Thursday, January23, 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 7:00AMSunset 6:17PM Thursday January 23, 2020 3:19 AM AST (07:19 UTC) Moonrise 5:59AMMoonset 5:18PM Illumination 4% Phase: Waning Crescent; Moon at 28 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- 920 Pm Ast Wed Jan 22 2020
Rest of tonight..South winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Scattered showers.
Thursday..Southwest winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 8 seconds. Scattered showers and isolated Thunderstorms.
Thursday night..Northwest winds 5 to 10 knots veering north after midnight. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Isolated Thunderstorms in the evening. Scattered showers through the night.
Friday..Northeast winds 5 to 10 knots veering southeast in the afternoon. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Scattered showers.
Friday night..Northeast winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 11 seconds. Scattered showers.
Saturday..Northeast winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 11 seconds. Isolated showers.
Sunday..Northeast winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 10 seconds. Isolated showers.
Monday..Southeast winds 5 to 10 knots. Seas 2 feet or less. Dominant period 10 seconds. Isolated showers.
AMZ700 920 Pm Ast Wed Jan 22 2020
Synopsis for puerto rico and the uS. Virgin islands waters... A surface high pressure extending across the atlantic will maintain a moderate southerly wind flow across the region through Thursday. Winds will become gentle to moderate and variable on Friday as a frontal boundary moves in. Tranquil marine conditions will persist tonight into Thursday, but another northerly swell is expected to cause hazardous seas from Thursday night through Sunday.


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 230051 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 851 PM AST Wed Jan 22 2020

UPDATE. Showers have been affecting sections of eastern and southern Puerto Rico since the afternoon hours. So far, the highest accumulations have been registered along the southeastern coast of Puerto Rico. As a frontal system approaches from the west, the frequency of showers and isolated thunderstorms is expected to increase over the area, starting tomorrow morning over western Puerto Rico and extending toward the rest of the area in the afternoon. There is a risk for isolated thunderstorms as well.

AVIATION. Mainly VFR conditions are expected to prevail tonight. After 23/12Z, showers will increase across western Puerto Rico, which should reduce VIS along TJMZ/TJBQ at times. This activity will spread along the rest of Puerto Rico and the U.S. Virgin Islands in the afternoon and evening hours. The latest TJSJ 23/00Z sounding shows winds out of the S at 10 to 18 knots at FL050.

MARINE. Seas up to 5 feet and winds up to 15 knots are expected to prevail tonight and tomorrow. Then, by tomorrow night, a northerly swell will create hazardous seas along the local waters. For the beachgoers, there is a moderate risk of rip currents along the northern coast of Puerto Rico, Culebra and a few beaches along Vieques, St. Thomas and eastern St. Croix.

PREV DISCUSSION. /issued 135 PM AST Wed Jan 22 2020/

SYNOPSIS . An extended area of low-level moisture will continue to enhance shower activity through early tonight under a south- southeasterly steering flow. A pre-frontal trough, followed by the frontal boundary and associated features, will move in on Thursday and stall across the region through the weekend. The effects of these features, coupled with favorable conditions aloft and a weak steering flow, will enhance shower and possible thunderstorm activity that will elevate the threat for flooding across the region. Although lingering moisture will persist through early next week, improved weather conditions are expected.

SHORT TERM . Tonight through Friday .

An extended patch of low-level moisture, associated to the remnants of a nearly stationary old frontal boundary, will continue to affect the area through late tonight. This activity, in the form of isolated to scattered showers, is expected to affect portions of southern and eastern Puerto Rico under a generally moderate south-southeasterly wind flow. By late tonight into Thursday morning, a pre- frontal trough will approach the forecast area from the northwest and generate a weaker and more southerly wind flow as it continues to move eastward across the area. In the meantime, a frontal boundary and associated features will quickly move in and stall over the region through the end of the short-term period. Overall, the combination of a strong low- level convergence, an increase in low- level moisture (GFS suggests precipitable water vapor up to 1.80 inches by Thursday afternoon), and favorable conditions aloft (upper-level polar trough with 500 mb temperatures dropping around -8C) will support a significant increase in shower activity and the potential for isolated thunderstorms across the forecast area on Thursday and Friday. This activity will elevate the threat for flooding across the local islands.

LONG TERM . Saturday through Wednesday .

FROM PREV DISCUSSION . /issued 524 AM AST Wed Jan 22 2020/

By Saturday and through the weekend, model guidance suggest lingering low level moisture but overall improving and stable conditions aloft with a much drier airmass expected to move across the region. Expect less frequent early morning passing showers activity across the islands and coastal waters. This will be followed by isolated to scattered showers of short duration during the afternoon hours. Improving conditions are forecast by Monday and through Wednesday, as the surface high pressure will once again build and spread eastward across the west Atlantic, resulting in a more east northeast wind flow on Monday, then becoming fairly light and more southeasterly by Tuesday.

AVIATION . Mainly VFR conditions expected to prevail across all terminals. However, SHRA over northern PR could cause tempo MVFR conds at TJSJ/TJBQ between 18z-22z. Shower activity increases overnight through Thursday from the western and southern waters of PR. Causing sct-bkn cigs btw FL030-FL070 and RA/VCSH across the area terminals. Southeast winds will continue between 10-15 knots, decreasing to 5-10 kt on Thursday with a westerly component.

MARINE . A surface high pressure extending across the Atlantic will support a moderate southeasterly flow across the region, then winds are expected to gradually turn from the south late tonight into Thursday. Relatively tranquil marine conditions will persist tonight, but the arrival of another northerly swell will generate hazardous seas by Thursday night into the weekend. An increase in shower activity can be expected with the potential for scattered to numerous showers and isolated thunderstorms during the next few days. There is a moderate risk for rip currents for beaches along the north coast of Puerto Rico, including Culebra and Vieques, as well as the US Virgin Islands. The risk will elevate to high by Thursday night as a northerly swell begins to invade the local waters.

PRELIMINARY POINT TEMPS/POPS. SJU 73 86 74 82 / 30 70 70 50 STT 76 82 75 83 / 40 70 70 50

SJU WATCHES/WARNINGS/ADVISORIES. PR . None. VI . None. AM . None.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MGIP4 - 9759110 - Magueyes Islands, PR 18 mi50 min 80°F 79°F1011.9 hPa
42085 - Southeast of Ponce, PR 20 mi80 min SSE 7.8 G 9.7 80°F 81°F3 ft1010.7 hPa (-1.5)
MGZP4 - 9759394 - Mayaguez, PR 23 mi50 min 81°F1011.9 hPa
AROP4 - 9757809 - Arecibo, PR 26 mi62 min Calm G 0
JOXP4 - Jobos Bay Reserve, Puerto Rico 30 mi95 min SSW 1 76°F 1013 hPa71°F
PTRP4 32 mi20 min S 5.1 G 8.9 75°F
41115 - Rincon, Puerto Rico (181) 34 mi20 min 81°F3 ft
SJNP4 - 9755371 - San Juan, PR 42 mi50 min 77°F 80°F1010.8 hPa
41053 - San Juan, PR 43 mi80 min SSE 5.8 G 7.8 77°F 81°F2 ft1010.2 hPa (-1.4)
YABP4 - 9754228 - Yabucoa Harbor, PR 49 mi50 min 80°F 70°F

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
Thu -- 05:57 AM AST     Moonrise
Thu -- 07:00 AM AST     Sunrise
Thu -- 10:33 AM AST     0.60 feet High Tide
Thu -- 12:03 PM AST     0.51 feet Low Tide
Thu -- 05:17 PM AST     Moonset
Thu -- 05:57 PM AST     0.53 feet High Tide
Thu -- 06:15 PM AST     Sunset
Thu -- 11:07 PM AST     -0.49 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 (2,6,7,8)
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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.