Flash Flood Warning 4, NWS JSJ

241 
WGCA72 TJSJ 221931
FFSSJU

Flash Flood Statement
National Weather Service San Juan PR
331 PM AST Sat Mar 22 2025

PRC031-222100-
/O.CON.TJSJ.FF.W.0004.000000T0000Z-250322T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Carolina PR-
331 PM AST Sat Mar 22 2025

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 5 PM AST THIS 
AFTERNOON FOR CAROLINA COUNTY...

At 331 PM AST, Carolina's emergency management director reported 
several areas under flooding across the Municipality of Carolina. 
Some main areas experimenting flooding are: portions of the Roberto 
Clemente Avenue, Carolina Urban square and near Plaza Escorial, 
among other locations.
The Doppler radar estimated between 2 and 4 inches of rain with 
isolated areas up to 5 inches. Although the heavy rain has 
diminished, please continue to heed the remaining road closures.

HAZARD...Flash flooding caused by heavy rain.

SOURCE...Radar.

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.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 1844 6601 1846 6599 1843 6598 1843 6593
      1840 6592 1839 6593 1838 6591 1835 6592
      1834 6591 1832 6590 1829 6592 1827 6591
      1829 6594 1831 6594 1838 6600 1841 6599
      1845 6604

FLASH FLOOD...RADAR INDICATED

$$

CAM

468 
WGCA72 TJSJ 222051
FFSSJU

Flash Flood Statement
National Weather Service San Juan PR
451 PM AST Sat Mar 22 2025

PRC031-222101-
/O.EXP.TJSJ.FF.W.0004.000000T0000Z-250322T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Carolina PR-
451 PM AST Sat Mar 22 2025

...FLASH FLOOD WARNING WILL EXPIRE AT 5 PM AST THIS AFTERNOON FOR 
CAROLINA COUNTY...

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

&&

LAT...LON 1844 6601 1846 6599 1843 6598 1843 6593
      1840 6592 1839 6593 1838 6591 1835 6592
      1834 6591 1832 6590 1829 6592 1827 6591
      1829 6594 1831 6594 1838 6600 1841 6599
      1845 6604

$$

CAM

Area Forecast Discussion
National Weather Service San Juan PR
445 AM AST Sat Mar 22 2025

.SYNOPSIS...A cold front currently positioned over the Bahamas
and extending northward will gradually move eastward across the
Atlantic. As it progresses, the front is expected to weaken,
losing much of its intensity by the time it approaches our local
region. While the front may bring some subtle changes in wind
patterns and a slight increase on cloud cover, significant weather
impacts are unlikely due to its weakening state.

&&

.SHORT TERM...Today through Monday...
During the overnight hours, winds increased and gradually shifted
toward a more easterly component. This shift enhanced land-breeze
convergence along the northern coast of Puerto Rico and around
St. Thomas, supporting the development of scattered to locally
numerous showers across these areas.Portions of the NE Puerto Rico
including the San Juan metro area experience localized moderate to
heavy rain for briefed periods.

Moisture levels are expected to continue rising through the rest
of today, supporting the development of shower activity,
particularly across western Puerto Rico during the afternoon
hours. The forecast highlights a potential risk of excessive
rainfall, with localized urban and small stream flooding possible
mainly during the afternoon hours over the western portions of
Puerto Rico.

On Sunday, drying trend will begin to take hold across the
region. While isolated to scattered showers are still possible
during the afternoon hours, they will be more limited in coverage
and intensity compared to today. By Monday, a high pressure ridge
will build over the local area making it more stable with reducing
significantly the showers and cloud coverage across the local
forecast area.

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

Patches of moisture, with precipitable water values (PWAT) at around
1.5 in or more, will move over the region to start the long term
period, under east to east-southeast steering flow. A strong surface
high will be in place by Tuesday and will continue to promote up to
breezy wind flow. A mid to upper level ridge will also be present
Tuesday through early Thursday promoting more stable and drier
conditions aloft, with available moisture mostly contained below 700
mb. The start of the period will be characterized by the general
diurnal pattern, with overnight and morning trade wind showers
moving over windward sectors of the islands and afternoon convective
showers mainly over west-northwest Puerto Rico due to diurnal
heating, sea breeze convergence and local effects. Moisture and
instability increase somewhat to end the period, as a mid to upper
trough moves over the region Friday and Saturday. PWAT values will
also increase to at or above 1.5 in over the islands as a frontal
boundary or its remnants move over the region. These factors can
help boost the diurnal pattern late in the workweek and into the
weekend. The steering flow is forecast to back and become more
northeasterly by late Saturday. 925mb temperatures will be at normal
to above normal values to start the period.

&&

.AVIATION...
SHRA may bring brief periods of VFR conditions at TJSJ
through the period, USVI terminals after 22/06, and TJBQ between
22/16Z- 22/20Z. ENE winds at 5 to 10 knots will increase to 10 to
15 knots with higher gusts after 22/14Z.

&&

.MARINE...The large northerly swell that affected for the past few
days will continue to slowly subside today. As winds continue to
shift to an easterly direction and strengthen, reaching speeds of
15-25mph, wind related hazards along the coastal areas are
expected. Therefore expect choppy seas, hazardous marine
conditions, and an elevated risk of rip currents.

&&

.BEACH FORECAST...Although the large swell that impacted the local
waters over the past few days will continue to subside today
dangerous rip current conditions are expected to persist. This is
due to increasing winds across the local region, which will
maintain hazardous coastal and marine conditions. Beachgoers and
swimmers should exercise extreme caution, as strong rip currents
can pose a significant risk to even the most experience
individuals.

&&

.FIRE WEATHER...RH values should remain near or above critical
levels today across the region. Wind speeds will remain below
critical levels, with sea breezes influencing the coastal areas.
Therefore, there is a low fire danger today but we will continue
to closely monitor any changes to see if conditions warrant.

&&

.SJU WATCHES/WARNINGS/ADVISORIES...
PR...High Rip Current Risk through this afternoon for PRZ001-002-005-
 008-010-012.

VI...High Rip Current Risk through this afternoon for VIZ001.

AM...None.
&&

SHORT TERM...EM
LONG TERM....MRR
AVIATION...EM

Perspectiva sobre las Condiciones Peligrosas del Tiempo
Servicio Nacional de Meteorología San Juan PR
450 AM AST sábado 22 de marzo de 2025

AMZ711>745-PRZ001>013-230900-
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-
450 AM AST sábado 22 de marzo de 2025

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

.DÍA UNO...Hoy y esta noche

.Lluvia Excesiva...Acumulación de agua en carreteras y áreas de
pobre drenaje, particularmente a través del este-noreste de PR
durante las horas de la mañana y el oeste-noroeste de PR durante la
tarde. Existe una probabilidad baja de inundaciones urbanas
localizadas y de riachuelos pequeños.

.Viento...Condiciones de brisa fuerte (18-22 kts | 21-25 mph),
particularmente a través de las aguas y áreas costeras localizadas.
Los artículos no asegurados podrían salir volando.

.Condiciones Marítimas...Las embarcaciones pequeñas deben ejercer
precaución, particularmente a través de las Aguas del Atlántico y el
Pasaje de la Mona.

.Corrientes Marinas...Corrientes marinas amenazantes a la vida
son probables en la zona de olas rompientes, particularmente a
través de las playas orientadas al norte de Puerto Rico y Culebra.
Estas condiciones amenazantes a la vida son posibles a través de las
áreas mencionadas anteriormente, con corrientes marinas aisladas más
fuertes posibles en otros lugares, especialmente cerca de muelles y
canales.

.DÍAS DOS A SIETE...domingo a viernes

La marejada grande que impactó las aguas locales por los pasados
días debe haber disminuido el domingo. Una alta presión se
desarrollará sobre el área local más tarde hoy aumentando los
vientos a través de las aguas locales y las áreas costeras.  Un
patrón de tiempo inestable evolucionará este fin de semana,
aumentando el potencial de lluvias e inundaciones, aunque una
tendencia a condiciones mas secas comenzará el domingo.  Una alta
presión en la superficie se moverá hacia el Atlántico central
principios de la semana próxima, promoviendo condiciones estables y
más secas. La humedad y la inestabilidad aumentan nuevamente el
viernes.

.COMUNICADO SOBRE INFORMACIÓN DE OBSERVADORES...

No será necesaria la activación de observadores.

AMZ716-726-VIZ001-002-230900-
San Thomas San John e islas adyacentes-Santa Cruz-
Aguas cercanas a la costa del Atlántico y aguas costeras adyacentes
del Caribe-
450 AM AST sábado 22 de marzo de 2025

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

.DÍA UNO...Hoy y esta noche
.Viento...Condiciones de brisa fuerte (18-22 kts | 21-25 mph),
particularmente a través de las aguas y las áreas costeras
localizadas.  Los artículos no asegurados podrían salir volando.

.Condiciones Marítimas...Las embarcaciones pequeñas deben ejercer
precaución, particularmente a través de las Aguas del Atlántico.

.Corrientes Marinas...Corrientes marinas amenazantes a la vida
son probables en la zona de olas rompientes, particularmente a
través de las Islas Vírgenes Estadounidenses del norte. Estas
condiciones amenazantes a la vida son posibles a través de las áreas
mencionadas anteriormente, con corrientes marinas aisladas más
fuertes posibles en otros lugares, especialmente cerca de muelles,
muelles y canales.

.DÍAS DOS A SIETE...domingo a viernes

La marejada grande que impactó las aguas locales por los pasados
días debe haber disminuido el domingo. Una alta presión se
desarrollará sobre el área local más tarde hoy aumentando los
vientos a través de las aguas locales y las áreas costeras.  Un
patrón de tiempo inestable evolucionará este fin de semana,
aumentando el potencial de lluvias e inundaciones, aunque una
tendencia a condiciones mas secas comenzará el domingo.  Una alta
presión en la superficie se moverá hacia el Atlántico central
principios de la semana próxima, promoviendo condiciones estables y
más secas. La humedad y la inestabilidad aumentan nuevamente el
viernes.

.COMUNICADO SOBRE INFORMACIÓN DE OBSERVADORES...

No será necesaria la activación de observadores.