Saturday, November28, 2020
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Marine Weather and Tides
Culebra, 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 6:32AMSunset 5:42PM Saturday November 28, 2020 1:18 PM AST (17:18 UTC) Moonrise 4:40PMMoonset 4:56AM Illumination 97% 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- 1139 Am Ast Sat Nov 28 2020
Rest of today..Southeast winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Isolated showers.
Tonight..Northeast winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Isolated showers.
Sunday..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Isolated showers.
Sunday 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.
Monday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. Isolated showers.
Tuesday..East winds 5 to 10 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. Scattered showers.
Wednesday..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 1139 Am Ast Sat Nov 28 2020
Synopsis for puerto rico and the uS. Virgin islands waters... Choppy seas up to 6 feet are expected the rest of today, then below 5 feet on Sunday and for the next several days thereafter. Gentle to moderate east-northeast winds will continue across the regional waters for the next several days. Isolated to scattered showers are expected over the waters for the next several 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 281552 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 1152 AM AST Sat Nov 28 2020

UPDATE. Very minor changes were made to the forecast, but the main impact is still the same. Isolated to scattered showers are expected across the local Atlantic waters for the next few hours. However, Puerto Rico and the USVI should remain fairly dry, that said, the latest model guidance suggests that some rain could occur this afternoon across the interior to western and northwestern sections of PR, but the accumulations are not expected to cause significant hazards. Relatively dry air is still expected for the rest of the weekend, so any showers that does develop is expected to be rather brief and or light.

AVIATION. VFR conds expected across the local terminals. Some cloudiness could cause MVFR CIGs at TJBQ . VCSH in the forecast as light SHRA affects the local area. Winds are light from the NE with sea breeze variations.

MARINE. Seas up to 6 feet expected today across the Atlantic, and up to 5 ft elsewhere. Seas to subside tonight, and up to 5 ft seas are expected then and for the next few days. High risk of rip currents until 6pm this afternoon across northern PR.

PREV DISCUSSION. /issued 725 AM AST Sat Nov 28 2020/

SYNOPSIS . A mid-level ridge will continue to influence the local weather conditions through next week. East to northeast trade winds will bring areas of shallow moisture from the Atlantic waters, resulting in passing showers at times across the northern areas of PR and the USVI, followed by limited afternoon shower development over portions of the interior and west/southwest of PR. Seas will improve by Sunday and remain relative tranquil through next week.

SHORT TERM . Today through Monday .

A dry, stable air mass and ridging aloft will promote fair weather for Puerto Rico and the U.S. Virgin Islands through the short-term period. Deep convection is not forecast to develop during the period, due to the mid-level ridge creating subsidence in the atmospheric mid-levels, lack of significant synoptic features, and shallow moisture.

GOES-16 total precipitable water shows a slender patch of moisture just north of Puerto Rico this morning. East to northeast wind flow will pull the moisture across northern coastal areas of Puerto Rico, producing isolated to scattered showers through the morning hours.

This afternoon high resolutions models shift the isolated to scattered showers across portions of the interior and northern areas of Puerto Rico; the convection will develop due to local effects and diurnal heating.

Sunday and Monday, a drier air mass is forecast to advect into the region from the east-northeast and influence the local weather. Guidance shows precipitable water falling throughout the day on Sunday, and bottoming out at 0.7 inches Monday morning, which is far below average for this time of year. Nevertheless, a few isolated showers are possible during the afternoon due to local effects.

LONG TERM . Tuesday through Saturday .

The mid-level ridge is forecast to meander just west of the area through the long term period. This will continue to promote drier air and stable conditions aloft. At low-levels, a broad area of low pressure northeast of the region is forecast to merge with a frontal system by midweek. This and a weak surface high behind the front will continue to promote east to northeast trades across the region. Shallow areas of moisture embedded in this northeasterly wind flow will reach the islands from time to time, causing light passing showers at night across the northern sections of PR and the USVI, followed by limited afternoon shower development over portions of the Cordillera and southern PR. This weather pattern is expected to hold through the end of the week. By Saturday, an upper level low is forecast to develop northeast of the region, weakening the pressure gradient and promoting somewhat more unstable conditions during the weekend.

AVIATION . VFR conds expected across the local terminals. VCSH ARE possible across terminal sites possible across terminals TJSJ and TJBQ through 28/15Z. SRHA will continue ovr ATL waters. This afternoon vcsh/shra will develop across terminals TJSJ and TJBQ starting at 28/16Z and ending by 29/01Z. Winds will remain from the E-NE at around 10 KT through the afternoon with sea breeze variations.

MARINE . Choppy seas up to 6 feet will continue today across the Atlantic waters and portions of the local passages. Therefore, small crafts should exercise caution across these waters. Elsewhere, seas will range in general from 3 to 5 feet. East- northeast trades up to 15 knots are expected. There is a high risk of rip currents across the northern beaches of Puerto Rico.

PRELIMINARY POINT TEMPS/POPS. SJU 85 75 85 72 / 50 20 20 10 STT 85 73 85 74 / 40 10 20 10

SJU WATCHES/WARNINGS/ADVISORIES. PR . High Rip Current Risk until 6 PM AST this evening for North Central-Northeast-Northwest-San Juan and Vicinity-Southeast.

VI . None. AM . None.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
41052 - South of St. John, Virgin Islands 17 mi79 min E 5.8 G 7.8 82°F 83°F2 ft1013.6 hPa (-0.5)
CHSV3 - 9751364 - Christiansted Harbor, Virgin Islands 19 mi49 min NE 4.1 G 7 82°F 83°F1014.4 hPa
LAMV3 21 mi49 min 81°F 84°F
LTBV3 - 9751401 - Lime Tree Bay, VI 23 mi49 min SSE 5.1 G 7 84°F 83°F1015.5 hPa
CHAV3 - 9751639 - Charlotte Amalie, VI 25 mi49 min 81°F 1014.7 hPa
CLBP4 - 9752235 - Culebra, PR 39 mi49 min 87°F 83°F1014.6 hPa
ESPP4 - 9752695 - Esperanza, PR 43 mi49 min ESE 5.1 G 8 82°F1015.2 hPa
41056 45 mi79 min E 3.9 G 5.8 81°F 83°F4 ft1014.3 hPa (+0.0)

Wind History for Christiansted Harbor, St Croix, VI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Juan, Luis Munoz Marin International Airport, PR76 mi23 minNNW 710.00 miPartly Cloudy81°F73°F77%1014.5 hPa

Link to 5 minute data for TJSJ

Wind History from JSJ (wind in knots)
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Last 24hrN7N7N7N4N5N5NE3CalmS3S3CalmS3CalmN5E3CalmCalmCalmCalmSW3NW7N5N6N7
1 day agoNE11NE10E11NE11E7E5E6CalmCalmCalmCalmCalmCalmSW3CalmCalmCalmCalmCalmCalmN5N4NE8N8
2 days agoN8N8NE9NE8E6E6NE4NE4CalmCalmCalmE5CalmCalmCalmCalmCalmCalmCalmCalm6NE7E10NE10

Tide / Current Tables for Christiansted, St. Croix Island, Virgin Islands
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Christiansted
Click for Map
Sat -- 04:56 AM AST     Moonset
Sat -- 06:31 AM AST     Sunrise
Sat -- 07:08 AM AST     0.80 feet High Tide
Sat -- 12:05 PM AST     0.65 feet Low Tide
Sat -- 04:06 PM AST     0.71 feet High Tide
Sat -- 04:40 PM AST     Moonrise
Sat -- 05:41 PM AST     Sunset
Sat -- 11:43 PM AST     -0.03 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.10.20.40.50.70.80.80.80.70.70.70.70.70.70.70.70.70.60.50.40.20.1-0

Tide / Current Tables for St. Croix, Lime Tree Bay, Virgin Islands
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St. Croix
Click for Map
Sat -- 04:56 AM AST     Moonset
Sat -- 06:32 AM AST     Sunrise
Sat -- 09:27 AM AST     0.80 feet High Tide
Sat -- 04:40 PM AST     Moonrise
Sat -- 05:42 PM AST     Sunset
Sat -- 11:37 PM AST     0.03 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.20.30.30.50.60.70.70.80.80.80.80.70.70.70.60.50.50.40.30.20.10.10

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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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.