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 6:44AM||Sunset 6:27PM||Thursday February 22, 2018 10:20 PM AST (02:20 UTC)||Moonrise 11:30AM||Moonset 12:00AM||Illumination 53%|
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|AMZ725 Coastal Waters Of Southern Usvi Vieques And Eastern Puerto Rico Out 10 Nm- 911 Pm Ast Thu Feb 22 2018 |
.small craft advisory in effect through Saturday afternoon...
Rest of tonight..Northeast winds 15 to 20 knots. Seas 8 to 10 feet with occasional seas up to 13 feet. Dominant period 10 seconds. Northeast swell 4 to 9 feet. Numerous showers.
Friday..East winds 15 to 20 knots. Seas 8 to 10 feet with occasional seas up to 13 feet. Dominant period 10 seconds. Northeast swell 4 to 9 feet. Numerous showers.
Friday night..East winds 15 to 20 knots. Seas 8 to 10 feet with occasional seas up to 11 feet. Dominant period 10 seconds. Northeast swell 4 to 8 feet. Scattered showers.
Saturday..East winds 15 to 20 knots. Seas 6 to 8 feet with occasional seas up to 10 feet. Dominant period 10 seconds. Northeast swell 4 to 7 feet. Numerous showers.
Saturday night..East winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 8 seconds. East swell around 4 feet in the evening. Scattered showers.
Sunday..Northeast winds 10 to 15 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 10 seconds. Scattered showers.
Monday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 11 seconds. East swell around 4 feet. Scattered showers.
Tuesday..Northeast winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. Northeast swell around 4 feet. Scattered showers.
|AMZ700 911 Pm Ast Thu Feb 22 2018 |
Synopsis for puerto rico and the uS. Virgin islands waters... Moderate to fresh east to northeast winds generated by a strong surface high pressure over the western atlantic, will keep hazardous seas across the regional waters and passages through the weekend.
7 Day Forecast for Marine Location Near Esperanza, PRHourly EDIT Help
Area Discussion for - San Juan, PR  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxca62 tjsj 230124|
area forecast discussion
national weather service san juan pr
924 pm ast Thu feb 22 2018
Update Mostly fair weather prevailed across the local islands
through the afternoon hours with only a few showers being detected
across northern and western pr and across the usvi, leaving
minimal accumulations. However, a patch of moisture moved in and
the showers increased across the area in the evening hours. This
shower activity is expected to continue through tonight. The areas
affected will be mostly the northern half of pr and the eastern
sections as well as the northern usvi. Even though the showers may
be locally numerous, the accumulations are expected to be
generally less than a quarter of an inch of rain with isolated
areas with higher amounts.
The scattered to numerous shower activity is expected to continue
into Friday across the same areas as tonight, but in the afternoon
hours the showers may progress into the central and western sections
of pr. Expect a rainy pattern with rainfall accumulations that
would cause ponding of water on roadways and poor drainage areas.
Aviation PrevailingVFR conds with brief shra across the local
terminals tonight, with the exception of tjmz and tjps where fair
weather is expected through the night. Winds will continue from
the ene-ne at 15 kt or so with occasional gusts tonight,
increasing after 23 14z up to 20kt sustained with gusts near 30k.
Marine No changes from the previous discussion. The local
marine conditions will continue to be hazardous into the upcoming
weekend. Seas are still expected to reach wave heights of up to 12
feet and the coastal breaking waves across the northern shores
could be up to 13 feet or so. High risk of rip currents across
many of the local beaches for the next several days. There is a
high surf advisory in effect and also a small craft advisory.
Prev discussion issued 411 pm ast Thu feb 22 2018
synopsis... Strong surface high pressure over the western
atlantic just north of the region will continue to result in
breezy conditions across the region through at least Friday.
Trade wind shower pattern will continue to bring areas of showers
across the usvi and the northern sections of pr each day. Upper
level trough and associated jet maxima will move over the region
Friday through Saturday. This will increase the chances of showers
across the region.
Short term... Tonight through Saturday...
terminal doppler radar indicated isolated to scattered passing
showers moving southwestward from the atlantic waters, affecting
mostly the u.S. Virgin islands, vieques, culebra as well the
northern and eastern sections of puerto rico. This activity is
expected to continue tonight. However, rainfall amounts have been
minimal if any. The remnants of a weak frontal boundary will
continue to dissipate across the caribbean waters just south of
the region. Strong surface high pressure will hold across the
western atlantic through at least Tuesday, next week. An upper
level trough extends southwest from an upper level low across the
central atlantic, several hundred miles to our north and is
accompanied on its southern periphery by a strengthening jet. This
jet will cross the area from the southeast Friday into Saturday
morning bringing strong upper winds over the region. The strong
surface high pressure across the western atlantic will continue to
bring patches of low level moisture across the local islands for
the nest several days. This moisture will combine with the strong
upper level winds and upper trough to allow shower activity to
increase Friday and Saturday. There is also a possibility of
thunderstorms developing over puerto rico Friday and Saturday.
Although the showers in the thunderstorms could be heavy flooding
is not expected due to the rapid movement the showers. In summary,
showers will continue across the windward slopes of puerto rico
and at least the northern u.S. Virgin islands tonight and increase
through Friday night aided by the trough and jet just mentioned.
Showers should also be forced across most of puerto rico north of
the cordillera central in the moderate to fresh trade winds that
will persist through at least Saturday.
Long term... Sunday through Thursday... From previous discussion...
high pressure north of the region will hold through Tuesday|
maintaining a moderate to locally fresh east to northeast trade
wind flow across the area. Trade wind showers will continue to
move and increase in frequency during the first part of next week.
Meanwhile, upper level trough over the central caribbean will
continue to aid in the development of showers with possible
thunderstorm development through Tuesday. Urban and small stream
flooding in isolated areas will be possible with the heaviest
showers during the long term period.
Aviation...VFR conds are expected to prevail through the forecast
cycle with vcsh at the leeward and usvi terminals as well as
jsj jbq. Ene winds 15-20 knots with higher gusts, becoming at around
10-12 knots overnight.
Marine... Rough seas continue across the regional waters except
in the coastal southwestern waters of pr. Seas will range between
8-12 feet and east to northeast trades at 15-25 knots will
continue across the region. Winds will gradually decrease through
the weekend as well as the seas. However, SCA are in effect
through the weekend due to seas still reaching 7-8 feet. High
surf advisory continues for the northern beaches of pr and the
usvi through Friday afternoon. High risk of rip currents will
continue through the weekend across the northern beaches of the
Preliminary point temps pops
Sju 74 82 73 81 70 70 60 60
stt 72 82 72 83 60 50 40 30
Sju watches warnings advisories
Pr... High rip current risk through Saturday afternoon for culebra-
mayaguez and vicinity-north central-northeast-northwest-san
juan and vicinity-vieques-western interior.
High surf advisory until 6 pm ast Friday for culebra-north
central-northeast-northwest-san juan and vicinity-southeast-
High rip current risk through late Friday night for central
Small craft advisory until 8 pm ast Friday for southeast.
Vi... High rip current risk through Saturday afternoon for st croix-
st.Thomas... St. John... And adjacent islands.
High surf advisory until 6 pm ast Friday for st croix-
st.Thomas... St. John... And adjacent islands.
Small craft advisory until 8 pm ast Friday for st.Thomas... St.
John... And adjacent islands.
Am... High rip current risk through Saturday afternoon for coastal
waters of northern usvi and culebra out 10 nm-coastal
waters of southern usvi vieques and eastern puerto rico out
High surf advisory until 6 pm ast Friday for coastal waters of
northern usvi and culebra out 10 nm-coastal waters of
southern usvi vieques and eastern puerto rico out 10 nm.
High rip current risk through late Friday night for coastal
waters of southern puerto rico out 10 nm.
Small craft advisory until 8 pm ast Friday for coastal waters of
southern puerto rico out 10 nm.
Small craft advisory until 6 pm ast Saturday for caribbean
waters of puerto rico from 10 nm to 17n-coastal waters of
northwestern puerto rico out 10 nm-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-mona passage
southward to 17n.
Small craft advisory until 2 pm ast Sunday for anegada passage
southward to 17n-atlantic waters of puerto rico and usvi
from 10 nm to 19.5n.
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|
|41056||10 mi||51 min||ENE 18 G 23||78°F||1021.3 hPa|
|CLBP4 - 9752235 - Culebra, PR||15 mi||51 min||76°F||79°F||1021.5 hPa|
|YABP4 - 9754228 - Yabucoa Harbor, PR||20 mi||51 min||78°F|
|41052 - South of St. John, Virgin Islands||38 mi||81 min||ENE 19 G 23||78°F||5 ft||1019.5 hPa (+1.6)|
|LAMV3||41 mi||51 min||77°F||78°F|
|SJNP4 - 9755371 - San Juan, PR||42 mi||51 min||78°F||1021.8 hPa|
|JOXP4 - Jobos Bay Reserve, Puerto Rico||42 mi||96 min||NE 5.1||75°F||1021 hPa||64°F|
|41053 - San Juan, PR||42 mi||51 min||ESE 18 G 21||75°F||1020.8 hPa|
Wind History for Isabel Segunda, Vieques Island, PR(wind in knots) EDIT (on/off)  Help
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|Vieques Island |
Click for Map
Thu -- 01:35 AM AST 0.50 feet High Tide
Thu -- 02:43 AM AST 0.50 feet Low Tide
Thu -- 04:41 AM AST 0.51 feet High Tide
Thu -- 05:48 AM AST 0.50 feet Low Tide
Thu -- 06:45 AM AST Sunrise
Thu -- 09:29 AM AST 0.53 feet High Tide
Thu -- 11:29 AM AST Moonrise
Thu -- 06:19 PM AST 0.06 feet Low Tide
Thu -- 06:25 PM AST Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Vieques Passage |
Click for Map
Thu -- 12:10 AM AST 0.00 knots Slack
Thu -- 03:36 AM AST 0.78 knots Max Flood
Thu -- 06:45 AM AST Sunrise
Thu -- 06:56 AM AST -0.00 knots Slack
Thu -- 10:13 AM AST -0.75 knots Max Ebb
Thu -- 11:30 AM AST Moonrise
Thu -- 01:50 PM AST 0.00 knots Slack
Thu -- 04:19 PM AST 0.40 knots Max Flood
Thu -- 06:26 PM AST Sunset
Thu -- 06:53 PM AST -0.00 knots Slack
Thu -- 10:02 PM AST -0.56 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 (21,6,7,8)(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.