Thursday, July29, 2021
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Marine Weather and Tides
Culebra, 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 5:55AMSunset 6:56PM Thursday July 29, 2021 10:00 PM AST (02:00 UTC) Moonrise 11:06PMMoonset 10:53AM Illumination 68% Phase: Waning Gibbous; Moon at 20 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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AMZ725 Coastal Waters Of Southern Usvi Vieques And Eastern Puerto Rico Out 10 Nm- 922 Pm Ast Thu Jul 29 2021
Rest of tonight..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Scattered showers late in the evening. Isolated Thunderstorms through the night.
Friday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 8 seconds. Scattered showers.
Friday night..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 8 seconds. Isolated showers.
Saturday..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 8 seconds. Isolated showers.
Saturday night..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Isolated showers.
Sunday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Isolated showers.
Monday..East winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 8 seconds. Scattered showers.
Tuesday..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 8 seconds. Isolated showers.
AMZ700 922 Pm Ast Thu Jul 29 2021
Synopsis for puerto rico and the uS. Virgin islands waters... Moderate to locally fresh east to southeast winds will prevail for the next several days producing choppy marine conditions mainly across the offshore waters. An easterly perturbation will promote Thunderstorms across the regional waters tonight, especially across the caribbean waters.


7 Day Forecast for Marine Location Near Culebra, PR
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location: 18.02, -64.67     debug


Area Discussion for - San Juan, PR
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FXCA62 TJSJ 300150 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 950 PM AST Thu Jul 29 2021

UPDATE.

TJSJ 30/00z sounding indicated abundant tropical moisture with a TPW of 2.09 inches. Winds continue from the east-southeast, and enough instability is present. Under the current wind pattern, most of the activity is expected across the windward portions of the islands and the Caribbean Waters later overnight.

AVIATION.

Mostly VFR conds will continue to prevail at all TAF sites. However, VCTS conditions are expected for TJSJ, TJPS, USVI and Leeward terminals through 30/14Z. Afternoon convection will result in VCSH, POSSIBLY vcts, for TJSJ/TJBQ between 30/16-23Z. This may result in brief MVFR conditions. Winds out of the E at 5 to 15 knots overnight, increasing to 10-20 knots with sea breeze variation and higher gusts after 30/14Z.

MARINE.

Local nearshore buoys indicated seas between 3 and 4 feet and between 4 and 6 feet across the offshore buoys. Winds will continue from the east to east-southeast between 10 and 20 knots.

PREV DISCUSSION. /issued 446 PM AST Thu Jul 29 2021/

SYNOPSIS .

A TUTT Low will continue to enhance showers and thunderstorms, especially across the local waters tonight. A mid-level ridge will displace this TUTT-low early Friday, and it will hold aloft through early next week. A wind surge associated with Saturday's tropical wave will reach the islands tomorrow. The bulk of Saturday's wave moisture will remain well south across the Caribbean Waters, while PR/USVI can expect a drier air mass with Saharan Dust Particles.

SHORT TERM . Tonight through Sunday .

A TUTT-low will enhance an easterly perturbation across the islands tonight. As a result, showers and thunderstorms will affect portions of the local waters, the U.S. Virgin Islands, and PR's eastern, northern, and southern sections. Periods of moderate to heavy showers could produce ponding of water in roads and low- lying areas.

Moisture will slowly erode tomorrow ahead of the next tropical wave, which should arrive first as a wind surge around Friday afternoon, then a drier air mass will reach by late tonight into the weekend. This dry air mass will be accompanied by African Dust particulate, while the wave's bulk of moisture should remain well south of the islands across the Caribbean Sea. A mid-level ridge is another factor that will limit widespread shower activity during the weekend, and most of the action will be confined across the western sections of the islands and downwind from the Yunque.

LONG TERM . Sunday through Friday . from previous discussion .

A drier air mass with saharan Dust particles will continue to move over the forecast area on Sunday. As a result, fair weather conditions with hazy skies are expected to prevail for the first day of the long term forecast (Sunday). Tuesday now looks like it has better potential for shower development. First, the surface high pressure across the central Atlantic is expected to induce a southeasterly component in the winds over the forecast area. As a result, this wind flow will drag some patches of moisture with precipitable water above normal. Meanwhile, at the upper levels, the ECMWF and GFS model guidance is suggesting a Tropical Upper Tropospheric Trough (TUTT) moving westward into the local area, which will help increase thunderstorm potential. At this time, the models kind of agree in the timing of the most unstable conditions over the region. That said, expect morning showers over the eastern sections of Puerto Rico and the U.S. Virgin Islands. Then, in the afternoon hours, Galvez- Davison index suggest the possibility of scattered thunderstorms across northwestern quadrant of Puerto Rico. Confidence in the forecast is moderate, but still a few days to follow the dynamics in the upper levels and the moisture content.

For Wednesday onward, a rainy pattern is expected. On Wednesday, several patches of moisture are expected to filter into the region. The combination of the available moisture with the local effects and the upper level dynamics, will result in afternoon convection over the western sections of Puerto Rico, while isolated to scattered showers are expected elsewhere. On Thursday morning, a slot of dry air will move over the area, limiting the shower activity, but after that, in afternoon hours, a tropical wave is expected to increase the potential for shower activity once again through Friday. As a result, shower development is expected, mainly over the northwestern quadrant of Puerto Rico and the San Juan metro area each day.

AVIATION .

Mostly VFR conds will continue to prevail at all TAF sites with SHRA/VCTS expected across NW-PR and portions of the San Juan Metro Area through 29/22z. Therefore, SHRA/VCTS in and around JBQ/JSJ will remain possible this afternoon. Winds will be from the east to southeast up to 20 kts with higher gusts and sea breeze variations, becoming at 10 knots or less overnight.

MARINE .

Across the regional waters, choppy marine conditions will prevail over the next several days due to winds up to 20 kts. Seas of up to 5 feet will prevail across the regional waters for the next several days. For beachgoers, there is a moderate risk of rip currents for the northern and southeastern beaches of Puerto Rico as well most of the beaches of Culebra, Vieques and Saint Croix.

Thunderstorms will develop across the local waters, especially over the Caribbean Offshore waters overnight. Mariners should exercise caution.

PRELIMINARY POINT TEMPS/POPS. SJU 78 88 79 88 / 50 30 20 10 STT 79 89 80 89 / 40 20 20 20

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

SHORT TERM . CVB LONG TERM . CAM PUBLIC DESK . ERG


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
41052 - South of St. John, Virgin Islands 17 mi60 min E 14 G 16 84°F 83°F3 ft1017.1 hPa (+1.5)
CHSV3 - 9751364 - Christiansted Harbor, Virgin Islands 19 mi42 min ENE 2.9 G 4.1 84°F 84°F1018.2 hPa
LAMV3 21 mi42 min 83°F
LTBV3 - 9751401 - Lime Tree Bay, VI 23 mi42 min E 7 G 8.9 83°F 85°F1019.1 hPa
CHAV3 - 9751639 - Charlotte Amalie, VI 25 mi42 min 82°F 1018.3 hPa
CLBP4 - 9752235 - Culebra, PR 39 mi42 min 83°F 85°F1018.2 hPa
ESPP4 - 9752695 - Esperanza, PR 43 mi42 min E 8.9 G 13 1018.3 hPa
41056 45 mi60 min E 12 G 16 83°F 83°F3 ft1017.2 hPa (+1.5)

Wind History for Christiansted Harbor, St Croix, VI
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Airport Reports
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Tide / Current Tables for Christiansted Harbor, St Croix, Virgin Islands
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Tide / Current data from XTide NOT FOR NAVIGATION
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Tide / Current Tables for Benner Bay, St. Thomas, Virgin Islands
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Benner Bay
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Thu -- 12:44 AM AST     0.69 feet High Tide
Thu -- 05:56 AM AST     Sunrise
Thu -- 08:06 AM AST     0.24 feet Low Tide
Thu -- 10:54 AM AST     Moonset
Thu -- 02:14 PM AST     0.45 feet High Tide
Thu -- 06:39 PM AST     0.37 feet Low Tide
Thu -- 06:54 PM AST     Sunset
Thu -- 11:06 PM AST     Moonrise
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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GEOS Local Image of Puerto Rico    EDIT
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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