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 6:45AM||Sunset 5:50PM||Monday December 11, 2017 5:29 AM AST (09:29 UTC)||Moonrise 1:06AM||Moonset 1:33PM||Illumination 45%|
EDIT (on/off)  Help
|AMZ712 Coastal Waters Of Northern Puerto Rico Out 10 Nm- 404 Am Ast Mon Dec 11 2017 |
Today..Northeast winds 5 to 10 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. Northeast swell around 4 feet. Scattered showers.
Tonight..Southeast winds 5 to 10 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 11 seconds. Northeast swell around 4 feet. Isolated showers.
Tuesday..East winds 5 to 10 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. Northeast swell around 4 feet. Isolated showers.
Tuesday night..Southeast winds 5 to 10 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 9 seconds. Isolated showers.
Wednesday..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Isolated showers.
Thursday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 11 seconds. Northeast swell around 4 feet. Isolated showers.
Friday..East winds 10 to 15 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 10 seconds. Northwest swell 4 to 5 feet. Isolated showers.
|AMZ700 404 Am Ast Mon Dec 11 2017 |
Synopsis for puerto rico and the uS. Virgin islands waters... Seas will continue to subside today. A surface high pressure across the north central atlantic will maintain moderate easterly trade wind flow across the local waters.
7 Day Forecast for Marine Location Near Lomas, PRHourly EDIT Help
Area Discussion for - San Juan, PR  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxca62 tjsj 110832|
area forecast discussion
national weather service san juan pr
432 am ast Mon dec 11 2017
Synopsis Upper level ridge will maintain a relatively stable
weather pattern across the region for the next couple of days.
Only brief showers with minimal rainfall accumulations are
possible. Not significant changes in the present weather pattern
are expected for the next several days.
Short term Today through Wednesday...
a patch of moisture across the eastern sections of the forecast area
is causing showers over the usvi, vieques, culebra and the eastern
sections of pr. This small area of higher moisture is expected to
remain in the area through the morning hours and then move west and
slightly south, which will bring enhanced moisture to southern and
southwestern puerto rico by the afternoon hours. For this reason,
the forecast was adjusted to increase the probability of rain across
southern into western pr in the afternoon as well as some showers
that may stream off the local islands. Because the upper levels are
pretty stable, no thunderstorm development is expected today.
Isolated to locally scattered but brief showers are expected tonight
as the patch of moisture leaves the area.
Mainly isolated to scattered showers are expected again on Tuesday
and Wednesday as the local winds diminish and bringing moisture from
the south. There is a surface high pressure across the NE atlantic
and a strong sfc low pressure across the ne-us that will cause a col
over the local area. Because of this the local winds will diminish
and the showers over the local area will be greatly influenced by
the local factors. So expect scattered showers across various sectors
of the forecast area but mainly across the interior of pr.
Long term Thursday through Tuesday...
an upper level ridge is expected to build across the northeast
Thursday through the upcoming weekend. This feature is expected to
maintain a relatively stable weather pattern across the local|
islands during the forecast period. A dissipating frontal
boundary shear line is expected to remain across the atlantic
waters to the northwest and north of the local islands Thursday
and Friday. Strong surface high pressure across the northeastern
atlantic will promote an east to east-northeast winds across the
local islands Thursday and until at least Saturday. Another
surface high pressure is expected to move just north of the local
area late in the upcoming weekend, tightening the pressure
gradient and causing breezy conditions early during the upcoming
week. Small patches of moisture embedded in the trades will bring
brief periods of showers across the windward side of the islands
especially during the nights and early in the mornings. However,
the upper level ridge over the region will inhibit the development
of widespread or significant precipitation during the forecast
Aviation Vfr conds expected across the local terminals for the
next 24 hours. Brief shra over the local area will cause vcsh across
tist tisx and tjsj at least through the morning hours with possible
but brief moments of MVFR conds with the heaviest shra. Afternoon
shra may cause vcsh for tjps and tjmz. Winds from the east to NE at
10 to 15kt.
Marine Winds and seas will continue to diminish today. There is
a moderate risk of rip current for the northwest to northeast
beaches of puerto rico, vieques, culebra and for most beaches of
saint thomas, saint john and saint croix.
Preliminary point temps pops
Sju 84 74 86 76 30 30 30 20
stt 86 74 85 75 30 20 20 30
Sju watches warnings advisories
Short term... Ja
long term... .Jf
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|
|41053 - San Juan, PR||16 mi||59 min||ENE 12 G 16||80°F||1012.5 hPa|
|SJNP4 - 9755371 - San Juan, PR||16 mi||47 min||82°F||1013.5 hPa|
|YABP4 - 9754228 - Yabucoa Harbor, PR||16 mi||41 min||75°F|
|41056||25 mi||59 min||NE 14 G 18||80°F||1012.8 hPa|
|CLBP4 - 9752235 - Culebra, PR||33 mi||41 min||79°F||82°F||1013 hPa|
|AROP4 - 9757809 - Arecibo, PR||43 mi||41 min||SSE 4.1 G 5.1|
|42085 - Southeast of Ponce, PR||43 mi||89 min||N 5.8 G 7.8||80°F||1011.9 hPa (-1.4)|
Wind History for Fajardo, PR(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|San Juan, Luis Munoz Marin International Airport, PR||11 mi||33 min||ENE 8||10.00 mi||Mostly Cloudy||78°F||72°F||82%||1013.2 hPa|
Wind History from JSJ (wind in knots)
|1 day ago||E||E||SE||E||E|
|2 days ago||SE||S||SE||SE||E||E||E||E|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Boca De Cangrejos |
Click for Map
Mon -- 01:05 AM AST Moonrise
Mon -- 03:56 AM AST 1.03 feet High Tide
Mon -- 06:45 AM AST Sunrise
Mon -- 09:46 AM AST 0.35 feet Low Tide
Mon -- 01:33 PM AST Moonset
Mon -- 03:54 PM AST 1.15 feet High Tide
Mon -- 05:48 PM AST Sunset
Mon -- 10:32 PM AST 0.11 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Vieques Passage |
Click for Map
Mon -- 01:04 AM AST Moonrise
Mon -- 02:16 AM AST 0.00 knots Slack
Mon -- 05:32 AM AST 0.76 knots Max Flood
Mon -- 06:43 AM AST Sunrise
Mon -- 08:54 AM AST -0.00 knots Slack
Mon -- 11:58 AM AST -0.64 knots Max Ebb
Mon -- 01:31 PM AST Moonset
Mon -- 03:17 PM AST 0.00 knots Slack
Mon -- 05:47 PM AST Sunset
Mon -- 05:54 PM AST 0.43 knots Max Flood
Mon -- 08:31 PM AST -0.00 knots Slack
Mon -- 11:54 PM AST -0.66 knots Max Ebb
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 (4,6,7,8)(on/off)  Help
Ad by Google
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.