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 6:06AM||Sunset 6:50PM||Thursday August 17, 2017 1:52 AM AST (05:52 UTC)||Moonrise 1:51AM||Moonset 3:13PM||Illumination 26%|
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|AMZ735 Coastal Waters Of Southern Puerto Rico Out 10 Nm- 857 Pm Ast Wed Aug 16 2017 |
.small craft should exercise caution...
Rest of tonight..East winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 7 seconds. Scattered showers in the evening. Isolated Thunderstorms through the night.
Thursday..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, then isolated showers in the afternoon.
Thursday night..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 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.
Saturday..East winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 7 seconds. 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 857 Pm Ast Wed Aug 16 2017 |
Synopsis for puerto rico and the uS. Virgin islands waters... A high pressure across the central atlantic will produce moderate to locally fresh easterly winds through the week. An active tropical wave is forecast to move across the region tonight and Thursday, increasing the shower and Thunderstorm activity across the regional waters.
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 170147|
area forecast discussion
national weather service san juan pr
947 pm ast Wed aug 16 2017
Update Numerous showers with thunderstorms affected the local
islands tonight. Heavy rainfall with strong gusty winds were
observed with the heaviest activity. This activity is associated
with the leading edge of an active tropical wave which will
approach the local islands overnight. As a result, active weather
will continue through at least Thursday afternoon. Forecast is on
track with ongoing weather situation.
Aviation MainlyVFR conditions will prevail across most taf
sites through at least 17 12z. Vcsh are expected across most taf
sites. Periods of MVFR conditions can be expected across tncm
and tkpk in tsra. Low level winds will continue mainly east at 10
to 15 kts with higher gusts.
Marine Seas up to 7 feet and winds up to 20 knots are expected
to continue through at least Thursday night. Showers and
thunderstorms will maintain hazardous marine conditions across the
local waters. Refer to marine products for latest information.
Prev discussion issued 438 pm ast Wed aug 16 2017
synopsis... A tropical wave just across the eastern caribbean
will move across the forecast area tonight through Thursday. Tutt
low will continue just to the west- northwest of the forecast area
through Friday as an upper ridge builds from the north. Saharan
air layer will gradually diminish tonight ahead of the tropical
Short term... Tonight through Friday...
a mid to upper level ridge is expected to build across the
forecast area Thursday night, as a trough aloft tutt across the
northeast caribbean shifts westward. At lower levels, a broad
high pressure across the central atlantic will continue to produce
a moderate to fresh easterly winds through the forecast period.
An active tropical wave across the lesser antilles this afternoon
will continue to move westward moving across the local islands
tonight and Thursday. The moisture associated with the leading
edge of the wave in combination with daytime heating and local
effects will continue to induce the development of shower and
thunderstorm activity across the u.S. Virgin islands, vieques,
culebra, puerto rico and the surrounding waters for the rest of
this afternoon and evening. The chance for showers and thunderstorms
will increase across the forecast area tonight into Thursday due
to the proximity of tutt low and the tropical wave moving across
the local islands.
Urban and small stream flooding likely. Shower and thunder
development across west puerto rico Thursday afternoon will be
dependent on cloud cover. As the tropical wave moves away and an
upper level ridge builds, a fair weather pattern is then expected
to prevail on Friday.
Long term... Saturday through Wednesday... Previous discussion...
in the medium range, an area of low pressure near 48w longitude,
which the national hurricane center is giving a 40% chance of
formation during the next 5 days... Is forecast to move across the
caribbean sea between Friday and Saturday... And remain south of
the islands. Another area of low pressure near 35w longitude,
that NHC is also giving a 40% chance of formation during the next
5 days, is currently expected to move close to the forecast area
late in the weekend. In the long range, latest runs of both gfs
and ECMWF runs indicated a surface low pressure area passing well
to the northeast of the forecast area by midweek.
Aviation... Approaching tropical wave is bringing shra tsra to the
local area. Intermittent brief moment of shra tsra over the local
terminals is expected, some of which could cause at least MVFR conds
for brief moments at a time. Mainly vcsh vcts written on TAF due to
uncertainty on timing, amd with tempo as necessary. Winds will
remain at about 15-20kt with occasional gusts. CIGS will be at about
fl040 but lower in shra tsra. Wx conditions across the local
terminals to be unsettled through Thursday night.
Marine... Seas are expected to increase tonight between 6-8 feet
across the anegada passage and across both atlantic and caribbean
offshore waters through at least Thursday. Small craft advisories
are in effect. East to northeast winds between 15 to 20 knots will
prevail tonight. Squally weather is possible tonight and Thursday
as the wave moves across the local area. A high risk of rip
currents is in effect for northwest and north central beaches of
puerto rico and for st. Croix.
Preliminary point temps pops
Sju 79 88 80 87 60 60 20 20
stt 80 89 80 92 60 60 30 20
Sju watches warnings advisories
Pr... High rip current risk until 6 am ast Thursday for north central-
Vi... Small craft advisory until 8 pm ast Thursday for st.Thomas... St.
John... And adjacent islands.
High rip current risk until 6 am ast Thursday for st croix.
Am... Small craft advisory until 8 pm ast Thursday for anegada passage
southward to 17n-atlantic waters of puerto rico and usvi
from 10 nm to 19.5n-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 Thursday for caribbean
waters of puerto rico from 10 nm to 17n-mona passage
southward to 17n.
Small craft advisory from 2 am to 2 pm ast Thursday for coastal
waters of northern puerto rico out 10 nm.
Short term... Fc
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|
|JOXP4 - Jobos Bay Reserve, Puerto Rico||4 mi||67 min||NE 2.9||80°F||1014 hPa||74°F|
|42085 - Southeast of Ponce, PR||13 mi||82 min||ENE 7.8 G 9.7||84°F||1012.1 hPa|
|YABP4 - 9754228 - Yabucoa Harbor, PR||26 mi||52 min||ENE 12 G 18||82°F|
|SJNP4 - 9755371 - San Juan, PR||37 mi||52 min||E 16 G 19||83°F||85°F||1013.4 hPa (-0.9)|
|41053 - San Juan, PR||38 mi||112 min||ENE 19 G 23||83°F||84°F||5 ft||1013.2 hPa (-0.8)|
|IMGP4||39 mi||32 min||N 1.9 G 4.1||79°F||1012.3 hPa|
|MGIP4 - 9759110 - Magueyes Islands, PR||40 mi||52 min||NE 4.1 G 6||80°F||85°F||1012.9 hPa (-0.9)|
|AROP4 - 9757809 - Arecibo, PR||43 mi||52 min||SE 4.1 G 5.1|
|ESPP4 - 9752695 - Esperanza, PR||45 mi||52 min||SE 16 G 24||83°F||84°F||1013 hPa (-1.3)|
|FRDP4 - 9753216 - Fajardo, PR||45 mi||52 min||E 18 G 22||82°F||77°F|
|VQSP4 - 9752619 - Isabel Segunda, Vieques, PR||48 mi||52 min||SE 4.1 G 8||79°F|
|MGZP4 - 9759394 - Mayaguez, PR||49 mi||52 min||NNE 2.9 G 4.1||79°F||1013.5 hPa (-0.9)|
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||2 hrs||NE 5||8.00 mi||Mostly Cloudy||82°F||73°F||74%||1014.9 hPa|
Wind History from JPS (wind in knots)
|1 day ago||E||E||NE||NE||NE|
|2 days ago||NE||Calm||NE||E||E||E |
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
|Las Mareas |
Click for Map
Thu -- 01:50 AM AST Moonrise
Thu -- 06:07 AM AST Sunrise
Thu -- 08:42 AM AST -0.05 feet Low Tide
Thu -- 03:12 PM AST Moonset
Thu -- 06:49 PM AST Sunset
Thu -- 08:14 PM AST 0.83 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 (1,6,7,8)(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.