Tuesday, September29, 2020
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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.

Sunrise 6:16AMSunset 6:18PM Tuesday September 29, 2020 11:04 PM AST (03:04 UTC) Moonrise 5:18PMMoonset 4:23AM Illumination 95% 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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AMZ735 Coastal Waters Of Southern Puerto Rico Out 10 Nm- 947 Pm Ast Tue Sep 29 2020
.small craft should exercise caution...
Rest of tonight..East winds 15 to 20 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. And isolated Thunderstorms.
Wednesday..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Scattered showers and isolated Thunderstorms.
Wednesday night..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Scattered showers and isolated Thunderstorms.
Thursday..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated Thunderstorms in the morning. Scattered showers through the day.
Thursday night..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Scattered showers and isolated Thunderstorms.
Friday..East winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 7 seconds. Scattered showers. Isolated Thunderstorms.
Saturday..East winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 7 seconds. Scattered showers. Isolated Thunderstorms.
Sunday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers.
AMZ700 947 Pm Ast Tue Sep 29 2020
Synopsis for puerto rico and the uS. Virgin islands waters... A high pressure across the north-central atlantic will cause moderate to locally fresh east-southeast winds through much of the workweek, causing choppy seas. A tropical wave will move across puerto rico and the u.s. Virgin islands overnight and tomorrow, followed by a drier air mass with african dust particulate.


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 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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MGIP4 - 9759110 - Magueyes Islands, PR 18 mi46 min SE 1.9 G 5.1 81°F 86°F1015 hPa
42085 - Southeast of Ponce, PR 20 mi64 min E 14 G 16 86°F 86°F4 ft1014.2 hPa (+1.6)
MGZP4 - 9759394 - Mayaguez, PR 23 mi52 min 81°F 87°F1015.9 hPa
JOXP4 - Jobos Bay Reserve, Puerto Rico 30 mi79 min NNE 5.1 79°F 1017 hPa74°F
PTRP4 32 mi19 min E 6 G 7 80°F
41115 - Rincon, Puerto Rico (181) 34 mi38 min 86°F3 ft
SJNP4 - 9755371 - San Juan, PR 42 mi46 min E 5.1 G 6 84°F 86°F1015.6 hPa
41053 - San Juan, PR 43 mi64 min SSE 5.8 G 9.7 85°F 85°F3 ft1014.6 hPa (+1.7)

Wind History for Penuelas (Punta Guayanilla), PR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure

Link to 5 minute data for TJPS

Wind History from JPS (wind in knots)
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Last 24hr--------------------------------------E5NE5NE5--Calm
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Tide / Current Tables for Playa de Ponce, Puerto Rico
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Playa de Ponce
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Tue -- 04:23 AM AST     Moonset
Tue -- 06:16 AM AST     Sunrise
Tue -- 06:45 AM AST     0.90 feet High Tide
Tue -- 10:15 AM AST     0.30 feet Low Tide
Tue -- 05:17 PM AST     Moonrise
Tue -- 06:16 PM AST     Sunset
Tue -- 08:30 PM AST     0.89 feet High Tide
Tue -- 10:34 PM AST     0.61 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.70.70.80.80.80.90.90.90.70.50.30.30.30.40.50.50.60.70.80.90.90.80.70.6

Tide / Current Tables for Guanica, Puerto Rico
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Guánica
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Tue -- 04:24 AM AST     Moonset
Tue -- 06:02 AM AST     0.79 feet High Tide
Tue -- 06:17 AM AST     Sunrise
Tue -- 10:46 AM AST     0.26 feet Low Tide
Tue -- 05:18 PM AST     Moonrise
Tue -- 06:17 PM AST     Sunset
Tue -- 07:47 PM AST     0.78 feet High Tide
Tue -- 11:05 PM AST     0.54 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    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
Ground Weather Radar Station Puerto Rico,Virgin Islands
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