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Marine Weather and Tides Santo Domingo, 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.

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Sunrise 6:16AM

Sunset 6:18PM

Tuesday September 29, 2020 11:04 PM AST (03:04 UTC)

Moonrise 5:18PM

Moonset 4:23AM

Illumination 95%

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.

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7 Day Forecast for Marine Location Near Santo Domingo, PR

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Area Discussion for - San Juan, PR

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FXCA62 TJSJ 300145 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 945 PM AST Tue Sep 29 2020

UPDATE.

The leading edge of an approaching tropical wave will bring periods of showers and thunderstorms across the regional waters, and windward sections in the U.S. Virgin Islands and Puerto Rico. Unstable weather conditions will prevail through at least Wednesday night, then a drier air mass with African dust is expected to move from the east prevailing through at least Friday. No significant changes were made to the inherited forecast.

AVIATION. Clouds, SHRA and possible isold TSRA will move at times through the forecast period due to an approaching tropical wave. Although the activity is expected to remain away from the TAF thru 30/15z could affect JSJ/IST/ISX/NCM/KPK and btwn 30/15-25 could also impact JBQ/JPS. Winds will remain calm to light and vrb thru 30/13z, returning from the ESE at 10 to 15 but gusty especially in and around TSRA.

MARINE. Small craft operators should exercise caution due to seas between 15 and 20 knots and across the offshore waters due to seas up to 6 feet. A tropical wave will bring showers and thunderstorms across the local waters through at least tomorrow night.

PREV DISCUSSION. /issued 427 PM AST Tue Sep 29 2020/

SYNOPSIS .

Thunderstorms activity moved into the Mona Passage and Atlantic Offshore waters. However, more showers and thunderstorms will affect the islands overnight and tomorrow associated with an approaching disorganized tropical wave. Thereafter, drier air with African dust particles will move in for the rest of the workweek. This weekend will be more active with deep moisture moving up from the south. Winds will pick up for the next few days due to strong high pressure in the central Atlantic. Small craft operators should exercise caution under these conditions.

SHORT TERM . Rest of Today through Thursday .

A large area of high pressure exists at the surface and mid-levels over the central Atlantic, and even extends into the upper atmosphere as well. Embedded in the high pressure ridge at upper levels, there is an area of low pressure to our east and another to our southwest, but neither are very helpful in enhancing convection. 500mb temperatures are about average, at -7C degrees. Regarding the low pressure to our east, it is expected to stay generally stationary for the short term period, and we would be on the convergent side of that, which is unhelpful for thunderstorms. However, cooler temperatures at mid-levels will move in, and between tomorrow and Thursday the 500mb temps will be between -8C and -10C, which is helpful for thunderstorms. Thus, with various factors working against each other, we will likely have isolated but not widespread thunderstorm activity.

There will be ample moisture in place for tonight and tomorrow due to a disorganized tropical wave. Thus overnight, there will be scattered to widespread showers and a few thunderstorms over the local waters, and will most likely impact the USVI and coastal areas of eastern Puerto Rico. The low-level winds are expected to be fairly breezy over the next few days, so the showers should move along quickly. By tomorrow afternoon under east-southeast flow, showers and isolated thunderstorms are expected over interior and western Puerto Rico. The waters adjacent to western Puerto Rico will likely see some thunderstorms as moderate winds blow the showers offshore. The San Juan Metro may also see some shower activity as well. By Thursday, some important changes take place. Drier air with light to moderate amounts of Saharan dust are expected to move in. Thus the shower activity overnight Wednesday into Thursday out over the local waters will really slow down. In the afternoon, there will still be enough moisture to trigger showers, but with the drier air and 15 to 25 knot low-level winds, impacts from these showers should definitely be less than the past few days. With east to slightly east-southeast winds, showers will be focused over western Puerto Rico and again blown offshore.

LONG TERM . Friday through Wednesday .

PREV DISCUSSION . /issued 402 AM AST Tue Sep 29 2020/

Somewhat drier air is expected to move in on Friday, perhaps with some Saharan dust, which could limit the shower and thunderstorm activity across the area. However, there is a tilted upper level trough that could help in the development of thunderstorms over the general area. This upper trough is forecast by the global models to remain near the local islands through the long term period, with the latest model run being more aggressive than the model run from yesterday. There is also a strong SFC-high pressure in the central Atlantic that will dominate the local wind flow, keeping us observing east to east-southeast winds. That said, the SFC-high will move into the eastern Atlantic by early next week, but the winds will remain from the east to east- southeast. The available moisture is expected to be near normal on Friday and Saturday, but increasing to above normal from Sunday onward. So given the current setup, we can expect morning and overnight isolated to scattered showers with isolated thunderstorms over the waters, near the USVI and eastern PR, while each afternoon, showers and thunderstorms can be expected across portions of central and western PR and areas of sea breeze convergence.

AVIATION . Expect TSRA/+SHRA to dvlp interior and NW PR with mtn obscurations and areas of MVFR/IFR. TJBQ/TJMZ likely to have brief MVFR. Sfc winds 8-15 kt with hir gusts on the coasts, bcmg aft 29/23Z 5-12kt. Max Winds ESE-SE arnd 26 knots at FL023 and FL155 diminishing somewhat during the next 18 hrs.

MARINE .

Winds will be the biggest issue over the next few days due to strong high pressure in the central Atlantic. Thus, small craft operators should exercise caution due to winds up to 20 knots, with isolated areas of higher winds. Moderate rip current risks will spread around the coast during the next several days. Seas will also become more choppy, but at this time, areas of 7 foot seas are not expected until Thursday or Thursday night.

PRELIMINARY POINT TEMPS/POPS. SJU 79 90 79 89 / 70 60 50 50 STT 80 89 81 90 / 70 70 70 50

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

SHORT TERM . CAM LONG TERM . CS PUBLIC DESK . GL

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Weather Reporting Stations

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Stations	Dist	Age	Wind	Air Temp	Water Temp	Waves	Pressure	DewPt
MGIP4 - 9759110 - Magueyes Islands, PR	18 mi	46 min	SE 1.9 G 5.1	81°F	86°F		1015 hPa
42085 - Southeast of Ponce, PR	20 mi	64 min	E 14 G 16	86°F	86°F	4 ft	1014.2 hPa (+1.6)
MGZP4 - 9759394 - Mayaguez, PR	23 mi	52 min		81°F	87°F		1015.9 hPa
JOXP4 - Jobos Bay Reserve, Puerto Rico	30 mi	79 min	NNE 5.1	79°F			1017 hPa	74°F
PTRP4	32 mi	19 min	E 6 G 7	80°F
41115 - Rincon, Puerto Rico (181)	34 mi	38 min			86°F	3 ft
SJNP4 - 9755371 - San Juan, PR	42 mi	46 min	E 5.1 G 6	84°F	86°F		1015.6 hPa
41053 - San Juan, PR	43 mi	64 min	SSE 5.8 G 9.7	85°F	85°F	3 ft	1014.6 hPa (+1.7)

Wind History for Penuelas (Punta Guayanilla), PR

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Airport Reports

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Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure

Link to 5 minute data for TJPS

Wind History from JPS (wind in knots)

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Tide / Current Tables for Playa de Ponce, Puerto Rico

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Tide / Current Tables for Guanica, Puerto Rico

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Weather Map

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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

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Ground Weather Radar Station Puerto Rico,Virgin Islands

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