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 6:08AM||Sunset 6:52PM||Thursday August 17, 2017 7:35 AM AST (11:35 UTC)||Moonrise 1:52AM||Moonset 3:13PM||Illumination 23%|
EDIT (on/off)  Help
|AMZ735 Coastal Waters Of Southern Puerto Rico Out 10 Nm- 426 Am Ast Thu Aug 17 2017 |
.small craft should exercise caution...
Today..East winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 7 seconds. Isolated Thunderstorms in the morning. Numerous showers through the day.
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.
Friday..East winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 7 seconds. Isolated showers.
Friday night..Northeast 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.
Saturday..East winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 7 seconds. Isolated Thunderstorms. Scattered showers.
Sunday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 11 seconds. Isolated showers, then isolated Thunderstorms.
Monday..Northeast winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Isolated showers.
|AMZ700 426 Am Ast Thu Aug 17 2017 |
Synopsis for puerto rico and the uS. Virgin islands waters... A surface high pressure across the central atlantic will produce moderate to locally fresh easterly winds through the rest of the week. An active tropical wave will continue to move across the region through late tonight, resulting in shower and Thunderstorm activity across the regional waters. An area of low pressure at the surface is expected to move across the caribbean sea between late Friday and Saturday.
7 Day Forecast for Marine Location Near Playita Cortada, PRHourly EDIT Help
Area Discussion for - San Juan, PR  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxca62 tjsj 170930|
area forecast discussion
national weather service san juan pr
530 am ast Thu aug 17 2017
Synopsis A tropical wave moving across the forecast area
will continue to result in showers and thunderstorms today. Tutt
low will continue west of the forecast area through late tonight
as an upper ridge builds from the north through Saturday. An area
of low pressure about 500 miles east of the lesser antilles is
expected to move across the caribbean sea on Saturday. This will
increase the potential for gusty winds and thunderstorms across
the caribbean waters.
Short term Thursday through Saturday...
unsettle weather conditions will continue to prevail throughout the
day as an upper level trough tutt low interacts with a tropical wave
moving across the local isles. The chance for showers and
thunderstorms -squally weather type- will continue to be high
particularly during the morning hours across the usvi and the
eastern half of puerto rico as well as the local waters. Shower and
thunder development across west puerto rico this afternoon will be
dependent on cloud cover. The potential for urban and small stream
flooding as well as strong gusty winds continues.
A mid to upper level ridge is expected to build across the forecast
area tonight, as the aformentioned trough aloft tutt low shifts
westward. However, the ridge pattern aloft is expected to be short-
lived as trofiness returns to the local isles on Sunday. Therefore,
as the tropical wave moves away later today and an upper level ridge
builds, a fair weather pattern is expected to prevail on Friday. The
chance for showers and thunderstorms will increase once again on
Saturday as invest 91l moves south of the area but peripheral
moisture reaches the forecast area. Based on the NHC forecast,
this area has a formation chance of 60 percent in the next 48
hours. Stay tuned.
Long term Sunday through Thursday...
another area of low pressure, invest 92l, currently has a 50
percent chance of formation through the next 5 days. This system
however is expected to encounter unfavorable upper level winds
and move close or just to the northeast of the islands on Sunday
as a tropical wave. Overall, precipitable water content will|
remain high through the first half of next week. As another
tropical wave is forecast to reach the local area on Tuesday.
Aviation MVFR or even ifr conds will remain possible at all taf
sites in shra tsra as a tropical wave and associated moisture moves
across the area. Ese winds 15 to 20 knots with gusts around 35knots.
Wx conditions are expected to improve tonight.
Marine Hazardous seas will continue today across the regional
waters due to seas between 6-8 feet and easterly winds between
15-22 kts. Strong thunderstorms with frequent lightning and gusty
winds are expected today as a tropical wave continues to exit the
local area. There is a high rip current risk for beaches across
the north, east and south coast of pr and st. Croix. Hazardous
seas are expected once again on Saturday morning as a low pressure
area moves across the caribbean sea.
Preliminary point temps pops
Sju 88 80 88 79 70 20 20 40
stt 88 79 92 80 70 30 20 40
Sju watches warnings advisories
Pr... High rip current risk through this afternoon for central
interior-north central-northeast-northwest-san juan and
Vi... High rip current risk through this afternoon for st croix.
Am... Small craft advisory until 2 pm ast this afternoon for
caribbean waters of puerto rico from 10 nm to 17n-
mona passage southward to 17n.
Small craft advisory until 8 pm ast this evening for anegada
passage southward to 17n-coastal waters of northern puerto
rico out 10 nm-coastal waters of northern usvi and culebra
out 10 nm-coastal waters of southern usvi vieques and
eastern puerto rico out 10 nm.
Small craft advisory until 2 am ast Friday for atlantic waters
of puerto rico and usvi from 10 nm to 19.5n.
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|
|42085 - Southeast of Ponce, PR||9 mi||66 min||ENE 16 G 21||79°F||1012.6 hPa|
|JOXP4 - Jobos Bay Reserve, Puerto Rico||12 mi||111 min||E 1.9||77°F||1014 hPa||75°F|
|IMGP4||31 mi||26 min||E 17 G 26||79°F||1012.3 hPa|
|MGIP4 - 9759110 - Magueyes Islands, PR||32 mi||48 min||SE 5.1 G 11||79°F||85°F||1012.8 hPa|
|YABP4 - 9754228 - Yabucoa Harbor, PR||33 mi||48 min||NE 1 G 4.1||80°F|
|AROP4 - 9757809 - Arecibo, PR||37 mi||48 min||E 7 G 11|
|SJNP4 - 9755371 - San Juan, PR||38 mi||54 min||ENE 6 G 11||79°F||84°F||1014.5 hPa|
|41053 - San Juan, PR||39 mi||66 min||E 12 G 14||80°F||1013.3 hPa|
|MGZP4 - 9759394 - Mayaguez, PR||41 mi||54 min||SE 1 G 1.9||78°F||1012.5 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||7 mi||1.8 hrs||ESE 10||8.00 mi||Thunderstorm Light Rain||77°F||77°F||100%||1013.5 hPa|
Wind History from JPS (wind in knots)
|1 day ago||NE||NE||NE|
|2 days ago||E||E||E||E||E||NE|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Playa Cortada |
Click for Map
Thu -- 01:38 AM AST 0.79 feet High Tide
Thu -- 01:51 AM AST Moonrise
Thu -- 06:08 AM AST Sunrise
Thu -- 07:20 AM AST -0.16 feet Low Tide
Thu -- 03:13 PM AST Moonset
Thu -- 06:50 PM AST Sunset
Thu -- 08:08 PM AST 0.90 feet High Tide
Thu -- 09:19 PM AST 0.79 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Playa de Ponce |
Click for Map
Thu -- 01:52 AM AST Moonrise
Thu -- 06:09 AM AST Sunrise
Thu -- 08:39 AM AST 0.11 feet Low Tide
Thu -- 03:13 PM AST Moonset
Thu -- 06:51 PM AST Sunset
Thu -- 07:44 PM AST 1.05 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.