Marine Weather and Tides
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
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|Sunrise 5:22AM||Sunset 5:53PM||Wednesday April 26, 2017 5:51 AM CST (11:51 UTC)||Moonrise 7:18AM||Moonset 6:46PM||Illumination 0%|
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7 Day Forecast for Marine Location Near Arroyo, PRHourly EDIT Help
Area Discussion for - San Juan, PR  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxca62 tjsj 260918|
area forecast discussion
national weather service san juan pr
518 am ast Wed apr 26 2017
Synopsis Ridge at the surface across the atlantic will continue
for the next several days. Southeast winds continue through
Thursday, becoming east-northeast through next week. Upper ridge
builds west of the area and across the central caribbean. Tutt
develops northeast of the area during the weekend and persist
through early next week.
Short term Wednesday through Friday...
mostly cloudy skies prevailed overnight and early this morning
across the local islands. Showers were observed across the regional
waters as well as over coastal municipalities of puerto rico.
Rainfall accumulations associated with these showers were between
one and three inches. Temperatures were in the upper 70s to low 80s
at the lower elevations.
Although the upper level trough across the central atlantic and into
the northeast caribbean will continue to shift east and away from the
forecast area today, another trough aloft, a tutt, is expected to
establish north of the area by Friday. At lower levels, a moist
southeasterly wind flow will continue to prevail today, becoming
more easterly Thursday and into the upcoming weekend as a surface
high across the north central atlantic relocates across the central
atlantic. Latest guidance continues to suggest a decrease in
precipitable water during the next two days or so, but remaining
above the normal range.
As a result, continue to expect passing showers across the coastal
areas of puerto rico as well as usvi during the morning hours with
shower and thunder activity increasing across the forecast area in
the afternoon. These showers and thunderstorms are expected mainly
across the northwest quadrant of the island as well as portions of
the san juan metro area. With the heaviest showers, urban flooding
likely. A similar pattern should prevail Thursday and Friday,
although morning showers will be focused across E pr and usvi.
Long term Saturday through Thursday...
tutt pattern to the northeast is expected to provide instability
across the area to aid the development of showers and possible|
isolated thunderstorms during Saturday afternoon across the
interior and western portions of pr. Pwat content erodes quickly
on Sunday and best moisture content remains below 800 mb through
the end of the forecast period. This in response to trade wind cap
as ridge pattern dominates the western atlantic. Therefore, best
chances for showers are during the weekend across the islands.
During the week, limited shower activity is expected across the
region... With brief periods of trade wind showers across the
usvi's and the north and eastern portions of pr at times and
localized afternoon shallow convection over west/southwest pr.
Aviation Vfr conds expected to prevail this morning at the
leeward and usvi terminals with shra possible in and around jsj.
Shra/tsra development expected aft 26/16z to result in brief periods
of MVFR conds in and around jbq/jmz and possibly jsj through 26/22z.
Southeasterly winds at 10 to 15 knots with sea breeze variations,
becoming light and variable overnight.
Marine Coastal buoys across the islands are indicating seas
between 2-4 feet and east-southeast winds at 5-10 knots. Higher
gusts were observed with showers and thunderstorms across the
atlantic waters and the southwestern coastal waters of puerto
rico. Seas should continue between 3-5 feet and east to
southeasterly winds up to 15 knots. Moderate risk of rip currents
continue for the northern and southern coasts of the islands.
Preliminary point temps/pops
Sju 90 77 87 76 / 30 30 30 30
stt 86 76 86 76 / 40 30 30 30
Short term... Om
long term... .Ds
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