Thursday, April27, 2017 L-36.com


Marine Weather and Tides
Ponce, 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 6:00AMSunset 6:47PM Thursday April 27, 2017 12:57 PM AST (16:57 UTC) Moonrise 7:06AMMoonset 8:13PM Illumination 3% Phase: Waxing Crescent; Moon at 2 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- 956 Am Ast Thu Apr 27 2017
.small craft should exercise caution...
Rest of today..East winds 15 to 20 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers through the day.
Tonight..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated showers through the night.
Friday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated showers.
Friday 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.
Saturday..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated showers.
Sunday..East winds 15 to 20 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers.
Monday..East winds 15 to 20 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Isolated showers.
AMZ700 956 Am Ast Thu Apr 27 2017
Synopsis for puerto rico and the uS. Virgin islands waters... Strong surface high pressure across the north central atlantic will move slowly south and extend into the western atlantic through the weekend and persist north of the area through midweek next week. This will promote moderate to locally fresh trade winds through the forecast period. Seas will increase during the weekend in response to the tightening of the pressure gradient across the atlantic waters.

7 Day Forecast for Marine Location Near Ponce, PR
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location: 17.97, -66.62     debug


Area Discussion for - San Juan, PR
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Fxca62 tjsj 271506 aaa
afdsju
area forecast discussion... Updated
national weather service san juan pr
1106 am ast Thu apr 27 2017

Update Little change to the forecast except to make a little
more certain that showers and thunderstorms will occur in the
western portion of puerto rico. Models are bringing in better
moisture between now and 28/23z and have added some incremental
boost to the pop forecast Friday and Saturday.

Streamers have begun to form off the islands showing mostly east
flow. Clouds are also forming off EL yunque and along the
convergence from the sea breeze front to vega baja. This will
likely begin to trigger showers a little after noon. Showers and
thunderstorms will begin shortly thereafter in the west and
northwest portions of puerto rico.

Aviation Mtn obscurations will occur along most of the
cordillera central and the luquillo range otherwise no changes.

Marine Rip current risk is now high for the northwest and
north central coast of puerto rico until 6 pm ast, otherwise no
changes.

Prev discussion /issued 458 am ast Thu apr 27 2017/
synopsis... Surface high will continue across much of the atlantic
basin for the next several days. Moderate to fresh trade winds
will persist through the forecast period. Short wave trof moves
during the weekend and tutt pattern is expected through early next
week. Upper ridge builds from the west across the caribbean basin
by midweek next week.

Short term... Thursday through Saturday...

mostly clear skies prevailed overnight and early this morning across
the forecast area with limited shower activity observed over land
areas. Temperatures were in the upper 70s to low 80s at the lower
elevations under light and variable winds.

A tutt is expected to develop north of the area by Friday and hold
through the upcoming weekend with the forecast area remaining east
of its axis. At lower levels, a high pressure across the north
central atlantic will continue to promote moderate trade winds
through early the upcoming weekend. The local pressure gradient is
then expected to tighten later during the weekend as the surface
high relocates across the central atlantic and north of the islands.

This will result in moderate to fresh trades late Saturday. Although
the latest guidance continues to suggest decreasing trend in
precipitable water during the next day or so, precipitable water
will remain above the normal range.

As a result, expect a mainly fair weather pattern during the early
morning hours with shower and thunder activity increasing across the
forecast area late in the morning and afternoon hours. These showers
and thunderstorms are expected mainly across the northwest quadrant
of the island as well as portions of the san juan metro area. With
the heaviest showers, urban and small stream flooding is likely.

Friday and Saturday a similar pattern with showers in the morning
across windward areas followed by afternoon showers and
thunderstorms across west puerto rico is expected, however intensity
and coverage will increase as the tutt establishes north of the area.

Long term... Sunday through Friday...

tutt pattern to the northeast is expected to provide instability
across the area to aid the development of showers and possible isolated
thunderstorms through at least Tuesday afternoon. As upper ridge
builds from the west and surface high relocates just north of the
islands... The available moisture will be confined below 800 mb
from Wednesday through the end of the forecast period. Trade wind
showers and streamers are expected mainly across the usvi's,
culebra and vieques. Across the interior and western portions of
puerto rico, diurnally induced scattered showers are expected.

Aviation... .Vfr conds expected to prevail at all TAF sites
through the morning hours. Shra/tsra development expected aft
27/16z to result in brief periods of MVFR conds and mountain
obscurations in and around jbq/jmz and possibly jsj through
27/22z. Easterly winds 10 to 15 knots with sea breeze variations
today, becoming light and variable overnight.

Marine... Moderate to locally fresh trade winds will continue for
the next several days as surface high pressure across the central atlantic
continues to build and tighten the local pressure gradient. Short
period wind driven seas will increase across the offshore waters
and passages during the weekend. Overall, winds should remain
between 15-20 knots and highest seas around 6 feet during the
weekend across these waters. Moderate risk of rip currents
expected across much of the northern and southern beaches of the
islands.

Preliminary point temps/pops
Sju 87 76 86 75 / 60 60 50 50
stt 86 76 86 74 / 20 40 50 50

Sju watches/warnings/advisories
Pr... High rip current risk until 6 pm ast this evening for north
central-northwest-western interior.

Vi... None.

Am... None.

Short term... Ws
long term... .Ws


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
JOXP4 - Jobos Bay Reserve, Puerto Rico 21 mi133 min E 7 85°F 1017 hPa72°F
IMGP4 22 mi18 min SE 8 G 16 86°F
MGIP4 - 9759110 - Magueyes Islands, PR 23 mi40 min SSE 9.9 G 15 83°F 82°F1016 hPa
MGZP4 - 9759394 - Mayaguez, PR 33 mi46 min NW 11 G 12 82°F 85°F1015.8 hPa
AROP4 - 9757809 - Arecibo, PR 36 mi40 min ENE 8 G 18 83°F
YABP4 - 9754228 - Yabucoa Harbor, PR 42 mi40 min ENE 7 G 12
SJNP4 - 9755371 - San Juan, PR 43 mi46 min ENE 16 G 21 81°F 81°F1016.8 hPa
PTRP4 43 mi18 min NNE 7 G 12 84°F
41115 - Rincon, Puerto Rico (181) 45 mi35 min 82°F3 ft

Wind History for Penuelas (Punta Guayanilla), 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----------------------------------NE5E5----CalmCalmNE5
1 day ago----------------------------------E5NE5NE5NE5--NE5--
2 days ago----------------------------------CalmE6CalmNE6NE6--Calm

Tide / Current Tables for Playa de Ponce, Puerto Rico
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Playa de Ponce
Click for Map
Thu -- 06:01 AM AST     Sunrise
Thu -- 07:06 AM AST     Moonrise
Thu -- 01:03 PM AST     -0.18 feet Low Tide
Thu -- 06:46 PM AST     Sunset
Thu -- 08:12 PM AST     Moonset
Thu -- 10:47 PM AST     0.68 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.60.50.50.40.40.30.20.20.10-0-0.1-0.2-0.2-0.2-0.100.10.30.40.50.60.70.7

Tide / Current Tables for Punta Guayanilla, Puerto Rico
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Punta Guayanilla
Click for Map
Thu -- 06:02 AM AST     Sunrise
Thu -- 07:06 AM AST     Moonrise
Thu -- 12:58 PM AST     -0.11 feet Low Tide
Thu -- 06:46 PM AST     Sunset
Thu -- 08:13 PM AST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.60.60.50.50.40.30.20.20.10-0-0.1-0.1-0.1-0.1-0.1-000.10.20.40.50.50.6

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.