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 5:47AM||Sunset 7:04PM||Thursday June 21, 2018 4:16 AM AST (08:16 UTC)||Moonrise 1:35PM||Moonset 1:08AM||Illumination 55%|
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|AMZ712 Coastal Waters Of Northern Puerto Rico Out 10 Nm- 929 Pm Ast Wed Jun 20 2018 |
Rest of tonight..Southeast winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Isolated Thunderstorms in the evening. Scattered showers through the night.
Thursday..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated showers.
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 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Scattered showers through the day. Isolated Thunderstorms in the afternoon.
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 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated Thunderstorms.
Sunday..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated Thunderstorms. Scattered showers.
Monday..East winds 10 to 15 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 8 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 Lomas, PRHourly EDIT Help
Area Discussion for - San Juan, PR  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxca62 tjsj 210809|
area forecast discussion
national weather service san juan pr
409 am ast Thu jun 21 2018
Synopsis High pressure at the surface will move into the
western atlantic by the weekend and will dominate the weather
pattern through mid week next week. A tropical wave on Friday will
bring more showers and thunderstorms for the weekend. A wind
surge late Sunday will bring drying that will continue until the
following Thursday morning.
Short term Today through Saturday...
mostly clear skies prevailed across the forecast area early this
morning with some showers noted across the local waters but none
over land areas. Temperatures were in the mid to upper 70s under
light and variable winds.
A tutt low will continue to meander west northwest of the
forecast area through the forecast period. At lower levels,
although limited moisture is expected throughout the day,
precipitable water will increase once again on Friday as a
tropical wave now located near 58w reaches the forecast area.
Winds are expected to become more east southeast by the upcoming
weekend as the surface high located across the north central
atlantic shifts southwestward into the central atlantic.
Therefore, a fair weather pattern will continue to prevail
throughout today with shower and thunderstorm development focused
across the northwest quadrant of puerto rico in the afternoon.
Hazy skies and warm to hot temperatures are likely. As the
tropical wave moves closer to the forecast area, passing showers
will be affecting usvi and the eastern third of puerto rico Friday
morning spreading across northwest puerto rico in the afternoon.
The chance for showers and thunderstorms continues on Saturday due
to lingering moisture.
Long term Sunday through Thursday...
moisture from the passage of a tropical wave will continue at|
lower levels through Sunday. A wind surge will bring somewhat
drier air for the first several days of the new work week. A cut-
off low just north of puerto rico on Saturday will move northwest
and a ridge will build in its place. The same low will return to
just north of punta cana in the dominican republic by Thursday. A
tutt low just under 1000 miles east northeast of san juan will
edge several hundred miles closer early next week.
The beginning of the period will see showers in the typical
diurnal pattern and thunderstorms will continue during the
afternoon hours--first in the northwest on Saturday, then forming
a little farther south in western puerto rico on Sunday. Showers
and thunderstorms will continue after Sunday but there will be
noticeably less shower activity Monday and Tuesday. Moisture does
not increase until Thursday afternoon for puerto rico.
Scattered showers will pass by the u.S. Virgin islands Saturday
and Sunday, but from Monday on, showers will become fewer.
Aviation Vfr conds are expected to prevail at all TAF sites with
tsra shra possible in and around jmz jbq aft 16z. Ese winds 10 knots
or less with some sea breeze variations.
Marine Winds increase slowly through Sunday and seas rise
accordingly. Small craft advisories are possible as early as
Sunday morning, but likely by early Monday across the anegada
passage and most of the caribbean waters. Showers and scattered
thunderstorms will return Friday through Sunday.
Preliminary point temps pops
Sju 90 78 89 77 20 20 20 50
stt 88 79 88 78 20 20 50 70
Sju watches warnings advisories
Short term... Om
long term... .Ws
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||47 min||SE 9.7 G 12||80°F||1014.7 hPa|
|SJNP4 - 9755371 - San Juan, PR||16 mi||47 min||79°F||83°F||1015.6 hPa|
|YABP4 - 9754228 - Yabucoa Harbor, PR||16 mi||47 min||76°F|
|41056||25 mi||47 min||SSE 7.8 G 9.7||81°F||1015 hPa|
|JOXP4 - Jobos Bay Reserve, Puerto Rico||27 mi||92 min||NNW 1.9||76°F||1016 hPa||72°F|
|CLBP4 - 9752235 - Culebra, PR||33 mi||47 min||78°F||83°F||1015.8 hPa|
|AROP4 - 9757809 - Arecibo, PR||43 mi||47 min||S 2.9 G 4.1|
|42085 - Southeast of Ponce, PR||43 mi||77 min||ESE 12 G 14||85°F||83°F||1015 hPa (-2.1)|
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||21 min||SE 4||10.00 mi||Fair||79°F||73°F||85%||1015.4 hPa|
Wind History from JSJ (wind in knots)
|1 day ago||Calm||Calm||Calm||Calm||SE||E||NE||E||E|
|2 days ago||Calm||Calm||Calm||E||W||E||NE||E||E|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Boca De Cangrejos |
Click for Map
Thu -- 01:08 AM AST Moonset
Thu -- 03:23 AM AST 1.18 feet High Tide
Thu -- 05:48 AM AST Sunrise
Thu -- 10:02 AM AST 0.10 feet Low Tide
Thu -- 01:34 PM AST Moonrise
Thu -- 04:38 PM AST 1.12 feet High Tide
Thu -- 07:02 PM AST Sunset
Thu -- 10:32 PM AST 0.43 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Vieques Passage |
Click for Map
Thu -- 01:06 AM AST Moonset
Thu -- 02:44 AM AST 0.00 knots Slack
Thu -- 05:24 AM AST 0.47 knots Max Flood
Thu -- 05:47 AM AST Sunrise
Thu -- 08:03 AM AST -0.00 knots Slack
Thu -- 11:26 AM AST -0.70 knots Max Ebb
Thu -- 01:32 PM AST Moonrise
Thu -- 02:35 PM AST 0.00 knots Slack
Thu -- 05:57 PM AST 0.80 knots Max Flood
Thu -- 07:00 PM AST Sunset
Thu -- 09:21 PM AST -0.00 knots Slack
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.
target = "new">Link to Loop
Other links: Northern Pacific Contential US Full GOES-East
Wind Forecast for (4,6,7,8)(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.