Flash Flood Warning 28, NWS JSJ

499 
WGCA72 TJSJ 222132
FFSSJU

Flash Flood Statement
National Weather Service San Juan PR
532 PM AST SAT JUL 22 2017

PRC021-061-127-139-222142-
/O.CAN.TJSJ.FF.W.0028.000000T0000Z-170722T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Trujillo Alto PR-San Juan PR-Guaynabo PR-Bayamon PR-
532 PM AST SAT JUL 22 2017

...THE FLASH FLOOD WARNING FOR TRUJILLO ALTO...SAN JUAN...GUAYNABO
AND BAYAMON MUNICIPALITIES IS CANCELLED...

The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed any remaining road closures.

LAT...LON 1833 6600 1831 6602 1831 6605 1837 6619
      1842 6616

$$

DS

Area Forecast Discussion
National Weather Service San Juan PR
308 PM AST Sat Jul 22 2017

.SYNOPSIS...A tropical wave with good moisture will move through
the area early tonight followed by drier air Sunday and Monday.
Moisture wrapping around a high pressure will reach the area on
Tuesday. A second tropical wave will follow on Thursday and better
moisture will follow it. Moisture tapers off slightly over the
following weekend.

&&

.SHORT TERM...Tonight through Tuesday
Winds shifted shortly after noon from a prevailing northeast flow
to an east southeast flow suggesting that the tropical wave or a
weaker trough may have passed through the area. The MIMIC product
shows the best moisture hanging back at about 61.5 degrees west as
of 22/13Z and present calculations suggest that it should cross
Saint Thomas at 23/05Z and San Juan at about 23/09Z--or earlier,
since there are indications that it is accelerating somewhat.
Currently tops have exceeded 50kft in western Puerto Rico, but
convection has been weaker in eastern Puerto Rico. Better rainfall
is expected overnight but it will likely be confined to the
southeast third of Puerto Rico with scattered showers around the
U.S. Virgin Islands.

With east to east southeast flow and a definite drop in
columnar moisture the first half of Sunday, maximum temperatures
should again broach the 90s on most of the north coast. Limited
moisture to counteract this heating on the south coast may also
allow high temperatures to resist the sea breezes and be
predominantly in the lower 90s. Monday will continue this trend.

Early Tuesday morning moisture arrives from the northeast that had
traveled around a high pressure north of the area and by Tuesday
afternoon precipitable water will be close to 2 inches again. This
will begin a wetter trend.

.LONG TERM...Wednesday through Saturday
Areas of moisture with a few dry slots move through the area
through Saturday on mostly easterly low level flow that will
sustain our seasonal summer pattern of showers and thunderstorms
each day. First around the U.S. Virgin Islands in the early
mornings and into eastern Puerto Rico, and then in the western and
interior portions of the Puerto Rico during the afternoons. No
strong features are currently seen in the models through the end
of July, but seasonal showers and thunderstorms often do produce
urban and small stream flooding in the afternoons.

&&

.AVIATION...SHRA/TSRA expected to continue over PR this afternoon
until around 22/22Z. This will cause VCSH or VCTS near the
terminals in PR. VCSH is expected for the remaining local
terminals as SHRA move in with the tropical wave that is bringing
plenty of moisture. Winds will continue from the east at about
10-15KT with higher gusts this afternoon, then decrease overnight
to around 10KT. Overnight weather will likely cause VCSH across
the local terminals except for TJMZ Limited MVFR and mtn
obscurations will likely continue through at least 23/16Z. Winds
alf easterly 10-20 kt up thru FL320 becmg easterly at all levels
by 24/00z. Winds strongest blo FL100.

&&

.MARINE...Seasonally tranquil seas of 5 feet or less are expected
in most of the local waters through the end of July. Small craft
advisories are not expected to be issued this month under the
current forecast. But winds up to 20 knots are possible in exposed
waters and small craft will need to exercise caution.

&&

.PRELIMINARY POINT TEMPS/POPS...
SJU  79  90  81  90 /  40  50  20  20
STT  80  89  81  90 /  60  60  20  20

&&

.SJU WATCHES/WARNINGS/ADVISORIES...
PR...None.
VI...None.
AM...None.
&&

SHORT TERM...JA
LONG TERM....WS

Perspectivas sobre condiciones peligrosas del tiempo
Servicio Nacional de Meteorologia San Juan PR
510 AM AST sabado 22 de julio de 2017

AMZ710>745-PRZ001>013-230915-
San Juan y Vecindad-Noreste-Sureste-
Este Interior-Norte Central-Interior Central-Ponce y Vecindad-
Noroeste-Oeste Interior-Mayaguez y Vecindad-Suroeste-Culebra-Vieques-
Aguas cercanas y lejanas a la costa del Atlantico y Caribe-
510 AM AST sabado 22 de julio de 2017

Esta perspectiva sobre las condiciones peligrosas del tiempo es
para Puerto Rico y las aguas costeras adyacentes del Atlantico.

.Dia uno...Hoy y Esta Noche

.Tronadas...Existe un potencial de tronadas con fuertes lluvias y
vientos en rafagas breves esta tarde, particularmente a traves de
sectores del interior y oeste de Puerto Rico.

.Inundaciones...Fuerte lluvias pudieran resultar en inundaciones
urbanas y de riachuelos.

.Olas...Se espera oleaje picado de 4 a 6 pies con oleaje ocasional
de hasta 8 pies a traves de las aguas lejanas a la costa del
Atlantico.

.Corrientes Marinas...Existe un riesgo moderado de corrientes
marinas a lo largo de las playas del norte de Puerto Rico, al igual
que playas del sureste de Puerto Rico y Vieques.

.Dias dos a siete...domingo a viernes

A medida que una onda tropical se mueva a traves del este del
Caribe, existe un potencial de aguaceros y tronadas, al igual que
inundaciones urbanas y de riachuelos hasta el domingo en la tarde.
Un riesgo moderado de corrientes marinas continuara a lo largo de
las playas del norte de Puerto Rico.

.Comunicado sobre informacion reportada por observadores...

No se anticipa activacion generalizada de observadores, sin embargo,
se exhorta a los observados a reportar inundaciones y corrientes
marinas a la oficina del Servicio Nacional de Meteorologia en San
Juan.

AMZ715-725-VIZ001-002-230915-
San Tomas, San John e islas adyacentes-Santa Cruz-
Aguas cercanas del Atlantico y aguas costeras adyacentes del Caribe-
510 AM AST sabado 22 de julio de 2017

Esta perspectiva sobre las condiciones del tiempo peligrosas es
para Puerto Rico y las aguas costeras adyacentes del Atlantico.

.Dia uno...Hoy y Esta noche

.Olas...Se espera oleaje picado de 4 a 6 pies con oleaje ocasional
de hasta 8 pies a traves de las aguas lejanas a la costa del
Atlantico.

.Corrientes Marinas...Existe un riesgo moderado de corrientes
marinas para las playas de Santa Cruz.

.Dias dos a siete...domingo a viernes

A medida que una onda tropical se mueva a traves del este del
Caribe, existe un potencial de aguaceros y tronadas, al igual que
inundaciones urbanas y de riachuelos hasta el domingo en la tarde.
Un riesgo moderado de corrientes marinas continuara a traves de
Santa Cruz.

.Comunicado sobre informacion reportada por observadores...

No se anticipa activacion generalizada de observadores, sin embargo,
se exhorta a los observados a reportar inundaciones y corrientes
marinas a la oficina del Servicio Nacional de Meteorologia en San
Juan.