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 6:29AM||Sunset 6:06PM||Monday October 23, 2017 8:24 PM AST (00:24 UTC)||Moonrise 9:40AM||Moonset 9:08PM||Illumination 15%|
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|AMZ742 Coastal Waters Of Northwestern Puerto Rico Out 10 Nm- 333 Pm Ast Mon Oct 23 2017 |
Tonight..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Numerous showers and isolated Thunderstorms.
Tuesday..Northeast winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds.
Tuesday 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.
Wednesday..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Scattered showers through the day. Isolated Thunderstorms in the afternoon.
Wednesday night..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Isolated showers.
Thursday..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 11 seconds. Isolated Thunderstorms. Scattered showers.
Friday..East winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 11 seconds. Isolated showers.
Saturday..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 11 seconds. Isolated showers.
|AMZ700 333 Pm Ast Mon Oct 23 2017 |
Synopsis for puerto rico and the uS. Virgin islands waters... Surface high pressure will continue north of the area to promote moderate to locally fresh trade winds through at least midweek. A gentle to moderate east southeast wind flow is then expected by Wednesday and into the end of the work week.
7 Day Forecast for Marine Location Near Rinc�n, PRHourly EDIT Help
Area Discussion for - San Juan, PR  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxca62 tjsj 231953|
area forecast discussion
national weather service san juan pr
353 pm ast Mon oct 23 2017
Synopsis Strong surface high pressure will remain anchored across the west
and central atlantic to maintain a moderate east to southeast
trade wind flow through the end of the work week. A weak tropical
wave is forecast to enter and move across the eastern caribbean by
mid week. A low to mid level trough will approach the region
during the weekend.
Short term Tonight through Wednesday...
modest low level moisture and dry air aloft favoring strong morning
insolation coupled with low 500 mb temperatures create an unstable
atmosphere for afternoon thunderstorms today and Tuesday.
Convection will die shortly after sunset each day. The northerly
upper level jet over puerto rico around an upper level low just
north of the leeward islands will also increase ventilation where
convergence divergence remains neutral. The low will move southeast
into the windward islands Wednesday and the jet will shift with it,
but better moisture at most levels will increase showers and
thunderstorms over the area then. Easterly winds at the surface will
shift to east southeast midday on Wednesday and shower and
thunderstorms will then focus more in northwest puerto rico. The u.S.
Virgin islands will continue to see isolated showers and streamers
downstream from the islands.
Long term Thursday through Tuesday...
an upper level ridge will remain across the local area through
the weekend. However, at lower level, an increase in moisture is
expected Saturday and Sunday as a low to mid level trough moves
through the region. By early next week, the upper ridge will be
eroded by an upper level trough which will retrograde west across
the local region.
Aviation MostlyVFR conditions expected across all terminals
throughout the forecast period, however tsra ovr WRN pr will bring
MVFR ifr in lwr CIGS vsbys and some mtn obscurations. E winds of 10-
15 kt excpt for sea breeze influences diminishing below 12 kt after
23 00z. Shra dvlpg aft 24 06z in easterly flow and will move onshore
in ERN pr and over usvi. MAX winds north 50 kt nr fl410 incrg to 70
kt by 24 12z.
Marine Seas up to 5 feet and winds up to 15 knots are expected
across the coastal waters.
Preliminary point temps pops
Sju 77 88 76 88 40 20 30 30
stt 77 87 78 87 20 10 30 30
Sju watches warnings advisories
Short term... Ws
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|
|MISP4 - 9759938 - Mona Island, PR||70 mi||54 min||78°F||85°F||1013.7 hPa|
Wind History for Mayaguez, PR(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Aquadilla, Rafael Hernandez Airport, PR||78 mi||34 min||ESE 4||10.00 mi||Mostly Cloudy||75°F||69°F||83%||1014.6 hPa|
Wind History from JBQ (wind in knots)
|1 day ago||E||E||E||E|
|2 days ago||SE|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Mona Island |
Click for Map
Mon -- 01:23 AM AST -0.06 feet Low Tide
Mon -- 06:27 AM AST Sunrise
Mon -- 09:35 AM AST Moonrise
Mon -- 10:44 AM AST 0.79 feet High Tide
Mon -- 01:41 PM AST 0.64 feet Low Tide
Mon -- 03:58 PM AST 0.72 feet High Tide
Mon -- 06:04 PM AST Sunset
Mon -- 09:07 PM AST Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
Click for Map
Mon -- 04:04 AM AST 0.01 feet Low Tide
Mon -- 06:25 AM AST Sunrise
Mon -- 09:32 AM AST Moonrise
Mon -- 10:32 AM AST 1.43 feet High Tide
Mon -- 05:12 PM AST 0.18 feet Low Tide
Mon -- 06:00 PM AST Sunset
Mon -- 09:04 PM AST Moonset
Mon -- 10:31 PM AST 0.90 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 (20,4,5,8)(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.