A band of moisture associated with an old frontal boundary enhanced shower activity over interior PR resulting in the issuance of flood advisories for that area.
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The episode as NWS SJU wrote it up.
A band of moisture associated with an old frontal boundary enhanced shower activity over interior PR resulting in the issuance of flood advisories for that area.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS San Juan, PR wrote its last area forecast discussion before the first event at Apr 2, 9:05 PM AST, 21 minutes earlier.
Area Forecast Discussion
National Weather Service San Juan PR
905 PM AST Sun Apr 2 2017
.UPDATE...Partly cloudy skies were observed early in the evening
across Puerto Rico, USVI as well as across the surrounding waters.
Scattered to numerous showers developed by mid afternoon along the
mountain rain of Puerto Rico, affecting municipalities over
central interior Puerto Rico. A flood advisory was issued for
several municipalities across these section of Puerto Rico.
Accordingly to USGS rain gages, more than 2 inches of
precipitation were measured at Utuado, Orocovis, and Comerio.
The shower activity along the mountain ranges was tapered off
just after sunset. Across the USVI, mostly fair weather prevailed
without any significant rainfall amounts over land areas. Overall
fair weather conditions and clear to partly cloudy skies are
expected to continue overnight and early Monday morning across all
islands. Only light passing showers are possible across eastern
and northeastern sections of Puerto Rico, Vieques, Culebra and the
U.S. Virgin Islands overnight. However, for Monday afternoon
another round of shower development is expected as the available
moisture combines with local effects, diurnal heating and sea
breeze convergence. A broad upper level ridge will limit the
intensity of the convection and the development of thunderstorms,
but moderate to locally heavy showers are possible.
&&
.AVIATION...Mostly VFR conditions are expected overnight and until
at least 03/14Z across the local flying area. After 03/18Z,
Afternoon convection is again possible, which would cause VCSH
near TJMZ and TJPS. Winds will be light and variable overnight,
but are expected to become from the E to ENE early in the morning.
VCSH are possible across the USVI terminals as well as TJBQ and
TJSJ on occasion early in the morning.
&&
.MARINE...Seas will continue to recede tonight and Monday. Seas up to 7
feet are expected across the Atlantic waters this evening but will
decrease to 6 feet early Monday morning. There is a High Risk of
Rip Currents for northwest to northeast facing beaches of Puerto
Rico and for Vieques and Culebra until early Monday morning. There
is a high risk of rip current for St Thomas and St. John also
until early Monday morning.
&&
.PREV DISCUSSION... /issued 342 PM AST Sun Apr 2 2017/
SYNOPSIS...A band of moisture associated with an old frontal
boundary will enhance shower activity mainly over the interior of
Puerto Rico Monday and Tuesday. Drier air will filter in from the
north and northeast beginning late Tuesday as high pressure moves
into the central Atlantic. Moisture will begin to return next
Sunday when a strong cold front pushes into Hispaniola.
SHORT TERM...Today through Tuesday...
The surface high pressure to the northeast of the local area
continues to weaken as another surface high pressure moves into
the western Atlantic to the north northwest of the local area.
Afternoon shower development is expected over PR after the
available moisture combines with the local effects and diurnal
heating. Broad high pressure in the upper levels should limit the
intensity of the convection, keeping the chances of thunderstorms
fairly low since there is not a whole lot of upper level support
for thunderstorms at the moment. However, moderate to locally
heavy showers are very possible.
For this afternoon, the local effects and diurnal heating have
combined with the available moisture to cause showers in Puerto
Rico's interior. With normal moisture and abundant sun urban and
small stream flooding will be likely despite relatively dry mid
levels. But by tonight, most of the locally induced showers will
have dissipated, leaving only brief showers to affect the north
and eastern sections of PR in the overnight hours.
The local winds will turn more east northeast tonight, but we can
expect isolated morning showers across the USVI and the northern
and eastern sections of PR. Afternoon showers will again develop
across the interior into the western sections of PR when the local
wind flow combines with the local effects and available moisture,
similar to what we expect for today including locally heavy
showers and the possibility of urban and small stream flooding,
but with the ENE winds and slightly breezier conditions, the
temperatures should remain in the mid 80s for the northern coast
including the San Juan airport and the USVI. It will be warmer in
the south and western sections of PR.
Latest guidance suggests that a patch of moisture could be passing
through the local area on Tuesday with the ENE winds still prevailing
over the area. Showers will be isolated in the morning but during
the afternoon shower development is once again expected to be
locally induced, so the interior and western sections of PR have a
chance of showers, while there is only a slight chance of showers
across the USVI.
LONG TERM...Wednesday through Tuesday...
A broad ridge is found entrenched over northern South America and
the central Caribbean on Wednesday. It slowly drifts east and
through Puerto Rico and the U.S. Virgin Islands by Friday morning
with relatively dry weather and sparse showers. Its passage opens
the way for a deep trough to leave Florida and move to Hispaniola
by the following Tuesday accompanied by rapidly rising columnar
moisture Sunday through Tuesday and increasing probabilities for
showers. In fact, the tail of a weak jet will pass over Puerto
Rico and the USVI on Monday night.
AVIATION...VFR conds across the local terminals for the next 24
hours. Afternoon convection is possible, which would cause VCSH
near TJMZ, and TJPS. Winds will be from the ESE to SE at around 10
KT with sea breeze variations until around 03/00Z. Thereafter,
the winds will become more from the E to ENE and decrease to about
5 KT for the overnight period with trade wind SHRA causing VCSH
across the USVI terminals as well as TJBQ and TJSJ on occasion.
Maximum winds next 24 hours will be west around 60 knots at FL400.
MARINE...Seas are peaking now and are expected to fall fairly
rapidly overnight. Seas at buoy 41043 was almost 10 feet at 6 AM
AST, but have relaxed to 7.6 feet now. This will fall will be
reflected in our local waters shortly as swell are still from the
north. Another weaker pulse is expected to move in late Tuesday.
This episode will also be shorter and periods of the swell will be
shorter as well. Seas generally decline after Wednesday through at
least next Sunday though swell remains northerly. Easterly seas
and swell will increase gradually in the Caribbean through
Wednesday but are expected to be no more than 3 to 5 feet except
where north swell moves in through the wider passages.
&&
.PRELIMINARY POINT TEMPS/POPS...
SJU 76 86 75 85 / 20 20 20 20
STT 74 85 75 86 / 10 10 20 20
&&
.SJU WATCHES/WARNINGS/ADVISORIES...
PR...High Rip Current Risk until 6 AM AST Monday for Culebra-Mayaguez
and Vicinity-North Central-Northeast-Northwest-San Juan and
Vicinity-Southeast-Vieques-Western Interior.
VI...High Rip Current Risk until 6 AM AST Monday for St.Thomas...St.
John...and Adjacent Islands.
AM...High Rip Current Risk until 6 AM AST Monday for Coastal Waters
of Southern USVI Vieques and Eastern Puerto Rico out 10 NM.
Small Craft Advisory until 2 AM AST Monday for Anegada Passage
Southward to 17N-Atlantic Waters of Puerto Rico and USVI
from 10 NM to 19.5N-Coastal Waters OF Northwestern Puerto
Rico out 10 NM-Coastal Waters of Northern Puerto Rico out
10 NM-Mona Passage Southward to 17N.
High Rip Current Risk from 2 AM to 6 AM AST Monday for Coastal
Waters of Northern USVI and Culebra out 10 NM.
&&
SHORT TERM...JF
LONG TERM....WSPerspectivas sobre condiciones peligrosas del tiempo Servicio Nacional de Meteorologia San Juan PR 754 PM AST domingo 2 de abril de 2017 AMZ710>745-PRZ001>013-040000- 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 aguas mar afuera del Atlantico y aguas costeras del Caribe- 754 PM AST domingo 2 de abril de 2017 Esta perspectiva sobre las condiciones peligrosas del tiempo es para Puerto Rico y las aguas costeras adyacentes del Atlantico. .Dia uno...Esta noche .Corrientes Submarinas...Existe un riesgo alto de corrientes submarinas para las costas del norte de Puerto Rico, Vieques y Culebra. .Dias dos a siete...lunes a sabado Se espera riesgo de moderado a alto de corrientes submarinas hasta por lo menos el viernes. Hay potencial de inundaciones urbanas y de riachuelos durante las tardes mayormente a traves del centro de PR y especialmente el lunes y martes. .Comunicado sobre informacion reportada por observadores... No se anticipa activacion amplia de observadores, sin embargo se les exhorta a observadores a reportar inundaciones y corrientes submarians al Servicio Nacional de Meteorologia en San Juan. AMZ715-725-VIZ001-002-040000- San Tomas, San John e islas adyacentes- Santa Cruz-Aguas cercanas del Atlantico y aguas costeras adyacentes del Caribe- 754 PM AST domingo 2 de abril de 2017 Esta perspectiva sobre las condiciones del tiempo peligrosas es para Puerto Rico y las aguas costeras adyacentes del Atlantico. .Dia uno...Esta noche .Corrientes submarinas...Existe un riesgo alto de corrientes submarinas para las costas del norte de San Thomas. .Dias dos a siete...lunes a sabado Se espera riesgo de moderado a alto de corrientes submarinas hasta por lo menos el viernes. .Comunicado sobre informacion reportada por observadores... No se anticipa activacion amplia de observadores, sin embargo se les exhorta a observadores a reportar corrientes submarinas al Servicio Nacional de Meteorologia en San Juan.
The national radar mosaic for the moment the first event began.
1 heavy rain. Local standard time, as filed.
Official from 911 and Morovis Management Agency to report 10 people stranded near Quebrada El Almendro in Morovis due to heavy rains and runoff from afternoon rainfall.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Puerto Rico in 2017Every state in 2017This day in weather historyWarnings in Puerto Rico, April 2017
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 688400.