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 6:25AM||Sunset 6:39PM||Friday March 24, 2017 7:59 PM AST (23:59 UTC)||Moonrise 3:48AM||Moonset 3:34PM||Illumination 7%|
EDIT (on/off)  Help
|AMZ735 Coastal Waters Of Southern Puerto Rico Out 10 Nm- 348 Pm Ast Fri Mar 24 2017 |
Tonight..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Scattered showers and isolated Thunderstorms.
Saturday..Southeast winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Southeast swell around 4 feet. Scattered showers and isolated Thunderstorms.
Saturday night..Southeast winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Southeast swell around 4 feet. Scattered showers and isolated Thunderstorms.
Sunday..Southeast winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Isolated Thunderstorms in the morning. Scattered showers through the day.
Sunday night..Southeast winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers.
Monday..Southeast winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Isolated showers.
Tuesday..Northwest winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Isolated showers.
Wednesday..Northeast winds 5 to 10 knots. Seas 2 feet or less. Dominant period 7 seconds. Isolated showers.
|AMZ700 348 Pm Ast Fri Mar 24 2017 |
Synopsis for puerto rico and the uS. Virgin islands waters... Light to moderate east to southeast winds are expected today and will become southerly through the weekend as a surface low is forecast to develop north of hispaniola. A large northerly swell generated by the low in the western atlantic is expected to impact our local atlantic waters and passages by late tonight. This will again create hazardous and building seas over the the weekend.
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 241937|
area forecast discussion
national weather service san juan pr
337 pm ast Fri mar 24 2017
Synopsis Upper trough and deep moisture will keep cloudiness
and rain over the local area for the rest of today and on
Saturday. Sfc low developing at the north of hispaniola will cause
the moist southerly flow to continue for the next few days.
Short term Friday afternoon through Monday... The upper level
trough over cuba has maintained an associated jet to the north of
puerto rico and the u.S. Virgin islands, but divergence associated
with that jet has split around puerto rico such that convection was
sustained over and now just east of saint croix and north of puerto
rico almost outside of the northern boundary of the forecast area.
This lack of divergence over land will continue through Saturday
with exception of some weak divergence over eastern puerto rico and
some weak divergence moving in from the southwest Saturday night
into Sunday. Also the trough will broaden and weaken as the trough
pulls across hispaniola and the jet itself will also weaken.
Southwest flow will continue at most levels above the surface and
patches of moisture will move through a weakness in the moisture
over puerto rico and the u.S. Virgin islands through Monday. The
axis of best moisture however will remain southeast of the area in a
northeast southwest line that will favor better rainfall over
eastern puerto rico including culebra and vieques and also the u.S.
Virgin islands later tonight and Saturday. Drier air will intrude
from the southwest on Sunday displacing the moisture farther east.
This plume of moisture will continue across the leeward islands
beyond the short term.
Flow at the surface is east southeast but will turn to the southeast
on Saturday as low pressure develops north of the eastern end of the
dominican republic. This will aid in bringing patches of low level
moisture over the area. GFS has been consistent with bringing the
highest precipitable water values over the area also on Saturday.
Low level flow turns southwest of Monday and will continue to feed
good moisture across puerto rico, the u.S. Virgin islands and the
leeward islands on Monday. Although moderate amounts of rain are
expected each day Saturday and Sunday, soils will begin to become
saturated by Sunday. Should cells develop in a band that moves
slowly or remains stationary urban and small stream flooding could
develop anytime Saturday, Sunday or Monday. Winds will remain
below 15 mph but generally much lighter.
Long term The deep moisture is still expected to remain over
the local area until next Wednesday, the sfc low pressure
develops north of the bahamas, which will keep pulling moisture
across our area from the south early on upcoming week as it moves
to the east. The latest model guidance indicates that the bulk of
the moisture will affect the southern and eastern portions of our|
forecast area as the sfc low moves east and a frontal boundary
pushes through. Being that this is the long term forecast, and
model verification has not been stellar lately, confidence is
generally low, in this case particularly on the exact area where
the deepest moisture will be and its impact in the local area is
still uncertain. Overall, it looks like we will have a rather
rainy pattern for the local islands over the next several days
through Tuesday, drying up on Wednesday and for the rest of the
Aviation Vfr conds across tncm/tkpk til 25/14z, MVFR cigs
possible afterward. Shra have moved east of the usvi andVFR
conds are expected. LCL MVFR conds cannot be ruled out thru
26/00z. Mtn obscurations will cont over pr thru 26/00z. Although
bands of +ra/ and isold tsra are north and east of the usvi and
pr, shra have begun to develop over the NRN foothills of pr to
increase thru 25/21z. Isold tsra psbl. SW flow abv the sfc will
cont deep mstr and bands of shra will likely form and move over pr
thru 25/22z with tsra psbl aft 25/14z.
Marine Small craft operators should exercise caution due to
seas up to 6 feet tonight. However, seas will go up to 7 or 8
feet starting late tonight across the offshore atlantic waters.
Then up to 8 feet on Friday across the local passages and the
nearshore waters. There is a moderate risk of rip currents this
evening but a high risk of rip currents on Friday across many of
the north facing beaches of pr, culebra, vieques and saint
Preliminary point temps/pops
Sju 72 81 73 86 / 50 60 50 50
stt 73 81 74 81 / 60 70 50 50
Pr... Vi... Small craft advisory from 2 pm Saturday to 8 am ast Sunday for
st.Thomas... St. John... And adjacent islands.
Am... Small craft advisory from 2 pm Saturday to 2 pm ast Sunday for
anegada passage southward to 17n.
Small craft advisory from 8 am Saturday to 2 pm ast Sunday for
coastal waters of northern puerto rico out 10 nm-mona
passage southward to 17n.
Small craft advisory from 2 pm Saturday to 8 am ast Sunday for
coastal waters of northern usvi and culebra out 10 nm.
Small craft advisory from 8 am Saturday to 8 am ast Sunday for
coastal waters of northwestern puerto rico out 10 nm.
Small craft advisory from 2 am Saturday to 8 pm ast Sunday for
atlantic waters of puerto rico and usvi from 10 nm to 19.5n.
Short term... Ws
long term... .Ja
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||59 min||E 5.8 G 7.8||77°F||80°F||3 ft||1012.3 hPa (+0.3)|
|JOXP4 - Jobos Bay Reserve, Puerto Rico||12 mi||74 min||Calm||73°F||1014 hPa||71°F|
|IMGP4||31 mi||24 min||SSE 1.9 G 6||77°F||1012.8 hPa|
|MGIP4 - 9759110 - Magueyes Islands, PR||32 mi||41 min||SSW 8.9 G 11||78°F||81°F||1013.1 hPa|
|YABP4 - 9754228 - Yabucoa Harbor, PR||33 mi||41 min||E 13 G 16|
|AROP4 - 9757809 - Arecibo, PR||37 mi||41 min||Calm G 1||76°F|
|SJNP4 - 9755371 - San Juan, PR||38 mi||41 min||SE 11 G 14|
|41053 - San Juan, PR||39 mi||59 min||ESE 7.8 G 12||79°F||80°F||4 ft||1012.5 hPa (+0.6)|
|MGZP4 - 9759394 - Mayaguez, PR||41 mi||41 min||S 4.1 G 7|
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
Wind History from JPS (wind in knots)
|1 day ago||Calm||NE||E||E||E||S||E||NE||E||NE||NE|
|2 days ago||Calm||Calm||Calm||E||S||Calm||Calm||Calm||Calm||Calm||Calm|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Playa Cortada |
Click for Map
Fri -- 03:48 AM AST Moonrise
Fri -- 06:26 AM AST Sunrise
Fri -- 07:56 AM AST 0.70 feet High Tide
Fri -- 08:53 AM AST 0.51 feet Low Tide
Fri -- 03:33 PM AST Moonset
Fri -- 06:08 PM AST 0.66 feet High Tide
Fri -- 06:37 PM AST Sunset
Fri -- 08:55 PM AST 0.04 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
Fri -- 03:48 AM AST Moonrise
Fri -- 06:27 AM AST Sunrise
Fri -- 07:17 AM AST 0.54 feet High Tide
Fri -- 03:34 PM AST Moonset
Fri -- 06:38 PM AST Sunset
Fri -- 10:58 PM AST 0.02 feet Low 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 (19,4,5,8)(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.