Flash Flood Warning 1, NWS JSJ

273 
WGCA72 TJSJ 241504
FFSSJU

Flash Flood Statement
National Weather Service San Juan PR
1104 AM AST Mon Feb 24 2020

PRC031-127-241715-
/O.CON.TJSJ.FF.W.0001.000000T0000Z-200224T1715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Juan PR-Carolina PR-
1104 AM AST Mon Feb 24 2020

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 115 PM AST FOR SAN
JUAN AND CAROLINA MUNICIPALITIES...

At 1059 AM AST, Doppler radar continues to indicate heavy rain 
falling across the warned area. Up to two inches of rain have 
already fallen. Flash flooding is already occurring. Emergency 
Managers repored flooding across portions of Isla Verde, Condado and 
Villamar in Carolina.

HAZARD...Flash flooding caused by heavy rain. 

SOURCE...Radar indicated. 

IMPACT...Flooding of small creeks and streams, urban areas, 
         highways, streets and underpasses as well as other drainage 
         and low lying areas. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 1842 6593 1837 6594 1841 6608 1846 6608

FLASH FLOOD...RADAR INDICATED

$$

oms

299 
WGCA72 TJSJ 241528
FFSSJU

Flash Flood Statement
National Weather Service San Juan PR
1128 AM AST Mon Feb 24 2020

PRC031-127-241715-
/O.CON.TJSJ.FF.W.0001.000000T0000Z-200224T1715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Juan PR-Carolina PR-
1128 AM AST Mon Feb 24 2020

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 115 PM AST FOR SAN
JUAN AND CAROLINA MUNICIPALITIES...

At 1125 AM AST, heavy rain is occurring. Flash flooding is already 
occurring. Emergency Managers reported flood along Ave Roberto 
Clemente and Ave Fragoso as well as Road 874. Flood along other 
minor roads is also occurring.   

HAZARD...Life threatening flash flooding. Heavy rain producing flash 
         flooding. 

SOURCE...Radar indicated. 

IMPACT...Life threatening flash flooding of creeks and streams, 
         urban areas, highways, streets and underpasses.The Flash 
         Flooding is capable of producing unusual severity. Action 
         is needed to protect live and property. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 1842 6593 1837 6594 1841 6608 1846 6608

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

oms

896 
WGCA72 TJSJ 241710
FFSSJU

Flash Flood Statement
National Weather Service San Juan PR
110 PM AST Mon Feb 24 2020

PRC031-127-241716-
/O.EXP.TJSJ.FF.W.0001.000000T0000Z-200224T1715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Juan PR-Carolina PR-
110 PM AST Mon Feb 24 2020

...THE FLASH FLOOD WARNING FOR SAN JUAN AND CAROLINA MUNICIPALITIES
WILL EXPIRE AT 115 PM AST... 

Although the heavy rain has ended, some light to moderate rains will 
continue to prevail across San Juan and Carolina municipalities 
resulting in ponding of water on roadways. Please continue to heed 
any remaining road closures. 

LAT...LON 1842 6593 1837 6594 1841 6608 1846 6608

$$

oms

Area Forecast Discussion
National Weather Service San Juan PR
457 AM AST Mon Feb 24 2020

.SYNOPSIS...

A weak frontal boundary across the Atlantic waters is causing
showers across the local waters. The frontal boundary will
continue to produce showers across the local waters today; this
activity will then spread inland during the afternoon. High
pressure will move over the region by mid-week and hold through
Sunday. The high pressure will cause relatively tranquil weather,
however an isolated showers can't be ruled out during the
afternoon. Sunday, another frontal boundary is expected to move
close to the area, and bring an end to the relatively tranquil
weather for Puerto Rio and the U.S. Virgin Islands.

&&

.SHORT TERM...Today through Wednesday...

A frontal boundary is providing plenty of moisture across the
islands. This front will linger and dissipate over the region
through the short term. Although there is high uncertainty about
where is going to be observed the rain activity, the available
moisture will result in cloudy skies and rainy conditions across
many parts of the islands. However, this activity should remain
mainly over the waters, and from the northwest to northeast portions
of Puerto Rico and the northern U.S. Virgin Islands. Shower activity
will spread across the interior and southern sections by mid-morning
into the afternoon hours. The less potential to observe rain
activity is in St Croix. Therefore, we are forecasting fair weather
for them. As the day progresses, the available moisture in
combination with surface convergence and mountain effects, will aid
in the development of afternoon showers over the interior, west and
northern half of PR. Under light steering winds periods of prolonged
moderate to locally heavy rains will lead to urban and small stream
flooding across portions of the islands.

As the aforementioned frontal boundary dissipate, a surface high
pressure which is forecast to move eastward into the Central
Atlantic Ocean will promote an advective pattern by Wednesday.
Therefore, winds will return from the east and the typical trade
wind showers.

&&

.LONG TERM...Thursday through Tuesday...

Relatively stable weather is prog to prevail through most of the
long-term period as a result of ridging at the surface and aloft.
As the ridges hold across the area, they will also transport a
drier air across Puerto Rico and the U.S. Virgin Islands, and
increase the trade wind cap through Saturday Afternoon. However,
moisture confined between 1000 to 700 MB, local, and diurnal
effects could produce a few showers during the afternoon. Showers
that do develop will be short-lived and produce light rainfall
amounts.

Saturday will be a transition day as a frontal boundary across the
western Atlantic begins to weaken the surface and mid-level
ridge, which will allow moisture to slide underneath the ridges.
The moisture increase will aid in the development of showers
during the early morning across eastern and northern Puerto Rico,
and the U.S. Virgin Islands. Then showers across the western and
interior during the afternoon. Sunday, a short-wave, and jet-steak
are forecast to round the best of the trough mentioned above. As
a result, the frontal boundary will continue to move south and
near the local waters late Sunday night into Monday morning.

The GFS shows the frontal boundary draped over Puerto Rico by Monday
afternoon, and lingering through Tuesday morning. Additionally,
the GFS shows precipitable water values ranging from 1.5 to 2.0
inches Monday through early Tuesday morning. The moisture
increase, low-level convergence, adequate instability, and
northerly wind flow will aid in the development of scattered to
numerous showers Monday through Tuesday morning.

By Tuesday afternoon, current guidance shows the frontal boundary south
of Puerto Rico, and precipitable water values decreasing
throughout the day. Nevertheless, lingering moisture will combine
with local and diurnal effects to induce scattered to isolated
showers during the afternoon. At this time, thunderstorm
development looks bleak due to warm 500 MB temperatures and
limited upper-level divergence over Puerto Rico and the U.S.
Virgin Islands. However, a few isolated thunderstorms may develop
across the Atlantic, and Caribbean waters were current guidance
has the highest upper-level divergence.

&&

.AVIATION...

SHRA/-SHRA will affect the terminals of N/W-PR/St Thomas
as a frontal boundary stall near the region. Therefore, expects
ceilings btwn FL030-FL070 at JBQ/JMZ/JSJ/IST through much of the
fcst period. SHRA will slowly move into the interior and S-PR after
24/15z, impacting JPS. ISX/NCM/KPK can expect tranquil weather
conditions. Winds will continue light and VRB, increasing around 10
knots with a NE component and sea breeze variations after 24/13z.
S/SW component.

&&

.MARINE...

A northerly swell and winds up to 20 kts will cause hazardous
seas through the middle of the week. There is a small craft
advisory in effect for the Atlantic waters, Mona Passage, Anegada
Passage and the northern near-shore waters of Puerto Rico.
Additionally, there is a high risk of rip currents for the
northern, eastern and western beaches of Puerto Rico. Also, there
is a high risk of rip currents for Saint Thomas, Saint John and
the beaches of Culebra. Winds will be from the northeast to east-
northeast ranging from 10 to 20 kts.

&&

.PRELIMINARY POINT TEMPS/POPS...
SJU  82  73  82  73 /  70  40  60  50
STT  83  73  83  74 /  10  50  50  20

&&

.SJU WATCHES/WARNINGS/ADVISORIES...
PR...High Rip Current Risk through late Tuesday night for Culebra-
     Mayaguez and Vicinity-North Central-Northeast-Northwest-San
     Juan and Vicinity-Southeast.

     High Rip Current Risk until 6 AM AST early this morning for
     Southwest.

VI...High Rip Current Risk through late Tuesday night for
     St.Thomas...St. John...and Adjacent Islands.

AM...Small Craft Advisory until 6 AM AST Wednesday for Coastal Waters
     of Northern Puerto Rico out 10 NM.

     Small Craft Advisory until 2 AM AST Thursday for Atlantic Waters
     of Puerto Rico and USVI from 10 NM to 19.5N.

     Small Craft Advisory until 8 PM AST Tuesday for Coastal Waters
     OF Northwestern Puerto Rico out 10 NM-Coastal Waters of
     Northern USVI and Culebra out 10 NM.

     Small Craft Advisory from 8 AM this morning to 8 PM AST this
     evening for Anegada Passage Southward to 17N.

     Small Craft Advisory until 8 PM AST this evening for Coastal
     Waters OF Southwestern Puerto Rico out 10 NM.

     Small Craft Advisory until 2 AM AST Wednesday for Mona Passage
     Southward to 17N.

&&

SHORT TERM...CAM
LONG TERM....TW
PUBLIC DESK...CAM

Perspectivas sobre Condiciones Peligrosas del Tiempo
Servicio Nacional de Meteorologia San Juan PR
908 AM AST lunes 24 de febrero de 2020

AMZ710>745-PRZ001>013-251000-
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 mar afuera del
Atlantico y Caribe-
908 AM AST lunes 24 de febrero de 2020

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

.Dia Uno...Hoy y esta noche

.Inundaciones...Lluvias fuertes pudieran resultar en inundaciones
urbanas y de riachuelos.

.Viento...Vientos sostenidos en exceso a las 20 mph a traves de las
aguas del Atlantico, el Pasaje de la Mona y sectores de la costa
norte de Puerto Rico.

.Oleaje...Se espera oleaje vigoroso de hasta 10 pies a traves de las
aguas del Atlantico y los Pasajes del Caribe. Se esperan olas
rompientes de entre 10 a 14 pies a traves de la costa norte de
Puerto Rico y Culebra.

.Corrientes marinas...Existe riesgo alto de corrientes marinas para
las costas desde el noroeste al noreste de Puerto Rico y Culebra.

.Dias dos hasta el siete...martes a domingo

Una marejada del noroeste creara condiciones maritimas peligrosas
con riesgo alto de corrientes marinas hata al menos el miercoles. El
potencial de aguaceros se mantendra alto hasta al menos el martes
por el paso de los remanentes de un frente frio. Inundaciones
urbanas y de riachuelos son posibles a traves de sectores de Puerto
Rico con la lluvia mas fuerte.

.Comunicado sobre informacion reportada por observadores...

No se anticipa activacion amplia de observadores. Sin embargo, se
les exhorta a los observadores individuales a reportar corrientes
marinas al Servicio Nacional de Meteorologia en San Juan.

AMZ715-725-VIZ001-002-251000-
San Tomas, San John y Islas Adyacentes-Santa Cruz-
Aguas cercanas del Atlantico y aguas costeras adyacentes
del Caribe-
908 AM AST lunes 24 de febrero de 2020

Esta perspectiva sobre las condiciones peligrosas del tiempo es para
Islas Virgenes Estadounidenses y las aguas costeras adyacentes.

.Dia uno...Hoy y esta noche

.Viento...Vientos sostenidos en exceso a las 20 mph a traves de las
aguas del Atlantico y el Pasaje de la Mona.

.Oleaje...Se espera oleaje vigoroso de hasta 10 pies a traves de las
aguas del Atlantico y los Pasajes del Caribe. Se esperan olas
rompientes peligrosas entre 10 a 14 pies a traves de la costa norte
de San Thomas y San John.

.Corrientes marinas...Existe riesgo alto de corrientes marinas para
las playas del norte de San Thomas.

.Dias dos hasta el siete...martes a domingo

Una marejada del noroeste creara condiciones maritimas peligrosas
con riesgo alto de corrientes marinas hata al menos el miercoles. El
potencial de aguaceros se mantendra alto hasta al menos el martes
por el paso de los remanentes de un frente frio.

.Comunicado sobre informacion reportada por observadores...

No se anticipa activacion amplia de observadores. Sin embargo, se
les exhorta a los observadores individuales a reportar corrientes
marinas al Servicio Nacional de Meteorologia en San Juan.