Saturday, August15, 2020
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Marine Weather and Tides
Guánica, 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 6:54PM Saturday August 15, 2020 3:04 AM AST (07:04 UTC) Moonrise 2:35AMMoonset 4:11PM Illumination 14% Phase: Waning Crescent; Moon at 26 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- 901 Pm Ast Fri Aug 14 2020
Rest of tonight..Northeast winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Isolated showers.
Saturday..Southeast winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Scattered showers.
Saturday night..Southeast winds 5 to 10 knots. Seas 2 feet or less. Dominant period 7 seconds. Isolated showers through the night.
Sunday..South winds 5 to 10 knots. Seas 2 feet or less. Dominant period 7 seconds. Isolated showers.
Sunday night..East winds 5 to 10 knots. Seas 2 feet or less. Dominant period 8 seconds. Isolated showers.
Monday..East winds 5 to 10 knots. Seas 2 feet or less. Dominant period 8 seconds. Isolated showers.
Tuesday..East winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Isolated showers.
Wednesday..East winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 8 seconds. Isolated Thunderstorms, then scattered showers.
AMZ700 901 Pm Ast Fri Aug 14 2020
Synopsis for puerto rico and the uS. Virgin islands waters... Moderate to locally fresh trade winds will persist across most of the regional waters into the weekend, resulting in choppy seas. Tropical storm josephine is still forecast to track well northeast of the region during the weekend. This will result in some rough seas for portions of the offshore atlantic waters, as well as an increase in shower and isolated Thunderstorm activity across the area.


7 Day Forecast for Marine Location Near Gu�nica, PR
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location: 17.97, -66.92     debug


Area Discussion for - San Juan, PR
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FXCA62 TJSJ 150139 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 939 PM AST Fri Aug 14 2020

UPDATE. Showers will continue to move across the windward sections overnight and until the arrival of subsidence ahead of Josephine. This area of subsidence will limit shower activity, but the moisture field associated with Josephine will increase the potential of having squally-weather across the islands, especially around noon. However, based on the latest Tropical Cyclone Advisory, Josephine is forecast to pass well off to the north of the islands over the weekend.

AVIATION. In general, VFR conditions will prevail through the forecast period. Quick passing SHRA/-SHRA remains possible across JSJ/IST/JBQ/ISX/NCM/KPK overnight. The external bands of Josephine and local effects will produce SHRA/TSRA across the USVI, as well as along the mountains and the E/W sections of PR between 15/16-23z. Winds are forecast from the E-NE at less than 10 knots, increasing at 10-20 knots after 15/13z.

MARINE.

Mariners can expect choppy seas up to 6 feet due to winds between 15 and 20 knots. Tropical Storm Josephine will deteriorate the Atlantic Offshore waters but will track off to the north of the area. Therefore, a Small Craft Advisory is in effect for the Atlantic Offshore waters tomorrow night.

PREV DISCUSSION. /issued 425 PM AST Fri Aug 14 2020/

SYNOPSIS .

Tropical Storm Josephine will pass far to our north over the weekend. However, some moisture associated with the system will produce shower activity across the region for tomorrow and Sunday. Marine conditions will become choppy as well over the outer Atlantic waters due to the storm. Multiple tropical waves are expected for the next workweek.

SHORT TERM . Rest of Today through Sunday .

Currently a high pressure ridge exists at mid to upper levels over the western Atlantic, with its associated high surface pressure over the same area. Enhanced near-surface pressure gradients associated with the surface high are driving breezy winds across the region today, and more especially tonight over the local waters of up to 20 knots. The ridge aloft is driving subsidence and warmer temperatures aloft, where the 12z sounding recorded -4.5C at 500mb. Given these conditions, thunderstorms have had a hard time developing this afternoon. A patch of moisture has been impacting the area this afternoon, bringing scattered to numerous showers over the USVI, with more activity over southwestern Puerto Rico due to the west-northwesterly wind flow. These showers will continue for the next few hours, then die down over land and continue over the local waters.

Though Tropical Storm Josephine will pass well to our north this weekend, we will still be impacted a bit by some moisture associated with the storm. Before that moisture arrives, one more patch of moisture will pass through overnight, producing scattered showers across the local waters, the USVI, and near the coast of eastern Puerto Rico. After that patch of moisture moves through, the next wave of moisture, this one associated with Josephine, is expected to move at least near our region Saturday during the daytime and into the nighttime. Forecast models are trending towards pushing most of the moisture to our north, yet an increase in shower activity is at least likely for the USVI and the Atlantic waters during this period. Given that most of this moisture is expected to not reach us, and with the ridge still in place, only moderate shower activity and probably no thunderstorms are expected in western Puerto Rico for tomorrow afternoon. Another wave of moisture being pulled up from the south by Josephine is expected for late Sunday, and that will also help to increase showers. However, we will still be under the influence of the ridge, so much of Saturday and Sunday we should see fair weather conditions. When the aforementioned areas of moisture move in, the large-scale ridging should suppress thunderstorm activity and make the showers less impactful.

LONG TERM . Monday through Saturday .

PREV DISCUSSION . /issued 407 AM AST Fri Aug 14 2020/

On Monday, moisture associated with Tropical Storm Josephine combined with a relatively weak wave will stream across the area. As such, an increase in shower activity is anticipated across the region, with afternoon showers and thunderstorms, especially in northwestern Puerto Rico. Behind the wave is a large area of disorganized patches of moisture, which are anticipated to affect the area of Tuesday. Moisture is likely to decrease late in the day, however. A typical pattern is likely on the day, with shower activity becoming more inhibited in the evening. This is due to a small area of dry air ahead of another wave.

Late on Tuesday night, a vigorous tropical wave is forecast to make its way into the area. Significantly higher moisture levels are anticipated, and shower activity is likely to be fairly widespread. The wave will linger over the area into Thursday. Once again, a drier air mass is expected to move in ahead of the next wave mid- morning on Thursday through the afternoon. The next wave is forecast to arrive overnight on Thursday night into Friday, and this one is also expected to be fairly vigorous. Another surge of moisture across the area will lead to an increase in showers. Widespread afternoon showers with isolated thunderstorms are anticipated for Friday, with the peak in activity in western and interior Puerto Rico. This will be followed by enhanced passing shower activity during the night.

On Saturday, disorganized patches of moisture will help to sustain shower activity across the area. Late in the day yet another tropical wave is forecast to approach the area. So, on the whole, next week is currently looking to be fairly repetitive.

AVIATION .

SHRA to increase over PR from NE to SW corners. Isold TSRA SW PR. Sct SHRA to cont byd 15/02Z. Some mtn obscurations to dvlp drg the period. Conds improving 15/10-16Z. Sfc winds E 10-20 kt with sea breeze influences bcmg E less than 10 kt aft 14/23Z. Max winds WSW-WNW 26-36 kt btwn FL400-460 diminishing aft 14/18Z.

MARINE .

Winds will be up to 20 knots across the local waters tonight, so small craft operators should exercise caution. Choppy marine conditions are expected over the outer Atlantic waters for the next few days as Tropical Storm Josephine passes to our north. Seas up to 7 feet are possible at the event peak, which is expected late Saturday. After Josephine passes through, more tranquil marine conditions are expected early next week.

PRELIMINARY POINT TEMPS/POPS. SJU 79 89 78 93 / 50 50 50 30 STT 80 88 80 90 / 50 40 50 40

SJU WATCHES/WARNINGS/ADVISORIES. PR . None. VI . None. AM . Small Craft Advisory from 8 PM Saturday to 8 AM AST Sunday for Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N.



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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MGIP4 - 9759110 - Magueyes Islands, PR 7 mi47 min Calm G 1 78°F 85°F1011.5 hPa
MGZP4 - 9759394 - Mayaguez, PR 21 mi53 min 79°F 86°F1012.2 hPa
42085 - Southeast of Ponce, PR 22 mi65 min E 16 G 21 83°F 85°F3 ft1010.7 hPa (-1.3)
PTRP4 33 mi20 min E 7 G 13 78°F
41115 - Rincon, Puerto Rico (181) 34 mi39 min 85°F2 ft
JOXP4 - Jobos Bay Reserve, Puerto Rico 37 mi80 min NE 2.9 80°F 1013 hPa73°F

Wind History for Magueyes Island, PR
(wind in knots)    EDIT      (on/off)   Help
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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
1 day ago------------------------------------------------
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Tide / Current Tables for Guanica, Puerto Rico
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Guánica
Click for Map
Sat -- 02:35 AM AST     Moonrise
Sat -- 06:10 AM AST     Sunrise
Sat -- 09:04 AM AST     -0.08 feet Low Tide
Sat -- 04:10 PM AST     Moonset
Sat -- 06:53 PM AST     Sunset
Sat -- 08:09 PM AST     0.80 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.70.70.70.60.50.40.20.1-0-0.1-0.1-00.10.20.30.40.50.70.70.80.80.80.80.7

Tide / Current Tables for Magueyes Island, Caribbean Sea, Puerto Rico
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Magueyes Island
Click for Map
Sat -- 02:35 AM AST     Moonrise
Sat -- 06:10 AM AST     Sunrise
Sat -- 09:47 AM AST     0.03 feet Low Tide
Sat -- 04:11 PM AST     Moonset
Sat -- 06:54 PM AST     Sunset
Sat -- 08:59 PM AST     0.93 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.70.60.50.40.30.20.10.10.10000.10.20.20.40.50.60.80.80.90.90.90.9

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 (3,6,7,8)
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Ground Weather Radar Station Puerto Rico,Virgin Islands
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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.