Tuesday, October22, 2019 L-36.com

Marine Weather and Tides
Rinc�n, PR

Version 3.4
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:28AMSunset 6:07PM Tuesday October 22, 2019 8:03 PM AST (00:03 UTC) Moonrise 12:43AMMoonset 2:10PM Illumination 31% Phase: Waning Crescent; Moon at 24 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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AMZ742 Coastal Waters Of Northwestern Puerto Rico Out 10 Nm- 414 Pm Ast Tue Oct 22 2019
Tonight..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 11 seconds. Isolated showers.
Wednesday..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 8 seconds. Scattered showers through the day. Isolated Thunderstorms in the afternoon.
Wednesday night..East winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 11 seconds. Isolated showers.
Thursday..East winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 10 seconds. Numerous showers through the day. Isolated Thunderstorms in the afternoon.
Thursday night..East winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 10 seconds.
Friday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Scattered showers.
Saturday..Northeast winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Scattered showers.
Sunday..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 12 seconds. Northeast swell 4 to 5 feet. Scattered showers and isolated Thunderstorms.
AMZ700 414 Pm Ast Tue Oct 22 2019
Synopsis for puerto rico and the uS. Virgin islands waters... Tranquil marine conditions with seas below 5 feet and east winds up to 15 knots are forecast to prevail across the local waters through the week into the weekend. Weather conditions will continue to be active over the next couple of days with showers and possible Thunderstorms moving over the waters each afternoon, especially along the west and southwest coasts of puerto rico. In the mornings, showers and isolated Thunderstorms are likely in the northern and eastern waters. A large swell from the northwest with wave heights to 8-9 ft is forecasted to occur early next week.

7 Day Forecast for Marine Location Near Rinc�n, PR
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location: 19.03, -68.44     debug

Area Discussion for - San Juan, PR
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Fxca62 tjsj 221734
area forecast discussion
national weather service san juan pr
134 pm ast Tue oct 22 2019

Showers and thunderstorms have developed over interior and
southwestern puerto rico, with locally heavy rain; further
development is possible through the afternoon. Streamers have
also developed off of the major islands to the east of mainland
puerto rico. Tomorrow, a similar pattern is expected, but with
increased instability and therefore a higher potential for more
thunderstorms, as well as more widespread showers. Additionally,
the mean flow over the area is expected to shift to more easterly,
which could shift the location of the maximum shower activity to
be more in western puerto rico than southwestern, though other
areas will still likely see showers. There is the potential for
urban and small stream flooding associated with this shower and
convective activity for the next couple of days. During the
overnight hours into the morning, scattered showers, especially
over the waters and northern northeastern puerto rico, are
anticipated, and there is the potential for isolated

Short term Today through Tuesday...

this afternoon, a tutt stretching across the region from the
northeast is in the process of forming a cutoff upper level low.

This low will begin to make its way to the southwest to over or just
south of hispaniola. While this will likely not have a significant
impact on conditions this afternoon, it is anticipated to cause
increased instability, and thus enhance shower and convective
activity as it moves away to the west. This afternoon will see
continuing development of showers and thunderstorms, especially in
southwestern and interior puerto rico; there is a continuing risk
of locally heavy rainfall and the potential for urban and small
stream flooding. Tonight is forecast to be similar to last night,
with popcorn showers over the waters, and some showers in northern
and northeastern puerto rico, as well as some over the u.S.

Virgin islands. Tomorrow, winds are expected to veer to out of the
east during the day. With the enhanced instability, and
continuing near-normal levels of moisture over the region, an
increase in shower and thunderstorm activity from local effects
and daytime heating is forecast for the afternoon. Western and
interior puerto rico are likely to see the highest level of
activity, but other areas will still have a good chance to see at
least some showers on the day.

The effects of the upper level low will continue over the area on
Thursday, and therefore showers and thunderstorms are likely again;
with the low moving away, however, this activity is expected to
decrease somewhat. With winds forecast to be out of the east southeast,
the maximum activity will likely be in western, northwestern, and
interior puerto rico.

Long term Friday through Tuesday... From prev discussion...

a relatively moist weather pattern is expected through at least
midday Monday with near-average GFS model-estimated precipitable
water vapor values between 1.6 and 2.0 inches holding across the
region. On Friday, the combination of lingering moisture from a
departing surface induced trough and somewhat favorable conditions
aloft due to a meandering tutt low to the northwest will support
a generally convective pattern. Then, a meandering surface high
pressure over north atlantic will drive the remnants of a frontal
boundary into the local area by Saturday and Sunday. Another
surface induced trough is forecast to move into the region late
Sunday into Monday, increasing low-level convergence and bursting
precipitable water vapor values over 2.0 inches. Thereafter, a
gradual drying trend is expected and local weather conditions will
depend in the timing of trade wind patches of dry and moist air
moving across the forecast area from the east-northeast. In the
meantime, another cutoff tutt low is forecast to approach the
northeastern caribbean from the east. The convergent subsidence
side of the latter will move over the forecast area on Monday and
Tuesday, resulting in unfavorable conditions aloft and limiting
shower and thunderstorm development across the region.

Shra tsra expected across portions of interior, western,
and southern pr through 22 22z, affecting the vicinity of tjmz tjps.

Tempo MVFR conditions are possible. Elsewhere, sct shra could result
in vcsh at times across the leeward islands, usvi, and tjsj
terminals. However, no significant impacts to operations are
expected at this time. Low-level winds will continue out of the ene
between 10 and 15 kts with sea breeze variations through 22 22z,
becoming light and variable overnight.

Relatively tranquil seas are expected to continue through the week
and into the weekend, with wave height below 5 feet. Prevailing
winds persist out of the northeast east-northeast today, veering to
more easterly tomorrow, with speeds up to 15 knots. Showers and
isolated thunderstorms will continue this afternoon, especially
around southwestern puerto rico and downwind of the major islands
east of mainland puerto rico. Tonight into tomorrow morning, popcorn
showers are expected over the waters, similar to this morning.

Showers and isolated thunderstorms are likely again each afternoon
for the next few days. There remains a low to moderate risk of rip
currents at north-facing beaches of puerto rico, culebra, and st.

Thomas today, as well as tomorrow.

Preliminary point temps pops
Sju 88 77 88 77 60 60 50 50
stt 88 78 87 77 30 30 60 60

Sju watches warnings advisories
Pr... None.

Vi... None.

Am... None.

Short term... Gl
long term... .Crs

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MISP4 - 9759938 - Mona Island, PR 70 mi45 min 81°F 86°F1013 hPa
MGZP4 - 9759394 - Mayaguez, PR 88 mi51 min 86°F1013.2 hPa

Wind History for Mayaguez, PR
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1 day
2 days

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Aquadilla, Rafael Hernandez Airport, PR78 mi73 minSE 810.00 miThunderstorm in Vicinity79°F71°F79%1012.9 hPa

Link to 5 minute data for TJBQ

Wind History from JBQ (wind in knots)
Last 24hrE7------------------CalmE4E8E7E8E6E6E9E11E9E4E5SE8SE5
1 day agoS3SE3CalmSE55SE3----------SE3E7E9E11E9
2 days agoCalm------------------SE4SE4E9E11E12NE15NE14E14

Tide / Current Tables for Mona Island, Puerto Rico
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Tide / Current Tables for Aguadilla, Crashboat Beach, Puerto Rico
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Weather Map
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GEOS Local Image of Puerto Rico    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (20,4,5,8)
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Ground Weather Radar Station Puerto Rico,Virgin Islands
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weather_mapweather_map weather_map

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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.