Tuesday, January16, 2018 L-36.com

Marine Weather and Tides
Arroyo, PR

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
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 6:02AMSunset 5:38PM Tuesday January 16, 2018 3:23 AM CST (09:23 UTC) Moonrise 5:30AMMoonset 7:51PM Illumination 0% Phase: New Moon; Moon at 29 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 160836
area forecast discussion
national weather service san juan pr
436 am ast Tue jan 16 2018

Synopsis A mid to upper level ridge will gradually build from
the west and hold through the end of the week. Broad surface high
pressure across the north central atlantic will continue to
slowly weaken and move over the azores on Wednesday. A weak
surface high build across the western atlantic during the weekend.

Moderate trades will continue for the next several days.

Short term Today through Thursday... Cloudiness with showers were
noted across the local coastal waters and the eastern half of puerto
rico, and the u.S. Virgin islands. A patch of low level moisture
embedded in the trade winds was affecting the region early this
morning. This area of moisture will continue to move west and will
produce isolated to scattered showers across most of the area this
morning and into this afternoon. For Wednesday, this weather pattern
will continue as more patches of low level moisture moves across the

High pressure system across the central atlantic will continue to
dominate the local area through at least Thursday. Although a slot
of drier air is anticipated for Thursday, moisture content will
remain steady through the forecast period, with precipitable water
values remaining between 1.5 to 1.6 inches. Surface winds will
continue mainly east to east northeast at times.

Long term Friday through Tuesday...

no major change from previous forecasts, as trade wind showers
will continue through the forecast period. Each afternoon, the
limited available moisture content and the local effects will
result in the development of showers over portions of the
west western interior sections of puerto rico. Across the usvi
and eastern pr, streamers are expected to develop early in the
afternoon hours and continue to leave mainly minor rainfall
amounts over land areas. As a surface high pressure moves into the
western atlantic, winds will shift more from the east- northeast
and passing trade wind showers will focus across the local
atlantic waters and over the north northeast sections of pr and
the northern usvi.

Aviation MainlyVFR conditions expected throughout most of the
forecast period. However, trade wind showers could move in across
the leeward usvi eastern pr terminals at times. Afternoon shra
development is expected over the western pr terminals with MVFR
conditions possible briefly. Low level winds will continue mainly
from the east between 10-20 kts.

Marine Northeast swell will continue to result in hazardous
seas across the atlantic waters and across portions of the local
passages and the offshore caribbean waters. Moderate easterly
winds will continue through the end of the week between 5-15 kts.

A high risk of rip currents will continue through at least
Wednesday afternoon across the atlantic beaches of puerto rico,
culebra and st. Croix.

Preliminary point temps pops
Sju 82 74 84 74 50 40 50 40
stt 84 74 84 74 50 40 40 20

Sju watches warnings advisories
Pr... High rip current risk through Wednesday afternoon for north
central-northeast-northwest-san juan and vicinity-southeast-
western interior.

High rip current risk through this afternoon for culebra.

Vi... High rip current risk through Wednesday afternoon for st croix.

Am... Small craft advisory until 2 am ast Wednesday for caribbean
waters of puerto rico from 10 nm to 17n-coastal waters of
northern usvi and culebra out 10 nm-coastal waters of
southern usvi vieques and eastern puerto rico out 10 nm.

Small craft advisory until 2 pm ast Wednesday for anegada
passage southward to 17n-atlantic waters of puerto rico and
usvi from 10 nm to 19.5n-coastal waters of northern puerto
rico out 10 nm-mona passage southward to 17n.

Short term... Fc
long term... .Ds

Weather Reporting Stations
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Airport Reports
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Tide / Current Tables for
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Weather Map and Satellite Images
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Weather Map
IR Satellite Image from GEOS

GOES Local Image of Puerto Rico    EDIT

Wind Forecast for (4,6,7,8)
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Ground Weather Radar Station Puerto Rico,Virgin Islands
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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 L-36.com. 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 L-36.com 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.