Flash Flood Warning 91, NWS JSJ

050 
WGCA52 TJSJ 171737
FFWSJU
PRC127-172100-
/O.EXT.TJSJ.FF.W.0091.000000T0000Z-240817T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Juan PR
137 PM AST Sat Aug 17 2024

The National Weather Service in San Juan has extended the

* Flash Flood Warning for...
  San Juan County in Puerto Rico...

* Until 500 PM AST.

* At 137 PM AST, Emergency management reported thunderstorms 
  producing heavy rain across the warned area. Between 1 and 3 
  inches of rain have fallen. Additional rainfall amounts up to 2 
  inches are possible in the warned area. Flash flooding is ongoing 
  or expected to begin shortly.

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Emergency management reported.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, highways, streets and underpasses.

* San Juan OMME director reported several flooded areas/roads ; 
  Avenida Ponce De Leon, Cantera, Reparto Metropolitano, and nearby.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 1843 6603 1840 6599 1838 6600 1837 6603
      1830 6605 1830 6608 1834 6610 1836 6609
      1843 6611 1844 6609 1844 6608 1844 6607
      1847 6612 1845 6604

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

RC

657 
WGCA72 TJSJ 172051
FFSSJU

Flash Flood Statement
National Weather Service San Juan PR
451 PM AST Sat Aug 17 2024

PRC127-172101-
/O.CAN.TJSJ.FF.W.0091.000000T0000Z-240817T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Juan PR-
451 PM AST Sat Aug 17 2024

...FLASH FLOOD WARNING IS CANCELLED FOR SAN JUAN COUNTY...

Flood waters have receded. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

&&

LAT...LON 1843 6603 1840 6599 1838 6600 1837 6603
      1830 6605 1830 6608 1834 6610 1836 6609
      1843 6611 1844 6609 1844 6608 1844 6607
      1847 6612 1845 6604

$$

CAM

Area Forecast Discussion...CORRECTED
National Weather Service San Juan PR
710 AM AST Sat Aug 17 2024

.SYNOPSIS...
Hot conditions will linger across the islands for the next several
days. A tropical wave will also approach, increasing the chances
of showers and thunderstorms. Saharan dust will follow this wave,
resulting in hazy skies.

&&

.SHORT TERM...Today through Monday...

Current Satellite derived precipitable water (PWAT) indicate a mass
of above normal values (above 2.0 inches) now over
easternmost/southeasternmost Puerto Rico, the USVI, Vieques and
Culebra. This contrasts the normal PWAT values (around 1.80
inches) across the rest of the region. Passing showers slowly
gained more frequency overnight, affecting the eastern region of
the area. One particular isolated thunderstorm moved over St.
Croix overnight with radar rain estimates up to one quarter inch.
Lows ranged from the upper 70s to the low 80s across lower
elevations of the islands to upper 60s and low 70s across interior
Puerto Rico.

We'll start the weekend with increasing moisture and instability as
a weak tropical wave affects the region today and tomorrow. Above
normal PWAT levels (above 2.0 inches) will persist through late
Sunday. These conditions will give an extra boost to the typical
weather pattern. This pattern includes periods of passing
overnight and early morning showers across windward sectors of the
islands, followed by afternoon showers and thunderstorms mainly
over interior to western/northwestern Puerto Rico each day. Lines
of convection can also develop northwest of the local islands and
El Yunque under southeasterly winds. Winds will gradually back
through the period, becoming easterly on Monday. PWAT values will
decrease to more normal values to start the workweek, coinciding
with a pulse of Saharan dust that will also promote hazy skies.

Elevated to significant heat risks will persist through the short
term period. For today (10 AM to 5 PM AST), an Excessive Heat
Warning will be in effect for all coastal and lower elevation areas
of the island, and a Heat Advisory will be in effect for lower
elevations (mostly the valleys of Caguas and Gurabo) of eastern
interior Puerto Rico. Drink plenty of fluids, stay in an air-
conditioned room (if possible and if power is available), stay out
of the sun, check up on relatives and neighbors, and take extra
precautions when outside. Conditions during the coming days present
significant health risks and may require the issuance of additional
Excessive Heat Advisories and Warnings.

.LONG TERM...Tuesday through Saturday

Hazy skies are anticipated on Tuesday as Saharan dust lingers. By
Wednesday, patches of moisture associated with a tropical wave
will approach. However, this system looks weak and rather
fragmented, so the shower activity should not be too widespread.
Additionally, the air mass will remain dry at the mid and upper
levels, so these showers should not have enough vertical
development to drop heavy rainfall accumulations. By the latter
part of the week, moisture will increase, and an upper level
trough will approach from the Lesser Antilles. In fact,
precipitable water value will be well above normal Thursday and
Friday. On these days, showers will become more frequent over the
Virgin Islands and eastern Puerto Rico. The activity will be
stronger in the afternoon for the interior and western Puerto
Rico, where the risk of lightning and flooding will be elevated.

Hot temperatures will continue too. Temperatures at 925 mb will
not be as high as the past couple of days, but still above normal.
This heat will impact sensitive groups, especially those without
effective cooling or adequate hydration.

&&

.AVIATION...
(06Z TAFS)

Mainly VFR conditions across the terminals. S-SE winds up to 12 kts
with sea breeze variations and higher gusts, decreasing after
17/22Z, when land breezes start to influence. Brief MVFR conditions
can result from morning VCSH/VCTS that can affect eastern sites &
VCSH/VCTS starting over the interior that can affect the PR sites,
especially TJBQ around 17/17Z-22Z.

&&

.MARINE...
Light to moderate east-to-southeast winds will continue through the
weekend, providing favorable conditions for small craft. However,
moderate to locally fresh winds from a tropical wave will lead to
choppy seas for small craft early next week.

&&

.BEACH FORECAST...
The risk of rip currents is moderate today across the northern
coast of Puerto Rico. A swell from Hurricane Ernesto will reach
the islands by Monday, and the risk might increase to high.

&&

.SJU WATCHES/WARNINGS/ADVISORIES...
PR...Excessive Heat Warning from 10 AM this morning to 5 PM AST this
     afternoon for PRZ001>003-005-007-008-010>013.

     Heat Advisory from 10 AM this morning to 5 PM AST this afternoon
     for PRZ004.

VI...Excessive Heat Warning from 10 AM this morning to 5 PM AST this
     afternoon for VIZ001-002.

AM...None.
&&

SHORT TERM...MRR
LONG TERM....ERG

Perspectiva sobre las Condiciones Peligrosas del Tiempo
Servicio Nacional de Meteorología San Juan PR
449 AM AST sábado 17 de agosto de 2024

AMZ711>745-PRZ001>013-180900-
San Juan y Vecindad-Noreste-Sureste-Este Interior-
Norte Central-Central Interior-Ponce y Vecindad-Noroeste-
Oeste Interior-Mayagüez y Vecindad-Suroeste-Culebra-Vieques-
Las aguas cercanas y fuera de la costa del Atlántico y del Caribe-
449 AM AST sábado 17 de agosto de 2024

Esta perspectiva sobre las condiciones peligrosas del tiempo es para
sectores de Puerto Rico.

.DÍA UNO...Hoy y esta noche

.Rayos...Tormentas eléctricas aisladas a dispersas posibles. Esté
atento a tormentas eléctricas en su área y esté preparado para
buscar refugio.

.Lluvia Excesiva...Acumulación de agua en carreteras y áreas de mal
drenaje, principalmente a través de municipios del noroeste. Las
inundaciones urbanas y de riachuelos son posibles.

.Calor Excesivo...Este nivel de calor afecta a cualquier persona sin
enfriamiento efectivo y/o hidratación adecuada. Impactos probables
en algunos sistemas de salud, industrias sensibles al calor e
infraestructura.

.Corrientes Marinas...Corrientes marinas amenazantes a la vida son
posibles en la zona de resaca particularmente en la costa norte de
PR y Culebra.

.DÍAS DOS A SIETE...domingo a viernes

Habrá mayormente un riesgo limitado de lluvia excesiva y rayos hasta
el resto del fin de semana, especialmente durante las horas de la
tarde sobre el oeste de Puerto Rico. Se espera calor excesivo en
algunas elevaciones más bajas y áreas urbanas cada día. Hay un
riesgo de bajo a moderado de corrientes marinas en algunas playas.
Peligros maritimos limitados regresan el domingo hasta la próxima
semana.  Una marejada causada por el Huracán Ernesto alcanzará las
islas el lunes, y el riesgo de corrientes marinas podría aumentar a
alto.

.COMUNICADO SOBRE INFORMACIÓN DE OBSERVADORES...
No será necesaria la activación de observadores.

AMZ716-726-VIZ001-002-180900-
San Thomas San John e islas adyacentes-Santa Cruz-
Aguas cercanas a la costa del Atlántico y aguas costeras adyacentes
del Caribe-
449 AM AST sábado 17 de agosto de 2024

Esta Perspectiva sobre las Condiciones Peligrosas del Tiempo es para
sectores de las Islas Vírgenes Americanas.

.DÍA UNO...Hoy y esta noche

.Rayos...Tormentas eléctricas aisladas a dispersas posibles. Esté
atento a las tormentas eléctricas en su área y esté preparado para
buscar refugio.

.Lluvia Excesiva...Acumulación de agua en carreteras y áreas de mal
drenaje. Las inundaciones urbanas y de riachuelos son posibles.

.Calor Excesivo...Este nivel de calor afecta a cualquier persona sin
enfriamiento efectivo y/o hidratación adecuada. Impactos probables
en algunos sistemas de salud, industrias sensibles al calor e
infraestructura.

.Corrientes Marinas...Corrientes marinas amenazantes a la vida son
posibles en la zona de resaca particularmente a través del noroeste
de St. Thomas.

.DÍAS DOS A SIETE...domingo a viernes

Se espera calor excesivo en algunas elevaciones más bajas y áreas
urbanas cada día. Hay un riesgo de bajo a moderado de corrientes
marinas en algunas playas. Los peligros maritimos limitados regresan
el domingo hasta la próxima  semana.  Una marejada causada por el
Huracán Ernesto alcanzará las islas el lunes, y el riesgo de
corrientes marinas podría aumentar a alto.

.COMUNICADO SOBRE INFORMACIÓN DE OBSERVADORES...

No será necesaria la activación de observadores.

Preliminary Local Storm Report
National Weather Service San Juan PR
1239 PM AST Sat Aug 17 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1230 PM     Flood            2 NE San Juan           18.42N 66.05W
08/17/2024                   San Juan           PR   911 Call Center

            911 Call Center reported flooded roads at
            Calle Italia with Calle Julia at Area de los
            Mitas in San Juan.

&&

GRS

Preliminary Local Storm Report
National Weather Service San Juan PR
1246 PM AST Sat Aug 17 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1237 PM     Flood            1 NNE San Juan          18.42N 66.06W
08/17/2024                   San Juan           PR   911 Call Center

            911 Call Center reported flooding at Ave
            Roosevelt before the train station entrance
            near Rubens Cafe.

&&

GRS