Friday, April3, 2020
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Marine Weather and Tides
Luis M. Cintrón, PR

Version 3.4
NOTICE
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 6:13AMSunset 6:37PM Friday April 3, 2020 12:47 AM AST (04:47 UTC) Moonrise 2:14PMMoonset 2:44AM Illumination 76% Phase: Waxing Gibbous; Moon at 10 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- 902 Pm Ast Thu Apr 2 2020
Rest of tonight..Southeast winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 10 seconds. Isolated showers.
Friday..South winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 11 seconds. Scattered showers.
Friday night..Southwest winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 12 seconds. East swell around 4 feet after midnight. Isolated showers.
Saturday..Southwest winds 5 to 10 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 12 seconds. East swell around 4 feet. Scattered showers.
Saturday night..West winds 5 to 10 knots veering north after midnight. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 12 seconds. East swell around 4 feet. Isolated showers.
Sunday..Northeast winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 12 seconds. East swell 4 to 5 feet. Scattered showers.
Monday..Northeast winds 5 to 10 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 11 seconds. East swell 4 to 5 feet. Scattered showers.
Tuesday..Northeast winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 11 seconds. East swell around 4 feet. Scattered showers.
AMZ700 902 Pm Ast Thu Apr 2 2020
Synopsis for puerto rico and the uS. Virgin islands waters... Tranquil marine conditions will continue across the regional waters with seas at 4 feet or less and limited shower activity across the area. Marine conditions are expected to deteriorate as a northerly swell invades the atlantic waters and local waters by Friday evening and into the weekend. Shower activity will pick up as a cold front moves into the area this weekend.


7 Day Forecast for Marine Location Near Luis M. Cintr�n, PR
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location: 18.32, -65.64     debug


Area Discussion for - San Juan, PR
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FXCA62 TJSJ 030349 CCA AFDSJU

Area Forecast Discussion . CORRECTED National Weather Service San Juan PR 1149 PM AST Thu Apr 2 2020

UPDATE. Fair weather conditions prevailed across the forecast area with only a few showers observed over sections of northwestern puerto Rico in the afternoon hours. For the overnight hours, a dry and quiet weather pattern will continue across the region. However, some brief showers are still possible over the local waters. For tomorrow, some passing showers are expected for eastern sections of Puerto Rico and the U.S. Virgin Islands. In the afternoon hours, the showers are expected to develop over sections of north central and interior sections of the island. Low temperatures in the night hours will range between the low to mid 70s across coastal areas, and low to mid 60s across higher elevations. Above- normal daytime high temperatures are expected once again on Friday afternoon due to a southeasterly wind flow.

AVIATION. Mainly VFR conditions expected across the local terminals during the next 24 hours. Winds will be light and variable through 03/12Z, increasing to between 7 to 10 knots and favoring a southeasterly flow with sea breeze variations thereafter.

MARINE. Fairly tranquil marine conditions with seas between 1 and 4 feet will prevail across the regional waters through at least Friday afternoon. A northerly swell is expected to invade the local Atlantic waters and will cause marine conditions to deteriorate by Friday evening into the weekend. Therefore, a Small Craft Advisory is in effect for the offshore Atlantic waters Friday evening through Sunday evening. There is a moderate risk of rip currents for beaches along the north coast of Puerto Rico and Culebra. The risk will elevate to high by Friday morning for beaches along the north central coast of Puerto Rico, and by Friday evening for the remaining beaches along the north, east and the northern half of the west coast of Puerto Rico.

PREV DISCUSSION. /issued 419 PM AST Thu Apr 2 2020/

SYNOPSIS . Fair and dry weather conditions will dominate the local area through at least Friday, before a frontal boundary approach the area and increase the potential for shower activity during the weekend into early next week. Warmer temperatures expected through at least Saturday under a southeasterly wind flow. Marine conditions are expected to deteriorate by Friday evening into the weekend with the arrival of a northerly swell.

SHORT TERM . Tonight through Saturday .

For tonight, an area of showers across the eastern Caribbean Sea should reach portions of St. Croix and southern Puerto Rico through Friday morning. Minor rainfall accumulations are anticipated with this activity. During the afternoon hours, this surge in moisture and a south to southwesterly steering wind flow will aid in the development of afternoon showers over portions of the interior and northern Puerto Rico. Hi-res models continue to suggest mostly minor to moderate rainfall amounts.

Meanwhile, a broad surface low over the northwestern Atlantic is supporting a cold front that is currently moving across eastern Cuba. The surface low is expected to sink southwards on Saturday and move into the central Atlantic by Sunday, this will bring the front to our area later in the weekend and create light and variable winds by late Friday night and through the short term period. An upper level jet will provide divergence aloft on Saturday and as the front moves over the local Atlantic waters, shower activity will continue through Saturday night across the northern half of Puerto Rico and the northern USVI.

LONG TERM . Sunday through Friday .

FROM PREV DISCUSSION . /issued 436 AM AST Thu Apr 2 2020/

A long-wave mid to upper level trough will continue to be the dominant weather feature across the western Atlantic early in the forecast period, while it will begin to move away, toward the central Atlantic by mid-week. At the surface on Sunday and Monday, a frontal boundary near the area and a surface high pressure over the eastern Atlantic will result in an area of low level convergence that will drag moisture into the islands. Precipitable water values are expected to range between 1.3 to 1.5 inches these days. Additionally, at the upper levels, a piece of the jet stream will be located north of the islands, hence increasing somewhat instability aloft. That said, conditions appear to be more conducive for an increase in showers across the islands. Under a light wind flow across the islands, this activity could be slow-moving, and might result in urban and small stream flooding across the area.

By the latter part of the long-term forecast period, as the long- wave trough moves toward the Central Atlantic, conditions are expected to become less favorable for any significant rainfall activity to occur. However, at the lower levels, moisture and low level convergence remains. Therefore, groups of showers may affect the area early in the morning hours across the coastal areas, while in the afternoon, supported by diurnal effects, additional showers may develop as well.

AVIATION . VFR conditions will continue to prevail at most terminals today, with the only exception being TJMZ/TJBQ where enhanced cloudiness and VCSH have been observed and will continue till 23z. Overall winds will be out of the SE at 5-10 kts, with sea breeze variations modifying the direction for TJSJ/TJMZ/TJBQ.

MARINE . Fairly tranquil marine conditions with seas between 1 and 4 feet will prevail across the regional waters through at least Friday afternoon. Marine conditions are expected to deteriorate as a northerly swell invades the Atlantic waters and local waters by Friday evening into the weekend. Therefore, a Small Craft Advisory is in effect for the offshore Atlantic waters by Friday evening. There is a moderate risk of rip currents for beaches along the north coast of Puerto Rico and Culebra. The risk will elevate to high by Friday morning for beaches along the north central coast of Puerto Rico, and by Friday afternoon for the remaining beaches along the north coast of Puerto Rico, including beaches of Mayaguez and Vicinity.

PRELIMINARY POINT TEMPS/POPS. SJU 73 90 74 87 / 20 30 20 50 STT 74 84 74 80 / 30 30 30 30

SJU WATCHES/WARNINGS/ADVISORIES. PR . High Rip Current Risk from Friday evening through Sunday afternoon for Mayaguez and Vicinity-Northeast-Northwest-San Juan and Vicinity-Southeast.

High Rip Current Risk from 6 AM AST Friday through Sunday afternoon for North Central.

VI . None. AM . Small Craft Advisory from 8 PM Friday to 8 PM AST Sunday for Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N.



SHORT TERM . LIS LONG TERM . 99 PUBLIC DESK . ICP


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
41056 10 mi47 min SSE 7.8 G 9.7 79°F 81°F2 ft1013.1 hPa (+0.0)
CLBP4 - 9752235 - Culebra, PR 18 mi47 min 79°F 82°F1013.8 hPa (+0.0)
ESPP4 - 9752695 - Esperanza, PR 18 mi47 min SSE 7 G 8.9 82°F 82°F1014.2 hPa (+0.0)
41053 - San Juan, PR 27 mi47 min S 5.8 G 9.7 79°F 80°F2 ft1013 hPa (+0.4)
SJNP4 - 9755371 - San Juan, PR 27 mi47 min SSW 6 G 7 78°F 82°F1014.2 hPa (+0.4)
CHAV3 - 9751639 - Charlotte Amalie, VI 38 mi47 min 79°F 1014.1 hPa (+0.0)
JOXP4 - Jobos Bay Reserve, Puerto Rico 40 mi62 min Calm 75°F 1016 hPa69°F
LAMV3 49 mi47 min 76°F 83°F

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, PR21 mi1.9 hrsSSW 510.00 miFair79°F70°F74%1014.4 hPa

Link to 5 minute data for TJSJ

Wind History from JSJ (wind in knots)
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Last 24hrS3SW5S3S3CalmCalmCalmCalmCalm564536SE9S8
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1 day agoCalmS3CalmS3CalmCalmCalmS4SE4E83S8
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2 days agoE4S3CalmCalmCalmCalmCalmW3S3N5NE10NE13NE15E13NE13E13E14E11E9--E5CalmE4Calm

Tide / Current Tables for Playa de Fajardo, Puerto Rico
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Playa de Fajardo
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Fri -- 02:44 AM AST     Moonset
Fri -- 04:47 AM AST     1.50 feet High Tide
Fri -- 06:14 AM AST     Sunrise
Fri -- 11:17 AM AST     0.41 feet Low Tide
Fri -- 02:14 PM AST     Moonrise
Fri -- 04:16 PM AST     0.89 feet High Tide
Fri -- 06:36 PM AST     Sunset
Fri -- 10:30 PM AST     -0.11 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.711.31.51.51.41.20.90.70.50.40.40.50.70.80.90.90.70.50.30-0.1-0.1

Tide / Current Tables for Vieques Passage, Puerto Rico Current
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Vieques Passage
Click for Map
Fri -- 12:13 AM AST     -0.42 knots Max Ebb
Fri -- 02:43 AM AST     Moonset
Fri -- 02:57 AM AST     0.00 knots Slack
Fri -- 06:14 AM AST     Sunrise
Fri -- 06:25 AM AST     0.64 knots Max Flood
Fri -- 09:36 AM AST     -0.00 knots Slack
Fri -- 01:04 PM AST     -0.74 knots Max Ebb
Fri -- 02:14 PM AST     Moonrise
Fri -- 04:41 PM AST     0.00 knots Slack
Fri -- 06:36 PM AST     Sunset
Fri -- 07:26 PM AST     0.47 knots Max Flood
Fri -- 10:18 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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-0.4-0.4-0.200.30.50.60.60.50.2-0.1-0.4-0.7-0.7-0.7-0.5-0.20.10.30.50.40.30.1-0.2

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 (0,6,7,8)
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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 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.