Marine Weather and Tides
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
|Sunrise 5:41AM||Sunset 6:58PM||Tuesday June 19, 2018 11:27 PM AST (03:27 UTC)||Moonrise 11:35AM||Moonset 12:00AM||Illumination 42%|
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7 Day Forecast for Marine Location Near Su�rez, PRHourly EDIT Help
Area Discussion for - San Juan, PR  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxca62 tjsj 200152|
area forecast discussion
national weather service san juan pr
952 pm ast Tue jun 19 2018
Update Showers with thunderstorms affected the east and
southeast sections of puerto rico tonight. An area of showers and
thunderstorms moved from the coastal waters through an area
between guayama and yabucoa. Rainfall accumulations were between
one to two inches in localized areas. Rivers and streams across
these area were running high as 930 pm ast. Showers and
thunderstorms are expected to diminish overnight. However, some
showers are expected to affect the local area fro time to time
Aviation MainlyVFR conditions will prevail across all taf
sites through at least 20 12z. Vcsh are expected across tjps
overnight. Low level winds will continue mainly southeast at less
than 10 kts.
Marine No changes from previous discussions. Showers and
thunderstorms are expected to continue across the coastal waters.
Prev discussion issued 350 pm ast Tue jun 19 2018
synopsis... Tropical wave moving south of the islands will
continue to result in showers and thunderstorms across the
regional waters and over portions of the islands through
Wednesday. Tutt north of the region will sink and move just north
of the islands during the weekend. Broad surface high pressure
will continue across the central and northeastern atlantic for
the next several days. This will continue to promote an east to
southeast wind flow over the region. Next tropical wave enters the
eastern caribbean on Friday.
Short term... Today through Thursday...
a tropical wave interacting with an upper level trough will
continue to aid in the development of showers and thunderstorms
across the regional waters and over the islands during the
overnight hours through at least Wednesday afternoon. Frequent
lightning was observed today with the thunderstorms that developed
over the coastal waters of the usvi and briefly over the north
central and northwestern sections of pr. Another round of
scattered to locally numerous showers and thunderstorms are
expected on Wednesday afternoon over the interior and western
sections of puerto rico. Drier air with saharan dust are expected
to fill from the east by Wednesday evening and continue through
Thursday. This will limit shower activity across the region and
shower development should be confined to the western sections of
pr in diurnally induced afternoon convection.
Long term... Friday through Wednesday... (from previous
the surface ridge will maintain its hold over the region with|
moderate to fresh easterly winds of 10 to 15 mph through the
period. A cut-off low to the north of puerto rico will continue to
move south until it reaches the northern portions of puerto rico
during the afternoon on Friday. At the same time a tropical wave
moves across the lesser antilles Friday morning, then affect the
u.S. Virgin islands during the afternoon, before arrive to puerto
rico later in the day. Due to the proximity of the upper level low
which will provide upper-level forcing, and the increase in low
level moisture due the approaching tropical wave; instability is
expected to increase over the area. Therefore, numerous to
scattered showers with isolated thunderstorms are expected through
the long-term period during the afternoon hours. Recent analysis
of the gdi shows values ranging from 35 to 40 which means theirs
potential for scattered thunderstorms with some having the
capability of producing heavy rain. The best upper level
divergence will be Saturday afternoon, as a result isolated
thunderstorms were put into the grids.
Sunday, the region will transition from a moist air mass to a
drier one as the tropical wave push east of the region as drier
air works in behind the the wave. The beginning of next week fair
weather returns with diurnal and locally induced showers during
the afternoon, mainly over the western portions of puerto rico.
Aviation... Shra tsra are expected to affect most of the local
terminal. MVFR or even ifr periods are expected at time over
tjsj tjbq tjmz tjps and tist tisx btwn 19 18-23z. Shra will continue
overnight across e-pr usvi. Tempo groups are in place for most of
the local TAF sites. Shra and tsra are expected to slowly dissipate
by late Wednesday afternoon. Winds are expected to continue from the
ese-se at 10 to 15 knots with sea breeze variations. Local stations
have been reporting gusty winds up to 30 kt with this activity.
Marine... Seas will continue to range between 3-5 feet and winds
will prevail from the east to southeast at 5-15 knots through at
least Thursday. Thunderstorms are expected overnight, mainly
across the caribbean waters and the coastal waters of the usvi.
A moderate risk of rip currents will continue on Wednesday across
the southern beaches of puerto rico and st. Croix.
Preliminary point temps pops
Sju 77 91 78 89 30 50 40 10
stt 80 87 80 89 50 30 20 10
Sju watches warnings advisories
Short term... Fc
long term... .Ds
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