Flash Flood Warning 38, NWS JSJ

131 
WGCA72 TJSJ 261924
FFSSJU

Flash Flood Statement
National Weather Service San Juan PR
324 PM AST Sat Aug 26 2023

PRC113-262130-
/O.CON.TJSJ.FF.W.0038.000000T0000Z-230826T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Ponce PR-
324 PM AST Sat Aug 26 2023

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 PM AST THIS 
AFTERNOON FOR PONCE COUNTY...

At 324 PM AST, Doppler radar and automated rain gauges indicated 
thunderstorms producing heavy rain across the warned area. Between 1 
and 4 inches of rain have fallen. Recent USGS sensors along Rio 
Inabon at Sector Real Abajo indicated that the river and tributaries 
are at or quickly approaching Flood stage. Any additional rains will 
continue to aggravate this situation. Additional rainfall amounts up 
to 1 inch are possible in the warned area. Flash flooding is ongoing 
or expected to begin shortly.

HAZARD...Flash flooding caused by thunderstorms and excessive
         rainfall.

SOURCE...Radar and automated gauges.

IMPACT...Flash flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other poor
         drainage and low-lying areas.

Some locations that will experience flash flooding include...
  Ponce, Coto Laurel, Aguilita, Capitanejo, Marueno and Tallaboa.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Stay away or be swept away. River banks and culverts can become 
unstable and unsafe.

&&

LAT...LON 1798 6670 1799 6669 1809 6668 1813 6669
      1813 6668 1815 6667 1816 6665 1815 6663
      1817 6659 1815 6655 1813 6657 1810 6655
      1809 6656 1800 6653 1797 6654 1796 6658
      1797 6659 1796 6662 1798 6663 1797 6667

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

RAM

021 
WGCA52 TJSJ 262122
FFWSJU
PRC113-262230-
/O.EXT.TJSJ.FF.W.0038.000000T0000Z-230826T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Juan PR
522 PM AST Sat Aug 26 2023

The National Weather Service in San Juan has extended the

* Flash Flood Warning for...
  Ponce County in Puerto Rico...

* Until 630 PM AST.

* At 522 PM AST, emergency managers, as well as sensors from USGS 
  indicated that Rio Inabon was at flood stage. Road PR-511 has to 
  be closed due to ongoing flooding.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar and automated gauges.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Stay away or be swept away. River banks and culverts can become 
unstable and unsafe.

&&

LAT...LON 1798 6670 1799 6669 1809 6668 1813 6669
      1813 6668 1815 6667 1816 6665 1815 6663
      1817 6659 1815 6655 1813 6657 1810 6655
      1809 6656 1800 6653 1797 6654 1796 6658
      1797 6659 1796 6662 1798 6663 1797 6667

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

ERG

856 
WGCA72 TJSJ 262214
FFSSJU

Flash Flood Statement
National Weather Service San Juan PR
614 PM AST Sat Aug 26 2023

PRC113-262224-
/O.CAN.TJSJ.FF.W.0038.000000T0000Z-230826T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Ponce PR-
614 PM AST Sat Aug 26 2023

...FLASH FLOOD WARNING FOR PONCE COUNTY HAS BEEN REPLACED WITH A 
FLOOD ADVISORY...

LAT...LON 1798 6670 1799 6669 1809 6668 1813 6669
      1813 6668 1815 6667 1816 6665 1815 6663
      1817 6659 1815 6655 1813 6657 1810 6655
      1809 6656 1800 6653 1797 6654 1796 6658
      1797 6659 1796 6662 1798 6663 1797 6667

$$

ER

Area Forecast Discussion
National Weather Service San Juan PR
1138 AM AST Sat Aug 26 2023

...New UPDATE, AVIATION, MARINE...

.UPDATE...
Issued at 1100 AM AST Sat Aug 26 2023

Rain bands from the very far away Franklin have been producing
cloudy skies and periods of locally heavy rain across the south
half portion of PR. Rainfall accumulations so far across southern
PR are around an inch and between 2 and 4 inches across Southeast
PR and eastern PR. On the other hand, the US Virgin Islands
received only a few tenth of an inch. The winds will continue
from the SSW under an above-normal moist environment (with a TPW
of about 2.13 inches) and unstable weather conditions.

Afternoon convection will develop across the Cordillera Central
and most of PR. We cannot rule out sudden strong winds, frequent
lightning, and downpours due to pulse storms. The rain activity
(even isolated thunderstorms) may spread over the Virgin Islands
but in smaller amount.

&&

.AVIATION...
(18Z TAFS)
Issued at 1100 AM AST Sat Aug 26 2023

VFR conditions under an SSE-S wind flow of around 10 kt will
continue during the morning. SHRA/+TSRA may develop between
24/15-22z across north-central PR or near the SJU metro. However,
sea breeze variations may sometimes increase winds between 10 and
15 kt or even higher through 24/23z; winds will then become calm
to light and VRB.

&&

.AVIATION...

Mainly VFR conds at all terminals through the period. However,
SHRA/TSRA will continue to affect the local flying area due to
outer band from Franklin. Mtn top obscd over central interior PR
and BKN-OVC lyrs btw FL050-FL150 will continue throught the day.
Sfc wnds S-SW at 5-10 kts with higher gusts near convective
activity.

&&

.MARINE...
Issued at 1100 AM AST Sat Aug 26 2023

We expect calm marine conditions with seas between 2 and 5 feet
and winds around 15 knots. Afternoon thunderstorms may develop
across the local waters, creating hazardous marine conditions.
Please, exercise caution.

&&

.SYNOPSIS...

The tail from tropical storm Franklin, now located north of the
region at about 300 miles of San Juan, resulted in a very active
night with strong showers and scattered thunderstorms across the
south coast of Puerto Rico and local waters. This trail of
cloudiness and moisture is forecast to remain in the area,
resulting in cloudy skies and shower activity during the rest of
the morning and afternoon hours. As Tropical Storm Franklin moves
northward, as suggested by the official track from the National
Hurricane Center, a more typical weather pattern is forecast for
the islands with easterly winds. Tranquil marine conditions would
prevail during the period, with a moderate risk of rip currents
for the north-exposed beaches today.

&&

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

The tail from Tropical Storm Franklin is lingering over the region
and scattered to numerous showers with strong thunderstorms
redeveloped along a line from the Mona Passage into east/southeast
PR. The Doppler radar estimated up to 5 inches in Patillas and
Maunabo, and up to 3 inches in Ponce and Salinas. Any additional
shower development along the southern and eastern sections of PR may
lead to flash flooding and mudslides in areas of steep terrain. A
Flash Flood Warning remains in effect for the municipalities of
Arroyo, Guayama, Maunabo, and Patillas through 630 AM AST. Rivers
across these areas were running close to minor flood stage. For the
rest of the day expect the moisture plume to linger across the
region, and southerly winds should push fragmented low-level
moisture across portions of PR, as well across Vieques, Culebra and
the northern USVI.

For the rest of the short term period, normal to above normal
precipitable water content(2.00-2.30 inches) could linger over the
region through late Sunday night, and 500 mb temperatures should
remain between minus 6-7 degrees Celsius, providing unstable
conditions aloft. As TC Franklin continues to strengthens and slowly
move northwards, expect veering of winds and abundant tropical
moisture over the islands. The sea breeze is expected to develop
along the northern coastal areas of PR, and this should enhance
convective activity along the northern slopes and coastal areas of
PR. Today, particularly over San Juan and vicinity and over north
central PR on Sunday. A drier air mass is expected to move from the
east/southeast on Monday, and this should limit the areal coverage
of showers over land areas. Max temperatures could reach the low
90s, if there is a break in clouds between the late morning and
early afternoon hours. Southerly winds and high moisture content
should keep warm to hot temperatures along the urban and lower

&&

.LONG TERM...Tuesday through Saturday...

A variable weather pattern will prevail for the long-term period.
As tropical storm Franklin moves northward far away from the
Caribbean, a building surface high pressure over the western
Atlantic will re-establish the easterly trade winds across the
area. This pattern will introduce a more summer-typical weather
pattern across the islands, with the usual morning pesky showers
followed by the western interior showers for Tuesday. By
Wednesday, tropical moisture, now located just a few miles east of
the Lesser Antilles, will be dragged by the surface winds and
increase the frequency of shower activity across the islands.
According to the latest run from the Gálvez-Davison Index (GDI),
there is potential for isolated to scattered thunderstorms across
the interior in the afternoon.

The bulk of the humidity will be out of the region by Thursday,
leaving PWAT values in the climatological normals over the islands.
However, the proximity of a mid-level (700-500 MB) trough will
enhance the vertical development on Thursday into early Friday
across the local waters and west Puerto Rico. By Friday, enough
moisture will cover the CWA again as a tropical wave reaches the
islands. So far today, PWAT values will go to 2.1 inches, and 500
MB temperatures will round in the -6 to -7 degrees. For the U.S.
Virgin Islands, a typical summer pattern is forecast for the whole
period, with the usual pesky brief passing showers in the
mornings and variable conditions in the afternoons.

&&

.AVIATION...

Mainly VFR conds at all terminals through the period. However,
SHRA/TSRA will continue to affect the coastal waters of PR and the
USVI due to outer band from TS Franklin. Mtn top obscd over
eastern PR and BKN-OVC lyrs btw FL050-FL150 will continue throught
the day. Sfc wnds S-SW at 5-10 kts with higher gusts near
convective activity.

&&

.MARINE...

Light to moderate southerly winds will prevail due to the
Tropical Storm Franklin, now 300 miles north of San Juan, PR. This
system is forecast to continue a northward movement as suggested
by the official track from the National Hurricane Center.
Therefore, mostly tranquil marine conditions will prevail with
seas up to 5 feet across all the waters and winds up to 15 knots.
Although marine conditions are mostly favorable, localized choppy
to hazardous marine conditions are expected near the heavy showers
and thunderstorms from the external bands of Franklin affecting
the area today. Therefore, mariners are urged to stay tuned for
marine statements. There is a moderate risk of rip currents across
the north expose beaches of PR, for the rest of the coastal areas
the risk will remain low.

&&

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

CAM/GRS

Perspectivas sobre las Condiciones Peligrosas del Tiempo
Nacional de Meteorologia en San Juan PR
506 AM AST sabado 26 de agosto de 2023

AMZ711>745-PRZ001>013-270915-
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 del Caribe-
506 AM AST sabado 26 de agosto de 2023

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

.DIA UNO...Esta tarde y esta noche

.Rayos...Tronadas aisladas son posibles a traves de Puerto Rico.
Este atento a las tormentas electricas en su area y este preparado
para refugiarse.

.Lluvia Excesiva...Inundaciones en areas urbanas, carreteras y riachuelos.
Inundaciones repentinas aisladas son posibles.

.Calor Excesivo...Indices de calor de 102 a 107 grados a traves de
los municipios costeros urbanos y costeros. Agotamiento por calor es
probable con exposicion prolongada.

.Corrientes Marinas...Corrientes marinas amenazantes a la vida son
posibles en la zona de ola rompiente particularmente a traves de
las playas del norte de Puerto Rico.

.DIAS DOS A SIETE...domingo a viernes

Las bandas de la cola del Ciclon Tropical Franklin podran alcanzar
el area hasta el sabado. Indices de calor entre 102 a 110 grados son
posibles durante horas del medio dia a traves de la mayoria de los
lugares de elevaciones bajas durante el periodo largo. Tronadas son
posibles cada dia. Se espera un riesgo moderado de corrientes
marinas para las playas del noroeste, y norte-central.

.Comunicado sobre informacion reportada por observadores...

No se recomienda la activacion de los observadores.

AMZ716-726-VIZ001-002-270915-
San Tomas, San John y las Islas Adyacentes-Santa Cruz-
Aguas cercanas a la Costa del Atlantico y aguas costeras
adyacentes del Caribe-
506 AM AST sabado 26 de agosto de 2023

Esta perspectiva sobre las condiciones peligrosas del tiempo es para
las Islas Virgenes Estadounidenses.

.DIA UNO...Esta tarde y esta noche

.Rayos...Tronadas aisladas son posibles al norte de las Islas
Virgenes Americanas. Este atento a las tormentas electricas en su
area y este preparado para refugiarse.

.Lluvia Excesiva...Inundaciones en areas urbanas, carreteras y
riachuelos. Inundaciones repentinas aisladas son posibles.

.Calor Excesivo...Indices de calor de 102 a 107 grados a traves de
las islas. Agotamiento por calor es probable con exposicion
prolongada.

.DIAS DOS A SIETE...domingo a viernes

Las bandas de la cola del Ciclon Tropical Franklin podran alcanzar
el area hasta el sabado. Indices de calor entre 102 a 110 grados son
posibles durante horas del medio dia a traves de la mayoria de los
lugares de elevaciones bajas durante el periodo largo. Habra un
riesgo bajo de corrientes marinas para todas las playas de las Islas
Virgenes Americanas.

.Comunicado sobre informacion reportada por observadores...

No se requiere la activacion de los observadores.

Preliminary Local Storm Report
National Weather Service San Juan PR
1206 PM AST Sat Aug 26 2023

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

0510 AM     Flash Flood      1 WNW Patillas          18.01N 66.03W
08/26/2023                   Patillas           PR   Emergency Mngr

            A report from Emergency Managers indicated
            that three houses were affected by flooding
            in Urb. Valles de Patillas.

&&

ERG

Comunicado Especial sobre las Condiciones del Tiempo
Servicio Nacional de Meteorologa San Juan PR
1204 PM AST sbado 26 de agosto de 2023

PRZ006-007-261730-
Interior Central PR-Ponce y Vecindad PR-
1204 PM AST sbado 26 de agosto de 2023

...Una tormenta elctrica fuerte impactar sectores de los
municipios desde Santa Isabel hasta Penuelas hasta las 130 PM AST...

A las 1202 PM AST, las tormentas elctricas fuertes estaban
localizadas sobre Juana Diaz y Ponce, movindose hacia el noreste a
20 mph.

PELIGRO...Vientos de 40 a 50 mph, rayos frecuentes de nubes a suelo
y lluvia fuerte.

FUENTE...Indicado por radar.

IMPACTO...Espere daos menores en las ramas de los rboles y objetos
ligeros, no asegurados.  La lluvia fuerte puede causar inundaciones
temporales de las calles, especialmente en reas de drenaje pobre.

MEDIDAS DE PRECAUCIN/PREPARACIN...

Las personas en el exterior deben buscar refugio inmediatamente.  Si
puedes or un trueno, ests lo suficientemente cerca como para ser
alcanzado por un rayo.  Los automovilistas deben reducir la
velocidad y estar preparados para una posible prdida de control
debido al hidroplaneo.

LAT...LON 1833 6636 1837 6631 1832 6621 1828 6621 1824 6627 1810
6622 1805 6631 1794 6639 1799 6646 1801 6677 1798 6679 1798 6678
1797 6679 1797 6686 1815 6692 1811 6673 1813 6668 1831 6657 1834
6660 1838 6642 TIME...MOT...LOC 1602Z 213 15KT 1805 6653

TAMAO DE GRANIZO MXIMO...0.00 EN RFAGA DE VIENTO MXIMA...50 MPH

CAM/GRS

Preliminary Local Storm Report
National Weather Service San Juan PR
1226 PM AST Sat Aug 26 2023

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

0500 AM     Flash Flood      1 E Palo Seco           18.01N 65.93W
08/26/2023                   Maunabo            PR   Emergency Mngr

            Emergency Managers indicated that Rio
            Maunabo went out of its banks, overflowing
            over a bridge.

&&

ERG

Comunicado Especial sobre las Condiciones del Tiempo...CORRECCION
Servicio Nacional de Meteorologa San Juan PR
1204 PM AST sbado 26 de agosto de 2023

Interior Central PR-Ponce y Vecindad PR-
1204 PM AST sbado 26 de agosto de 2023

...Una tormenta elctrica fuerte impactar sectores de los
municipios desde Santa Isabel hasta Penuelas hasta las 130 PM AST...

A las 1202 PM AST, las tormentas elctricas fuertes estaban
localizadas sobre Juana Diaz y Ponce, movindose hacia el noreste a
20 mph.

PELIGRO...Vientos de 40 a 50 mph, rayos frecuentes de nubes a suelo
y lluvia fuerte.

FUENTE...Indicado por radar.

IMPACTO...Espere daos menores en las ramas de los rboles y objetos
ligeros, no asegurados.  La lluvia fuerte puede causar inundaciones
temporales de las calles, especialmente en reas de drenaje pobre.

MEDIDAS DE PRECAUCIN/PREPARACIN...

Las personas en el exterior deben buscar refugio inmediatamente.  Si
puedes or un trueno, ests lo suficientemente cerca como para ser
alcanzado por un rayo.  Los automovilistas deben reducir la
velocidad y estar preparados para una posible prdida de control
debido al hidroplaneo.

TAMAO DE GRANIZO MXIMO...0.00
RFAGAS DE VIENTO MXIMA...50 MPH

CAM/GRS

Special Weather Statement
National Weather Service San Juan PR
106 PM AST Sat Aug 26 2023

PRZ001-004-261815-
San Juan and Vicinity PR-Eastern Interior PR-
106 PM AST Sat Aug 26 2023

...A strong thunderstorm will impact portions of Aguas Buenas,
Bayamon, Toa Alta, Comerio, Cayey and Aibonito Municipalities
through 215 PM AST...

At 102 PM AST, a strong thunderstorm was near Naranjito and
Barranquita, moving northeast at 25 mph. The thunderstorm will
impact the San Juan Metropolitan area in an hour or so.

HAZARD...40 to 50 mph wind, frequent cloud to ground lightning and
         heavy rain.

SOURCE...Radar indicated.

IMPACT...Expect minor damage to tree limbs and blowing around of
         light, unsecured objects. Heavy rain may cause temporary
         street flooding especially in poor drainage areas.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People outdoors should seek shelter immediately. If you can hear
thunder, you are close enough to be struck by lightning. Motorists
should slow down and be prepared for possible loss of control due to
hydroplaning.

&&

LAT...LON 1846 6599 1842 6593 1827 6592 1827 6582
      1819 6583 1809 6594 1807 6601 1810 6602
      1811 6610 1804 6614 1805 6620 1821 6627
      1832 6621 1837 6632 1839 6625 1845 6626
      1847 6619 1843 6611 1846 6612
TIME...MOT...LOC 1702Z 228DEG 21KT 1828 6620

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

CAM

Preliminary Local Storm Report
National Weather Service San Juan PR
218 PM AST Sat Aug 26 2023

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

0218 PM     Debris Flow      3 NW Celada             18.30N 65.99W
08/26/2023                   Gurabo             PR   Newspaper

            A mudslide was reported in road PR-181 from
            Gurabo to Trujillo Alto.

&&

ERG