Monday, March27, 2017

Marine Weather and Tides
Salinas, PR

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:20AMSunset 6:38PM Monday March 27, 2017 8:26 PM AST (00:26 UTC) Moonrise 6:04AMMoonset 6:24PM Illumination 0% Phase: New Moon; Moon at 0 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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AMZ735 Coastal Waters Of Southern Puerto Rico Out 10 Nm- 325 Pm Ast Mon Mar 27 2017
Tonight..Southeast winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Isolated showers.
Tuesday..South winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Isolated showers.
Tuesday night..Northwest winds 5 to 10 knots veering north after midnight. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers through the night.
Wednesday..North winds 5 to 10 knots veering southeast in the afternoon. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 8 seconds. Isolated showers.
Wednesday night..North winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated showers.
Thursday..Northeast winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers.
Friday..East winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 8 seconds. Scattered showers.
Saturday..East winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 10 seconds. Scattered showers.
AMZ700 325 Pm Ast Mon Mar 27 2017
Synopsis for puerto rico and the uS. Virgin islands waters... Light south to southwest winds are expected through at least Tuesday as a surface low north of hispaniola continues to move northeastward. The northerly swell will continue to subside today. Another northerly swell generated by the surface low is forecast to reach the atlantic waters and passages by the middle of the week.

7 Day Forecast for Marine Location Near Salinas, PR
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location: 17.94, -66.3     debug

Area Discussion for - San Juan, PR
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Fxca62 tjsj 271848
area forecast discussion
national weather service san juan pr
248 pm ast Mon mar 27 2017

A mid-low level trough is forecast to swing by the islands the
rest of today into late Tuesday night. This system will be
accompanied by plenty of tropical moisture through at least mid
week. This will combine with a light southerly wind flow to result
in afternoon convection along and to the north of the cordillera
central, including the san juan metropolitan area and northeast
pr through at least Tuesday. This pattern is expected to change
after Wednesday night, as winds are forecast to become from the
north-northeast with the formation of a trade wind cap over the

Short term Today through Wednesday...

a surface low is about 380 miles north of punta cana and is
moving northeast at about 15 mph. This motion will continue and
perhaps accelerate during the next 48 hours. Bands of convection
will form in the southwest flow around the islands today and
tomorrow, but moisture has diminished somewhat and convection has
been weaker in strength and coverage. There is little consensus in
the models as to where a band might form in the flow tonight, the
gfs wants to have convection form northwest of puerto rico after
28/00z and shift to southeast of puerto rico aft 28/06z. Hires
models have scattered showers on both sides of the island. It is
likely that a band will form parallel to the flow however--and
over water--leaving better than one quarter to one half inch of
rain over smaller islands-- if any are in its path and nearby

On Tuesday a plume of moisture at 700 mb will form an arc that
travels from colombia north to the local caribbean waters from the
west southwest. This plume will enhance the moisture over the area.

Then, during the day Tuesday, with moisture higher and the upper
level jet and trough a little closer conditions will be a little
better even though the GFS is still not putting much divergence
aloft over the forecast area. With strong directional shear near the
surface and good speed shear above 700 mb--albeit decreasing with
time--small showers could develop with land or water spout
potential, once diurnal heating gets underway.

Currently the model trend has been to peak the moisture on Tuesday
but the GFS has been raising its moisture forecast for Wednesday.

Therefore cannot expect too much improvement until Thursday when
drier air will move in from the north. Temperatures on Tuesday will
continue above normal for the north coast despite afternoon
cloudiness, but on Wednesday winds should shift to more northerly as
the low pressure moves east across our longitude and temperatures on
the north coast will return to normal and temperatures on the south
coast will rise by even as much as 5 degrees.

Long term Thursday through Monday... The surface low will
continue to move north into the north central atlantic on Thursday
and the ridge across the western atlantic builds north of the
islands through the end of the week. This will generate a
northerly wind flow from Wednesday through at least Saturday. A
much drier airmass will prevail over the region from Thursday
through late Friday... This will result fair weather conditions
through this period. East to southeast winds return from early
Saturday through Sunday with moisture increasing from the
southeast... Associated with remnants of the surface low/frontal

Shra are forming along a sea breeze front in NRN pr and
will generate very localized brief MVFR conds in cigs/vsbys. Shra
will diminish aft 28/00z. Some areas of hir terrain will be
obscured. Aft 28/06z areas of moisture will move thru the usvi and
leeward islands from the SE to bring brief pds of MVFR in shra to
tisx/tncm/tkpk. Sfc winds se-s 10 to 15 kt. Maximum winds wsw 55
knots btwn fl290-420, but winds will incrs to SW 30 kt as low as
fl120 by 28/06z.

Buoy network continues to indicate subsiding seas across the
local waters. Mariners can expect seas at 2 to 5 feet across the
nearshore waters and up to 6 feet across the atlantic offshore
waters. Models are bringing a short period northerly swell by mid

Preliminary point temps/pops
Sju 75 86 77 85 / 40 40 10 10
stt 75 84 75 84 / 40 40 20 20

Sju watches/warnings/advisories
Pr... None.

Vi... None.

Am... None.

Synopsis... Marine... Cam
short term... Ws
long term... Previous

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
JOXP4 - Jobos Bay Reserve, Puerto Rico 4 mi102 min S 1 80°F 1013 hPa73°F
42085 - Southeast of Ponce, PR 13 mi87 min S 1.9 G 1.9 81°F 82°F2 ft1011.3 hPa (+0.0)
YABP4 - 9754228 - Yabucoa Harbor, PR 26 mi39 min WNW 1 G 1.9
SJNP4 - 9755371 - San Juan, PR 37 mi39 min NNW 1.9 G 2.9
41053 - San Juan, PR 38 mi57 min NNW 5.8 G 7.8 80°F 1011.7 hPa
IMGP4 39 mi27 min SSW 1 G 2.9 80°F
MGIP4 - 9759110 - Magueyes Islands, PR 40 mi39 min SSW 2.9 G 4.1 80°F 83°F1012.4 hPa
AROP4 - 9757809 - Arecibo, PR 43 mi39 min SSE 2.9 G 4.1 79°F
ESPP4 - 9752695 - Esperanza, PR 45 mi39 min SW 5.1 G 7 79°F 82°F1012.5 hPa
FRDP4 - 9753216 - Fajardo, PR 45 mi39 min SSW 1.9 G 2.9 78°F 73°F
VQSP4 - 9752619 - Isabel Segunda, Vieques, PR 48 mi39 min SSW 5.1 G 6 78°F
MGZP4 - 9759394 - Mayaguez, PR 49 mi39 min SSW 6 G 7

Wind History for Penuelas (Punta Guayanilla), PR
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1 day
2 days

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure

Wind History from JPS (wind in knots)
Last 24hrCalm------------------------SW6--------CalmCalm------Calm
1 day agoE10----------------------------------NE5Calm--CalmCalm--
2 days ago------------------------------------SW6Calm--E6E7--

Tide / Current Tables for Playa Cortada, Puerto Rico
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Playa Cortada
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Mon -- 06:04 AM AST     Moonrise
Mon -- 06:24 AM AST     Sunrise
Mon -- 09:01 AM AST     0.68 feet High Tide
Mon -- 10:25 AM AST     0.23 feet Low Tide
Mon -- 06:24 PM AST     Moonset
Mon -- 06:38 PM AST     Sunset
Mon -- 09:10 PM AST     0.78 feet High Tide
Mon -- 10:59 PM AST     New Moon
Mon -- 11:05 PM AST     0.21 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Tide / Current Tables for Las Mareas, Puerto Rico
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Las Mareas
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Mon -- 03:03 AM AST     0.18 feet Low Tide
Mon -- 06:03 AM AST     Moonrise
Mon -- 06:22 AM AST     Sunrise
Mon -- 10:08 AM AST     0.43 feet High Tide
Mon -- 03:50 PM AST     0.23 feet Low Tide
Mon -- 06:23 PM AST     Moonset
Mon -- 06:37 PM AST     Sunset
Mon -- 10:28 PM AST     0.40 feet High Tide
Mon -- 10:59 PM AST     New Moon
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Weather Map and Satellite Images
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Weather Map
IR Satellite Image from GEOS

GOES Local Image of Puerto Rico    EDIT

Wind Forecast for (20,4,5,8)
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Ground Weather Radar Station Puerto Rico,Virgin Islands
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weather_mapweather_map weather_map

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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 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 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.