Marine Weather and Tides
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.
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.
|Sunrise 6:09AM||Sunset 6:54PM||Monday April 23, 2018 10:53 PM AST (02:53 UTC)||Moonrise 1:10PM||Moonset 1:33AM||Illumination 63%|
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|AMZ742 Coastal Waters Of Northwestern Puerto Rico Out 10 Nm- 927 Pm Ast Mon Apr 23 2018 |
Rest of tonight..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Scattered showers.
Tuesday..Northeast 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 afternoon.
Tuesday night..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Scattered showers.
Wednesday..Northeast winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Scattered showers through the day. Isolated Thunderstorms in the afternoon.
Wednesday night..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Isolated showers.
Thursday..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Isolated Thunderstorms, then scattered showers.
Friday..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated Thunderstorms. Scattered showers.
Saturday..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 11 seconds. Isolated Thunderstorms. Scattered showers.
|AMZ700 927 Pm Ast Mon Apr 23 2018 |
Synopsis for puerto rico and the uS. Virgin islands waters... Winds and seas will continue hazardous across portions of the offshore atlantic waters through late tonight as a surface high pressure spreads across the western atlantic. Showers and Thunderstorms are expected to develop across portions of the regional waters through at least Tuesday, as an upper trough moves over the local region and interacts with the available moisture transported by the moderate to fresh easterly winds.
7 Day Forecast for Marine Location Near Rinc�n, PRHourly EDIT Help
Area Discussion for - San Juan, PR  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxca62 tjsj 240205|
area forecast discussion
national weather service san juan pr
1005 pm ast Mon apr 23 2018
Update Latest sounding at 24 00z showed a surprisingly moist
environment. Precipitable water came in at 1.90 inches. Showers
have dissipated from puerto rico and only a few light showers are
left over the local waters. Flow was east southeast at lower
levels. Although an area of upper level divergence will move into
our local atlantic waters from the dominican republic, it is
expected that little effect will be seen. Models show drier air at
850 mb encroaching on the area after 24 09z and most showers
should end between 24 12-18z east of puerto rico. Still expecting
local showers and thunderstorms in western and interior puerto
rico Tuesday afternoon but since the upper level trough will have
already passed through all activity should be much weaker than
Updated a few temperatures and local winds, but
changes were minor.
Aviation Vfr conds are expected to continue thru 24 16z. Aft
24 16z local shra in WRN and interior pr could provoke MVFR conds
and mtn obscurations due to shra tsra, but brief at TAF sites.
Winds ese 6 to 12 kt with land breezes, bcmg 10 to 20 kt aft
24 14z with sea breezes. MAX winds wsw 75-85 kt btwn fl360-410
diminishing to 55-65 kt by 24 12z.
Marine Seas are continuing to subside. This trend is expected
to continue through Thursday as winds also relax. Small craft
advisories are not expected to be needed in the next 7 days. Also
the high risk of rip currents for saint croix will be taken down
at 6 am ast.
Prev discussion issued 447 pm ast Mon apr 23 2018
a short wave trough aloft interacting with plenty of tropical
moisture will continue to bring periods of showers and
thunderstorms across the islands through late tonight. An upper
ridge is forecast to builds over the region by Wednesday.
Short term... Tonight through Wednesday...
considerable cloudiness continued across the region today as a mid
to upper trough became amplified just west of the area and will lift
east northeast across the region. Although this cloudiness
delayed afternoon convection, showers and thunderstorms developed
across the san juan metro area producing urban flooding. Although
the strongest activity dissipated, additional showers will remain
possible from time to time through the overnight hours. Another
thunderstorms were detected across the interior and western
sections which produce periods of gusty winds, frequent lightning
and torrential rainfall. This activity is expected to drift
northward til its dissipate later tonight.
In general the proximity of the mid to upper level short wave
trough combined with moisture advection and local effects will
support afternoon convection on Tuesday especially across over
the northern half and west to northwest sections of the island
including parts of the san juan metro area as well as downwind
from the virgin isles.
Although the moisture is expected to diminish by Wednesday as a
mid to upper level ridge builds aloft, early morning and|
afternoon convection will be possible due to the lingering
moisture along with local and diurnal effects. This activity
should be focused over the northern half and west to northwest
sections of the island including parts of the san juan metro area.
Long term... Thursday through next Tuesday...
upper levels will be dominated by a ridge which may hold steady
for several days during the long range forecast. The local winds
will be mainly from the ese to E during the same time period,
mainly ranging between 5 and 15mph with occasional areas of up to
20mph over the local waters. The main variation in pattern appears
to be the fluctuations in available moisture. Some days will be a
bit drier than others and therefore the coverage of shower and
thunderstorm activity would be expected to be lower but these
moments of lower moisture may be short lived and for the most part
near normal available moisture is expected with precipitable
water values hovering between 1.4 and 1.6 inches. This means that
for the most part only locally induced showers and thunderstorms
are to be expected in the long range if the models were to verify
the overall pattern. This means that isolated to scattered showers
across the local waters, usvi, and eastern pr are expected in the
overnight and early morning hours, while afternoon convection
would be expected across central and western pr due to the local
effects. Some showers may stream off the luquillo mountain range
and affect portions of the san juan metro as well.
vfr conds at local terminals durg prd. However... Til
23 22z... Expect isold to scattered shra ovr and around the islands
and most terminals with isold tsra fcst in the vcty of
tjsj tjmz tjbq. Tempo MVFR and brief ifr cond can therefore be
expected. Except for local sea breeze variation, winds will be
mainly fm e-se at 15 to 20 kts with occasionally higher gusts along
the coastal areas and vcty shra tsra. Wnds bcmg 10kts of less aft
23 23z. MAX winds wsw 85-95 kt btwn fl350-440 diminishing to 55-65
kt by 24 06z.
winds will continue at 15 to 20 mph across local waters and
passages. Choppy seas at 5 to 7 feet will continue across the
atlantic offshore waters, therefore a small craft advisory still
in effect until early Tuesday morning. Elsewhere mariners should
exercise caution due to seas up to 6 feet and winds around 18
knots. Seas and winds are forecast to slowly diminish across the
local waters after Tuesday. Isolated thunderstorms will remain
possible over parts of the near shore coastal waters until later
Preliminary point temps pops
Sju 74 86 75 88 40 40 20 20
stt 75 86 75 87 30 20 20 40
Sju watches warnings advisories
Vi... High rip current risk until 6 am ast Tuesday for st croix.
Am... Small craft advisory until 2 am ast Tuesday for atlantic waters
of puerto rico and usvi from 10 nm to 19.5n.
Short term... Cam
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|
|MISP4 - 9759938 - Mona Island, PR||70 mi||54 min||76°F||81°F||1016.3 hPa (+0.8)|
Wind History for Mayaguez, PR(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Aquadilla, Rafael Hernandez Airport, PR||78 mi||2.1 hrs||ESE 5||10.00 mi||Mostly Cloudy||75°F||69°F||83%||1017.3 hPa|
Wind History from JBQ (wind in knots)
|1 day ago||E||E||E|
|2 days ago||E||E||SE||E||E||E||E|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Mona Island |
Click for Map
Mon -- 01:28 AM AST Moonset
Mon -- 03:16 AM AST 0.81 feet High Tide
Mon -- 05:26 AM AST 0.77 feet Low Tide
Mon -- 06:09 AM AST Sunrise
Mon -- 07:15 AM AST 0.80 feet High Tide
Mon -- 01:09 PM AST Moonrise
Mon -- 01:14 PM AST 0.23 feet Low Tide
Mon -- 01:53 PM AST 0.23 feet High Tide
Mon -- 05:37 PM AST 0.04 feet Low Tide
Mon -- 06:50 PM AST Sunset
Mon -- 09:19 PM AST 0.25 feet High Tide
Mon -- 10:19 PM AST 0.25 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
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Click for Map
Mon -- 01:26 AM AST Moonset
Mon -- 02:20 AM AST 1.46 feet High Tide
Mon -- 06:06 AM AST Sunrise
Mon -- 09:04 AM AST 0.18 feet Low Tide
Mon -- 01:05 PM AST Moonrise
Mon -- 02:30 PM AST 0.89 feet High Tide
Mon -- 06:47 PM AST Sunset
Mon -- 08:44 PM AST 0.02 feet Low 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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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.