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 6:18AM||Sunset 5:57PM||Sunday October 22, 2017 6:38 PM AST (22:38 UTC)||Moonrise 8:37AM||Moonset 8:15PM||Illumination 8%|
EDIT (on/off)  Help
|AMZ735 Coastal Waters Of Southern Puerto Rico Out 10 Nm- 354 Pm Ast Sun Oct 22 2017 |
.small craft should exercise caution...
Tonight..East winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 7 seconds. Isolated showers through the night.
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 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers.
Tuesday night..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Scattered showers.
Wednesday..East winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Isolated showers.
Thursday..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Isolated showers.
Friday..Northeast winds 5 to 10 knots. Seas 2 feet or less. Dominant period 8 seconds. Isolated Thunderstorms. Scattered showers.
|AMZ700 354 Pm Ast Sun Oct 22 2017 |
Synopsis for puerto rico and the uS. Virgin islands waters... A surface high pressure will continue north of the area for the next few days to promote a moderate to fresh easterly wind flow through at least midweek.
7 Day Forecast for Marine Location Near Emajagua, PRHourly EDIT Help
Area Discussion for - San Juan, PR  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxca62 tjsj 221953|
area forecast discussion
national weather service san juan pr
353 pm ast Sun oct 22 2017
Synopsis A relatively dry and stable weather pattern will prevail
across the forecast area as an upper level ridge will continue as
the main weather feature across the region until at least Monday.
An upper trough northeast of the region is expected to sink
southward over the lesser antilles by midweek increasing the
moisture across the local islands.
Short term A fair and stable weather pattern is forecast to
prevail across the region the next couple of days. There is still
a chance for locally and diurnally induced afternoon showers each
day, mainly over the western portions of puerto rico.
Long term An upper level low trough northeast of the region is expected to
sink southward toward the leeward antilles on Tuesday and Wednesday.This
feature will result in a gradual increase in moisture across the region
by midweek. However, at this moment not significant or widespread precipitation
is expected. A tropical wave is expected to reach the region Friday
generating a better chance of showers and thunderstorms through next
Aviation MostlyVFR conditions expected across all terminals|
throughout the forecast period. E-se winds of 10-15kt diminishing
below 10kt after 23 00z. Some brief passing shra near the tjsj,
tisx, tist terminals possible overnight into the early morning
hours. Winds increasing once again above 10-15kt after 23 14z with
sea breeze variations developing.
Marine Small craft operators are urged to exercise caution
mainly across the caribbean waters as seas will be up to 6 feet
and winds above the 20 knots. The atlantic waters seas will be up
to 5 feet with winds up to 15 knots.Low to moderate rip current
risk across all the local beaches.
Preliminary point temps pops
Sju 77 87 75 88 20 20 20 20
stt 77 87 76 88 20 20 30 30
Sju watches warnings advisories
Short term... Om
long term... .Em
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|
|YABP4 - 9754228 - Yabucoa Harbor, PR||5 mi||50 min||85°F|
|JOXP4 - Jobos Bay Reserve, Puerto Rico||18 mi||173 min||E 11||85°F||1015 hPa||73°F|
|41056||29 mi||98 min||E 12 G 16||83°F||3 ft||1015.1 hPa (-1.0)|
|SJNP4 - 9755371 - San Juan, PR||34 mi||56 min||84°F||1015.6 hPa|
|42085 - Southeast of Ponce, PR||35 mi||98 min||E 16 G 19||85°F||84°F||1013.5 hPa (-1.0)|
|41053 - San Juan, PR||35 mi||68 min||E 14 G 16||83°F||1014.6 hPa|
|CLBP4 - 9752235 - Culebra, PR||37 mi||50 min||82°F||85°F||1015.8 hPa|
Wind History for Yabucoa Harbor, 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||30 mi||42 min||E 11||10.00 mi||Partly Cloudy||83°F||75°F||79%||1015.5 hPa|
Wind History from JSJ (wind in knots)
|1 day ago||E||NE|
|2 days ago||E||E||E||E||E||SE||E||E||E||E||E||E||E||E||E||E|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Puerto Maunabo |
Click for Map
Sun -- 02:51 AM AST 0.23 feet Low Tide
Sun -- 06:19 AM AST Sunrise
Sun -- 08:36 AM AST Moonrise
Sun -- 10:24 AM AST 0.80 feet High Tide
Sun -- 05:56 PM AST Sunset
Sun -- 08:15 PM AST Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Vieques Passage |
Click for Map
Sun -- 12:49 AM AST 0.49 knots Max Flood
Sun -- 03:39 AM AST -0.00 knots Slack
Sun -- 06:18 AM AST Sunrise
Sun -- 06:28 AM AST -0.47 knots Max Ebb
Sun -- 08:35 AM AST Moonrise
Sun -- 09:09 AM AST 0.00 knots Slack
Sun -- 12:34 PM AST 0.72 knots Max Flood
Sun -- 03:43 PM AST -0.00 knots Slack
Sun -- 05:55 PM AST Sunset
Sun -- 07:12 PM AST -0.84 knots Max Ebb
Sun -- 08:14 PM AST Moonset
Sun -- 10:53 PM AST 0.00 knots Slack
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 (18,4,5,8)(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.