Saturday, November18, 2017 L-36.com


Marine Weather and Tides
Gu�nica, 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 6:34AMSunset 5:51PM Saturday November 18, 2017 4:29 AM AST (08:29 UTC) Moonrise 6:35AMMoonset 6:16PM Illumination 0% Phase: New Moon; Moon at 29 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- 844 Pm Ast Fri Nov 17 2017
Rest of tonight..South winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 8 seconds. Scattered showers.
Saturday..Southwest winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Scattered showers through the day. Isolated Thunderstorms in the afternoon.
Saturday night..South winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Isolated Thunderstorms in the evening. Scattered showers through the night.
Sunday..Southeast winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Numerous showers and isolated Thunderstorms.
Sunday night..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Isolated showers.
Monday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Isolated showers.
Tuesday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Isolated showers.
Wednesday..East winds 5 to 10 knots. Seas 2 feet or less. Dominant period 8 seconds. Isolated showers.
AMZ700 844 Pm Ast Fri Nov 17 2017
Synopsis for puerto rico and the uS. Virgin islands waters... A shear line and associated moisture along will linger across the atlantic waters through the weekend. Southerly winds of 10 to 15 kts induced by a frontal trough will prevail across the regional waters. Showers and Thunderstorms will remain possible across the local waters through Monday. A northerly swell is forecast to reach the atlantic waters through Saturday.

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 180117
afdsju
area forecast discussion
national weather service san juan pr
917 pm ast Fri nov 17 2017

Update Recent tjsj upper air sounding data and satellite
imagery continued to suggest a fairly moist and unstable
environment under a dominant south to southwest low level wind
flow. Proximity of the elongated upper trough across the west
atlantic will continue to erode the ridge aloft and provide good
ventilation and instability to maintain potential for shower and
thunderstorms development across the region through most of the
weekend.A gradual improvement expected by Sunday into Monday. Only
minor changes made to the inherited short term forecast for now.

The flash flood watch will continue for communities downstream
from the guajataca dam, especially the low lying areas along the
river through Saturday, and probably will be extended as long as
the potential exists for dam failure due to flash flooding.

Aviation update Multiple bkn-ovc clds lyrs nr fl100... Fl150... Fl200
and sct ocnl bkn nr fl030-fl060. PrevailingVFR, but passing shra -shra
over islands, with isold tsra ovr atl waters and en route btw pr and
the usvi. Brief mtn top obscr ovr ctrl and E pr due to low clds and
passing -shra til 18 12z. Wnds veering fm s-sw 15-25 kts blo fl250,
then bcmg fm W and incr W ht abv.

Marine No change to previous marine forecast discussion. Seas
of 3-5 feet most of the local waters... Except 1-3 feet near shore
waters of western pr. Winds 10 to 15 kts. Offshore atlantic buoy
suggests a 12-14 sec nrly swell arriving across the local waters
and expected to continue through Saturday night.

Prev discussion issued 439 pm ast Fri nov 17 2017
synopsis...

a mid to upper level trough will amplify over the western
caribbean sea into the weekend. A shear line will continue near
the islands through next week. The islands are forecast to
continue under a southerly wind flow.

Short term...

showers and thunderstorms are possible across the across the u.S.

Virgin islands and the eastern, interior and southern portions of
puerto rico through the overnight hours due to the combination of
surface convergence and diffluence aloft. In addition, a shear
line will aid in the formation of showers and thunderstorms across
the mona passage and atlantic waters of puerto rico. The southerly
wind flow continues to push a moist air mass over the islands.

Today we tied the record high temperature at the luis munoz marin
airport. This tied the old record of 91 fahrenheit set in 1983.

The combination of a weak frontal boundary, an induced surface
trough, a southerly wind flow and good ventilation aloft will
enhance showers and thunderstorm convection on Saturday. This
activity could increase the risk for flooding as well as mudslides
along steep terrains mainly across the u.S. Virgin islands and the
interior and eastern sections of puerto rico.

Long term...

a mid to upper level ridge is expected to build across the forecast
area early next week and hold much of the forecast period. As this
feature strengthens mon-tue, available low level moisture is
expected to quickly erode with precipitable water values remaining
below the normal range tue-fri. At lower levels, east to east
southeast winds will prevail across the local isles as a surface
high dominates the central atlantic. Under the aforementioned
pattern, expect mainly fair and stable weather condition much of
the next week with trade wind showers across usvi and E pr as well
as some locally induced afternoon showers across west areas of
puerto rico.

Aviation...

vcsh vcts across the local terminals today with MVFR cigs
possible across puerto rico eastern terminal sites. Sfc winds out
of the S to SW at 10 to 15 kts but fl340 - fl400 winds are out of
the SW to W at 20 to 30 kts. Vcsh vcts should diminish across the
western terminals by 19 00z then continue to the eastern terminals
by 18 03z.

Marine...

although seas and winds are expected below 5 feet and at less than
18 knots, mariners should exercise caution due to the possibility
of shower and thunderstorm development mainly across caribbean
passages and atlantic waters. A northerly swell is forecast to
move across the local waters of the atlantic waters by Saturday.

Preliminary point temps pops
Sju 77 86 78 87 40 60 60 60
stt 78 85 79 87 50 60 60 40

Sju watches warnings advisories
Pr... Flash flood watch through Saturday afternoon for northwest-
western interior.

Vi... None.

Am... None.

Short term... Ram
long term... .Ram


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
42085 - Southeast of Ponce, PR 22 mi89 min NNW 5.8 G 9.7 80°F 83°F1007.4 hPa (-1.4)

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 24hrW3E1N2N1----------------------CalmCalmE2S2S4S5S6S6S8
1 day agoSW3SW31E2----------------------SW52S2NE1W2W3S3E2S6
2 days ago--SE2SE4------------------------NE2NE3E3S8
G14
S8S9S9SE7
G13
W3

Tide / Current Tables for Guanica, Puerto Rico
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Guanica
Click for Map
Sat -- 12:46 AM AST     0.11 feet Low Tide
Sat -- 06:34 AM AST     Moonrise
Sat -- 06:35 AM AST     Sunrise
Sat -- 07:42 AM AST     New Moon
Sat -- 08:44 AM AST     0.77 feet High Tide
Sat -- 05:50 PM AST     Sunset
Sat -- 06:16 PM AST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.10.10.10.20.30.50.60.70.80.80.80.70.70.60.60.50.50.40.40.30.30.20.20.1

Tide / Current Tables for Magueyes Island, Caribbean Sea, Puerto Rico
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Magueyes Island
Click for Map
Sat -- 12:28 AM AST     0.11 feet Low Tide
Sat -- 06:35 AM AST     Moonrise
Sat -- 06:35 AM AST     Sunrise
Sat -- 07:42 AM AST     New Moon
Sat -- 10:06 AM AST     0.77 feet High Tide
Sat -- 05:50 PM AST     Sunset
Sat -- 06:16 PM AST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.10.10.20.20.30.40.50.60.70.80.80.80.70.70.60.60.50.50.40.40.30.20.20.1

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 (3,6,7,8)
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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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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.