Thursday, March30, 2017 L-36.com


Marine Weather and Tides
Gu�nica, 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 6:21AMSunset 6:41PM Thursday March 30, 2017 12:37 PM AST (16:37 UTC) Moonrise 8:28AMMoonset 9:29PM Illumination 11% Phase: Waxing Crescent; Moon at 3 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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AMZ745 Coastal Waters Of Southwestern Puerto Rico Out 10 Nm- 1209 Pm Ast Thu Mar 30 2017
Rest of today..North winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 8 seconds.
Tonight..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 12 seconds.
Friday..East winds 5 to 10 knots veering west in the afternoon. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 12 seconds.
Friday night..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 11 seconds. Isolated showers.
Saturday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 12 seconds. Northwest swell around 4 feet. Isolated showers.
Sunday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 12 seconds. North swell 4 to 5 feet. Isolated showers.
Monday..East winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 11 seconds. Isolated showers.
AMZ700 1209 Pm Ast Thu Mar 30 2017
Synopsis for puerto rico and the uS. Virgin islands waters... Bermuda high pressure will continue to establish north of the area. The surface low which affected the islands during the previous days will be absorbed by another surface low, near nova scotia. This new system will result in a long period northerly swell which is forecast to spread across the atlantic waters by the upcoming weekend.

7 Day Forecast for Marine Location Near Gunica, PR
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location: 17.97, -66.92     debug


Area Discussion for - San Juan, PR
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Fxca62 tjsj 300812
afdsju
area forecast discussion
national weather service san juan pr
412 am ast Thu mar 30 2017

Synopsis The proximity of an area of moisture associated with a
surface low well northeast of the region is expected to combine with
daytime heating and local effects to induce the development of
shower activity along and south of cordillera central this
afternoon. A generally fair weather pattern will prevail on tonight
Friday with some locally induced afternoon showers across west and
southwest puerto rico. Moisture advection is expected to increase
again during the upcoming weekend.

Short term Today through Saturday...

partly cloudy to clear skies prevailed across the local islands
overnight. Some light passing showers were seen across the atlantic
coastal waters.Some of these showers brushed the northern coast of
puerto rico. Rainfall accumulation with this activity was minimal.

For today, high pressure system will take control of the weather
conditions across the region. Drier air will continue to move across
the region from the north, limiting the development of showers
across the area. However, available moisture will combine once again
with daytime heating and local effect, will produce some showers
across the interior and southwest sections of puerto rico this
afternoon.

For late Friday into Saturday, an area of moisture is expected to
move from the caribbean coastal waters to the north and is forecast
to affect the region Friday night into Saturday. Therefore, an
increase in shower activity is expected by that time.

Long term Sunday through Thursday...

a surface high pressure across the central atlantic is expected to
maintain a generally easterly trade wind flow across the region
through late in the weekend. This surface high is expected to drift
rapidly eastward while weakening as a strong surface low and
associated frontal boundary emerge across the eastern united states
seaboard early in the week. This feature is expected to maintain an
east to east northeast low level wind flow across the northeast
caribbean through at least Tuesday. Another surface high will
develop across the central atlantic by mid week between two low
pressure systems. One of the low across the north central atlantic
and the other emerging across the northwestern atlantic. The
combination of these features will induce a tight pressure gradient
over the region increasing the winds speed across the local islands
Wednesday and Thursday. Patches of moisture embedded in the trades
will combine each day with local effects to induce a new round of
showers and possible thunderstorms especially during the afternoons
hours across puerto rico, but not widespread precipitation is
expected. Looking well ahead we can see the repetition of the same
weather pattern of developing surface highs between surfaces lows
until at least the next weekend.

Model guidance suggest that the upper level ridge over the northeast
caribbean is expected to erode during the weekend allowing more
moisture transport across the local islands Saturday, Sunday and
early in the week. This weakening upper ridge will allow old frontal
boundaries remnants to induce and increase in showers and possible
thunderstorms across the region until at least Monday.

Aviation MainlyVFR conditions are expected to prevail across all
taf sites through at least 30/16z. Some showers can be expected in
the vicinity of tjps and tjmz this afternoon. Low level winds will
be mainly north to northeast at 10 to 15 kts.

Marine Early this morning buoy 41043 indicated a long period
northerly swell of 17 seconds with 7 feet seas. This swell is
expected to impact the atlantic waters today and tonight, but is
expected to decay rapidly on Friday. This swell will induce a
high risk of rip currents for the northern beaches of pr. Two
additional northerly swells one associated to the surface low over
the central atlantic and another one from a low that should enter
the NW atlantic on Saturday are expected to keep hazardous seas
and marine conditions at the northern coasts of the islands
through the weekend.

Preliminary point temps/pops
Sju 83 75 85 76 / 20 20 20 20
stt 85 73 85 75 / 20 20 20 40

Sju watches/warnings/advisories
Pr... High rip current risk through this afternoon for north central-
northeast-northwest-san juan and vicinity-southeast-western
interior.

Vi... None.

Am... None.

Short term... Fc
long term... .Jf


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MGIP4 - 9759110 - Magueyes Islands, PR 7 mi50 min SSW 8 G 11 80°F 83°F1015.4 hPa
IMGP4 7 mi38 min S 4.1 G 8.9 88°F
MGZP4 - 9759394 - Mayaguez, PR 21 mi56 min ENE 1.9 G 11 86°F 82°F1015.3 hPa
42085 - Southeast of Ponce, PR 22 mi68 min SSE 9.7 G 12 82°F 1014.8 hPa
PTRP4 33 mi38 min NNE 8.9 G 16 81°F
41115 - Rincon, Puerto Rico (181) 34 mi45 min 81°F5 ft
JOXP4 - Jobos Bay Reserve, Puerto Rico 37 mi113 min SSW 2.9 84°F 1016 hPa68°F
AROP4 - 9757809 - Arecibo, PR 37 mi50 min NE 8 G 11 80°F

Wind History for Magueyes Island, PR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure

Wind History from JPS (wind in knots)
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Last 24hr--CalmCalm----------------SW8SW8------NE5NE5CalmCalm--Calm--Calm
1 day ago------------------------------SW5Calm--CalmCalmCalmCalm----
2 days ago------------------------------------CalmCalm--CalmCalmCalm

Tide / Current Tables for Guanica, Puerto Rico
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Guanica
Click for Map
Thu -- 06:23 AM AST     Sunrise
Thu -- 08:28 AM AST     Moonrise
Thu -- 02:45 PM AST     -0.07 feet Low Tide
Thu -- 06:40 PM AST     Sunset
Thu -- 09:28 PM AST     Moonset
Thu -- 11:00 PM AST     0.44 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.40.30.30.30.30.30.20.20.20.10.10-0-0.1-0.1-000.10.20.30.40.40.4

Tide / Current Tables for Magueyes Island, Caribbean Sea, Puerto Rico
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Magueyes Island
Click for Map
Thu -- 06:23 AM AST     Sunrise
Thu -- 08:29 AM AST     Moonrise
Thu -- 02:27 PM AST     -0.07 feet Low Tide
Thu -- 06:41 PM AST     Sunset
Thu -- 09:28 PM AST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.40.40.30.30.30.30.20.20.20.10.10-0-0.1-0.1-000.10.20.30.30.40.4

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

GOES Local Image of Puerto Rico    EDIT
Geos

Wind Forecast for (12,3,4,5)
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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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Disclaimer:
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.