Thursday, August13, 2020
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Marine Weather and Tides
Tallaboa, PR

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:08AMSunset 6:56PM Thursday August 13, 2020 11:08 PM AST (03:08 UTC) Moonrise 12:57AMMoonset 2:19PM Illumination 23% Phase: Waning Crescent; Moon at 25 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- 839 Pm Ast Thu Aug 13 2020
Rest of tonight..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 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.
Friday night..Northeast winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers through the night.
Saturday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers.
Saturday night..Northeast winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Scattered showers and isolated Thunderstorms.
Sunday..East winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 10 seconds. Isolated Thunderstorms. Scattered showers.
Monday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Isolated showers.
Tuesday..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated showers.
AMZ700 839 Pm Ast Thu Aug 13 2020
Synopsis for puerto rico and the uS. Virgin islands waters... Moderate to fresh trade winds will persist across the regional waters through the end of the work-week, resulting in choppy seas. Tropical storm josephine is still forecast to track north of the region during the weekend. This could result in some hazardous marine conditions, mainly across the offshore atlantic waters, as well as an increase in shower and isolated Thunderstorm activity.


7 Day Forecast for Marine Location Near Tallaboa, PR
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location: 17.98, -66.76     debug


Area Discussion for - San Juan, PR
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FXCA62 TJSJ 140122 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 922 PM AST Thu Aug 13 2020

UPDATE.

As explained below, expect a seasonal weather pattern with just a few passing showers across the windward sections while mostly clear skies and fair weather elsewhere. The previous forecast remains unchanged.

Based on the latest Tropical Cyclone Advisory, Josephine is forecast to pass off to the northeast of the islands over the weekend.

AVIATION.

VFR conditions will prevail through the forecast period. Quick passing SHRA/-SHRA remains possible across JSJ/IST/ISX/NCM/KPK overnight. Convection will develop across the mountains and SW-PR btwn 14/17-22z. Winds are forecast from the E-NE at less than 10 knots, increasing at 10-20 knots after 14/13z.

MARINE.

Mariners can expect choppy seas up to 5 feet due to winds between 15 and 20 knots. Tropical Storm Josephine is still expected to pass north of the area during the upcoming weekend, therefore, mariners should monitor the evolution of this tropical cyclone.

PREV DISCUSSION. /issued 450 PM AST Thu Aug 13 2020/

SYNOPSIS . A seasonable weather pattern is expected to continue across the islands tonight into Friday with some passing showers across eastern Puerto Rico and the USVI during the overnight and early morning hours followed by the development of afternoon convection across western Puerto Rico. Tropical Storm Josephine is still expected to track to the north of the islands during the weekend. No direct impacts are expected, however, some of the outer moisture bands associated with the tropical cyclone may affect the region and result in some rainfall activity.

SHORT TERM . Tonight through Saturday .

Relatively dry weather conditions are expected to continue this evening due to a very dry air mass in place. However, by later tonight into Friday, a band of low-level moisture located just to the northeast will move over the area. This may result in some passing showers across portions of eastern and northeastern Puerto Rico and in and around the USVI during the overnight and early morning hours followed by the development of afternoon convection across western and southwestern portions of Puerto Rico as the low-level flow switches to the east-northeast. Late Friday night into early Saturday morning, guidance shows a surface induced band of moisture moving into the northern U.S. Virgin Islands and eastern Puerto Rico. Then, subsidence ahead of Josephine will limit shower activity on Saturday afternoon. Later Saturday evening, as the center of Josephine is northeast of the area, some of the external moisture bands could deteriorate weather conditions, especially across the Atlantic waters and northern and eastern portions of Puerto Rico and the northern USVI.

PREV DISCUSSION . /issued 451 AM AST Thu Aug 13 2020/

LONG TERM . Sunday through Friday .

Model guidance, especially the GFS, has become increasingly keen on the development of a dry slot on Sunday as Josephine moves well north of the area. If this dry slot comes to fruition as model guidance is currently suggesting, then very limited shower activity can be expected for most of the daylight hours of Sunday. After this dry slot passes through the area, another band of moisture trailing the tropical cyclone is expected to move over the area Sunday night into Monday. This may bring in some additional rainfall activity to the local area, mainly across eastern Puerto Rico and the USVI. Behind this moisture band, a large disorganized disturbance will bring patches of moisture to the region, increasingly so by Tuesday night. This will help to sustain a typical pattern across the local islands, with afternoon showers and isolated thunderstorms, especially in western Puerto Rico, and passing showers overnight and into the morning, mostly in the east.

During midweek, the effects of another tropical wave are likely to be seen over the area, as it passes by to the south. The bulk of the moisture is forecast to stay generally south of the islands, but increasing moisture is still likely. As such, showers are likely to be more widespread and slightly more vigorous. A patch of dry air will sweep into the region behind the wave for Thursday. There will remain sufficient moisture to support some of the typical shower activity, but it is likely to be somewhat inhibited.

And, for the end of the workweek, yet another tropical wave is forecast to approach the region. Conditions aloft are forecast to become a bit more favorable for convection, as well, with an upper- level trough stretching over the area from the east, as well as a weak trough in the mid-latitudes. Widespread and vigorous shower activity is expected associated with this wave.

AVIATION . VFR conditions are expected to prevail. Isold SHRA to dvlp in wrn PR with brief lcl MVFR conds psbl including at TJMZ. SHRA should dissipate by 13/22Z. Sfc winds E 10-20 kt and strongest near the coast with sea breeze influences bcmg 12kt or less aft 13/23Z. Max winds E 25-30 kt btwn FL030-045 and SSW 25-30 kt btwn FL420-435.

MARINE . Moderate to locally fresh easterly winds will continue to result in seas ranging between 3 and 6 feet across the regional waters, with the highest seas expected to be across the offshore waters. Tropical Storm Josephine is still expected to pass north of the area during the upcoming weekend, therefore, no direct impacts are expected. However, some hazardous seas may be possible, mainly across the offshore Atlantic waters.

PRELIMINARY POINT TEMPS/POPS. SJU 80 88 79 88 / 40 30 40 50 STT 81 91 79 91 / 30 30 40 50

SJU WATCHES/WARNINGS/ADVISORIES. PR . None. VI . None. AM . None.

SHORT TERM . CAM LONG TERM . GL PUBLIC DESK . LIS


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
42085 - Southeast of Ponce, PR 14 mi69 min ENE 14 G 16 86°F 85°F4 ft1012.7 hPa (+1.0)
MGIP4 - 9759110 - Magueyes Islands, PR 15 mi51 min Calm G 1 83°F 86°F1013.9 hPa
MGZP4 - 9759394 - Mayaguez, PR 27 mi57 min 81°F 87°F1014.7 hPa
JOXP4 - Jobos Bay Reserve, Puerto Rico 29 mi84 min ENE 1 84°F 1015 hPa74°F
PTRP4 37 mi24 min E 5.1 G 7 81°F
41115 - Rincon, Puerto Rico (181) 39 mi43 min 86°F2 ft
SJNP4 - 9755371 - San Juan, PR 48 mi51 min ENE 11 G 14 84°F 86°F1014.6 hPa
41053 - San Juan, PR 49 mi69 min ENE 14 G 16 84°F 84°F1013.3 hPa (+0.8)

Wind History for Penuelas (Punta Guayanilla), PR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure

Link to 5 minute data for TJPS

Wind History from JPS (wind in knots)
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Last 24hr--------------------------------------E5NE5NE5--Calm
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Tide / Current Tables for Playa de Ponce, Puerto Rico
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Playa de Ponce
Click for Map
Thu -- 12:56 AM AST     Moonrise
Thu -- 06:08 AM AST     Sunrise
Thu -- 06:59 AM AST     0.05 feet Low Tide
Thu -- 02:18 PM AST     Moonset
Thu -- 06:53 PM AST     Sunset
Thu -- 08:02 PM AST     0.83 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.70.70.60.50.40.20.100.10.10.10.20.30.40.50.60.70.80.80.80.80.80.80.8

Tide / Current Tables for Guanica, Puerto Rico
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Guánica
Click for Map
Thu -- 12:57 AM AST     Moonrise
Thu -- 06:09 AM AST     Sunrise
Thu -- 07:30 AM AST     0.04 feet Low Tide
Thu -- 02:19 PM AST     Moonset
Thu -- 06:54 PM AST     Sunset
Thu -- 07:19 PM AST     0.72 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.60.60.50.30.20.1000.10.10.20.30.40.50.60.60.70.70.70.70.70.70.7

Weather Map
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wmap_A
GEOS Local Image of    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (23,6,7,8)
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Ground Weather Radar Station Puerto Rico,Virgin Islands
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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 numerous 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.