Marine Weather and Tides
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 7:00AM||Sunset 6:17PM||Sunday January 21, 2018 8:53 AM AST (12:53 UTC)||Moonrise 10:05AM||Moonset 10:13PM||Illumination 23%|
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|AMZ735 Coastal Waters Of Southern Puerto Rico Out 10 Nm- 533 Am Ast Sun Jan 21 2018 |
Today..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Scattered showers.
Tonight..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated showers.
Monday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated showers.
Monday night..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated showers.
Tuesday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated showers.
Wednesday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated showers.
Thursday..Northeast winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Scattered showers.
|AMZ700 533 Am Ast Sun Jan 21 2018 |
Synopsis for puerto rico and the uS. Virgin islands waters... Surface high pressure will move into the west and central atlantic later today producing moderate to locally fresh trade winds through Tuesday. Due to the strengthening high pressure a strong local pressure gradient will form across the region, increasing the trade wind flow. A long dominant period northerly swell will continue to spread across the atlantic waters and passages through Wednesday.
7 Day Forecast for Marine Location Near Santo Domingo, PRHourly EDIT Help
Area Discussion for - San Juan, PR  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxca62 tjsj 211113 cca|
area forecast discussion... Corrected
national weather service san juan pr
713 am ast Sun jan 21 2018
Synopsis Surface ridge and upper level ridge of high pressure
will create mostly fair weather conditions for puerto rico and the
u.S. Virgin islands through Friday. Moderate to fresh trades winds
will cause isolated showers for most of the forecast area through
late next week. Friday, a trough of low pressure will move across
the atlantic waters and possibly increase showers activity for
puerto rico and the u.S. Virgin islands on Saturday.
Short term Today through Tuesday... Partly cloudy skies prevailed
across puerto rico and the u.S. Virgin islands overnight. Latest
satellite images depicted an area of low level moisture over the
u.S. Virgin islands early this morning. This area of moisture will
spread across puerto rico this morning, bringing with it some
isolated passing showers. These showers will move quickly
westward. For this afternoon, some cloudiness with showers are
expected to develop across the western interior and west sections
of puerto rico.
High pressure system located north of the area will continue in
control of the weather locally. Trade winds will continue to
transport patches of low level moisture across the local islands
from time to time during the next couple of days.
Long term Wednesday through Monday...
easterly trade winds will bring patches of low level moisture
periodically over the region through the long term period thus
scattered showers are possible during the morning and afternoon
hours. Strong brisk easterly winds can be expected through
Wednesday due to the strengthening surface high pressure system
to north of puerto rico. Otherwise, mostly fair weather conditions
across the forecast area until the end of next week when a trough
of low pressure moves into the atlantic waters with some guidance
showing a frontal passage on Saturday.
Aviation Vfr conditions are expected to prevail across all
terminals through at least 21 22z. Some light to moderate showers
can be expected in the vicinity of tist, tisx and tjsj throughout
the forecast period. Low level winds will continue mainly from the
east at 10 to 15 kts with higher gusts.
Marine Hazards weather conditions will prevail through Tuesday.
A long period northerly swell will cause seas to rise to 6 to 8|
feet through Tuesday. Small craft advisories are in effect for
the atlantic waters and passages as well across portions of the
offshore caribbean waters. High rip current risk continues in
effect for the northern coast of the local islands, excluding st.
John with moderate risk. High surf advisory is in effect for the
atlantic beaches of puerto rico.
Preliminary point temps pops
Sju 85 74 85 74 40 20 40 30
stt 78 77 79 78 20 30 40 20
Sju watches warnings advisories
Pr... High rip current risk through late tonight for culebra-mayaguez
and vicinity-north central-northeast-northwest-san juan and
High surf advisory until 6 pm ast this evening for mayaguez and
vicinity-north central-northeast-northwest-san juan and
High rip current risk through this afternoon for vieques.
Vi... High rip current risk through late tonight for st.Thomas... St.
John... And adjacent islands.
High rip current risk through this afternoon for st croix.
Am... Small craft advisory until 8 pm ast this evening for caribbean
waters of puerto rico from 10 nm to 17n-coastal waters of
northwestern puerto rico out 10 nm-coastal waters of
northern usvi and culebra out 10 nm.
Small craft advisory until 2 am ast Monday for coastal waters of
northern puerto rico out 10 nm.
Small craft advisory until 2 pm ast Tuesday for atlantic waters
of puerto rico and usvi from 10 nm to 19.5n.
Small craft advisory until 2 pm ast Monday for anegada passage
southward to 17n.
Small craft advisory until 8 am ast Monday for mona passage
southward to 17n.
Short term... Fc
long term... .Tw
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|
|42085 - Southeast of Ponce, PR||20 mi||114 min||NE 12 G 16||79°F||81°F||1015.2 hPa (+0.0)|
|AROP4 - 9757809 - Arecibo, PR||26 mi||54 min||SSE 1.9 G 2.9|
|JOXP4 - Jobos Bay Reserve, Puerto Rico||30 mi||69 min||NE 4.1||74°F||1017 hPa||69°F|
|SJNP4 - 9755371 - San Juan, PR||42 mi||54 min||80°F||1017.6 hPa (+1.1)|
|41053 - San Juan, PR||43 mi||54 min||SE 9.7 G 12||78°F||81°F||6 ft||1016.7 hPa (+1.1)|
|YABP4 - 9754228 - Yabucoa Harbor, PR||49 mi||54 min||81°F|
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
Wind History from JPS (wind in knots)
|1 day ago||Calm||E||Calm||Calm||NE||Calm||Calm|
|2 days ago||Calm||NE||Calm||Calm|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Punta Guayanilla |
Click for Map
Sun -- 02:12 AM AST -0.04 feet Low Tide
Sun -- 07:01 AM AST Sunrise
Sun -- 10:05 AM AST Moonrise
Sun -- 12:23 PM AST 0.52 feet High Tide
Sun -- 06:15 PM AST Sunset
Sun -- 10:13 PM AST Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Playa de Ponce |
Click for Map
Sun -- 01:40 AM AST -0.03 feet Low Tide
Sun -- 07:00 AM AST Sunrise
Sun -- 10:04 AM AST Moonrise
Sun -- 11:15 AM AST 0.54 feet High Tide
Sun -- 06:14 PM AST Sunset
Sun -- 10:12 PM AST Moonset
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 (7,2,3,4)(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.