Tuesday, April24, 2018 L-36.com

Marine Weather and Tides
Emajagua, PR

Version 3.4
What's New / NOTES
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.
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.

Sunrise 5:58AMSunset 6:43PM Tuesday April 24, 2018 8:16 AM AST (12:16 UTC) Moonrise 2:00PMMoonset 2:11AM Illumination 67% Phase: Waxing Gibbous; Moon at 9 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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AMZ735 Coastal Waters Of Southern Puerto Rico Out 10 Nm- 408 Am Ast Tue Apr 24 2018
.small craft should exercise caution...
Today..East winds 15 to 20 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers.
Tonight..East winds 15 to 20 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers through the night.
Wednesday..East winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Isolated showers.
Wednesday night..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers.
Thursday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Isolated showers.
Friday..East winds 15 to 20 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers.
Saturday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers.
AMZ700 408 Am Ast Tue Apr 24 2018
Synopsis for puerto rico and the uS. Virgin islands waters... Choppy seas are expected today across the local waters for the next several days with a moderate to fresh easterly wind. Isolated to scattered showers are expected across the local waters for the rest of the week.

7 Day Forecast for Marine Location Near Emajagua, PR
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location: 18, -65.88     debug

Area Discussion for - San Juan, PR
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Fxca62 tjsj 240826
area forecast discussion
national weather service san juan pr
426 am ast Tue apr 24 2018

Synopsis Enhanced amounts of moisture will linger into today
but drier air is expected to move in by late this afternoon. The
upper trough is expected to continue to move east through the
local islands and the axis should be to our east by this evening,
leaving the local islands in the subsident side of the upper
trough. Ridge aloft to prevail for the rest of the week along with
normal or slightly below normal moisture. Any afternoon shower
and thunderstorm activity for the rest of the week is expected to
be mainly due to local effects. Moderate easterly winds to
continue through the rest of the week.

Short term Today through Thursday...

cloudy skies prevailed across puerto rico and the u.S. Virgin
islands overnight. A line of showers moved across the eastern half
of puerto rico, with only light passing showers affecting the
southeast municipalities of puerto rico. Little shower activity was
observed over the u.S. Virgin islands. Low level moisture embedded
in the trade winds will continue to produce isolated light showers
across the region this morning. For this afternoon, the combination
of low level moisture, with daytime heating and orographic effects
will induce the development of showers with thunderstorms mainly
across the western interior and northwest sections of puerto rico.

In the u.S. Virgin islands, partly cloudy skies are expected with
some passing showers affecting the territory from time to time.

For late this afternoon into tonight, a slot of dry air will
encompass the region. As a result, limited shower activity is
expected tonight and Wednesday. For Thursday, another patch of low
level moisture will affect the region. In addition, a moist east
southeast wind flow will result in good chances for shower and
thunderstorm development mainly during the afternoon hours on

Long term Friday through Wednesday...

near normal moisture and upper ridge will cause a weather pattern
of some isolated to scattered brief showers across the local
waters, usvi and eastern pr during the overnight and early morning
hours. Afternoon shower and possible thunderstorm development will
be mainly due to local effects over pr. Therefore, the available
moisture will combine with the diurnal heating and sea breeze
convergence to cause some showers and possible thunderstorms. This
weather pattern can be expected through the weekend and into
early next week.

The very long range models started hinting at a significant
increase in moisture and in shower activity by next Wednesday as
a frontal boundary settles north of the local islands. This is way
too far into the forecast period and the confidence is very low.

We will continue to monitor but it would not be surprising if the
model guidance varies widely from today until that date arrives.

Aviation Vfr conditions will prevail across all TAF sites through
23 17z. Increasing cloudiness with shra tsra are expected across
tjsj, tjmz and tjbq from 24 18-24 22z. As a result, brief periods of
MVFR conditions can be expected. Low level winds will be mainly east
southeast at 10 to 15 kts.

Marine Seas are now at 6 feet or less and the winds are
expected to be up to 15 knots across most of the local waters with
some areas that could reach 20 knots. The local seas are expected
to remain up to 6 feet or less for the next several days. There is
a moderate risk of rip currents across many of the local beaches,
please refer to the local surf zone forecast for more information.

Preliminary point temps pops
Sju 84 75 89 76 40 20 20 40
stt 85 75 86 77 20 20 40 40

Sju watches warnings advisories
Pr... None.

Vi... High rip current risk until 6 am ast early this morning for st

Am... None.

Short term... Fc
long term... .Ja

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
YABP4 - 9754228 - Yabucoa Harbor, PR 5 mi46 min 81°F
JOXP4 - Jobos Bay Reserve, Puerto Rico 18 mi91 min NE 1.9 77°F 1017 hPa70°F
41056 29 mi46 min ENE 14 G 18 79°F 1017.4 hPa
SJNP4 - 9755371 - San Juan, PR 34 mi46 min 79°F 80°F1017.7 hPa
CLBP4 - 9752235 - Culebra, PR 37 mi46 min 79°F 81°F1017.2 hPa

Wind History for Yabucoa Harbor, PR
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1 day
2 days

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Juan, Luis Munoz Marin International Airport, PR30 mi81 minE 1010.00 miPartly Cloudy77°F71°F83%1017.3 hPa

Wind History from JSJ (wind in knots)
Last 24hrE6E9NE13E17NE17E13E15E7E16E9E8E12E8E5E7SE3CalmCalmE3CalmSE5E8E10E13
1 day agoE15E14NE15NE15NE15NE17NE16NE16E13
2 days agoE9E14NE16E18E18NE13E17E15E13E11E12E8E7E6E7E13E8E11E8SE3E6SE4SE3E15

Tide / Current Tables for Puerto Maunabo, Puerto Rico
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Puerto Maunabo
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Tue -- 02:11 AM AST     Moonset
Tue -- 04:56 AM AST     0.53 feet High Tide
Tue -- 06:00 AM AST     Sunrise
Tue -- 02:00 PM AST     Moonrise
Tue -- 05:16 PM AST     -0.00 feet Low Tide
Tue -- 06:42 PM AST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Tide / Current Tables for Vieques Passage, Puerto Rico Current
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Vieques Passage
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Tue -- 02:10 AM AST     Moonset
Tue -- 02:43 AM AST     0.00 knots Slack
Tue -- 05:55 AM AST     0.63 knots Max Flood
Tue -- 05:59 AM AST     Sunrise
Tue -- 08:57 AM AST     -0.00 knots Slack
Tue -- 12:23 PM AST     -0.78 knots Max Ebb
Tue -- 01:58 PM AST     Moonrise
Tue -- 03:49 PM AST     0.00 knots Slack
Tue -- 06:41 PM AST     Sunset
Tue -- 06:48 PM AST     0.62 knots Max Flood
Tue -- 09:54 PM AST     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Weather Map and Satellite Images
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GOES 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.
target = "new">Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (8,2,3,4)
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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.