Saturday, February27, 2021
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Marine Weather and Tides
Las Marías, PR

Version 3.4
NOTICE
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:47AMSunset 6:35PM Saturday February 27, 2021 5:29 AM AST (09:29 UTC) Moonrise 7:07PMMoonset 7:10AM Illumination 100% Phase: Full Moon; Moon at 15 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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AMZ742 Coastal Waters Of Northwestern Puerto Rico Out 10 Nm- 351 Am Ast Sat Feb 27 2021
.small craft advisory in effect through late Sunday night...
Today..East winds 20 to 25 knots. Seas 6 to 8 feet with occasional seas up to 10 feet. Dominant period 8 seconds. North swell around 4 feet. Isolated showers.
Tonight..East winds 20 to 25 knots. Seas 6 to 8 feet with occasional seas up to 10 feet. Dominant period 7 seconds. North swell around 4 feet shifting to the east after midnight. Isolated showers.
Sunday..Northeast winds 20 to 25 knots. Seas 6 to 8 feet with occasional seas up to 10 feet. Dominant period 7 seconds. Southeast swell around 4 feet. Scattered showers.
Sunday night..Northeast winds 15 to 20 knots. Seas 5 to 7 feet with occasional seas up to 9 feet. Dominant period 7 seconds. Southeast swell around 4 feet in the evening. Isolated showers.
Monday..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated showers.
Tuesday..Northeast winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 8 seconds. Isolated showers.
Wednesday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Scattered showers.
AMZ700 351 Am Ast Sat Feb 27 2021
Synopsis for puerto rico and the uS. Virgin islands waters... Building surface high pressure across the western atlantic ocean will produce fresh to strong east northeast winds across the regional waters. As a result, hazardous and rough seas will continue and small craft advisory conditions will last through early next week. However, the choppy wind driven seas are forecast to continue for the offshore atlantic waters for the rest of the week.


7 Day Forecast for Marine Location Near Las Mar�as, PR
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location: 18.22, -67     debug


Area Discussion for - San Juan, PR
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FXCA62 TJSJ 270837 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 437 AM AST Sat Feb 27 2021

SYNOPSIS. Strong winds will continue across the region due to a surface high pressure to the north, with sustained winds 20 to 25 mph expected. These winds are causing hazardous marine conditions through early in the workweek. A group of showers is expected to move across the islands later tonight, increasing the potential for passing showers. In the long term, significant rainfall are not expected.

SHORT TERM. Today through Monday . An easterly perturbation moved overnight across the region and scattered shower activity was observed across much of northern and eastern half of Puerto Rico. The Doppler radar estimated between half to an inch of rain, mainly over the northeast to north central coastal areas of the island. Gusty winds between 25-32 mph were observed with the showers and minimum temperatures ranged from the mid 60s across the higher elevations to the mid 70s across coastal areas in general.

Strong east to northeast winds will continue across the region through the short term period, in response to a building high pressure at the surface to our north. This will promote a cool advective pattern across the region, favoring shower development along the northern and eastern sections of Puerto Rico and across the U.S. Virgin Islands. Sustained winds between 20-25 mph and gusts up to 35 mph are expected through the weekend, mainly across coastal areas. Another easterly perturbation is expected to move tonight into Sunday morning across the islands, enhancing once again shower activity over northeastern and north central Puerto Rico. Across west/southwest PR, overall fair weather conditions should prevail with gusty winds through the period. By early Monday morning, the remnants of a front are forecast to move quickly across the Atlantic waters and across the islands, increasing shower activity once again during the overnight hours and a drier air mass will follow during the day and promote more stable conditions across the region.

LONG TERM. Tuesday through Sunday . A low to mid level high pressure will continue to be the dominant feature as we extend into the long-term period. The global models show an upper level trough developing over the central Atlantic, but this feature won't appear to have a strong influence over the local islands. In fact, the mid-level ridge will maintain the trade cap inversion through at least mid-week. Additionally, at the lower levels precipitable water values are expected to range from 0.8 to 1.3 inches of water. During this period, only shallow moisture embedded in the trade winds will drag a few showers across the islands, but without leaving significant rainfall accumulation.

By the latter part of the workweek, a polar trough will exist the eastern coast of the U.S., causing the ridge to flatten out. By late Thursday into Friday, the forecast sounding from the GFS shows a weaker trade wind cap. As a result, moisture a little deeper will be able to enter the forecast area, increasing shower activity a little bit. Moving into the weekend, another mid to upper level ridge is expected to develop over the western Caribbean, which once again will act to limit the potential for vertical development across the islands. Precipitable water values are expected to remain on the low side, with only occasional patches of moisture being displaced from the east from time to time.

AVIATION. Mainly VFR conditions are expected to prevail across all terminals during the next 24 hours. However, SHRA may cause brief MVFR conds at TJSJ and TJBQ through the period and mtn top obscd ovr eastern and north central PR. SCT/BKN cigs from FL040-FL090. Surface winds from the east at 20-25 kt with higher gusts expected through the weekend.

MARINE. Hazardous marine conditions continue across most of the local waters, except southwestern Puerto Rico, with building seas up to 10 feet. This is due to a strong surface high pressure that is causing fresh to strong winds across the waters, 20 to 25 knots and stronger gusts. These conditions are expected to continue through early in the workweek. As a result, Small Craft Advisories are in effect.

For the beaches, there is a High Rip Current Risk statement for the the northern, eastern, and southeastern Coast of Puerto Rico, as well as for Vieques, Culebra, and St. Thomas and St. Croix.

PRELIMINARY POINT TEMPS/POPS. SJU 84 73 84 73 / 50 60 60 60 STT 85 73 84 73 / 40 50 50 50

SJU WATCHES/WARNINGS/ADVISORIES. PR . High Rip Current Risk through late Sunday night for Culebra- North Central-Northeast-Northwest-San Juan and Vicinity- Southeast.

High Rip Current Risk from 6 AM AST this morning through late Sunday night for Central Interior-Vieques.

VI . High Rip Current Risk through late Sunday night for St Croix.

High Rip Current Risk from 6 AM AST this morning through late Sunday night for St Thomas. St John. and Adjacent Islands.

AM . Small Craft Advisory until 2 AM AST Monday for Caribbean Waters of Puerto Rico from 10 NM to 17N-Anegada Passage Southward to 17N-Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N-Coastal Waters of Northern Puerto Rico out 10 NM- Coastal Waters of Northern USVI and Culebra out 10 NM- Coastal Waters of Northwestern Puerto Rico out 10 NM- Coastal Waters of Southern Puerto Rico out 10 NM-Coastal Waters of Southern USVI Vieques and Eastern Puerto Rico out 10 NM-Mona Passage Southward to 17N.



SHORT TERM . DS LONG TERM . ERG


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MGZP4 - 9759394 - Mayaguez, PR 8 mi59 min 75°F 80°F1017.6 hPa
MGIP4 - 9759110 - Magueyes Islands, PR 17 mi59 min NE 1.9 G 4.1 74°F 1016.8 hPa
PTRP4 17 mi29 min ENE 8.9 G 17 73°F
41115 - Rincon, Puerto Rico (181) 18 mi33 min 80°F4 ft
42085 - Southeast of Ponce, PR 35 mi89 min ENE 14 G 18 78°F 79°F4 ft1015.9 hPa (-1.0)
JOXP4 - Jobos Bay Reserve, Puerto Rico 45 mi104 min ENE 4.1 75°F 1018 hPa67°F

Wind History for Mayaguez, PR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure

Link to 5 minute data for TJMZ

Wind History from JMZ (wind in knots)
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Tide / Current Tables for Mayaguez, Puerto Rico
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Mayaguez
Click for Map
Sat -- 02:07 AM AST     -0.21 feet Low Tide
Sat -- 04:19 AM AST     Full Moon
Sat -- 06:48 AM AST     Sunrise
Sat -- 07:10 AM AST     Moonset
Sat -- 08:54 AM AST     1.57 feet High Tide
Sat -- 03:19 PM AST     0.27 feet Low Tide
Sat -- 06:34 PM AST     Sunset
Sat -- 07:07 PM AST     Moonrise
Sat -- 08:39 PM AST     1.14 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.1-0.1-0.2-0.10.10.50.91.21.51.61.51.20.90.60.40.30.30.50.70.91.11.110.8

Tide / Current Tables for Puerto Real, Puerto Rico
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Puerto Real
Click for Map
Sat -- 02:01 AM AST     -0.15 feet Low Tide
Sat -- 04:19 AM AST     Full Moon
Sat -- 06:48 AM AST     Sunrise
Sat -- 07:10 AM AST     Moonset
Sat -- 08:51 AM AST     1.14 feet High Tide
Sat -- 03:14 PM AST     0.20 feet Low Tide
Sat -- 06:34 PM AST     Sunset
Sat -- 07:08 PM AST     Moonrise
Sat -- 08:36 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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0.1-0.1-0.2-0.10.10.40.70.91.11.11.10.90.70.40.30.20.20.40.50.70.80.80.70.5

Weather Map
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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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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.