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 7:03PM||Tuesday June 19, 2018 1:56 PM AST (17:56 UTC)||Moonrise 11:45AM||Moonset 12:00AM||Illumination 38%|
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|AMZ712 Coastal Waters Of Northern Puerto Rico Out 10 Nm- 952 Am Ast Tue Jun 19 2018 |
Rest of today..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Scattered showers through the day. Isolated Thunderstorms in the afternoon.
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.
Wednesday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Scattered showers through the day. Isolated Thunderstorms in the afternoon.
Wednesday night..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 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated showers.
Friday..Southeast 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.
Saturday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated Thunderstorms. Scattered showers.
|AMZ700 952 Am Ast Tue Jun 19 2018 |
Synopsis for puerto rico and the uS. Virgin islands waters... Surface high pressure located across the northeastern atlantic will promote light to moderate southeasterly winds over the next several days. A tropical wave will continue to approach the islands today. Due to the increase in moisture showers and isolated Thunderstorms are expected across most of the regional waters the rest of today into Wednesday.
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 191435|
area forecast discussion
national weather service san juan pr
1035 am ast Tue jun 19 2018
An approaching wave will create unsettle weather conditions
across the islands today. Showers are expected to continue across
the u.S. Virgin islands and eastern pr. Although the interior,
north central and western sections of puerto rico have sunny
skies, showers and thunderstorms are expected to develop later
this morning into the afternoon hours. The potential for shower
and thunderstorm activity is forecast to persist through at least
Wednesday, as the moisture of the tropical wave linger across the
islands. No changes were introduce to the inherited forecast
Shra tsra are expected to affect most of the local terminal
as a tropical wave approach the region. MVFR or even ifr periods
are expected from time to time at tjsj tjbq tjmz tjps btwn
19 16-23z. Tempo groups are in place for most of the local taf
sites. Shra and tsra are expected to slowly dissipate by late
Wednesday afternoon. Winds are expected to continue from the ese-
se at 10 to 15 knots with sea breeze variations. Higher gusts are
expected in near shra tsra.
A tropical wave will moved south of the islands, but the tropical
moisture associated to it will increase showers and thunderstorms
across the region today and Wednesday. Mariners can expect seas
at 3 to 5 feet with an east-southeast wind flow between 10 and 15
knots. However, locally higher seas and winds near showers and
thunderstorms are expected through this period.
Prev discussion issued 508 am ast Tue jun 19 2018
synopsis... Surface high pressure maintains its hold over the
region promoting fresh to moderate winds. A tutt low to the north
of puerto rico and tropical waves today and Friday will cause
scattered showers and isolated thunderstorms through Sunday. Above
normal temperatures will return to normal due to the increase in
shower activity. Sunday the tutt low moves away from the area and
drier air will work in from the east causing a brief period of
Short term... Today through Thursday...
a ridge extends southwest out of the surface high in the central
atlantic into the northeastern caribbean. An upper level trough
across hispaniola will drift into cuba by tomorrow morning forced by
high pressure that will nose into the eastern caribbean. The best
upper level dynamics, however, will be Tuesday and Wednesday
afternoons as a weak jet streak crosses through and a tutt moves
toward the local islands. This should also enhance the amount of
lightning seen with the thunderstorms.
Moisture associated with a tropical wave is now entering puerto rico
and the u.S. Virgin islands. Strong convection has not moved with
the wave as readily and is still located southwest of guadeloupe. A
second lobe of this moisture is over the windward islands and will
arrive on Wednesday. Currently drying is depicted just as the best
divergence of the week takes hold over puerto rico and the u.S.
Virgin islands on Thursday, and the GFS has columnar moisture
peaking late tonight with a secondary maximum during the afternoon
All of this means that showers and thunderstorms will re-develop
today--mainly over the northwestern third of puerto rico during the
afternoon. Urban and small stream flooding that was very localized
yesterday will increase somewhat today. The flow of moisture will
continue overnight to extend the shower activity a little later than|
normal tonight. Some high cloudiness may slow convection on
Wednesday, but some divergence aloft will be present and showers and
thunderstorms will undergo a typical diurnal cycle. This will bring
another round of urban and small stream flooding over a somewhat
larger area. Although moisture diminishes on Thursday, the threat of
urban and small stream flooding may continue--especially in the
northwest and north central portions of the island until low-
level dry air can invade.
Long term... Friday through Wednesday...
the surface ridge will maintain its hold over the region with
moderate to fresh easterly winds of 10 to 15 mph through the
period. A cut-off low to the north of puerto rico will continue to
move south until it reaches the northern portions of puerto rico
during the afternoon on Friday. At the same time a tropical wave
moves across the lesser antilles Friday morning, then affect the
u.S. Virgin islands during the afternoon, before arrive to puerto
rico later in the day. Due to the proximity of the upper level low
which will provide upper-level forcing, and the increase in low
level moisture due the approaching tropical wave; instability is
expected to increase over the area. Therefore, numerous to
scattered showers with isolated thunderstorms are expected through
the long-term period during the afternoon hours. Recent analysis
of the gdi shows values ranging from 35 to 40 which means theirs
potential for scattered thunderstorms with some having the
capability of producing heavy rain. The best upper level
divergence will be Saturday afternoon, as a result isolated
thunderstorms were put into the grids.
Sunday, the region will transition from a moist air mass to a
drier one as the tropical wave push east of the region as drier
air works in behind the the wave. The beginning of next week fair
weather returns with diurnal and locally induced showers during
the afternoon--mainly over the western portions of puerto rico.
Aviation...VFR conds prevail. Moisture from a tropical wave
movg toward pr is sprdg sct -shra across the local waters and the
eastern end of pr. Aft 19 15z shra tsra will begin to dvlp ovr
western and interior pr with shra arnd the usvi. Periods of MVFR
conds due to CIGS are expected with some MVFR vsbys. Sfc winds E 12-
18 kt with sea breeze influences aft 18 14z bcmg SE aft 19 18z. Max
winds SW 40-50 kt btwn fl330-480.
Marine... Seas of 2 to 5 feet and east southeast winds of 10 to 15
kts will continue across the regional waters through Thursday.
Today showers and thunderstorms are expected across the regional
and local waterways has a tropical wave moves over the area. A low
to moderate rip currents risk is expected for the remainder of the
Fire weather... The moisture moving into the area and the rainfall
expected should bring the fire danger back to low today and
tonight. Enough moisture is expected to keep conditions low
through the end of the week.
Preliminary point temps pops
Sju 77 91 78 89 30 50 40 10
stt 80 87 80 89 50 30 20 10
Sju watches warnings advisories
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||56 min||E 18 G 21||82°F||82°F||3 ft||1015.5 hPa (-1.2)|
|SJNP4 - 9755371 - San Juan, PR||16 mi||44 min||83°F||84°F||1016.3 hPa|
|YABP4 - 9754228 - Yabucoa Harbor, PR||16 mi||38 min||87°F|
|41056||25 mi||56 min||83°F|
|JOXP4 - Jobos Bay Reserve, Puerto Rico||27 mi||71 min||E 8||87°F||1017 hPa||76°F|
|CLBP4 - 9752235 - Culebra, PR||33 mi||38 min||88°F||85°F||1016.6 hPa|
|AROP4 - 9757809 - Arecibo, PR||43 mi||38 min||ENE 13 G 21|
|42085 - Southeast of Ponce, PR||43 mi||56 min||E 14 G 18||84°F||83°F||1015.5 hPa (-0.8)|
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||2 hrs||ENE 11||10.00 mi||Light Rain||79°F||75°F||88%||1016.9 hPa|
Wind History from JSJ (wind in knots)
|1 day ago||S||SE||S||S||S||S||S||Calm||E||Calm||E||Calm||Calm||S||Calm||Calm||Calm||E||W||E||NE||E|
|2 days ago||E||NE||NE||E||E||E||E||E||E||E||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||E||N||Calm|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Boca De Cangrejos |
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Tue -- 01:44 AM AST 1.42 feet High Tide
Tue -- 05:48 AM AST Sunrise
Tue -- 08:24 AM AST 0.24 feet Low Tide
Tue -- 11:44 AM AST Moonrise
Tue -- 02:05 PM AST 0.94 feet High Tide
Tue -- 07:02 PM AST Sunset
Tue -- 07:55 PM AST 0.20 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
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|Vieques Passage |
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Tue -- 12:12 AM AST 0.00 knots Slack
Tue -- 03:16 AM AST 0.66 knots Max Flood
Tue -- 05:47 AM AST Sunrise
Tue -- 06:10 AM AST -0.00 knots Slack
Tue -- 09:40 AM AST -0.90 knots Max Ebb
Tue -- 11:43 AM AST Moonrise
Tue -- 01:05 PM AST 0.00 knots Slack
Tue -- 04:11 PM AST 0.76 knots Max Flood
Tue -- 07:00 PM AST Sunset
Tue -- 07:28 PM AST -0.00 knots Slack
Tue -- 10:23 PM AST -0.62 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Weather Map and Satellite Images(on/off)  HelpWeather Map
GOES Local Image of 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.