Monday, December9, 2019
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Marine Weather and Tides
Culebra, 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 6:39AMSunset 5:45PM Monday December 9, 2019 9:46 AM AST (13:46 UTC) Moonrise 3:58PMMoonset 4:08AM Illumination 94% Phase: Waxing Gibbous; Moon at 13 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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AMZ725 Coastal Waters Of Southern Usvi Vieques And Eastern Puerto Rico Out 10 Nm- 403 Am Ast Mon Dec 9 2019
.small craft should exercise caution...
Today..East winds 10 to 15 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 8 seconds. Scattered showers.
Tonight..East winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 8 seconds. Numerous showers.
Tuesday..East winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 7 seconds. Scattered showers.
Tuesday night..East winds 15 to 20 knots. Seas 5 to 7 feet with occasional seas up to 9 feet. Dominant period 7 seconds. Northeast swell around 4 feet after midnight. Scattered showers.
Wednesday..East winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 8 seconds. East swell around 4 feet. Scattered showers.
Thursday..East winds 15 to 20 knots. Seas 5 to 7 feet with occasional seas up to 9 feet. Dominant period 10 seconds. Northeast swell around 4 feet. Scattered showers.
Friday..East winds 15 to 20 knots. Seas 5 to 7 feet with occasional seas up to 9 feet. Dominant period 10 seconds. Northeast swell around 4 feet. Scattered showers.
AMZ700 403 Am Ast Mon Dec 9 2019
Synopsis for puerto rico and the uS. Virgin islands waters... Moderate easterly winds continue across the local waters, resulting in choppy seas. Higher seas are expected beginning today due to the stronger than normal trade winds caused by a strong atlantic high pressure. Hazardous marine conditions are forecast for portions of the local waters starting tonight and lasting through the week and into next weekend. Isolated to scattered showers can be expected across the region for the next few days.


7 Day Forecast for Marine Location Near Culebra, PR
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location: 18.02, -64.67     debug


Area Discussion for - San Juan, PR
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FXCA62 TJSJ 090846 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 446 AM AST Mon Dec 9 2019

SYNOPSIS.

The threat for isolated to scattered showers continues across the region, but a few factors will minimize the threat for urban and small stream flooding. Though some localized flooding is possible, decent low level wind flow will keep the showers moving, and unfavorable atmospheric conditions will limit the strength of the showers. No major weather systems are expected for the next week. However, a strong Atlantic high pressure system will drive breezy easterly winds and rough seas.

SHORT TERM. Today through Wednesday .

An approaching upper level trough will usher in a westerly jet up to 55 knots Monday night through early Tuesday morning. At mid levels, a cold pool accompanying the upper level trough will approach the area and pass to our northeast, but not without bringing 500 mb temperatures of minus 9 degrees to the area on Tuesday. This will also be the time when the driest mid level air will be encountered. At the surface, high pressure north of the area near 40 north this morning will strengthen to as much as 1044 mb in the central Atlantic by Tuesday morning. This will increase the local pressure gradient and also the east northeast winds in the lower levels. Surface winds over the local waters will increase to 15 to 20 knots and continue through beyond Wednesday. Bands of moisture are interspersed in this flow over the western tropical Atlantic with areas of drier air between. One of those bands moved across the U.S. Virgin Islands overnight and is entering Puerto Rico this morning. Shower activity is expected to increase from levels seen yesterday. Because of the stronger winds, showers will be more significant over the windward slopes of Puerto Rico even during the typically drier daytime hours. Weak mid level moisture along with rapidly moving showers will considerably limit amounts of rain received during the period but amounts up to an inch are possible. Temperatures at 500 mb are expected to fall to minus 8 this afternoon and so thunderstorms cannot be ruled out in central and western Puerto Rico, while drier mid levels may inhibit deep convection on Tuesday.

LONG TERM. Thursday through Tuesday

Uneventful weather conditions are expected to prevail in the longterm forecast. Near average moisture will be with us, with precipitable water values mostly between 1.5 and 1.7 inches. Also, trade winds stay fairly brisk as well, helping to keep showers moving along and reducing the amount of rainfall accumulations. No major fronts or tropical waves are forecasted for the next week. Furthermore, the upper levels of the atmosphere remain less conducive to thunderstorm activity with plenty of ridging aloft.

Despite the generally average conditions in the long-term, there will still be plenty of opportunity for passing showers. Advective showers will develop in the nighttime and morning hours, threatening the east coast of Puerto Rico and the USVI, particularly Thursday and Friday when the highest moisture content will occur. Furthermore, the usual afternoon shower activity is possible, particularly for western Puerto Rico. However, for reasons mentioned in the last paragraph, these showers will likely have minimal impact. Long range models suggest drier conditions heading into the next week, with the chance for some Saharan dust working into the region. However, there is minimal confidence in that forecast this far out.

AVIATION.

VFR conditions are expected to prevail across all terminals. Sct SHRA will develop in SW PR aft 08/17Z with highest trrn obscured. Isold TSRA psbl. Brief MVFR may be seen in TJMZ. Sfc winds ENE 5-15 kt with sea breeze influences and gusts to 25 kt. Max winds W increasing to 50-65 kt btwn FL380-510--highest near FL460.

MARINE.

The easterly trade winds are increasing as expected, due to a strong area of high pressure developing in the Atlantic. Seas will become choppy and hazardous, with Small Craft Advisory conditions beginning later this evening and lasting at least into Friday. Isolated to scattered showers are possible across local waters, with only a small threat for thunderstorms.

PRELIMINARY POINT TEMPS/POPS. SJU 85 75 84 76 / 50 50 70 70 STT 85 75 86 75 / 40 40 40 40

SJU WATCHES/WARNINGS/ADVISORIES. PR . None. VI . None. AM . Small Craft Advisory from 8 PM this evening to 8 AM AST Friday for Anegada Passage Southward to 17N-Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N-Caribbean Waters of Puerto Rico from 10 NM to 17N-Mona Passage Southward to 17N.



SHORT TERM . WS LONG TERM . mb PUBLIC DESK . 99


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
41052 - South of St. John, Virgin Islands 17 mi46 min E 18 G 19 83°F 83°F4 ft1016.5 hPa (+2.0)
CHSV3 - 9751364 - Christiansted Harbor, Virgin Islands 19 mi52 min NE 8 G 16 83°F 82°F1017.2 hPa
LAMV3 21 mi46 min 82°F 83°F
LTBV3 - 9751401 - Lime Tree Bay, VI 23 mi46 min ESE 15 G 19 83°F 83°F1017.6 hPa (+2.0)
CHAV3 - 9751639 - Charlotte Amalie, VI 25 mi52 min 80°F 1017.7 hPa
CLBP4 - 9752235 - Culebra, PR 39 mi52 min 82°F 84°F1017.8 hPa
ESPP4 - 9752695 - Esperanza, PR 43 mi46 min E 6 G 9.9 85°F 82°F1018.1 hPa (+2.2)
41056 45 mi46 min E 14 G 16 82°F 83°F3 ft1016.8 hPa (+2.2)

Wind History for Christiansted Harbor, St Croix, VI
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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Click EDIT to select an airport
Tide / Current Tables for Christiansted Harbor, St Croix, Virgin Islands
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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 Benner Bay, St. Thomas, Virgin Islands
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Benner Bay
Click for Map
Mon -- 04:09 AM AST     Moonset
Mon -- 06:39 AM AST     Sunrise
Mon -- 08:09 AM AST     0.83 feet High Tide
Mon -- 03:58 PM AST     Moonrise
Mon -- 05:43 PM AST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.10.20.30.40.60.70.80.80.80.80.70.60.50.40.40.40.40.30.30.20.20.10

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
Wind Forecast for (8,2,3,4)
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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.