Sunday, January17, 2021
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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 6:57AMSunset 6:10PM Sunday January 17, 2021 8:36 PM AST (00:36 UTC) Moonrise 10:22AMMoonset 10:24PM Illumination 21% Phase: Waxing Crescent; Moon at 5 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- 403 Pm Ast Sun Jan 17 2021
Tonight..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Scattered showers.
Monday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. North swell around 4 feet in the afternoon. Isolated showers through the day.
Monday night..East winds 10 to 15 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 11 seconds. North swell 4 to 5 feet. Scattered showers.
Tuesday..East winds 10 to 15 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 13 seconds. North swell 4 to 5 feet. Isolated showers.
Tuesday night..East winds 10 to 15 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 12 seconds. North swell 4 to 5 feet. Scattered showers.
Wednesday..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.
Thursday..East winds 5 to 10 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 8 seconds. Scattered showers.
Friday..East winds 5 to 10 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 11 seconds. North swell around 4 feet. Isolated showers.
AMZ700 403 Pm Ast Sun Jan 17 2021
Synopsis for puerto rico and the uS. Virgin islands waters... Moderate to locally fresh easterly trade winds will continue across the local waters for the next couple of days. Seas of 5 feet or less continue tonight, but a northerly swell is forecast to affect the atlantic waters and local passages Monday into Tuesday, resulting in choppy seas. Isolated to scattered brief showers will be possible from time to time through the next several days.


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 171958 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 358 PM AST Sun Jan 17 2021

SYNOPSIS.

Isolated to scattered showers continue into tonight. Dry air with patches of low-level moisture will bring generally fair weather over the next several days; isolated to scattered showers are possible under the influence of moisture patches, and there is the potential for isolated showers otherwise. For the local waters, seas of 5 feet or less continue for much of the local waters into tomorrow. A northerly swell will lead to building seas, though, starting with the offshore Atlantic waters tomorrow. A Small Craft Advisory is in effect tomorrow evening into Wednesday morning for the offshore Atlantic waters.

SHORT TERM. Tonight through Tuesday .

Patchy moisture continues to stream over the area from time to time. However, even when these patches are over the region, there remains a strong capping inversion in the lower mid-levels. This dry, stable air aloft will inhibit shower development. Model guidance suggests that the current moisture patch will continue to impact the region tonight, decreasing into the morning. Isolated to scattered showers are expected when the patches of moisture are affecting the region. Otherwise, isolated showers are possible, but generally fair weather is expected. The areas most likely to be affected by showers will be the USVI and eastern Puerto Rico.

LONG TERM. Wednesday through Sunday . From Prev Discussion .

No change in the overall synoptic pattern is expected during the long term period. Mid-level ridge will continue to hold across the area, resulting in very dry air and stable conditions aloft. Therefore, fair weather conditions are expected to prevail through period. However, as it is typical during this time of the year, patches of low-level moisture riding the easterly trade wind flow will move across the area from time to time. This will result in areas of isolated to scattered showers, with activity across portions of eastern Puerto Rico and the USVI mainly during the overnight and early morning hours followed by some activity across western Puerto Rico during the afternoon hours. In general, any activity is expected to be light to moderate in intensity and brief, resulting in light rainfall accumulations for the most part.

AVIATION.

Prevailing VFR conds expected for the next 24 hours, with brief periods of MVFR CIGS possible. East winds at 10 - 15 KT with occasional gusts and sea breeze variations through 17/22Z, becoming lighter thereafter. VCSH is expected across the local terminals later this afternoon and tonight. Cloudiness moving in can cause brief moments of MVFR Ceilings but generally VFR conds are expected. Wx to improve after 18/10Z allowing for less cloud cover and fewer -SHRA.

MARINE.

Seas of up to 5 feet persist today, and into tomorrow for most of the local waters. A northerly swell is forecast to arrive later tonight, leading to building seas for the local Atlantic waters and Anegada Passage. Seas of up to 6 feet are expected for nearshore Atlantic waters and the Anegada Passage Monday night, with seas of up to around 7 feet for the offshore Atlantic waters. With seas of around 7 feet anticipated for the local offshore Atlantic waters, there is a Small Craft Advisory in effect, beginning at 8 PM AST on Monday and lasting until 8 AM AST on Wednesday. Seas of around 7 feet are most likely in eastern portions of the zone.

For the beachgoers, there is a moderate risk of rip currents for many beaches of northern Puerto Rico, eastern Culebra, and eastern St. Croix.

PRELIMINARY POINT TEMPS/POPS. SJU 74 85 74 84 / 50 20 30 50 STT 73 84 74 84 / 50 20 30 50

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



SHORT TERM . WS LONG TERM . CRS PUBLIC DESK . ICP


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SJNP4 - 9755371 - San Juan, PR 16 mi49 min E 9.9 G 13 76°F 81°F1016.4 hPa
41053 - San Juan, PR 16 mi37 min E 7.8 G 9.7 75°F 81°F2 ft1015.4 hPa (+1.6)
41056 25 mi37 min E 12 G 14 79°F 80°F3 ft
JOXP4 - Jobos Bay Reserve, Puerto Rico 27 mi52 min E 1.9 77°F 1017 hPa69°F
ESPP4 - 9752695 - Esperanza, PR 28 mi49 min NE 2.9 G 4.1 81°F1016.4 hPa
CLBP4 - 9752235 - Culebra, PR 33 mi49 min 76°F 81°F1016.2 hPa
42085 - Southeast of Ponce, PR 43 mi37 min E 14 G 18 80°F 81°F3 ft1014.8 hPa (+1.8)

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 mi41 minENE 610.00 miMostly Cloudy75°F73°F94%1016.4 hPa

Link to 5 minute data for TJSJ

Wind History from JSJ (wind in knots)
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Last 24hrE5E3SE3SE3CalmCalmCalmCalmCalmCalmCalmCalmCalmE8E11E5SE5NE6NE13NE12E11E5E6E6
1 day agoE5E5E3CalmCalmE3CalmCalmCalmS3CalmCalmE7E10E8E11NE14NE11E13E14E13NE9E9E6
2 days agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmE5E5N8NE9NE12NE11E11E12E10E8E4

Tide / Current Tables for Boca De Cangrejos, Isla Verde, San Juan, Puerto Rico
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Boca De Cangrejos
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Sun -- 05:56 AM AST     0.09 feet Low Tide
Sun -- 06:59 AM AST     Sunrise
Sun -- 10:23 AM AST     Moonrise
Sun -- 12:42 PM AST     1.33 feet High Tide
Sun -- 06:09 PM AST     Sunset
Sun -- 07:10 PM AST     0.27 feet Low Tide
Sun -- 10:24 PM AST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.90.90.70.50.30.10.10.20.30.60.91.11.31.31.210.80.50.40.30.30.40.60.8

Tide / Current Tables for Vieques Passage, Puerto Rico Current
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Vieques Passage
Click for Map
Sun -- 02:21 AM AST     0.64 knots Max Flood
Sun -- 05:35 AM AST     -0.00 knots Slack
Sun -- 06:57 AM AST     Sunrise
Sun -- 08:21 AM AST     -0.48 knots Max Ebb
Sun -- 10:21 AM AST     Moonrise
Sun -- 11:11 AM AST     0.00 knots Slack
Sun -- 02:09 PM AST     0.53 knots Max Flood
Sun -- 04:58 PM AST     -0.00 knots Slack
Sun -- 06:08 PM AST     Sunset
Sun -- 08:30 PM AST     -0.78 knots Max Ebb
Sun -- 10:22 PM AST     Moonset
Sun -- 11:56 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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0.20.50.60.60.40.2-0.1-0.4-0.5-0.4-0.3-00.20.40.50.50.3-0-0.3-0.6-0.8-0.8-0.6-0.3

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




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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.