Marine Weather and Tides
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 5:47AM||Sunset 6:56PM||Monday May 29, 2017 3:48 AM AST (07:48 UTC)||Moonrise 9:43AM||Moonset 10:58PM||Illumination 15%|
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|AMZ735 Coastal Waters Of Southern Puerto Rico Out 10 Nm- 913 Pm Ast Sun May 28 2017 |
Rest of tonight..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers late in the evening, then isolated Thunderstorms after midnight.
Monday..East winds 15 to 20 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Numerous showers and isolated Thunderstorms.
Monday night..East winds 15 to 20 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Scattered showers and isolated Thunderstorms.
Tuesday..East winds 15 to 20 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Scattered showers and isolated Thunderstorms.
Tuesday night..East winds 15 to 20 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers.
Wednesday..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..East winds 15 to 20 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Scattered showers.
Friday..East winds 15 to 20 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Isolated showers.
|AMZ700 913 Pm Ast Sun May 28 2017 |
Synopsis for puerto rico and the uS. Virgin islands waters... Tropical wave expected to enter the u.s. Virgin islands adjacent waters late tonight, then move across the rest of the area Monday through Tuesday. Showers and Thunderstorms will affect the regional waters through this period. Winds and seas higher in the vicinity of Thunderstorms.
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 290151|
area forecast discussion
national weather service san juan pr
951 pm ast Sun may 28 2017
Update An isolated thunderstorm remains over the coastal
waters of northwestern pr close to aguadilla isabela. This
thunderstorm could continue over the atlantic waters for the next
hour or two. Elsewhere, isolated showers were moving over the
eastern and coastal areas of northern pr. However, no significant
rainfall is expected at the moment over these areas. Meanwhile, a
tropical wave interacting with favorable upper levels is expected
to increase shower and thunderstorm activity over the local
waters and islands through the morning hours of Monday and
continue through the day. Periods of urban and small stream
flooding are expected on Monday with the heaviest showers.
Especially across the interior and western sections of pr due to
already saturated soils. No major change from previous
Aviation Tropical wave moving across the eastern caribbean will
result in shra tsra across the local flying area overnight through
Monday. MVFR conds possible through the forecast period across all
terminals. Early on Monday morning across the leeward usvi eastern
pr terminals... Then spreading across all terminals after 29 16z.
Latest tjsj sounding indicated ene winds below fl020 at 8-16
kts... Bcmg ese thru fl100 and W above.
Marine Latest buoy readings across the coastal waters of the
islands were indicating seas between 2-4 feet and east-northeast
winds around 15 kts. As the tropical wave moves across the
caribbean waters, winds will increase up to 20 knots overnight as
well as shower and thunderstorm activity. No change from previous
Prev discussion issued 352 pm ast Sun may 28 2017
synopsis... A mid to upper level long wave trough will continue
to extend from the central atlantic southwest to central caribbean
with diffluence flow aloft over the eastern caribbean. A tropical
wave over the eastern caribbean moving west at around 20 kts.
Satellite images showed scattered showers and thunderstorms
associated with this wave spreading over the northern windward
islands and the leeward islands.
Short term... Tonight through Tuesday night... Will expect leading
edge of tropical wave to start affecting the u.S. Virgin islands
late tonight with showers isolated thunderstorms spreading
gradually westward across eastern pr toward morning. Models are
now indicating the wave moving faster with most active portion|
affecting the local islands during Monday and Monday night. Upper
level divergence diffluence associated with the upper trough
should enhance the shower thunderstorm activity as the two systems
come into phase over the local islands. To that respect, decided
to increase the chances for rain to indicate numerous showers and
isolated thunderstorms Monday with a gradual decrease on Tuesday
as the wave moves west of the area. Although widespread flooding
is not anticipated... These showers thunderstorms could result in
localized flooding in areas where the ground is already saturated
due to recent rains. We will continue to monitor the situation.
Long term... Wednesday through Monday... Although the wave should
be west of our area by Wednesday, abundant moisture should
continue behind the wave. The mid upper level trough should
continue across the eastern caribbean keeping all areas from pr
eastward under rather unstable conditions supporting the
development of showers and thunderstorms across the local area at
least through Saturday. Another tropical wave could approach the
region by Sunday with a further increase in the chance for rain.
Aviation... PrevailingVFR across the terminals except for tempo MVFR conds at
tjmz possible through 28 20z. Winds from the east to ese at about
15kt with sea breeze variations and occasional gusts today. Shra
will increase late tonight due to approaching tropical wave causing
at least vcsh vcts across the local terminals except for tjmz and
tjbq late tonight into Monday morning. Winds remaining from the east
overnight and Monday morning. More persistent shra and tsra across
the general area after 29 16z which will affect the local
Marine... Seas are expected to remain between 2 to 5 feet and
winds of 15 knots or less in most areas through tonight. Winds
and seas could increase Monday and Monday night as the tropical
wave move across our coastal waters. Although a small craft
advisory is not anticipated... Mariners are advice to exercise
caution as winds and seas could be locally higher in the vicinity
Preliminary point temps pops
Sju 77 88 77 86 40 60 50 50
stt 78 86 78 86 50 60 60 60
Sju watches warnings advisories
Short term... Ds
long term... .Rgh
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||64 min||NNE 1||78°F||1017 hPa||73°F|
|42085 - Southeast of Ponce, PR||13 mi||49 min||ENE 9.7 G 12||83°F||83°F||1015.5 hPa (-1.1)|
|YABP4 - 9754228 - Yabucoa Harbor, PR||26 mi||49 min||NNW 1 G 1.9|
|SJNP4 - 9755371 - San Juan, PR||37 mi||49 min||ENE 9.9 G 13||80°F||83°F||1017.2 hPa (-1.0)|
|41053 - San Juan, PR||38 mi||49 min||E 14 G 18||80°F||82°F||3 ft||1016.5 hPa (-1.0)|
|IMGP4||39 mi||34 min||NE 2.9 G 5.1||76°F|
|MGIP4 - 9759110 - Magueyes Islands, PR||40 mi||49 min||NE 2.9 G 7||76°F||84°F||1016.3 hPa (-1.4)|
|AROP4 - 9757809 - Arecibo, PR||43 mi||49 min||SSE 2.9 G 5.1||74°F|
|ESPP4 - 9752695 - Esperanza, PR||45 mi||49 min||ENE 4.1 G 7||78°F||83°F||1016.5 hPa (-1.1)|
|FRDP4 - 9753216 - Fajardo, PR||45 mi||49 min||ENE 11 G 12||81°F||75°F|
|VQSP4 - 9752619 - Isabel Segunda, Vieques, PR||48 mi||49 min||ESE 2.9 G 6||78°F|
|MGZP4 - 9759394 - Mayaguez, PR||49 mi||49 min||SE 2.9 G 4.1||75°F||86°F||1016.4 hPa (-1.4)|
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||N 0||10.00 mi||Clear||75°F||71°F||89%||1017.6 hPa|
Wind History from JPS (wind in knots)
|1 day ago||NE||Calm|
|2 days ago||Calm||Calm||NE||NE||Calm||Calm|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Playa Cortada |
Click for Map
Mon -- 01:41 AM AST 0.94 feet High Tide
Mon -- 04:13 AM AST 0.71 feet Low Tide
Mon -- 05:49 AM AST Sunrise
Mon -- 09:24 AM AST 0.71 feet High Tide
Mon -- 09:43 AM AST Moonrise
Mon -- 02:02 PM AST -0.13 feet Low Tide
Mon -- 06:56 PM AST Sunset
Mon -- 10:58 PM AST Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
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|Las Mareas |
Click for Map
Mon -- 01:54 AM AST 0.80 feet High Tide
Mon -- 05:48 AM AST Sunrise
Mon -- 09:42 AM AST Moonrise
Mon -- 01:03 PM AST -0.14 feet Low Tide
Mon -- 06:55 PM AST Sunset
Mon -- 10:57 PM AST Moonset
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 (3,6,7,8)(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.