Monday, November23, 2020
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Marine Weather and Tides
Isabela, 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 5:51PM Monday November 23, 2020 3:32 PM AST (19:32 UTC) Moonrise 1:58PMMoonset 1:06AM Illumination 60% Phase: Waxing Gibbous; Moon at 8 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- 304 Pm Ast Mon Nov 23 2020
Tonight..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers.
Tuesday..Northeast winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds.
Tuesday night..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Isolated showers through the night.
Wednesday..Northeast winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Scattered showers.
Wednesday night..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Isolated showers through the night.
Thursday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 8 seconds. Isolated showers.
Friday..Northeast winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 9 seconds. Isolated showers.
Saturday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Isolated showers.
AMZ700 304 Pm Ast Mon Nov 23 2020
Synopsis for puerto rico and the uS. Virgin islands waters... Moderate east-southeast winds will continue across the regional waters through at least Tuesday, gradually shifting to the east to east northeast thereafter. A northerly swell is subsiding, but choppy conditions will persist across portions of the atlantic waters and eastern local passages. Gradual improvement will continue into midweek, followed by another swell arriving by Thursday.


7 Day Forecast for Marine Location Near Isabela zona urbana, PR
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location: 18.5, -67.01     debug


Area Discussion for - San Juan, PR
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FXCA62 TJSJ 231903 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 303 PM AST Mon Nov 23 2020

SYNOPSIS. A surge in low-level moisture will promote showers moving from the waters into southern and eastern Puerto Rico, as well as the US Virgin islands through early Tuesday morning. Thereafter, a somewhat drying trend is anticipate, but patches of low-level moisture will still enhance some shower development from time-to-time. Southeast surface wind flow will continue through Tuesday morning, gradually shifting to the east northeast to northeast thereafter.

SHORT TERM. Tonight through Wednesday .

Although some low-level drier air has moved over the region from the east, a surge in low-level moisture is forecast to reach the local islands tonight into Tuesday, pulled under a southeasterly steering flow generated by surface low located to our northwest and associated surface trough now extending over Hispanola. This will result in additional shower activity across portions of southern and eastern Puerto Rico, as well as the US Virgin Islands during the overnight and early morning hours.

Winds are to weaken and gradually shift from the east northeast to northeast as the low and associated trough crosses the forecast area and moves eastward into the central Atlantic Tuesday into Wednesday. Under this flow, patches of low-level moisture are forecast to move across the region, decreasing in frequency and intensity each day. So far, model guidance suggests that precipitable water will peak around 1.95 and 1.70 inches between 15-21Z on Tuesday and Wednesday, respectively, but falling to 1.40 inches by late Tuesday night and nearly 1.00 inches by late Wednesday night. This clearly describes a rather drying pattern occurring within the short-term forecast period, resulting from a mid-to-upper level ridge forecast to move into the region, enhancing a strong trade wind inversion and the erosion of the available moisture.

Overall, the combination of sufficient moisture content along with local and diurnal effects will support afternoon convective development, but in this time favoring the interior and southwestern sections of Puerto Rico on Tuesday and Wednesday. Although some drying is expected during the overnight and early morning hours, passing showers moving from the waters into portions of northern and eastern Puerto Rico, as well as the US Virgin Islands cannot be ruled out.

LONG TERM. Thursday through Sunday .

From previous discussion. /issued 513 AM AST Mon Nov 23 2020/

A weak low pressure that has been developing north of the Bahama Islands today, will be absorbed into a strong trough moving into the Atlantic from the northern United States. That low will be followed by a moderately strong high pressure that will push the low into the central Atlantic. On Wednesday it will split into two parts, one which will continue northeast and the other which will move south southwest. Under the influence and enhanced by, a developing mid to upper level low, that surface low will settle to a position 860 miles northeast of Saint Thomas. This low pressure juxtaposed with the surface high that will remain over the western Atlantic Thursday through Sunday, will maintain northeast to east northeast flow over the local area.

During this time available moisture will be decreasing through the entire period today through Sunday. By Thursday moisture will be confined to 700 mb and by Saturday to only 800 mb, with very dry air above it all the way to the stratosphere. This will limit afternoon convection especially Friday and over the weekend. Some showers are expected along the windward slopes Thursday and Sunday mainly during the overnight and early morning hours.

Owing to the east northeast flow, temperatures along the northeast coast will moderate, while high temperatures along the southwest coast and especially around Guanica will remain in the upper 80s to near 90 degrees.

AVIATION. Mainly VFR conds expected for all terminals. Sct SHRA across northwestern PR through 23/22z will result in VCSH across TJBQ. Isolated to Sct SHRA across the Caribbean waters could move into southern PR from time to time through the period, resulting in VCSH across TJPS. No significant impacts to operations and visibilities expected at this time. Winds will continue from the ESE-SE up to 10 kts with some sea breeze variations through 23/22z, becoming light and variable overnight. /GL

MARINE. Although marine conditions have improved, choppy seas up to 6 feet are still expected across the offshore Atlantic waters and eastern local passages through Tuesday, where small craft operators are urged to exercise caution. Elsewhere, seas of 5 feet or below are expected. For beach goers, a moderate risk of rip currents remains in effect for most local beaches. Another northerly swell is expected to generate choppy to hazardous marine and coastal conditions by the end of the workweek and continue into the weekend.

PRELIMINARY POINT TEMPS/POPS. SJU 76 86 76 85 / 40 30 30 40 STT 75 86 75 86 / 30 20 40 40

SJU WATCHES/WARNINGS/ADVISORIES. PR . None. VI . None. AM . Small Craft Advisory until 2 AM AST Tuesday for Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N.



SHORT TERM . JA LONG TERM . ICP PUBLIC DESK . TW


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PTRP4 16 mi18 min SE 7 G 15 81°F
41115 - Rincon, Puerto Rico (181) 17 mi37 min 83°F3 ft
MGZP4 - 9759394 - Mayaguez, PR 21 mi45 min 80°F 84°F1012.5 hPa
MGIP4 - 9759110 - Magueyes Islands, PR 37 mi45 min SE 1.9 G 5.1 76°F 80°F1012.3 hPa
SJNP4 - 9755371 - San Juan, PR 47 mi45 min SSE 12 G 18 84°F 83°F1011.8 hPa
41053 - San Juan, PR 48 mi33 min SSE 9.7 G 14 85°F 83°F4 ft1010.4 hPa (-2.2)

Wind History for Arecibo, PR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Aquadilla, Rafael Hernandez Airport, PR6 mi43 minN 010.00 miMostly Cloudy81°F73°F79%1012.5 hPa

Link to 5 minute data for TJBQ

Wind History from JBQ (wind in knots)
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Last 24hrSE3E8E4CalmCalmCalm------------------CalmCalmCalmCalmCalmN3N5N6Calm
1 day agoE13E15CalmCalmCalmSE5Calm----------------SE4CalmE4E4W5CalmS3S4SE3
2 days agoCalmCalmNW4CalmCalmCalm------------------SE4E5E8E7SE4E10
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Tide / Current Tables for Aguadilla, Crashboat Beach, Puerto Rico
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Mayaguez, Puerto Rico
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Mayaguez
Click for Map
Mon -- 01:07 AM AST     Moonset
Mon -- 03:12 AM AST     1.10 feet High Tide
Mon -- 06:39 AM AST     Sunrise
Mon -- 09:09 AM AST     0.42 feet Low Tide
Mon -- 01:57 PM AST     Moonrise
Mon -- 03:39 PM AST     1.48 feet High Tide
Mon -- 05:50 PM AST     Sunset
Mon -- 10:23 PM AST     0.42 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.70.911.11.110.80.60.50.40.50.60.81.11.31.51.51.41.210.70.50.40.4

Weather Map
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wmap_A
GEOS Local Image of Puerto Rico    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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weather_mapweather_map weather_map


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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.