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 6:29PM||Saturday February 24, 2018 11:49 PM AST (03:49 UTC)||Moonrise 1:15PM||Moonset 1:38AM||Illumination 74%|
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|AMZ712 Coastal Waters Of Northern Puerto Rico Out 10 Nm- 926 Pm Ast Sat Feb 24 2018 |
.small craft advisory in effect through Sunday afternoon...
Rest of tonight..East winds 10 to 15 knots. Seas 6 to 8 feet with occasional seas up to 10 feet. Dominant period 9 seconds. Northeast swell around 4 feet. Scattered showers.
Sunday..East winds 10 to 15 knots. Seas 5 to 7 feet with occasional seas up to 9 feet. Dominant period 8 seconds. Northeast swell around 4 feet. Numerous showers through the day. Isolated Thunderstorms in the afternoon.
Sunday night..Northeast winds 10 to 15 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 8 seconds. Numerous showers.
Monday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Numerous showers.
Monday night..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 after midnight. Numerous showers.
Tuesday..Northeast winds 5 to 10 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 8 seconds. Scattered showers.
Wednesday..Northeast winds 10 to 15 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 12 seconds. Northeast swell 4 to 6 feet. Scattered showers.
Thursday..East winds 5 to 10 knots. Seas 5 to 7 feet with occasional seas up to 9 feet. Dominant period 13 seconds. Northeast swell 5 to 7 feet. Isolated showers.
|AMZ700 926 Pm Ast Sat Feb 24 2018 |
Synopsis for puerto rico and the uS. Virgin islands waters... Moderate to fresh east northeast winds generated by a surface high pressure over the western atlantic, will maintain hazardous seas across the regional waters and local passages through the rest of the weekend. A long dominant period northerly swell is forecast to arrive across the local atlantic waters by the middle of next week, increasing hazardous sea conditions.
7 Day Forecast for Marine Location Near Lomas, PRHourly EDIT Help
Area Discussion for - San Juan, PR  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxca62 tjsj 250149|
area forecast discussion
national weather service san juan pr
949 pm ast Sat feb 24 2018
Update An isolated thunderstorm with numerous showers developed
this evening over the mona passage just south of mona island. This
activity was aided by a tutt near the dominican republic. Trade
wind showers continued over the local atlantic waters and the
waters from eastern pr to the anegada passage, with a few
affecting portions of the islands as they streamed westward. For
the rest of the overnight hours... Same pattern of trade wind
showers are expected to prevail with some enhancement by the
meandering tutt to the northwest of the region. On Sunday, better
moisture content is forecast to move across the region and showers
will be heavy at times with thunderstorm development once again
possible over portions of the interior and southwestern pr and
during the evening hours over the western waters of pr.
Aviation MainlyVFR conds expected to prevail during the next
24 hours across all terminals. However, trade wind shra could
result in tempo MVFR across the leeward usvi and eastern pr
terminals through Sunday morning. Latest 25 00z indicated e-ene
winds between 8-21 kts below fl100.
Marine Seas will continue to subside through Sunday and all
small craft advisories will expire by Sunday afternoon across all
regional waters. However a long period northeast swell will
increase seas once again by midweek next week. Moderate trades
around 10-15 kt will prevail from the east to northeast during the
next several days.
A high risk of rip currents will continue on Sunday across the
northern beaches of pr, culebra and st. Croix.
Prev discussion issued 429 pm ast Sat feb 24 2018
synopsis... Surface high pressure will hold across the western
atlantic just north of the area while weakening over the rest of
weekend and into early next week. As a result winds will continue
to diminish and hazardous marine conditions to subside. An upper
level trough will linger west of the region over hispaniola and
jamaica until early in the week. This will result in favorable
conditions for the development of showers across the local
Short term... Tonight through Monday...
latest radar observations as well as satellite images depicted
scattered showers across the atlantic waters moving from time to
time across the local islands. This activity will continue to
affect mostly the u.S. Virgin islands, vieques, culebra as well
the northern and eastern sections of puerto rico tonight and
Sunday morning with brief periods of moderate to locally heavy
rain possible. As a result some areas may observe ponding of
water along roads and poorly drained areas. Showers and possible a
couple of thunderstorms are also expected to develop across the
interior and western sections of puerto rico Sunday and Monday
A surface high pressure will hold across the western atlantic
north of region while weakening until early next week. This
feature is expected to maintain an east to east northeast low
level wind flow across the region for the next several days.
At the same time, a mid to upper level trough and a subtropical
jet is expected to linger close to the region in a favorable|
position for the development of showers and possible thunderstorms
until at least Monday. A drying trend is expected across the
forecast area starting on Tuesday.
Long term... Tuesday through Sunday...
surface high pressure will fade in the western atlantic just
north of the local area by Tuesday, but will be replaced by a
second high moving out of the eastern united states Wednesday
through Thursday with continued brief shower activity across the
local islands. A mid level ridge is forecast to build across the
southwestern atlantic by mid next week and hold through at least
the end of the work week. This will limit shower activity area-
wide. Therefore, very stable atmospheric conditions are forecast
to prevail across the region during the long term period.
Aviation... Sct-bkn cld lyrs nr fl025..Fl050... Fl090 durg prd with
passing shra at tjsj tist tisx tjbq and en route btw pr and nrn
leeward islands. Slight chance of isld tsra vcty tjmz tjps til
24 22z with tempo MVFR psbl in shra. Sfc winds fm ene 15-20 knots,
with ocnl higher gusts til 24 23z. L lvl winds ene btw 20-30 kts blo
fl200... Bcmg fm SW incr W ht abv... MAX wnd 80-100 kts NE of pr btw
Marine... Local buoys were indicating seas between 6-8 feet at around
9 seconds period this afternoon. Seas will continue to decrease
tonight through the rest of weekend. For those reasons, the high
surf advisory was cancelled but rough breaking wave action will
continue to result in life threatening rip currents along the
northern exposed beaches of pr and portions of the smaller islands
through the rest of weekend.
Preliminary point temps pops
Sju 81 72 81 72 60 60 60 70
stt 82 71 82 72 60 60 60 70
Sju watches warnings advisories
Pr... High rip current risk through Sunday afternoon for culebra-north
central-northeast-northwest-san juan and vicinity-southeast-
High rip current risk until 6 am ast Sunday for mayaguez and
Vi... High rip current risk through Sunday afternoon for st croix.
Small craft advisory until 8 am ast Sunday for st.Thomas... St.
John... And adjacent islands.
Am... Small craft advisory until 8 am ast Sunday for caribbean waters
of puerto rico from 10 nm to 17n-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 pm ast Sunday for anegada passage
southward to 17n-atlantic waters of puerto rico and usvi
from 10 nm to 19.5n-coastal waters of northern puerto rico
out 10 nm-mona passage southward to 17n.
Small craft advisory until 2 am ast Sunday for coastal waters of
northwestern puerto rico out 10 nm.
Short term... Ds
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|
|41053 - San Juan, PR||16 mi||49 min||E 16 G 19||77°F||78°F||6 ft||1018.4 hPa (+0.8)|
|SJNP4 - 9755371 - San Juan, PR||16 mi||49 min||78°F||1019.4 hPa (+0.8)|
|YABP4 - 9754228 - Yabucoa Harbor, PR||16 mi||49 min||74°F|
|41056||25 mi||49 min||E 14 G 16||77°F||4 ft||1019 hPa (+1.0)|
|JOXP4 - Jobos Bay Reserve, Puerto Rico||27 mi||64 min||NNE 4.1||74°F||1019 hPa||65°F|
|CLBP4 - 9752235 - Culebra, PR||33 mi||49 min||74°F||79°F||1019.2 hPa (+0.8)|
|AROP4 - 9757809 - Arecibo, PR||43 mi||49 min||SE 2.9 G 4.1|
|42085 - Southeast of Ponce, PR||43 mi||109 min||NNE 9.7 G 12||78°F||78°F||1017.7 hPa (+1.4)|
Wind History for Fajardo, 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||11 mi||53 min||ENE 11||10.00 mi||Partly Cloudy||75°F||69°F||82%||1019.3 hPa|
Wind History from JSJ (wind in knots)
|1 day ago||E|
|2 days ago||E|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Boca De Cangrejos |
Click for Map
Sat -- 01:38 AM AST Moonset
Sat -- 04:45 AM AST 1.36 feet High Tide
Sat -- 06:46 AM AST Sunrise
Sat -- 11:13 AM AST 0.61 feet Low Tide
Sat -- 01:14 PM AST Moonrise
Sat -- 03:23 PM AST 0.83 feet High Tide
Sat -- 06:28 PM AST Sunset
Sat -- 10:12 PM AST -0.09 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Vieques Passage |
Click for Map
Sat -- 01:36 AM AST Moonset
Sat -- 01:46 AM AST 0.00 knots Slack
Sat -- 05:23 AM AST 0.82 knots Max Flood
Sat -- 06:44 AM AST Sunrise
Sat -- 08:47 AM AST -0.00 knots Slack
Sat -- 12:12 PM AST -0.82 knots Max Ebb
Sat -- 01:13 PM AST Moonrise
Sat -- 03:59 PM AST 0.00 knots Slack
Sat -- 06:23 PM AST 0.38 knots Max Flood
Sat -- 06:26 PM AST Sunset
Sat -- 08:56 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 (22,6,7,8)(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.