Tuesday, September28, 2021
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Marine Weather and Tides
Guayama, PR

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:13AMSunset 6:16PM Tuesday September 28, 2021 1:21 AM AST (05:21 UTC) Moonrise 11:48PMMoonset 12:36PM Illumination 57% Phase: Waning Gibbous; Moon at 21 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- 916 Pm Ast Mon Sep 27 2021
Rest of tonight..Northeast winds 5 to 10 knots. Seas 2 feet or less. Dominant period 10 seconds. Isolated showers.
Tuesday..East winds 5 to 10 knots. Seas 2 feet or less. Dominant period 11 seconds. Isolated showers.
Tuesday night..East winds 5 to 10 knots. Seas 2 feet or less. Dominant period 11 seconds. Isolated showers through the night.
Wednesday..East winds 5 to 10 knots. Seas 2 feet or less. Dominant period 11 seconds. Isolated showers.
Wednesday night..Northeast winds 5 to 10 knots. Seas 2 feet or less. Dominant period 11 seconds. Isolated showers.
Thursday..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 11 seconds. Scattered showers. Isolated Thunderstorms.
Friday..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 11 seconds. Isolated showers.
Saturday..East winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 8 seconds. Scattered showers. Isolated Thunderstorms.
AMZ700 916 Pm Ast Mon Sep 27 2021
Synopsis for puerto rico and the uS. Virgin islands waters... Light to gentle easterly winds, and seas of 4 feet or less will continue over the outer and local waters through Tuesday. Deteriorating and hazardous marine and coastal conditions are expected by midweek, due to swells generated by major hurricane sam. The official forecast from the national hurricane center has sam passing by well to the northeast of the islands by Thursday.


7 Day Forecast for Marine Location Near Guayama, PR
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location: 17.93, -66.1     debug


Area Discussion for - San Juan, PR
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FXCA62 TJSJ 280134 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 934 PM AST Mon Sep 27 2021

UPDATE. No change to the previous short term forecast and reasoning at this time. Afternoon showers and thunderstorm activity continued to gradually move offshore and diminish over Puerto Rico, with mostly isolated passing showers over the rest of the coastal waters. Skies will become mostly clear to partly cloud over land overnight with a chance of passing showers to briefly reach some coastal areas from time to time. The recent 28/00Z upper air sounding was fairly dry and stable except for some shallow moisture below FL100. Light low level winds continued from the E-NE at 5-10 knots below FL180.

No change on the present forecast and track of Hurricane Sam based on last Advisory #21 from the National Hurricane Center. Sam is moving toward the northwest near 9 mph, and this motion is expected to continue for the next few days, with an increase in forward speed beginning on Thursday. A turn to the north is expected by Friday. On the present forecast track, Sam will pass well to the northeast of the local islands.

However, deteriorating and hazardous local marine and surf zone conditions will be likely by Wednesday onwards through the rest of week.

AVIATION UPDATE. Aftn convection gradually diminishing ovr PR and now mainly SHRA with few TSRA the SW Mona Passage and nr shore Caribbean waters. otherwise Isold SHRA en route btw islands and over the rest of the regional waters. Prevailing VFR durg prd. SCT ocnl BKN lyrs nr FL025 . FL050 with wdly SCT SHRA en route btw islands SFC wnds lgt/vrb. bcmg fm E 10-15 kts with sea breeze variations aft 28/14Z. No sig operational wx impacts across the flying area durg the rest of the period.

MARINE UPDATE. No change to the previous marine discussion and short term grids at this time. Overall Seas will continue at 4 feet or less with easterly winds generally between 5 to 10 kts overnight into Tuesday. Deteriorating marine and surf conditions still expected by Wednesday onwards due to large swells generated by Hurricane Sam which will spread across portions of the regional waters.

PREV DISCUSSION. /issued 353 PM AST Mon Sep 27 2021/

SYNOPSIS . An increase in moisture and instability by the middle of the workweek will cause organized convection to develop across portions of Puerto Rico. Light steering winds will likely lead to heavy rainfall and urban and small stream flooding. Deteriorating and hazardous marine and coastal conditions are expected by midweek, due to swells generated by Major Hurricane Sam.

SHORT TERM . Tonight through Wednesday .

Partly cloudy skies were observed this afternoon across most of the area. The sea breeze and local effects induce showers across the interior and western areas Puerto Rico. Currently, this activity has produced rainfall amounts up to two inches near the city of Guayanilla, Indios, and Vazquez. Due to the slow movement of the showers and thunderstorms, I expect several Flood Advisories for the interior and western areas of Puerto Rico this afternoon. Today's high temperatures were near the upper 80s to lower 90s across the local islands. Winds were from the east up to 20 mph with higher gusts.

Late tonight through Tuesday, a drier air mass will advect into the region from the east. The drier air mass should limit shower activity during the overnight hours. Nevertheless, a few stray showers can't be ruled out. Overnight low temperatures are forecast to be near the upper 70s to lower 80s in lower elevations and the upper 60s to the lower 70s in higher elevations. Tuesday afternoon, showers and isolated thunderstorms are possible across the interior and northwestern areas of Puerto Rico due to sea breeze convergence and diurnal effects. Lake the previous days, light steering winds will cause showers and thunderstorms to move slowly, thus leading to urban and small stream flooding.

Wednesday, An increase in upper-level instability, moisture content, and diurnal heating will induce organized convection during the afternoon for parts of the interior, northwestern, and western areas of Puerto Rico.

LONG TERM . Thursday through Monday . At least for Thursday and Friday, the forecast across the islands will depend on the track of Hurricane Sam. Currently, the official forecast for Sam is to pass about 400 miles northeast of the islands on Thursday. Based on this track, a northeast steering wind flow is expected on Thursday, with patches of moisture moving at times over the region. Meanwhile, an upper level trough west of the region should provide some instability over the area. This should favor an advective pattern during the night/early morning hours, with showers moving over the USVI and east/northeast sections of PR. Then in the afternoon, diurnally induced afternoon showers with isolated thunderstorms should develop along the Cordillera Central and southern sections of PR. As Sam pulls away further north on Friday, a low-level trough is forecast to develop over the area, and winds are expected to turn from the east-southeast, favoring diurnal convection along the interior and northern slopes of PR.

For Saturday, a tropical wave is forecast to cross the region, increasing moisture content and the areal coverage of showers across the islands. Moisture is expected to quickly erode on Sunday, as a ridge builds from the east, promoting drier air and more stable conditions through Monday. However, typical afternoon convection cannot be ruled out over the western interior sections of PR, and from streamers downwind of the USVI. Moderate trade winds are expected to return during the weekend.

AVIATION . Mainly VFR conditions will continue through the next 24 hours. SHRA/TSRA will develop across the interior and west PR thru 27/23z, and could result in brief MVFR conds with mtn obscurations, especially for TJPS and TJBQ. VCSH also possible across the USVI and Leeward terminals through 28/12Z. Surface winds will continue from the east around 10 kt, with sea breeze variations. Winds will become light and variable after 27/23z and will return from the east after 28/12z.

MARINE . Tranquil marine conditions will continue to prevail through Tuesday across the local and near-shore waters. Seas will range from 1 to 4 feet with light to moderate winds. There is a moderate risk of rip currents for the north-facing beaches of Puerto Rico. Deteriorating and hazardous marine and coastal conditions are expected by midweek, due to swells generated by Major Hurricane Sam.

PRELIMINARY POINT TEMPS/POPS. SJU 79 88 78 90 / 40 30 20 30 STT 78 88 78 88 / 40 30 30 30

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

SHORT TERM . RAM LONG TERM . TW PUBLIC DESK . OM


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
JOXP4 - Jobos Bay Reserve, Puerto Rico 7 mi97 min Calm 80°F 1016 hPa74°F
42085 - Southeast of Ponce, PR 23 mi82 min NNE 7.8 G 7.8 82°F 1 ft1014.3 hPa (+0.0)
SJNP4 - 9755371 - San Juan, PR 37 mi52 min ESE 6 G 7 83°F 87°F1014.3 hPa
41053 - San Juan, PR 38 mi82 min E 5.8 G 7.8 83°F 86°F2 ft1014 hPa (+0.3)
41056 41 mi82 min ENE 7.8 G 9.7 84°F 86°F2 ft1012.7 hPa (+0.6)
CLBP4 - 9752235 - Culebra, PR 49 mi52 min 81°F 86°F1014.2 hPa

Wind History for Yabucoa Harbor, 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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Tide / Current Tables for Arroyo, Puerto Rico
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Arroyo
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Tue -- 04:51 AM AST     0.27 feet Low Tide
Tue -- 06:14 AM AST     Sunrise
Tue -- 12:35 PM AST     Moonset
Tue -- 06:15 PM AST     Sunset
Tue -- 08:27 PM AST     1.00 feet High Tide
Tue -- 09:58 PM AST     Last Quarter
Tue -- 11:46 PM AST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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Tide / Current Tables for Punta Tuna, Puerto Rico
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Punta Tuna
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Tue -- 06:05 AM AST     0.04 feet Low Tide
Tue -- 06:13 AM AST     Sunrise
Tue -- 12:35 PM AST     Moonset
Tue -- 03:38 PM AST     0.79 feet High Tide
Tue -- 06:14 PM AST     Sunset
Tue -- 09:58 PM AST     Last Quarter
Tue -- 11:46 PM AST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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