Sunday, June25, 2017

Marine Weather and Tides
Arroyo, PR

Version 3.4
What's New / NOTES
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
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.

Sunrise 5:19AMSunset 6:07PM Sunday June 25, 2017 2:54 AM CST (08:54 UTC) Moonrise 9:14AMMoonset 7:52PM Illumination 2% Phase: Waxing Crescent; Moon at 1 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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7 Day Forecast for Marine Location Near Arroyo, PR
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location: -34.81, -58.22     debug

Area Discussion for - San Juan, PR
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Fxca62 tjsj 250049
area forecast discussion
national weather service san juan pr
849 pm ast Sat jun 24 2017

Update The combination of diurnal heating and local effects
produced scattered showers and a couple of thunderstorms during
the afternoon hours across northwestern sections of puerto rico.

Isolated to scattered showers were also detected over the southern
portions of the metropolitan area. This activity produced brief
periods of moderate to heavy rainfall over those sections of
puerto rico. Some showers were also detected over the waters
between puerto rico and the u.S. Virgin islands. The upper level
ridge is expected to erode late Sunday night and Monday, allowing
more moisture transport across the local islands. For the
overnight and early Sunday morning, brief isolated to scattered
passing showers embedded in the easterly trades are expected to
move westward affecting the u.S. Virgin islands, vieques, culebra
as well as the eastern sections of puerto rico. For Sunday afternoon,
this moisture will combine with daytime heating and local effect
to produce a round of showers across western interior, and
northwest puerto rico. A tropical wave is expected to reach the
region late Sunday night and early Monday, resulting in an
increase in cloudiness, showers and possible thunderstorms across
the region. A saharan air layer is forecast to reach the local
islands early next week.

Aviation MainlyVFR conditions expected at all TAF sites
overnight except for passing vcsh across the leewards and u.S.V.I.

Taf sites. E-se winds of 10 knots or less expected until 25 14z
increasing to 15-20 knots after that. Brief periods of MVFR
possible over tjmz and tjbq after 25 18z due to diurnally induced
shra isold tsra.

Marine Mariners can expect seas of 3-5 ft and winds of 10-20 kts
across the regional waters. Moderate risk of rip current will continue
across parts of the north and southeast coast beaches of puerto
rico, culebra and vieques as well as in st. Croix.

Prev discussion issued 408 pm ast Sat jun 24 2017

diurnally induced shower activity will diminish by sunset, leaving
partly cloudy to mostly clear skies. Few passing showers will
continue to move across the coastal waters and may reach the
windward side of some islands during the over night hours. The
chance for showers and thunderstorms will increase across the
region late Sunday through Monday , as a tropical wave will move
across the eastern caribbean, and a tutt low develops northeast of
the region. Lesser activity is expected on Tuesday and Wednesday
except for locally induced afternoon showers and isolated
thunderstorms mainly over the west sections of puerto rico. Hazy
conditions will also be likely as an extensive saharan air layer
will trail the tropical wave.

Short term... Today through Monday...

a surface high pressure will continue to dominate the region during
the rest of the weekend. Under this pattern... Trade wind showers and
shallow low level clouds will reach the local islands and coastal waters
at times. A tropical wave is forecast to affect the local region Sunday
night through Monday. A tutt low is also forecast to develop and relocate
just northeast of the region while higher pressure ridge gradually
erodes aloft. As a result, an increase in cloudiness with showers and
thunderstorms is expected across coastal waters, puerto rico and the
u.S. Virgin islands. Drier air is expected to filter in as saharan
dust trailing the tropical wave will quickly spread across the region
by Monday evening. This should then limit the shower activity across
the islands and coastal waters.

Long term... Tuesday through Sunday...

as the tropical wave moves away from the local isles late Monday and
into Tuesday, low level moisture is expected to decrease across the
forecast area. However, afternoon showers with a few thunderstorms
are still expected mainly across west puerto rico Tuesday and Wednesday
due to local effects and diurnal heating. Hazy skies are also possible
during those days as an extensive saharan air layer will spread across
the region trailing the tropical wave. Good pooling of tropical moisture
is so far expected across the region by Thursday and through the early
part of the upcoming weekend, as another tropical wave is forecast to
enter and moves across the eastern caribbean. This should again bring
a moist and unstable weather pattern to the forecast area.

Aviation...VFR conds expected at all TAF sites except tjbq and vcty
tjmz where brief MVFR conds are possible thru 22z due to diurnally induced
shra isold tsra. Elsewhere... Vcsh possible at times. E-se sfc wnds of
15-20 kts will prevail bcmg 5-10 kts aft 23z. Passing shra en route
btw islands and over coastal waters durg prd... Few tops btw fl080-fl100.

Marine... Mariners can expect seas of 3-5 ft and winds of 10-20 kts
across the regional waters. Moderate risk of rip current will continue
across parts of the north and southeast coast beaches of puerto rico,culebra
and vieques as well as in st. Croix.

Preliminary point temps pops
Sju 77 89 78 87 40 20 40 50
stt 79 90 79 87 20 20 50 50

Sju watches warnings advisories
Pr... None.

Vi... None.

Am... None.

Short term... Jf
long term... .Ram

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Wind Forecast for (4,6,7,8)
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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.