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.
This was requested by a user. If you have requests, please let me know.
|Sunrise 6:01AM||Sunset 6:47PM||Tuesday April 25, 2017 8:29 AM AST (12:29 UTC)||Moonrise 5:26AM||Moonset 6:06PM||Illumination 0%|
EDIT (on/off)  Help
|AMZ735 Coastal Waters Of Southern Puerto Rico Out 10 Nm- 426 Am Ast Tue Apr 25 2017 |
Today..Southeast winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated showers.
Tonight..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers in the evening, then isolated Thunderstorms after midnight.
Wednesday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated Thunderstorms in the morning, then isolated showers in the afternoon.
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 15 to 20 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers.
Friday..East winds 15 to 20 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Isolated showers.
Saturday..East winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Isolated showers.
|AMZ700 426 Am Ast Tue Apr 25 2017 |
Synopsis for puerto rico and the uS. Virgin islands waters... Strong surface high pressure is expected to remain across the north central atlantic for the rest of the week. A surface low pressure is forecast to move across the mid atlantic coast of the united states into the northwestern atlantic during the next few days...associated front is expected to remain over the western atlantic. Moderate to fresh southeasterly winds will prevail through Wednesday...becoming more easterly through the end of the week. Seas will continue to diminish and remain below 5 feet for much of the forecast period.
7 Day Forecast for Marine Location Near Playita Cortada, PRHourly EDIT Help
Area Discussion for - San Juan, PR  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxca62 tjsj 250910|
area forecast discussion
national weather service san juan pr
510 am ast Tue apr 25 2017
Synopsis Trough aloft moves over the area from the west today.
Zonal flow follows with ridge building across the western
caribbean and tutt low developing northeast of the area by late
in the weekend into early next week. At lower levels, broad ridge
pattern is to persist across the north central atlantic through
the rest of the week and a surface low will move north across the
mid atlantic coast of the usa during the next few days. Moist
southeasterly winds will continue today.
Short term Tuesday through Thursday...
variably cloudy skies prevailed overnight and early this morning
across the local islands. Passing showers were observed across the
waters as well as eastern puerto rico and the u.S. Virgin
islands. However, rainfall accumulations associated with these
showers were minimal. Coastal temperatures were in the upper 70s
to low 80s under southeasterly winds at 10 knots or less.
Ridge aloft will continue to erode as a broad mid to upper level
trough moves across the western atlantic and over the local islands.
The jet maxima associated with the aforementioned trough will favor
a divergent pattern, particularly today. Trofiness is then expected
to move away on Wednesday with a second trough developing north of
the area Friday and into the upcoming weekend. At lower levels, a
surface low across the western atlantic and a surface high across
the central atlantic will continue to promote a moist southeasterly
wind flow during the next two days or so. Although easterly winds
will return to the forecast area Thursday, moisture advection will
persist across the forecast area.
Therefore, expect a few passing showers across usvi and E pr during
the morning hours with shower and thunder activity increasing
across the forecast area in the afternoon. These showers and
thunderstorms are expected mainly east and north of the cordillera
central as well as usvi. With the heaviest showers and thunderstorms
urban flooding is likely. As the trough moves away early Wednesday,
expect another round of overnight and early morning showers with
thunderstorms possible across usvi and E pr. Wednesday afternoon and
into Thursday, a more seasonable weather pattern is expected with
locally induced showers across west pr in the afternoon.
Long term Friday through Wednesday...
fair weather conditions are expected to prevail. Surface high
pressure builds further to the west and north of the area. Winds
expected to increase from the east-northeast. Trade wind shower
pattern and limited afternoon shower activity confined to the
interior and southwest quadrant of pr is expected as well as
streamers developing off the usvi's. A tutt low is forecast to
develop northeast of the region by early next week. As the tutt
retrogress across the northeast caribbean islands... Weather
conditions will become unstable by midweek next week.
Aviation MostlyVFR conds expected this morning at all TAF sites
with -shra possible at the leeward and usvi terminals as well as
jsj. Shra/tsra development expected aft 25/16z and this may result
in MVFR or even ifr conds in and around jsj and jbq through 25/22z.
Southeasterly winds at 10 to 15 knots with sea breeze variations,
becoming light and variable overnight.
Marine Northerly swell will subside today across the atlantic
waters. Small crafts should exercise caution due to seas up to 6
feet across the offshore atlantic waters and due to southeasterly
winds up to 20 knots across much of the caribbean waters and
passages. There is a moderate to high risk of rip currents for the
northern beaches of pr and culebra. Moderate risk elsewhere
across the rest of the islands. Seas under 5 feet are expected
from Wednesday through the weekend. East winds will prevail after
Wednesday night between 10-15 knots.
Preliminary point temps/pops
Sju 90 76 87 76 / 40 40 40 30
stt 85 76 84 76 / 50 60 60 30
Pr... High rip current risk through this afternoon for culebra-north
High rip current risk until 6 am ast early this morning for
northwest-san juan and vicinity-western interior.
Short term... Om
long term... .Ds
Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
|Stations||Dist||Age||Wind||Air Temp||Water Temp||Waves||Pressure||DewPt|
|JOXP4 - Jobos Bay Reserve, Puerto Rico||12 mi||104 min||E 6||79°F||1014 hPa||74°F|
|IMGP4||31 mi||49 min||ESE 12 G 16||82°F|
|MGIP4 - 9759110 - Magueyes Islands, PR||32 mi||71 min||SE 2.9 G 8.9||82°F||81°F||1012.9 hPa|
|YABP4 - 9754228 - Yabucoa Harbor, PR||33 mi||71 min||ESE 8 G 13|
|AROP4 - 9757809 - Arecibo, PR||37 mi||71 min||Calm G 1||74°F|
|SJNP4 - 9755371 - San Juan, PR||38 mi||71 min||SE 4.1 G 6||81°F||80°F||1013.6 hPa|
|41053 - San Juan, PR||39 mi||89 min||ENE 3.9 G 5.8||80°F||80°F||5 ft||1012.8 hPa (+1.6)|
|MGZP4 - 9759394 - Mayaguez, PR||41 mi||71 min||NNE 1.9 G 5.1||80°F||83°F||1012.8 hPa|
Wind History for Penuelas (Punta Guayanilla), PR(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Ponce, Mercedita Airport, PR||7 mi||3.7 hrs||N 0||10.00 mi||A Few Clouds||77°F||73°F||89%||1013.5 hPa|
Wind History from JPS (wind in knots)
|1 day ago||Calm||E||E||E||E||E||E||E||E|
|2 days ago||Calm||NE||NE||NE||NE||Calm||E|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Playa Cortada |
Click for Map
Tue -- 05:25 AM AST Moonrise
Tue -- 06:02 AM AST Sunrise
Tue -- 07:47 AM AST 0.75 feet High Tide
Tue -- 09:59 AM AST 0.07 feet Low Tide
Tue -- 06:06 PM AST Moonset
Tue -- 06:44 PM AST Sunset
Tue -- 09:29 PM AST 0.93 feet High Tide
Tue -- 10:53 PM AST 0.52 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Playa de Ponce |
Click for Map
Tue -- 05:26 AM AST Moonrise
Tue -- 06:03 AM AST Sunrise
Tue -- 12:56 PM AST 0.03 feet Low Tide
Tue -- 06:06 PM AST Moonset
Tue -- 06:45 PM AST Sunset
Tue -- 09:14 PM AST 0.56 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Weather Map and Satellite Images(on/off)  Help
|Weather Map ||IR Satellite Image from GEOS|
GOES Local Image of Puerto Rico EDIT
Wind Forecast for (8,2,3,4)(on/off)  Help
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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.