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 6:22AM||Sunset 6:26PM||Tuesday September 26, 2017 7:07 AM AST (11:07 UTC)||Moonrise 11:43AM||Moonset 11:14PM||Illumination 33%|
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|AMZ741 Mona Passage Southward To 17n- 543 Am Ast Tue Sep 26 2017 |
.small craft should exercise caution...
Today..Southeast winds 10 to 15 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 12 seconds. Northwest swell 4 to 5 feet. Slight chance of Thunderstorms.
Tonight..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 12 seconds. Northwest swell 4 to 5 feet.
Wednesday..Southeast winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 11 seconds. North swell around 4 feet.
Wednesday night..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 11 seconds. North swell 4 to 5 feet. Slight chance of Thunderstorms through the night.
Thursday..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 11 seconds. North swell 4 to 5 feet. Chance of Thunderstorms.
Friday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 12 seconds. North swell around 4 feet. Chance of Thunderstorms.
Saturday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 11 seconds. North swell around 4 feet. Thunderstorms likely.
|AMZ700 543 Am Ast Tue Sep 26 2017 |
Synopsis for puerto rico and the uS. Virgin islands waters... Long period northwesterly swell from hurricane maria will continue to produce elevated seas of 4-6 feet, especially across the atlantic waters north and west of puerto rico through mid-week. Small craft will need to exercise caution in these waters. Winds will be easterly generally around 10 to 15 knots. Drier weather will move into the region through Wednesday before deeper tropical moisture returns Thursday through this weekend. Scattered showers and Thunderstorms will locally heavy downpours will be possible.
7 Day Forecast for Marine Location Near El Combate, PRHourly EDIT Help
Area Discussion for - San Juan, PR  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxca62 tjsj 260904|
area forecast discussion
national weather service san juan pr
issued by national weather service miami fl
504 am ast Tue sep 26 2017
Mainly light easterly to southeasterly flow will continue through
Wednesday with saharan dust moving across the region, allowing for
drier weather to affect the islands. With abundant low-level
moisture and light winds near the surface, isolated seabreeze
activity will still be possible and in the higher terrain, with a
couple heavy downpours due to high precipitable water values.
Still, this period will promote a favorable respite in the weather
pattern, and should help the recovery efforts across puerto rico
and the u.S. Virgin islands.
With decreased rain chances and light winds, conditions will be
very uncomfortable Tuesday and Wednesday with heat indices in the
mid to upper 90s for much of the lower elevations of puerto rico.
Across area beaches, especially on the northern atlantic side of
the islands, long-period swells will continue to produce life-
threatening rip currents today. A high risk of rip currents is in
effect for much of the coastlines through this evening.
Precipitation chances will increase by Thursday with scattered showers
and thunderstorms possible through the weekend. Model guidance
shows the potential for heavy rainfall Friday and Saturday, which
would aggravate already swollen rivers and and low-lying areas
that experienced recent flooding. Recovery efforts will need to
keep a very close eye on thunderstorms during this period, as
additional flooding will be possible.
A few isolated showers and storms will be possible
today in the interior portions of puerto rico and in the higher
terrain, however, most areas should remain on the dry side.VFR
conditions will likely prevail through the period with exception
to in or around convection where ceilings may briefly drop to
Hurricane maria, well to the north, is still producing long-
period swells into mainly the northern atlantic side of puerto
rico with seas ranging from 4 to 6 feet through the end of the
week. Small craft should exercise caution in these areas. Drier
weather will return to the region Tuesday and Wednesday with
deeper tropical moisture returning thereafter. Shower and
thunderstorm chances will increase by Thursday and into the
Preliminary point temps pops
Sju 86 80 85 79 10 20 10 0
stt 83 81 82 81 10 20 10 10
Sju watches warnings advisories
Pr... High rip current risk through this evening for mayaguez and
vicinity-north central-northeast-northwest-ponce and
vicinity-san juan and vicinity-southeast-southwest-western
Am... High rip current risk through this evening for coastal waters of
southwestern puerto rico out 10 nm.
Short term... Cb
long term... .Cb
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||0 mi||49 min||79°F||82°F||1014.1 hPa|
Wind History for Mayaguez, PR(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
Wind History from JMZ (wind in knots)
|1 day ago|
|2 days ago|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Mona Island |
Click for Map
Tue -- 03:28 AM AST 0.04 feet Low Tide
Tue -- 06:21 AM AST Sunrise
Tue -- 11:42 AM AST Moonrise
Tue -- 01:12 PM AST 0.64 feet High Tide
Tue -- 03:32 PM AST 0.61 feet Low Tide
Tue -- 06:19 PM AST 0.71 feet High Tide
Tue -- 06:24 PM AST Sunset
Tue -- 11:14 PM AST Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Puerto Real |
Click for Map
Tue -- 06:08 AM AST 0.24 feet Low Tide
Tue -- 06:18 AM AST Sunrise
Tue -- 11:39 AM AST Moonrise
Tue -- 01:11 PM AST 1.20 feet High Tide
Tue -- 06:21 PM AST Sunset
Tue -- 07:52 PM AST 0.53 feet Low Tide
Tue -- 11:10 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.