPITATION IS MOVING RAPIDLY...THE
SHOWERS ARE SUFFICIENTLY HEAVY AS TO PRODUCE SOME URBAN FLOODING
ACROSS THE SECTORS OF PUERTO RICO.

&&

.CLIMATE...THE WEATHER STATION AT THE LMM INTERNATIONAL AIRPORT...SO
FAR THIS MONTH HAVE RECEIVED 4.28 INCHES OF RAINFALL WHICH IS 2.01
INCHES ABOVE THE NORMAL VALUE OF 2.27. YEAR TO DATE...FOR THE LMM
INTERNATIONAL AIRPORT THE MEASURED RAINFALL IS 16.93 INCHES ABOVE
THE NORMAL VALUE OF 22.25. SINCE JANUARY FIRST 39.18 INCHES OF RAIN
HAVE BEEN MEASURED AT THE LMM WFO STATION.

&&

.PRELIMINARY POINT TEMPS/POPS...
SJU  78  88  79  88 /  50  50  30  30
STT  79  87  80  87 /  50  50  30  30

&&

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

&&

11

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN JUAN PR
630 AM AST TUE JUL 19 2005

PRZ001>013-AMZ710>750-201000-
630 AM AST TUE JUL 19 2005

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO.

.DAY ONE...TODAY AND TONIGHT

A WEAK TROPICAL WAVE WILL COMBINE WITH LOCAL EFFECTS AND WILL LEAD
TO SCATTERED TO NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMS ACROSS
MAINLY THE CENTRAL AND WEST INTERIOR OF THE ISLAND. ANY
THUNDERSTORMS THAT DEVELOP MAY BECOME STRONG WITH HEAVY
DOWNPOURS...FREQUENT LIGHTNING AND BRIEF WIND GUSTS. THE HEAVY
DOWNPOURS WILL RESULT IN SIGNIFICANT PONDING OF WATER ON
ROADWAYS...POOR VISIBILITY...AND AT LEAST SOME URBAN AND SMALL
STREAM AND RIVER FLOODING AS WELL AS MUD SLIDES ACROSS THE HIGHER
TERRAINS.

.SPOTTER CALL TO ACTION STATEMENT...
SPOTTER ACTIVATION IS NOT ANTICIPATED.

.DAYS TWO THROUGH SEVEN...

THE INTERACTION WITH DIURNAL HEATING...AVAILABLE MOISTURE AND LOCAL
TERRAIN MAY RESULT IN POSSIBLE URBAN FLOODING DURING THE AFTERNOON
ACROSS CLIMATOLOGICAL FAVORED AREAS.

WINDS AND SEAS WILL INCREASE ON TUESDAY WHICH MAY REQUIRE A SMALL
CRAFT ADVISORY BE ISSUED.

VIZ001-002-AMZ710>730-201000-
630 AM AST TUE JUL 19 2005

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS.

.DAY ONE...TODAY AND TONIGHT

A TROPICAL WAVE WILL MOVE ACROSS THE LOCAL ISLANDS INCREASING THE
POTENTIAL FOR HEAVY SHOWERS AND THUNDERSTORMS ACROSS THE LOCAL
ISLANDS.

.SPOTTER CALL TO ACTION STATEMENT...
SPOTTER ACTIVATION IS NOT ANTICIPATED.

.DAYS TWO THROUGH SEVEN...

THE INTERACTION WITH DIURNAL HEATING...AVAILABLE MOISTURE AND LOCAL
EFFECTS MAY RESULT IN ISOLATED TO SCATTERED SHOWERS. AN ISOLATED
COASTAL THUNDERSTORM OR TWO ARE ALSO POSSIBLE.

WINDS AND SEAS WILL INCREASE ON TUESDAY WHICH MAY REQUIRE A SMALL
CRAFT ADVISORY BE ISSUED.

STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA FOR FURTHER
DETAILS OR UPDATES.

FOR ADDITIONAL INFORMATION...VISIT THE NATIONAL WEATHER SERVICE WEB
SITE FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS AT (ALL LOWERCASE
LETTERS): HTTP://WWW.SRH.NOAA.GOV/SJU.