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 6:30AM||Sunset 5:48PM||Friday November 17, 2017 8:57 PM AST (00:57 UTC)||Moonrise 5:42AM||Moonset 5:32PM||Illumination 1%|
EDIT (on/off)  Help
|AMZ735 Coastal Waters Of Southern Puerto Rico Out 10 Nm- 844 Pm Ast Fri Nov 17 2017 |
Rest of tonight..South winds 5 to 10 knots veering west after midnight. Seas 1 to 3 feet. Dominant period 7 seconds. Scattered showers and isolated Thunderstorms.
Saturday..South winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Scattered showers through the day. Isolated Thunderstorms in the afternoon.
Saturday night..Northwest winds 5 to 10 knots veering northeast after midnight. Seas 1 to 3 feet. Dominant period 7 seconds. Scattered showers in the evening. Isolated Thunderstorms through the night.
Sunday..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Isolated Thunderstorms in the morning. Scattered showers through the day.
Sunday night..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Isolated showers.
Monday..East winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 10 seconds. Isolated showers.
Tuesday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers.
Wednesday..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Isolated showers.
|AMZ700 844 Pm Ast Fri Nov 17 2017 |
Synopsis for puerto rico and the uS. Virgin islands waters... A shear line and associated moisture along will linger across the atlantic waters through the weekend. Southerly winds of 10 to 15 kts induced by a frontal trough will prevail across the regional waters. Showers and Thunderstorms will remain possible across the local waters through Monday. A northerly swell is forecast to reach the atlantic waters through Saturday.
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 172039|
area forecast discussion
national weather service san juan pr
439 pm ast Fri nov 17 2017
A mid to upper level trough will amplify over the western
caribbean sea into the weekend. A shear line will continue near
the islands through next week. The islands are forecast to
continue under a southerly wind flow.
Showers and thunderstorms are possible across the across the u.S.
Virgin islands and the eastern, interior and southern portions of
puerto rico through the overnight hours due to the combination of
surface convergence and diffluence aloft. In addition, a shear
line will aid in the formation of showers and thunderstorms across
the mona passage and atlantic waters of puerto rico. The southerly
wind flow continues to push a moist air mass over the islands.
Today we tied the record high temperature at the luis munoz marin
airport. This tied the old record of 91 fahrenheit set in 1983.
The combination of a weak frontal boundary, an induced surface
trough, a southerly wind flow and good ventilation aloft will
enhance showers and thunderstorm convection on Saturday. This
activity could increase the risk for flooding as well as mudslides
along steep terrains mainly across the u.S. Virgin islands and the
interior and eastern sections of puerto rico.
A mid to upper level ridge is expected to build across the forecast
area early next week and hold much of the forecast period. As this
feature strengthens mon-tue, available low level moisture is
expected to quickly erode with precipitable water values remaining
below the normal range tue-fri. At lower levels, east to east
southeast winds will prevail across the local isles as a surface|
high dominates the central atlantic. Under the aforementioned
pattern, expect mainly fair and stable weather condition much of
the next week with trade wind showers across usvi and E pr as well
as some locally induced afternoon showers across west areas of
Vcsh vcts across the local terminals today with MVFR cigs
possible across puerto rico eastern terminal sites. Sfc winds out
of the S to SW at 10 to 15 kts but fl340 - fl400 winds are out of
the SW to W at 20 to 30 kts. Vcsh vcts should diminish across the
western terminals by 19 00z then continue to the eastern terminals
by 18 03z.
Although seas and winds are expected below 5 feet and at less than
18 knots, mariners should exercise caution due to the possibility
of shower and thunderstorm development mainly across caribbean
passages and atlantic waters. A northerly swell is forecast to
move across the local waters of the atlantic waters by Saturday.
Preliminary point temps pops
Sju 77 86 78 87 40 60 60 60
stt 78 85 79 87 50 40 60 40
Sju watches warnings advisories
Pr... Flash flood watch through Saturday afternoon for the
communities downstream from the dam guajataca.
Short term... Cam
long term... .99
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||13 mi||57 min||SE 7.8 G 9.7||83°F||83°F||1008.4 hPa (+0.9)|
|41053 - San Juan, PR||38 mi||57 min||S 3.9 G 5.8||84°F||83°F||3 ft||1008.4 hPa (+0.9)|
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||SW||SW||E||SW||S||NE||W||W||S||E||S|
|2 days ago||SE||SE||NE||NE||E||S|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Playa Cortada |
Click for Map
Fri -- 05:42 AM AST Moonrise
Fri -- 06:32 AM AST Sunrise
Fri -- 09:46 AM AST 0.87 feet High Tide
Fri -- 10:55 AM AST 0.68 feet Low Tide
Fri -- 05:32 PM AST Moonset
Fri -- 05:48 PM AST Sunset
Fri -- 07:19 PM AST 0.77 feet High Tide
Fri -- 10:31 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
Fri -- 12:13 AM AST -0.01 feet Low Tide
Fri -- 05:41 AM AST Moonrise
Fri -- 06:31 AM AST Sunrise
Fri -- 09:56 AM AST 0.66 feet High Tide
Fri -- 05:31 PM AST Moonset
Fri -- 05:47 PM AST Sunset
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 (19,4,5,8)(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.