Saturday, April4, 2020
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Marine Weather and Tides
Santo Domingo, 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 6:17AMSunset 6:42PM Saturday April 4, 2020 7:36 PM AST (23:36 UTC) Moonrise 3:22PMMoonset 3:40AM Illumination 90% Phase: Waxing Gibbous; Moon at 12 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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AMZ735 Coastal Waters Of Southern Puerto Rico Out 10 Nm- 401 Pm Ast Sat Apr 4 2020
Tonight..Southeast winds 5 to 10 knots backing north after midnight. Seas 1 to 3 feet. Dominant period 11 seconds. Isolated showers.
Sunday..Southeast winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 10 seconds.
Sunday night..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Isolated showers through the night.
Monday..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds.
Monday night..Northeast winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 11 seconds. Isolated showers.
Tuesday..Northeast winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Isolated showers.
Wednesday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers.
Thursday..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Isolated showers.
AMZ700 401 Pm Ast Sat Apr 4 2020
Synopsis for puerto rico and the uS. Virgin islands waters... Marine conditions will deteriorate across the atlantic waters and local passages through the weekend with the arrival of a northerly swell, resulting in hazardous seas. Isolated to scattered showers over the local waters are expected as a cold front pushes into the area.


7 Day Forecast for Marine Location Near Santo Domingo, PR
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location: 18.1, -66.75     debug


Area Discussion for - San Juan, PR
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FXCA62 TJSJ 042024 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 424 PM AST Sat Apr 4 2020

SYNOPSIS. A weak cold front will approach the area through the weekend, resulting in an increase in moisture and showers across the islands. Hazardous marine conditions are expected to continue due to a northerly swell. Available moisture and local effects will also trigger showers during the afternoon hours through the long- term forecast period.

SHORT TERM. Tonight through Monday .

A weak cold front will continue to approach from the northwest while weakening. Moisture associated with this system resulted in showers development through the afternoon hours across the interior and northeastern Puerto Rico. This activity is expected to continue through the evening hours, with minor flooding possible or at least ponding of water on roadways and low-lying areas.

The greatest threat from this front will be the possibility of persistent showers over a given area that leads to localized flooding. Fairly slow low level winds could cause showers to stall, leading to higher rainfall accumulations. The best chance for showers will likely be tomorrow afternoon when the greatest amount of moisture is over us, coupled with surface heating. The upper-level atmospheric conditions will not provide much support for thunderstorms, though an occasional lightning strike can't be ruled out by the more vigorous showers.

To summarize the short term forecast, this weak cold front will continue to drive shower activity over the interior of Puerto Rico into the evening hours, and over the Atlantic waters overnight. Tomorrow afternoon will have the highest chance for impactful showers, after which showers will quickly slow down as the sun sets on Sunday. Monday looks calmer with less moisture around and somewhat unfavorable atmospheric conditions as an inversion develops at around 850 mb. Some showers are still possible for Monday afternoon over interior Puerto Rico, though impacts will be minimal.

LONG TERM. Tuesday through Monday .

FROM PREVIOUS DISCUSSION . /issued at 434 AM AST Sat Apr 4/

On Tuesday the drier air behind the weakening frontal boundary will filter into the forecast area. Nevertheless there will be enough moisture for early morning showers along the windward coast in the northeast of Puerto Rico during the overnight and early morning period. This moisture will play into local effects and also produce showers over southwest Puerto Rico Tuesday afternoon. Moisture then increases Tuesday night through Thursday evening as a band of moisture that was pulled out of South America Sunday and formed southeast of the area, slowly moves over Puerto Rico and the U.S. Virgin Islands. Since surface flow Tuesday through Thursday will remain east northeast this moisture will help generate showers for the eastern coasts of Puerto Rico with some isolated showers over the U.S. Virgin Islands.

High pressure at the surface over the western tropical Atlantic will move into the Caribbean over the next weekend and dissipate. Surface winds become southeasterly Friday and saturday and the northeast coastal portion of Puerto Rico will warm into the upper 80s to lower 90s again. The high pressure will be closely followed by a trough in the lower levels that will drag some of the best moisture in several weeks across the area late in that weekend, Sunday and Monday.

AVIATION. SHRA will develop over the mountain areas of PR btwn thru 05/02z. Some SHRA will move across JBQ/JSJ/IST at times. JSJ can expect periods of SHRA/+SHRA, especially btwn 04/21-05/00z. The potential for brief MVFR conditions will slowly increase over the USVI, and the northern and western terminals of PR as the frontal boundary moves closer to the islands through the fcst period. Winds will continue calm to light and variable, with sea breeze variations thru at least 04/22z.

MARINE. Hazardous marine conditions are expected for the Atlantic waters and passages through early on the workweek. Seas up to 7 feet are expected. Small craft advisories are in effect for these waters. For the beaches, a high rip current risk continues for most of the northern coast of the islands and for eastern St. Croix.

PRELIMINARY POINT TEMPS/POPS. SJU 77 84 75 85 / 40 30 30 30 STT 75 79 74 79 / 40 30 30 30

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

VI . High Rip Current Risk through Tuesday afternoon for St Thomas. St John. and Adjacent Islands.

High Rip Current Risk through Sunday afternoon for St Croix.

AM . Small Craft Advisory until 8 PM AST Monday for Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N-Coastal Waters of Northern Puerto Rico out 10 NM.

Small Craft Advisory from 8 AM Sunday to 8 PM AST Monday for Mona Passage Southward to 17N.

Small Craft Advisory from 8 AM Sunday to 8 AM AST Monday for Coastal Waters of Northwestern Puerto Rico out 10 NM.



SHORT TERM . RAM LONG TERM/PUBLIC DESK . ERG


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MGIP4 - 9759110 - Magueyes Islands, PR 18 mi49 min SSW 2.9 G 5.1 81°F 83°F1012.6 hPa
42085 - Southeast of Ponce, PR 20 mi97 min SE 3.9 G 5.8 82°F 82°F2 ft1011.4 hPa (+0.4)
MGZP4 - 9759394 - Mayaguez, PR 23 mi55 min 81°F 84°F1013.3 hPa
AROP4 - 9757809 - Arecibo, PR 26 mi49 min NNW 6 G 7
JOXP4 - Jobos Bay Reserve, Puerto Rico 30 mi112 min SE 4.1 82°F 1013 hPa71°F
PTRP4 32 mi67 min W 2.9 G 6 80°F
41115 - Rincon, Puerto Rico (181) 34 mi37 min 82°F6 ft
SJNP4 - 9755371 - San Juan, PR 42 mi49 min SSE 8 G 9.9 76°F 83°F1013.2 hPa
41053 - San Juan, PR 43 mi97 min S 7.8 G 12 79°F 82°F8 ft1011.4 hPa (+0.9)

Wind History for Penuelas (Punta Guayanilla), PR
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Airport Reports
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Tide / Current Tables for Punta Guayanilla, 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 Playa de Ponce, Puerto Rico
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Playa de Ponce
Click for Map
Sat -- 03:38 AM AST     Moonset
Sat -- 06:17 AM AST     Sunrise
Sat -- 07:26 AM AST     0.80 feet High Tide
Sat -- 09:04 AM AST     0.59 feet Low Tide
Sat -- 03:21 PM AST     Moonrise
Sat -- 05:19 PM AST     0.74 feet High Tide
Sat -- 06:40 PM AST     Sunset
Sat -- 09:01 PM AST     -0.01 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (19,4,5,8)
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Ground Weather Radar Station Puerto Rico,Virgin Islands
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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.