Marine Weather and Tides
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
|Sunrise 5:50AM||Sunset 7:05PM||Thursday June 21, 2018 1:04 AM AST (05:04 UTC)||Moonrise 1:37PM||Moonset 1:10AM||Illumination 53%|
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|AMZ735 Coastal Waters Of Southern Puerto Rico Out 10 Nm- 929 Pm Ast Wed Jun 20 2018 |
Rest of tonight..Southeast winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated Thunderstorms in the evening. Scattered showers through the night.
Thursday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers.
Thursday night..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers through the night.
Friday..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Scattered showers and isolated Thunderstorms.
Friday night..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Scattered 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, then isolated Thunderstorms.
Sunday..East winds 15 to 20 knots. Seas 5 to 7 feet with occasional seas up to 9 feet. Dominant period 7 seconds. Isolated Thunderstorms, then isolated showers.
Monday..East winds 15 to 20 knots. Seas 5 to 7 feet with occasional seas up to 9 feet. Dominant period 7 seconds. Isolated showers.
|AMZ700 929 Pm Ast Wed Jun 20 2018 |
Synopsis for puerto rico and the uS. Virgin islands waters... Surface high pressure located across the northeastern atlantic will continue to promote moderate east to southeasterly winds during the next several days. Shower and Thunderstorm activity will continue across the regional waters through at least midnight, diminishing in coverage afterwards. The next tropical wave will approach the region by Friday afternoon, increasing the shower and Thunderstorm activity across the regional waters once again.
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 210151|
area forecast discussion
national weather service san juan pr
951 pm ast Wed jun 20 2018
Update Another active afternoon across puerto rico, mainly
across the northern half of the islands. Showers with
thunderstorms developed late this afternoon across the north
central and northwest sections of puerto rico. Rainfall
accumulations were between one to two inches in some areas. For
tonight into Thursday, a drier air mass will encompass the region.
As a result, chances of shower and thunderstorm development will
diminish. No changes to forecast grids needed as forecast is on
track with ongoing weather situation.
Aviation MainlyVFR conditions will prevail across all taf
sites through at least 20 12z. Vcsh are expected across tjps
overnight. Low level winds will continue mainly southeast at less
than 10 kts.
Marine Seas up to 5 feet and winds up to 15 kts are expected to
continue through at least Friday. Strong thunderstorms will
continue to produce hazardous marine conditions across the
offshore atlantic waters overnight.
Prev discussion issued 520 pm ast Wed jun 20 2018
synopsis... Remnant moisture associated with a departing tropical
wave will continue to gradually move away through tonight. Drier
air along with some saharan dust will move over the area Thursday
through Friday morning. Another tropical wave will move across the
eastern caribbean later Friday through Saturday. At the same
time, a tutt low will dig in from the north and be positioned
north and west of the forecast area through the upcoming weekend.
Short term... Tonight through Friday
scattered showers and thunderstorms will continue to affect
portions of the islands through the evening hours. As the trailing
moisture left behind by the departing tropical wave gradually
moves away and drier air filters in from the east, expect lesser
shower activity across the forecast area during the overnight.
Drier conditions are expected across the region during the day on
Thursday as a drier air mass moves in from the east. This drier
air mass will also carry with it some saharan dust, therefore,
hazier skies are expected. As a result of this drier air mass,
the shower activity across the forecast area will be very
limited. Only some locally and diurnally induced showers and
isolated thunderstorms are expected during the afternoon across
northwest puerto rico, while the rest of the area should see
mainly fair weather conditions.
The drier conditions will be short-lived, however, as another
tropical wave will move in across the eastern caribbean by Friday.
The deeper moisture associated with this tropical wave is expected
to filter into the forecast area by Friday afternoon. At the same
time, a tutt low will be digging in from the north and be
positioned just north of the islands. This will serve to increase|
the upper-level forcing as well as the instability. Therefore,
the potential exists for more widespread shower and thunderstorm
activity once again from Friday afternoon through Saturday.
Long term... Saturday through Wednesday... (from previous
moisture from the tropical wave that entered the area Friday will
continue through Sunday. Then drier air will move in Monday and
Tuesday. Moisture will gradually increase Tuesday through
High pressure at the surface will shift to the west central
atlantic over the weekend. This will cause winds at the surface to
become more easterly and will allow some moderation of the warm
highs that we have had on the north coast of puerto rico.
This trend will continue into the early part of the week.
At upper levels, a tutt low will be just north of puerto rico
beginning Saturday. This indicates thunderstorms with frequent
lightning will be possible. This low will move northwest and will
be replaced by a weak ridge that moves into place between another
stronger low well northeast of the area. This will also allow
showers and thunderstorms to diminish during the early part of
Aviation... Shra tsra are expected to affect tjsj tjbq tjps tist
btwn 20 16-23z. Elsewhere vcts vcsh are possible. Brief MVFR or even
ifr is possible at tjbq tist through this afternoon. Shra and tsra
will dissipate later tonight as a dry air mass reach the islands.
Winds are expected to continue from the ese-se at 10 to 15 knots
with sea breeze variations. Higher gusts are expected in near
Marine... Seas of 3 to 5 feet will continue to prevail across the
regional waters through the end of the work week. Shower and
thunderstorm activity associated with the trailing moisture of a
departing tropical wave will continue through this evening with
the activity gradually diminishing overnight. Another tropical
wave will approach the regional waters by Friday afternoon,
increasing the shower and thunderstorm activity once again.
Preliminary point temps pops
Sju 77 91 78 89 40 20 20 50
stt 79 89 79 88 20 20 30 60
Sju watches warnings advisories
Short term... Fc
long term... .Gl
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||125 min||ESE 12 G 14||86°F||83°F||4 ft||1017.3 hPa (+0.8)|
|JOXP4 - Jobos Bay Reserve, Puerto Rico||12 mi||80 min||NE 1.9||78°F||1019 hPa||75°F|
|MGIP4 - 9759110 - Magueyes Islands, PR||32 mi||65 min||ESE 4.1 G 7||80°F||84°F||1017.8 hPa (-0.0)|
|YABP4 - 9754228 - Yabucoa Harbor, PR||33 mi||65 min||80°F|
|AROP4 - 9757809 - Arecibo, PR||37 mi||65 min||S 2.9 G 4.1|
|SJNP4 - 9755371 - San Juan, PR||38 mi||65 min||81°F||83°F||1018.7 hPa (+1.1)|
|41053 - San Juan, PR||39 mi||65 min||SE 1.9 G 3.9||82°F||82°F||2 ft||1017.8 hPa (+1.0)|
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||NE||NE||NE||NE|
|2 days ago||E||E||E |
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Playa Cortada |
Click for Map
Thu -- 01:10 AM AST Moonset
Thu -- 04:00 AM AST 0.69 feet High Tide
Thu -- 05:51 AM AST Sunrise
Thu -- 07:00 AM AST 0.15 feet Low Tide
Thu -- 01:36 PM AST Moonrise
Thu -- 05:42 PM AST 0.59 feet High Tide
Thu -- 06:40 PM AST 0.44 feet Low Tide
Thu -- 07:03 PM AST Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Playa de Ponce |
Click for Map
Thu -- 01:10 AM AST Moonset
Thu -- 05:52 AM AST Sunrise
Thu -- 11:29 AM AST 0.14 feet Low Tide
Thu -- 01:37 PM AST Moonrise
Thu -- 07:04 PM AST Sunset
Thu -- 09:51 PM AST 0.57 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Weather Map and Satellite Images(on/off)  HelpWeather Map
GOES Local Image of Puerto Rico EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Other links: Northern Pacific Contential US Full GOES-East
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.