Marine Weather and Tides
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.
|Sunrise 5:58AM||Sunset 6:45PM||Wednesday April 26, 2017 7:57 AM AST (11:57 UTC)||Moonrise 6:13AM||Moonset 7:08PM||Illumination 0%|
EDIT (on/off)  Help
|AMZ735 Coastal Waters Of Southern Puerto Rico Out 10 Nm- 509 Am Ast Wed Apr 26 2017 |
Today..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers.
Tonight..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers through the night.
Thursday..East winds 15 to 20 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers.
Thursday night..East winds 15 to 20 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers through the night.
Friday..East winds 15 to 20 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers.
Saturday..East winds 15 to 20 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers.
Sunday..East winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Isolated showers.
|AMZ700 509 Am Ast Wed Apr 26 2017 |
Synopsis for puerto rico and the uS. Virgin islands waters... Strong surface high pressure is expected to remain across the north central atlantic for the rest of the week. A surface low pressure is forecast to move across the mid atlantic coast of the united states into the northwest atlantic through the end of the work week. This will hold a plume of moisture from the south over the area bringing isolated Thunderstorms. Moderate to fresh southeasterly winds will prevail through Thursday...becoming more easterly through the end of the week. Seas will continue to diminish and remain below 5 feet for much of the forecast period.
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 260918|
area forecast discussion
national weather service san juan pr
518 am ast Wed apr 26 2017
Synopsis Ridge at the surface across the atlantic will continue
for the next several days. Southeast winds continue through
Thursday, becoming east-northeast through next week. Upper ridge
builds west of the area and across the central caribbean. Tutt
develops northeast of the area during the weekend and persist
through early next week.
Short term Wednesday through Friday...
mostly cloudy skies prevailed overnight and early this morning
across the local islands. Showers were observed across the regional
waters as well as over coastal municipalities of puerto rico.
Rainfall accumulations associated with these showers were between
one and three inches. Temperatures were in the upper 70s to low 80s
at the lower elevations.
Although the upper level trough across the central atlantic and into
the northeast caribbean will continue to shift east and away from the
forecast area today, another trough aloft, a tutt, is expected to
establish north of the area by Friday. At lower levels, a moist
southeasterly wind flow will continue to prevail today, becoming
more easterly Thursday and into the upcoming weekend as a surface
high across the north central atlantic relocates across the central
atlantic. Latest guidance continues to suggest a decrease in
precipitable water during the next two days or so, but remaining
above the normal range.
As a result, continue to expect passing showers across the coastal
areas of puerto rico as well as usvi during the morning hours with
shower and thunder activity increasing across the forecast area in
the afternoon. These showers and thunderstorms are expected mainly
across the northwest quadrant of the island as well as portions of
the san juan metro area. With the heaviest showers, urban flooding
likely. A similar pattern should prevail Thursday and Friday,
although morning showers will be focused across E pr and usvi.
Long term Saturday through Thursday...
tutt pattern to the northeast is expected to provide instability
across the area to aid the development of showers and possible|
isolated thunderstorms during Saturday afternoon across the
interior and western portions of pr. Pwat content erodes quickly
on Sunday and best moisture content remains below 800 mb through
the end of the forecast period. This in response to trade wind cap
as ridge pattern dominates the western atlantic. Therefore, best
chances for showers are during the weekend across the islands.
During the week, limited shower activity is expected across the
region... With brief periods of trade wind showers across the
usvi's and the north and eastern portions of pr at times and
localized afternoon shallow convection over west/southwest pr.
Aviation Vfr conds expected to prevail this morning at the
leeward and usvi terminals with shra possible in and around jsj.
Shra/tsra development expected aft 26/16z to result in brief periods
of MVFR conds in and around jbq/jmz and possibly jsj through 26/22z.
Southeasterly winds at 10 to 15 knots with sea breeze variations,
becoming light and variable overnight.
Marine Coastal buoys across the islands are indicating seas
between 2-4 feet and east-southeast winds at 5-10 knots. Higher
gusts were observed with showers and thunderstorms across the
atlantic waters and the southwestern coastal waters of puerto
rico. Seas should continue between 3-5 feet and east to
southeasterly winds up to 15 knots. Moderate risk of rip currents
continue for the northern and southern coasts of the islands.
Preliminary point temps/pops
Sju 90 77 87 76 / 30 30 30 30
stt 86 76 86 76 / 40 30 30 30
Short term... Om
long term... .Ds
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|
|JOXP4 - Jobos Bay Reserve, Puerto Rico||4 mi||73 min||NNE 2.9||76°F||1014 hPa||72°F|
|YABP4 - 9754228 - Yabucoa Harbor, PR||26 mi||40 min||ENE 6 G 11|
|SJNP4 - 9755371 - San Juan, PR||37 mi||46 min||E 6 G 8||78°F||81°F||1014.3 hPa|
|41053 - San Juan, PR||38 mi||58 min||ENE 9.7 G 12||78°F||80°F||5 ft||1013.4 hPa (+1.4)|
|IMGP4||39 mi||23 min||E 4.1 G 6||81°F|
|MGIP4 - 9759110 - Magueyes Islands, PR||40 mi||40 min||ESE 1 G 5.1||79°F||81°F||1013.7 hPa|
|AROP4 - 9757809 - Arecibo, PR||43 mi||40 min||SE 6 G 8||76°F|
|ESPP4 - 9752695 - Esperanza, PR||45 mi||40 min||SE 13 G 16||80°F||80°F||1014.1 hPa|
|FRDP4 - 9753216 - Fajardo, PR||45 mi||40 min||SE 7 G 12||80°F||73°F|
|VQSP4 - 9752619 - Isabel Segunda, Vieques, PR||48 mi||40 min||SSE 4.1 G 6||78°F|
|MGZP4 - 9759394 - Mayaguez, PR||49 mi||46 min||E 1.9 G 5.1||78°F||83°F||1013.5 hPa|
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
|Ponce, Mercedita Airport, PR||15 mi||4.1 hrs||NE 5||8.00 mi||Mostly Cloudy||77°F||75°F||94%||1014.2 hPa|
Wind History from JPS (wind in knots)
|1 day ago||E||Calm||E||Calm||NE||NE|
|2 days ago||Calm||E||E||E||E||E||E||E |
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Playa Cortada |
Click for Map
Wed -- 06:01 AM AST Sunrise
Wed -- 06:14 AM AST Moonrise
Wed -- 08:08 AM AST 0.76 feet High Tide
Wed -- 08:18 AM AST New Moon
Wed -- 10:43 AM AST -0.04 feet Low Tide
Wed -- 06:45 PM AST Sunset
Wed -- 07:08 PM AST Moonset
Wed -- 10:33 PM AST 0.97 feet High Tide
Wed -- 11:47 PM AST 0.61 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Las Mareas |
Click for Map
Wed -- 06:00 AM AST Sunrise
Wed -- 06:12 AM AST Moonrise
Wed -- 08:18 AM AST New Moon
Wed -- 12:51 PM AST 0.03 feet Low Tide
Wed -- 06:44 PM AST Sunset
Wed -- 07:07 PM AST Moonset
Wed -- 11:20 PM AST 0.70 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 (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.