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 6:24AM||Sunset 6:37PM||Thursday March 23, 2017 2:19 AM AST (06:19 UTC)||Moonrise 3:01AM||Moonset 2:39PM||Illumination 20%|
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|AMZ735 Coastal Waters Of Southern Puerto Rico Out 10 Nm- 852 Pm Ast Wed Mar 22 2017 |
Rest of tonight..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Southeast swell around 4 feet in the evening. Scattered showers.
Thursday..Southeast winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Scattered showers.
Thursday night..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers.
Friday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Scattered showers.
Friday night..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Scattered showers.
Saturday..Southeast winds 15 to 20 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Southeast swell around 4 feet. Scattered showers.
Sunday..Southeast winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 10 seconds. Scattered showers.
Monday..Southeast winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Scattered showers.
|AMZ700 852 Pm Ast Wed Mar 22 2017 |
Synopsis for puerto rico and the uS. Virgin islands waters... A light to moderate east southeast wind flow will continue across the local waters. Winds will become more southeast later tonight. A northerly swell will continue to affect the offshore atlantic waters through Thursday morning. A larger northerly swell expected to impact the atlantic waters and local passage by late Friday and this will maintain hazardous seas through the weekend.
7 Day Forecast for Marine Location Near Salinas, PRHourly EDIT Help
Area Discussion for - San Juan, PR  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxca62 tjsj 230149|
area forecast discussion
national weather service san juan pr
949 pm ast Wed mar 22 2017
Update Late tonight, an area of showers was seen across the
caribbean waters moving northwest affecting the southeast sections
of puerto rico. This area of showers will continue to move across
the eastern half of puerto rico overnight. Favorable upper level
atmospheric conditions will aid new round of showers across the
area through early Thursday morning. Forecast is on track with
ongoing weather situation. No changes were needed to forecast
Aviation Periods of showers will affect tjps overnight. For
the rest of the TAF sites, vcsh are expected. Low level winds will
be mainly east to southeast at 10 kts.
Marine Latest buoy observations continue to indicated seas up
to 7 feet across the offshore atlantic waters. As a result, the
small craft advisory has been extended until 10 am ast Thursday.
Prev discussion /issued 245 pm ast Wed mar 22 2017/
synopsis... A nearly stationary frontal boundary extending from
the north-central atlantic southwest to the windward passage
between hispaniola and cuba. An atlantic high pressure ridge
slowly moving east.
Short term... Tonight through Friday morning... Widely scattered
showers currently affecting the local area should diminish once
diurnal heating diminishes. Surface flow will continue from
southeast tonight and Thursday but will become more southerly and
lighter Thursday night and Friday as a strong low pressure system well
north over the northern atlantic pulls a trough north from the
eastern caribbean and over the area. This southeast to south flow
will bring increased moisture through the end of the work week. A
weak frontal boundary will hover to the north to enhance this
situation. A deepening upper level trough over cuba and jet north
of us will hold favorable divergence aloft. This will maintain
partly to mostly cloudy conditions with scattered showers.
Although heavy rains may occur in northwest puerto rico during the
afternoons, rains in general will be more probable on Friday with
isolated urban and small stream flooding possible.
Long term... Friday night through day 8/issued 455 am ast Wed mar
expect frequent periods of late evening and overnight passing
showers along portions of the north and east coastal sections of
the islands,followed by afternoon convection with enhanced shower
activity particularly across the interior and northern half of
puerto rico each day. The potential for periods of locally heavy
rainfall with minor urban and small stream flooding in isolated
areas will remain high across portions of the islands especially
for the northern and eastern half of puerto rico.
Long wave trough across the western atlantic is still forecast to|
deepen and extend southwards into the west and central caribbean
thru the end of the week . This will increase instability over the
northeastern caribbean leading to enhanced upper level divergence
across the region. The subtropical jet and associated maxima will
continue to strengthen and to round the base of the upper trough which
will lift northeastward to just north of the region. The inverted
surface trough is to continue to amplify and lift northwards across
the region with a weak surface low now forecast to develop just north
hispaniola by Monday. As a result, a moist south to southeasterly
flow should persist through Friday and into the weekend. All model
guidance support a very moist and unstable pattern across the region
for the next several days with good tropical moisture advection. Moisture
convergence along a frontal shear line, along with the lingering surface
trough and instability aloft will all favor high potential for enhanced
convection across the region at least through Tuesday of next week.
Winds are forecast to become more easterly by Wednesday as the surface
trough weakens and the upper trough fills and lifts north of the
region. This should then support a gradual decrease in moisture
transport. However, moisture along the old frontal shearline
should return across the region to allow for nocturnal shower
activity, and diurnally induced afternoon convection which should
be focused over the interior and west sections of pr.
Aviation... Mountains obscurations with isolated areas of MVFR conds
with CIGS 020-030 are expected in central and northern pr affecting
mainly tjbq/tjmz. ElsewhereVFR conds will prevail. Winds sfc to
fl050 SE 10 to 15 kts. Maximum winds wsw 75 knots at fl400.
Marine... Seas up to 7 feet are expected across the offshore
atlantic waters tonight. Seas will diminish by Thursday morning
however a larger northerly swell is expected to impact the
atlantic waters and local passages by late Friday with
deteriorating conditions though the weekend.
Preliminary point temps/pops
Sju 75 87 77 85 / 20 40 50 50
stt 75 85 74 84 / 30 30 50 50
Pr... High rip current risk through Thursday evening for culebra-
mayaguez and vicinity-north central-northeast-northwest-san
juan and vicinity-southeast-western interior.
Vi... High rip current risk through Thursday evening for
st.Thomas... St. John... And adjacent islands.
Am... High rip current risk through Thursday evening for coastal
waters of northern usvi and culebra out 10 nm-coastal
waters of southern usvi vieques and eastern puerto rico out
Small craft advisory until 10 am ast Thursday for atlantic
waters of puerto rico and usvi from 10 nm to 19.5n.
Short term... Fc
long term... .Fc
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||4 mi||95 min||NNW 1||71°F||1016 hPa||70°F|
|42085 - Southeast of Ponce, PR||13 mi||50 min||NNE 7.8 G 12||76°F||1014.2 hPa|
|YABP4 - 9754228 - Yabucoa Harbor, PR||26 mi||50 min||SE 5.1 G 8|
|SJNP4 - 9755371 - San Juan, PR||37 mi||50 min||SSW 5.1 G 6||76°F||81°F||1014.9 hPa|
|41053 - San Juan, PR||38 mi||50 min||S 5.8 G 9.7||77°F||1014.2 hPa|
|IMGP4||39 mi||30 min||E 7 G 12||75°F||1014 hPa|
|MGIP4 - 9759110 - Magueyes Islands, PR||40 mi||50 min||ESE 1.9 G 8||75°F||81°F||1014.6 hPa|
|AROP4 - 9757809 - Arecibo, PR||43 mi||50 min||S 4.1 G 5.1||73°F|
|ESPP4 - 9752695 - Esperanza, PR||45 mi||50 min||WSW 1 G 5.1||77°F||81°F||1014.7 hPa|
|FRDP4 - 9753216 - Fajardo, PR||45 mi||50 min||SW 4.1 G 6||73°F||71°F|
|VQSP4 - 9752619 - Isabel Segunda, Vieques, PR||48 mi||50 min||Calm G 0||77°F|
|MGZP4 - 9759394 - Mayaguez, PR||49 mi||50 min||NE 1.9 G 5.1||74°F||82°F||1014.4 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||15 mi||30 min||ENE 5||8.00 mi||Mostly Cloudy||73°F||71°F||94%||1016.3 hPa|
Wind History from JPS (wind in knots)
|1 day ago||Calm||Calm||Calm||Calm||Calm||E||S||Calm||Calm||Calm||Calm|
|2 days ago||Calm||Calm||Calm||S||SE||N||W||Calm||Calm||Calm|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Playa Cortada |
Click for Map
Thu -- 03:01 AM AST Moonrise
Thu -- 06:27 AM AST Sunrise
Thu -- 07:34 AM AST 0.69 feet High Tide
Thu -- 08:52 AM AST 0.56 feet Low Tide
Thu -- 02:39 PM AST Moonset
Thu -- 05:02 PM AST 0.62 feet High Tide
Thu -- 06:37 PM AST Sunset
Thu -- 08:12 PM AST 0.03 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Las Mareas |
Click for Map
Thu -- 02:59 AM AST Moonrise
Thu -- 06:26 AM AST Sunrise
Thu -- 07:28 AM AST 0.67 feet High Tide
Thu -- 02:38 PM AST Moonset
Thu -- 06:19 PM AST 0.16 feet Low Tide
Thu -- 06:36 PM AST Sunset
Thu -- 07:20 PM AST 0.16 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 (2,6,7,8)(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.