Monday, November30, 2020
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Marine Weather and Tides
Lomas, PR

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 6:38AMSunset 5:47PM Monday November 30, 2020 1:15 PM AST (17:15 UTC) Moonrise 6:07PMMoonset 6:44AM 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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AMZ712 Coastal Waters Of Northern Puerto Rico Out 10 Nm- 1036 Am Ast Mon Nov 30 2020
Rest of today..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 9 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 10 seconds.
Tuesday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Isolated showers.
Tuesday night..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds.
Wednesday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 9 seconds. Isolated showers.
Thursday..East winds 10 to 15 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 11 seconds. Northeast swell 4 to 5 feet. Scattered showers.
Friday..East winds 10 to 15 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 10 seconds. Scattered showers.
AMZ700 1036 Am Ast Mon Nov 30 2020
Synopsis for puerto rico and the uS. Virgin islands waters... Gentle to moderate east-northeast winds will continue across the regional waters for the next several days. Seas up to 5 feet are expected through Wednesday. A northeasterly swell is expected to deteriorate marine conditions during the second half of the work week. Only isolated to scattered showers are expected over the regional waters through much of the forecast period.


7 Day Forecast for Marine Location Near Lomas, PR
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location: 18.28, -65.93     debug


Area Discussion for - San Juan, PR
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FXCA62 TJSJ 301504 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 1104 AM AST Mon Nov 30 2020

UPDATE. Fair weather observed across the local area this morning. Relatively dry air is still present over the local area, and fair weather is expected to continue for the rest of the morning. For the afternoon, scattered showers are expected across the interior into western PR, but leaving relatively low accumulations, that said, some ponding of water in the poor drainage areas is possible, but not much more than that. Fair weather is also expected elsewhere in the afternoon. Temperatures are expected to be near normal across the islands.

AVIATION. VFR conds expected across the local terminals. VCSH is possible at TJPS this afternoon, as -SHRA is possible near the airport. Winds will be at around 10 to 15 KT from the ENE with sea breeze variations.

MARINE. Seas are expected to be up to 5 feet and winds up to 15 knots. With the exception of the offshore Caribbean waters, where winds can reach 20 knots. There is a low or moderate risk of rip currents across the local beaches.

PREV DISCUSSION. /issued 349 AM AST Mon Nov 30 2020/

SYNOPSIS . A fair weather pattern is expected to prevail across the area during the next several as relatively drier than normal air mass and a ridge aloft is expected to generally limit shower activity. Marine conditions are expected to be tranquil through the middle of the work week with seas of up to 5 feet expected.

SHORT TERM . Today through Wednesday .

A mid to upper-level ridge will hold through the short term period. This atmospheric feature will promote drier than normal conditions between the mid-levels and upper-levels. An easterly perturbation will move across the Caribbean Sea today and tomorrow. However, the bulk of the moisture will remain far to the south over the Caribbean. Therefore, fair weather conditions will prevail across the islands of Puerto Rico and the U.S. Virgin Islands. The northeasterly wind flow will push pockets of moisture at times that could bring quick passing showers mainly across the windward sections, followed by afternoon convection across the interior and western portions. At this time, model guidance is indicating that the remnants of a frontal boundary will move across the area on Wednesday, increasing the low-level moisture and the potential for observing more frequent showers.

LONG TERM . Thursday through Monday .

A ridge aloft will continue to prevail overhead through the end of the work week. This feature in combination with a drier than normal air mass will continue to result in fair weather conditions across the local islands. Surface high pressure traversing the western Atlantic will continue to result a northeasterly wind flow. This will bring shallow patches of low-level moisture into the area from time to time resulting some light trade wind showers across portions of northeastern Puerto Rico and in and around the northern USVI during the overnight and early morning hours followed by the development of some afternoon showers across the interior and southwestern quadrant of Puerto Rico.

By the upcoming weekend into early the following week, a polar trough is expected to amplify and move across the western Atlantic, weakening the ridge aloft. Along with this polar trough, model guidance is indicating that a surface low pressure and an associated front will develop off the east coast of the United States and move east-northeastward across the western Atlantic. As the associated surface front moves across the western Atlantic, the low-level winds are expected to gradually shift from the southeast to south by late in the weekend into early the following the week. Even though the ridge aloft is expected to weaken, moisture is expected to remain generally below normal, therefore, significant shower activity is not anticipated at this time during this period.

AVIATION . VFR conditions will prevail thru the forecast period. SHRA will move at times across the terminals of PR/USVI without significant impact. Cloudiness will increase across the interior of PR and downwind from the USVI between 30/16z-22z. Winds will continue calm to light and variable, and northeasterly winds will return at 10-15 kt after 30/13z.

MARINE . Fairly tranquil marine conditions are expected to prevail through the middle of the week with seas of up to 5 feet expected. A northeasterly swell is expected to deteriorate marine conditions during the second half of the work week. There is a moderate risk of rip currents for most of the north-facing as well as some of the east-facing beaches of the islands for today.

PRELIMINARY POINT TEMPS/POPS. SJU 84 75 85 74 / 20 10 10 30 STT 85 74 84 73 / 20 10 10 30

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

SHORT TERM . JA LONG TERM . CS PUBLIC DESK . LIS


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SJNP4 - 9755371 - San Juan, PR 16 mi57 min E 13 G 15 82°F 83°F1016.3 hPa
41053 - San Juan, PR 16 mi75 min ENE 14 G 16 81°F 83°F4 ft1015.2 hPa (-1.2)
41056 25 mi75 min ENE 12 G 14 80°F 82°F3 ft1015.5 hPa (-1.0)
JOXP4 - Jobos Bay Reserve, Puerto Rico 27 mi90 min E 5.1 86°F 1017 hPa70°F
ESPP4 - 9752695 - Esperanza, PR 28 mi57 min E 6 G 11
CLBP4 - 9752235 - Culebra, PR 33 mi57 min 82°F 83°F1016.1 hPa
42085 - Southeast of Ponce, PR 43 mi75 min E 12 G 14 82°F 82°F3 ft1014.7 hPa (-1.4)

Wind History for Fajardo, PR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Juan, Luis Munoz Marin International Airport, PR11 mi19 minENE 1210.00 miPartly Cloudy83°F68°F61%1015.6 hPa

Link to 5 minute data for TJSJ

Wind History from JSJ (wind in knots)
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Last 24hrNE10E10NE11E10NE9NE9NE9E7E4CalmCalmSE3SE3CalmCalmCalmCalmCalmCalmSE5E10E11E13
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1 day agoN8NE7NE8NE9NE8NE7E5E7NE9NE7NE8CalmCalmCalmCalmCalmSW3CalmS3CalmNE8E10NE10NE9
2 days agoN7N7N7N4N5N5NE3CalmS3S3CalmS3CalmN5E3CalmCalmCalmCalmSW3NW7N5N6N7

Tide / Current Tables for Boca De Cangrejos, Isla Verde, San Juan, Puerto Rico
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Boca De Cangrejos
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Mon -- 02:34 AM AST     -0.03 feet Low Tide
Mon -- 05:32 AM AST     Full Moon
Mon -- 06:39 AM AST     Sunrise
Mon -- 06:44 AM AST     Moonset
Mon -- 09:52 AM AST     1.52 feet High Tide
Mon -- 04:37 PM AST     0.43 feet Low Tide
Mon -- 05:45 PM AST     Sunset
Mon -- 06:07 PM AST     Moonrise
Mon -- 08:59 PM AST     0.74 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.1-0-00.10.30.711.31.51.51.41.210.80.60.50.40.50.60.70.70.70.6

Tide / Current Tables for Vieques Passage, Puerto Rico Current
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Vieques Passage
Click for Map
Mon -- 02:03 AM AST     -0.00 knots Slack
Mon -- 04:36 AM AST     -0.32 knots Max Ebb
Mon -- 05:32 AM AST     Full Moon
Mon -- 06:37 AM AST     Sunrise
Mon -- 06:42 AM AST     Moonset
Mon -- 06:56 AM AST     0.00 knots Slack
Mon -- 10:41 AM AST     0.73 knots Max Flood
Mon -- 01:57 PM AST     -0.00 knots Slack
Mon -- 05:37 PM AST     -0.89 knots Max Ebb
Mon -- 05:44 PM AST     Sunset
Mon -- 06:06 PM AST     Moonrise
Mon -- 09:37 PM AST     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.20-0.2-0.3-0.3-0.200.30.50.70.70.60.3-0-0.4-0.7-0.9-0.9-0.7-0.5-0.20.10.3

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
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.