Tuesday, January23, 2018 L-36.com

Marine Weather and Tides
Rinc�n, PR

Version 3.4
What's New / NOTES
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.
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 7:07AMSunset 6:23PM Tuesday January 23, 2018 3:47 AM AST (07:47 UTC) Moonrise 11:32AMMoonset 12:00AM Illumination 40% Phase: Waxing Crescent; Moon at 6 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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AMZ742 Coastal Waters Of Northwestern Puerto Rico Out 10 Nm- 859 Pm Ast Mon Jan 22 2018
.small craft should exercise caution...
Rest of tonight..East winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 10 seconds. Isolated showers through the night.
Tuesday..Northeast winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 8 seconds.
Tuesday night..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 8 seconds. Isolated showers through the night.
Wednesday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 8 seconds. Scattered showers.
Wednesday night..East 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 15 to 20 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Scattered showers.
Friday..Northeast winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 12 seconds. Northeast swell 4 to 7 feet. Isolated showers.
Saturday..East winds 15 to 20 knots. Seas 5 to 7 feet with occasional seas up to 9 feet. Dominant period 12 seconds. North swell 4 to 8 feet. Isolated showers.
AMZ700 859 Pm Ast Mon Jan 22 2018
Synopsis for puerto rico and the uS. Virgin islands waters... Surface high pressure across the west and central atlantic will maintain moderate to locally fresh trade winds through Tuesday. A long period northerly swell will continue to affect the atlantic waters and local passages tonight but will slowly subside through Tuesday.

7 Day Forecast for Marine Location Near Rinc�n, PR
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location: 19.03, -68.44     debug

Area Discussion for - San Juan, PR
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Fxca62 tjsj 230146
area forecast discussion
national weather service san juan pr
946 pm ast Mon jan 22 2018

Update Fair weather conditions prevailed during the late
afternoon evening hours across the region. The 00z tjsj sounding
indicated just 1.21 inches of pwat as drier air filtered across
the area. However, a band of showers currently affecting the
leeward islands is moving toward the usvi and will result mainly
in quick passing showers with brief gusty winds at times through
Tuesday morning. This surge of low level moisture will aid in the
development of diurnally induced showers over the islands and
mainly across the western portions of pr on Tuesday afternoon.

Overnight temperatures could reach the mid to high 50s across the
higher elevations. Winds will continue from the east between 5-15

Aviation update MainlyVFR conds to prevail across all
terminals. However, -shra on trades moving across the leeward
islands could move briefly across the usvi terminals during the
overnight into Tuesday morning. Latest 23 00z tjsj upper air
sounding indicated ene winds at 11-24 kt from sfc to fl100.

Marine update The northerly swell is subsiding and the regional
seas no longer meet small craft advisory criteria, therefore sca
were dropped earlier tonight. However, small crafts should
continue to exercise caution across both atlantic and caribbean
waters and passages due to seas up to 6 feet and or winds up to
20 kt. High rip current risk will continue on Tuesday mainly for
the northwestern coast of puerto rico. Moderate risk continues
across the rest of the coastal areas of the islands.

Prev discussion issued 341 pm ast Mon jan 22 2018
synopsis... A surface high pressure across the north atlantic is
moving east and will strengthen over the course of the next few
days as it absorbs another surface high across the northeastern
atlantic. Another surface high pressure will move into the
western atlantic, north of the local area late this week. This
will keep mainly easterly winds across the local area for the next
few days, becoming east northeasterly and rather breezy towards
the end of the week. Upper ridge will continue over the local
islands for the next several days with an upper trough passing to
the north of the local area, digging a bit more to the east of
the leeward islands early next week. Frontal boundary is expected
to remain well north of the local islands early next week.

Short term... Tonight through Wednesday...

easterly trade winds continue as high pressure retreats and is
absorbed into another high in the northwest atlantic. The next
vigorous cold front is poised to move into the western atlantic
Tuesday evening. Its best progress during the week will be made to
the east, so by Thursday it will still be a little over 400 miles
to our north northwest. At first we will see a continuation of
patches of low level moisture that will move through with
scattered showers and a slightly deeper low level moist layer, but
on Thursday flow will begin to turn northeast to bring in cooler
and slightly drier air from the central atlantic. This will
diminish the showers over most of puerto rico, but may leave
scattered showers and cooler weather on the northeast coast.

At upper levels a weak trough is passing through the area and will
coincide with the back edge of the better moisture seen today--
though mainly in the atlantic waters north of the islands. The
moisture returns Tuesday and Wednesday in spite of the ridge that
builds--albeit weakly. A second weaker trough will move through
Wednesday night and drier air will again move in from the northeast.

Mid levels remain quite dry.

Long term... Thursday through Tuesday of next week...

from previous discussion...

the upper level high pressure ridge will hold across the region through
Friday. However the prevailing easterlies will continue to transport
sufficient moisture across the region to support periods of passing
late evening and early morning showers, as well as isolated to scattered
afternoon convection. Saturday through Sunday, a polar trough will amplify
and spread eastward across the west and central atlantic causing a slight
erosion of the upper level ridge. By Monday and Tuesday the mid to upper
level ridge will reestablish over the region and again limit shower

In the meantime, the a cold front is forecast to move across the west
atlantic and reach the local area by the upcoming weekend. Model guidance
continued to suggest a gradual increase in trade winds moisture during
the latter part of the week with more favorable conditions for moisture
convergence and shower development over the weekend, as the cold front
sinks southwards and stalls just north of the region by Sunday. Improving
weather conditions are however expected by Monday and Tuesday with a
return of more typical passing trade wind showers.

Aviation...VFR conditions are expected at all TAF stations. Shra in
wrn pr may produce brief MVFR conds til 22 21z and mtn obscurations.

Winds east 8 to 16 kt with sea breeze influences til 22 21z then
subsiding to less than 12 kt. Shra will increase from east to west
arriving in ERN pr arnd 23 09z. Sea breezes return aft 23 14z east 8
to 16 kt. MAX winds west 35-40 kt fl420-500 diminishing aft
23 00z.

Marine... Seas remain hazardous and are expected to remain
hazardous through Tuesday. Wave heights will be up to 7 feet
today, mainly for the atlantic waters and local passages,
elsewhere, seas will be up to 6 feet. There is a high risk of rip
currents for the north facing beaches of puerto rico, moderate
risk for most of the remaining coastlines of pr and the usvi. A
strong northerly swell could invade the local waters this coming

Preliminary point temps pops
Sju 74 84 75 84 30 30 50 50
stt 75 84 74 84 30 30 40 40

Sju watches warnings advisories
Pr... High rip current risk until 6 am ast Tuesday for north central-
northeast-san juan and vicinity-southeast.

High rip current risk through Tuesday afternoon for northwest-
western interior.

Vi... None.

Am... None.

Short term... Ds
long term... .Ja

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MISP4 - 9759938 - Mona Island, PR 70 mi48 min 74°F 80°F1014.5 hPa (-1.7)

Wind History for Mayaguez, PR
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1 day
2 days

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure

Wind History from JBQ (wind in knots)
Last 24hr------------------E5E5E6E8E12E13
1 day ago--------------------------E11E14E16E15E17E16E13E7E10
2 days agoSE5SE6E6E5--E5------E7SE7E8E13

Tide / Current Tables for Mona Island, Puerto Rico
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Mona Island
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Tue -- 12:48 AM AST     0.33 feet High Tide
Tue -- 03:46 AM AST     0.25 feet Low Tide
Tue -- 07:06 AM AST     Sunrise
Tue -- 07:46 AM AST     0.51 feet High Tide
Tue -- 08:34 AM AST     0.51 feet Low Tide
Tue -- 11:29 AM AST     Moonrise
Tue -- 12:48 PM AST     0.63 feet High Tide
Tue -- 05:24 PM AST     0.29 feet Low Tide
Tue -- 06:21 PM AST     Sunset
Tue -- 07:01 PM AST     0.33 feet High Tide
Tue -- 09:55 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 Aguadilla, Crashboat Beach, Puerto Rico
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Tue -- 12:23 AM AST     1.07 feet High Tide
Tue -- 06:37 AM AST     0.19 feet Low Tide
Tue -- 07:03 AM AST     Sunrise
Tue -- 11:26 AM AST     Moonrise
Tue -- 12:36 PM AST     1.21 feet High Tide
Tue -- 06:17 PM AST     Sunset
Tue -- 07:17 PM AST     0.05 feet Low Tide
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 (2,6,7,8)
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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 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.