Saturday, August8, 2020
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Marine Weather and Tides
Playita Cortada, 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 6:06AMSunset 6:58PM Saturday August 8, 2020 1:38 AM AST (05:38 UTC) Moonrise 10:26PMMoonset 10:09AM Illumination 82% Phase: Waning Gibbous; Moon at 19 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- 932 Pm Ast Fri Aug 7 2020
.small craft should exercise caution...
Rest of tonight..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated showers through the night.
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.
Saturday night..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated showers through the night.
Sunday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated showers.
Sunday 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 through the night.
Monday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers.
Tuesday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers.
Wednesday..East winds 15 to 20 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Scattered showers and isolated Thunderstorms.
AMZ700 932 Pm Ast Fri Aug 7 2020
Synopsis for puerto rico and the uS. Virgin islands waters... Moderate to fresh easterly wind flow is expected across the regional waters for the next couple of days. Seas of up to 5 feet will persist across most of the waters tonight. The southern portion of the caribbean waters and the Mona passage will have seas up to 6 feet through Sunday. The tropical wave will leave the local waters late tonight followed by drier air with some saharan dust. Seas will again be below 5 feet early next week.


7 Day Forecast for Marine Location Near Playita Cortada, PR
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location: 17.98, -66.45     debug


Area Discussion for - San Juan, PR
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FXCA62 TJSJ 080151 AAA AFDSJU

Area Forecast Discussion . UPDATED National Weather Service San Juan PR 951 PM AST Fri Aug 7 2020

UPDATE. Sounding from 08/00Z was still moist with 1.98 inches of precipitable water, but limited radar coverage indicates only minor shower activity and none over land at this time. Axis of the tropical wave is now exitting the area. Satellite imagery also indicates Saharan dust following the moist air closely. While visibilities are not expected to be reduced to below 10 miles, hazy conditions will be noticeable. 500 mb temperatures will remain about the same Saturday into Sunday at around minus 5.5 to minus 6 and so there is a chance for isolated thunderstorms for a few hours both Saturday and Sunday afternoon in western Puerto Rico. Minor changes to the grids have been introduced.

AVIATION. VFR conds are expected to prevail thru 09/02Z. Brief MVFR in SHRA/TSRA and mtn obscurations psbl btwn 08/17-21Z in wrn PR. Sfc winds E less than 11 kts, bcmg aft 08/14Z 10-20 kt, strongest near the coast where sea breezes will influence. Max winds ESE 20-30 kt btwn FL100-210.

MARINE. Seas will diminish beginning Sunday afternoon as winds subside. Winds and seas will rise again with the next wave passage on Thursday.

PREV DISCUSSION. /issued 335 PM AST Fri Aug 7 2020/

SYNOPSIS . A mostly benign weather pattern is expected throughout the weekend and into early next week as mid to upper- level ridge and a relatively dry air mass prevail over the area. The next tropical wave is expected by the middle of next week.

SHORT TERM . Tonight through Sunday .

Shower and isolated thunderstorm activity across the area should diminish by the early evening hours as a much drier air mass behind a quick moving tropical wave arrives. Therefore, mainly fair weather conditions with a slight chance of a few showers can be expected overnight. The weather pattern during the upcoming weekend is expected to be fairly benign as the combination of a mid to upper-level ridge and a drier than normal air mass will serve to limit shower activity across the area. Low-level moisture may still be sufficient enough to generate some overnight and early morning passing trade wind showers across the local waters, briefly affecting portions of eastern PR and the USVI, followed by the development of afternoon convection across western Puerto Rico. Significant rainfall accumulations are not expected. Somewhat hazy skies due to the presence of suspended Saharan Dust particulates are also expected. However, significant dust concentrations are not expected.

LONG TERM . Monday through Saturday .

PREV DISCUSSION . /issued 429 AM AST Fri Aug 7 2020/

To start the workweek, high pressure will dominate all levels of the atmosphere in the central Atlantic, with a secondary high extending into the western Atlantic. This will promote fairly benign conditions across the region, with the usual easterly winds at 10 to 20 mph. Patches of low-level moisture are expected to pass through Monday and Tuesday, yet very dry and warm air aloft will make conditions hostile for shower activity. The moisture moving through will likely drive some showers over western Puerto Rico for both Monday and Tuesday, but these showers will likely be unimpactful. Though the showers will not be very strong, persistent showers over a given area can still produce ponding of water.

The next tropical wave arrives Wednesday in the afternoon or evening. Generally the models have been trending to a somewhat weaker system, yet this wave will still very likely increase shower and thunderstorm activity across the region. Forecast models suggest the wave will last through Thursday morning, after which more dry air will move in. During the wave, the biggest threat will be urban and small stream flooding. Only passing showers are expected once the wave moves out and through Friday. Models suggest another tropical wave arrives for Saturday evening.

AVIATION . Approaching tropical wave will cause VCSH across the local terminals in PR and the USVI this afternoon. However, VCTS is possible at TJBQ/TJMZ through 08/21Z. The winds will be from the east to ESE at around 15 kt with occasional gusts this afternoon, decreasing to 10kt or less after 08/00Z. ISOL/SCT SHRA overnight but the terminals are expected to remain VFR.

MARINE . Fairly tranquil seas of between 2 and 5 feet are expected to continue through early this evening. However, fresh easterly winds of up to 20 knots later tonight and throughout the weekend will result in choppy seas of up to 6 feet, mainly across the offshore Caribbean waters and Mona Passage. A return to more tranquil seas is expected by early next week as the winds diminish.

PRELIMINARY POINT TEMPS/POPS. SJU 79 90 79 90 / 30 20 10 20 STT 80 90 80 90 / 10 20 20 20

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

SHORT TERM . WS LONG TERM . CS PUBLIC DESK . FRG


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
42085 - Southeast of Ponce, PR 9 mi99 min ENE 16 G 19 85°F 85°F3 ft1017.6 hPa (+0.0)
JOXP4 - Jobos Bay Reserve, Puerto Rico 12 mi114 min ENE 1.9 83°F 1020 hPa74°F
MGIP4 - 9759110 - Magueyes Islands, PR 32 mi51 min ESE 2.9 G 5.1 83°F 85°F1018.3 hPa
SJNP4 - 9755371 - San Juan, PR 38 mi51 min E 8.9 G 11 83°F 85°F1019.1 hPa
41053 - San Juan, PR 39 mi99 min ESE 9.7 G 14 84°F 84°F3 ft1018.1 hPa (+0.0)
MGZP4 - 9759394 - Mayaguez, PR 41 mi57 min 80°F 86°F1019.1 hPa

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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Tide / Current Tables for Playa Cortada, Puerto Rico
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Playa Cortada
Click for Map
Sat -- 12:40 AM AST     0.67 feet High Tide
Sat -- 02:20 AM AST     0.39 feet Low Tide
Sat -- 06:06 AM AST     Sunrise
Sat -- 10:09 AM AST     Moonset
Sat -- 12:34 PM AST     0.58 feet High Tide
Sat -- 01:44 PM AST     0.36 feet Low Tide
Sat -- 06:55 PM AST     Sunset
Sat -- 10:26 PM AST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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Tide / Current Tables for Playa de Ponce, Puerto Rico
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Playa de Ponce
Click for Map
Sat -- 12:23 AM AST     0.67 feet High Tide
Sat -- 02:44 AM AST     0.39 feet Low Tide
Sat -- 06:07 AM AST     Sunrise
Sat -- 10:10 AM AST     Moonset
Sat -- 12:17 PM AST     0.58 feet High Tide
Sat -- 02:08 PM AST     0.36 feet Low Tide
Sat -- 06:56 PM AST     Sunset
Sat -- 10:26 PM AST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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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 (1,6,7,8)
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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.