Sunday, December15, 2019
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Marine Weather and Tides
Lomas, PR

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:46AMSunset 5:51PM Sunday December 15, 2019 5:18 PM AST (21:18 UTC) Moonrise 9:23PMMoonset 9:52AM Illumination 83% Phase: Waning Gibbous; Moon at 19 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- 416 Pm Ast Sun Dec 15 2019
.small craft should exercise caution till 2am ast...
.small craft advisory in effect from 2 am ast Monday through Wednesday evening...
Tonight..East winds 15 to 20 knots. Seas 5 to 7 feet with occasional seas up to 9 feet. Dominant period 8 seconds. Isolated showers.
Monday..East winds 15 to 20 knots. Seas 6 to 8 feet with occasional seas up to 10 feet. Dominant period 8 seconds. North swell around 4 feet. Scattered showers.
Monday night..East winds 20 to 25 knots. Seas 6 to 8 feet with occasional seas up to 10 feet. Dominant period 8 seconds. Northeast swell around 4 feet. Isolated showers.
Tuesday..East winds 15 to 20 knots. Seas 6 to 8 feet with occasional seas up to 10 feet. Dominant period 8 seconds. Northeast swell around 4 feet. Isolated showers.
Tuesday night..East winds 15 to 20 knots. Seas 6 to 8 feet with occasional seas up to 10 feet. Dominant period 9 seconds. Northeast swell around 4 feet. Isolated showers.
Wednesday..East winds 15 to 20 knots. Seas 6 to 8 feet with occasional seas up to 10 feet. Dominant period 9 seconds. Northeast swell around 4 feet. Isolated showers.
Thursday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 9 seconds. Scattered showers.
Friday..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Isolated showers.
AMZ700 416 Pm Ast Sun Dec 15 2019
Synopsis for puerto rico and the uS. Virgin islands waters... Moderate east northeast winds will continue across the local waters this evening, due to a strong ridge located over the north central atlantic. Winds will increase early Monday and persist into midweek causing hazardous seas to return to a broader area. Isolated to scattered trade wind showers with gusty winds are also expected.


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 151748 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 148 PM AST Sun Dec 15 2019

SYNOPSIS. Winds will pick up again by Monday, creating hazardous marine conditions across the local waters once again. The wind flow will also shift from the east-northeast, favoring passing showers across the northern and eastern coast of Puerto Rico and over the U.S. Virgin Islands.

SHORT TERM. Tonight through Tuesday .

As a low to mid level ridge over northwest of the islands strengthen, winds will pick up once again and shift from the east-northeast by tonight. This change in the wind direction should favor passing shower activity along the northern and eastern coast of Puerto Rico as well as over the U.S. Virgin Islands. However, the latest GOES 16 Total Precipitable Water product shows an area of lower moisture content approaching the islands. This should result in less frequent activity than what has been observed during the past few days, at least for the nighttime and early hours on Monday. As the high migrates toward the east on Tuesday, winds will shift out of the east to east- southeast. Since the pressure gradient will still be tighten, strong winds are expected to persist through midweek.

LONG TERM. Wednesday through Monday .

The large zonal ridge continues to influence conditions over the local islands on Wednesday. As it is forecast to be pulling away from the area, moving to the east, winds over the local area will veer slightly to out of the SE, while also diminishing somewhat through the day and into Thursday. A dry slot will push through the area on Wednesday into early Thursday; combined with unfavorable conditions aloft, this will act to inhibit somewhat shower activity over the local islands. Brief passing showers are still anticipated, as well as afternoon showers due to local effects and diurnal heating. Patches of moisture carried in on the trade winds will begin filtering into the area on Thursday, associated with the passage to our south of a developing disturbance. These patches of moisture will continue passing over the area into Friday, and an increase in shower activity is likely. Another small dry slot is anticipated for late Friday into Saturday, again associated with a decrease in - but not an elimination of - shower activity across the forecast area.

On Saturday, an inverted trough is expected to develop over the western Caribbean, stretching northward to off the coast of the Carolinas by Saturday afternoon. Beyond this point, there is increasing uncertainty in the synoptic pattern. This trough will slowly approach the area from the west during the day on Sunday, and begin sweeping through on Monday. Cyclogenesis of some kind is likely in the western Atlantic, off the coast of the United States, within this trough; the location, timing, and intensity are uncertain, though, at this time. Both the ECMWF and the GFS now show some notable development of a low, with a front that would extend southward enough to impact the local islands. Today, it is the ECMWF that is more bullish with the development and intensification of this low, showing very rapid cyclogenesis, while the GFS solution suggests a somewhat more modest intensification, taking place further south. Given that this is all a week out, and the lack of good consensus from the models, or even good consistency between runs, there remain plenty of reasons to be skeptical of this theoretical future low, especially in terms of its intensity or the potential for explosive cyclogenesis. All of this to say that, presently, it looks likely that there will be a trough to our west on Sunday that will pass over the area on Monday, though there is uncertainty in the magnitude of the impacts. A more southerly flow is therefore likely Sunday into Monday, with a northwesterly flow behind the trough. Increased shower activity is likely for Sunday and especially Monday, and with winds out of the south on those days, the most affected areas will be southern Puerto Rico during the overnight and morning, and northern Puerto Rico during the afternoon.

Aviation. Prevailing VFR conds expected across the local terminals. VCSH expected as isolated scattered showers are expected across the area through the forecast period. TEMPO SHRA possible at TJBQ after 15/20Z, but any impact would be minimal. Winds from the E-ESE at 10- 15KT with occasional gusts and sea breeze variations at TJPS through 15/22Z. Winds decreasing overnight, bout will increase once again to around 15KT with gusts after 16/13Z, remaining easterly.

MARINE. Except for the offshore Atlantic waters, seas have decreased below small craft advisory criteria. However, by Monday morning, winds will start to pick up again, creating hazardous seas along most of the local waters. Seas up to 7 feet are expected for tomorrow, where small craft advisories will be in effect. For the beachgoers, there is a high rip current risk for the northern coast of Puerto Rico, Culebra and St. Croix.

PRELIMINARY POINT TEMPS/POPS. SJU 75 85 74 85 / 50 50 40 50 STT 76 86 76 85 / 50 50 50 50

SJU WATCHES/WARNINGS/ADVISORIES. PR . High Rip Current Risk through Wednesday afternoon for North Central-Northeast-Northwest-San Juan and Vicinity-Southeast.

High Rip Current Risk through late tonight for Culebra.

VI . High Rip Current Risk through Wednesday afternoon for St Croix.

AM . Small Craft Advisory from 8 AM Monday to 8 PM AST Wednesday for Anegada Passage Southward to 17N-Caribbean Waters of Puerto Rico from 10 NM to 17N-Coastal Waters of Northern Puerto Rico out 10 NM-Coastal Waters of Northern USVI and Culebra out 10 NM-Coastal Waters of Southern USVI Vieques and Eastern Puerto Rico out 10 NM-Mona Passage Southward to 17N.

Small Craft Advisory until 8 PM AST Wednesday for Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N.



SHORT TERM . JA LONG TERM . ERG PUBLIC DESK . FRG


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
41053 - San Juan, PR 16 mi79 min E 16 G 19 83°F 84°F6 ft1015 hPa (-0.0)
SJNP4 - 9755371 - San Juan, PR 16 mi49 min E 14 G 15 84°F 83°F1016.1 hPa
YABP4 - 9754228 - Yabucoa Harbor, PR 16 mi49 min 85°F 74°F
41056 25 mi79 min E 12 G 16 82°F 82°F4 ft1015 hPa (-0.3)
JOXP4 - Jobos Bay Reserve, Puerto Rico 27 mi94 min E 2.9 84°F 1017 hPa76°F
ESPP4 - 9752695 - Esperanza, PR 28 mi49 min ESE 9.9 G 14 85°F 82°F1016.5 hPa
CLBP4 - 9752235 - Culebra, PR 33 mi55 min 84°F 83°F1016.4 hPa
42085 - Southeast of Ponce, PR 43 mi79 min ENE 12 G 14 82°F 82°F4 ft1014.5 hPa (-0.9)
AROP4 - 9757809 - Arecibo, PR 43 mi49 min NE 8 G 14

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 mi83 minE 1410.00 miPartly Cloudy86°F73°F66%1016.3 hPa

Link to 5 minute data for TJSJ

Wind History from JSJ (wind in knots)
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Last 24hrSE6SE5E4E5SE3E5E5CalmSE4CalmE13S3CalmE8E8E9E12E10E12E10
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1 day agoE7E7SE3SE5SE6SE5S3SE4CalmSE4SE3SE4SE4CalmE6E13E10E12E16E11E11E5E10E10
2 days agoE16E13E15
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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 -- 04:41 AM AST     -0.15 feet Low Tide
Sun -- 06:47 AM AST     Sunrise
Sun -- 09:52 AM AST     Moonset
Sun -- 12:07 PM AST     1.60 feet High Tide
Sun -- 05:49 PM AST     Sunset
Sun -- 06:52 PM AST     0.42 feet Low Tide
Sun -- 09:22 PM AST     Moonrise
Sun -- 11:23 PM AST     0.78 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.50.20-0.1-0.1-00.20.60.91.31.51.61.51.41.10.80.60.50.40.50.60.70.8

Tide / Current Tables for Vieques Passage, Puerto Rico Current
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Vieques Passage
Click for Map
Sun -- 01:32 AM AST     0.52 knots Max Flood
Sun -- 04:29 AM AST     -0.00 knots Slack
Sun -- 06:45 AM AST     Sunrise
Sun -- 07:04 AM AST     -0.41 knots Max Ebb
Sun -- 09:31 AM AST     0.00 knots Slack
Sun -- 09:50 AM AST     Moonset
Sun -- 01:03 PM AST     0.77 knots Max Flood
Sun -- 04:12 PM AST     -0.00 knots Slack
Sun -- 05:48 PM AST     Sunset
Sun -- 07:48 PM AST     -0.97 knots Max Ebb
Sun -- 09:21 PM AST     Moonrise
Sun -- 11:32 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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0.30.50.50.40.1-0.1-0.3-0.4-0.3-0.10.10.40.70.80.70.40.1-0.3-0.7-0.9-1-0.8-0.6-0.2

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 (16,3,4,5)
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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 numerious 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.