Thursday, July29, 2021
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Marine Weather and Tides
Cataño, 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 6:00AMSunset 7:01PM Thursday July 29, 2021 12:34 PM AST (16:34 UTC) Moonrise 11:12PMMoonset 10:59AM Illumination 72% 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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AMZ712 Coastal Waters Of Northern Puerto Rico Out 10 Nm- 955 Am Ast Thu Jul 29 2021
Rest of today..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Scattered showers through the day. Isolated Thunderstorms in the afternoon.
Tonight..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Isolated showers in the evening, then isolated Thunderstorms after midnight.
Friday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Isolated showers.
Friday 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 through the night.
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.
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..Southeast winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 8 seconds. Scattered showers.
AMZ700 955 Am 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 over offshore atlantic waters. A weak trough will continue to promote showers and isolated Thunderstorms across the regional waters today. Relatively tranquil marine conditions will prevail across the local waters this upcoming weekend.


7 Day Forecast for Marine Location Near Cata�o, PR
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location: 18.46, -66.12     debug


Area Discussion for - San Juan, PR
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FXCA62 TJSJ 291428 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 1028 AM AST Thu Jul 29 2021

UPDATE. The forecast is on track and no changes where made to the forecast during the morning update. Showers affected the eastern and northern areas of Puerto Rico early this morning and produced light rainfall amounts. GOES-16 satellite imagery shows a line of clouds moving across the interior areas of Puerto Rico, the line of clouds or sea-breeze will cause showers and isolated thunderstorms over portions of western, interior, and northwestern Puerto Rico later today. Currently, temperatures across the metro areas of San Juan are near the middle 80s, this afternoon daytime high temperatures are forecast to reach the lower 90s in lower elevations due the southerly wind flow.

AVIATION. VFR conds will continue through 29/16z across all terminal sites. SHRA/VCTS are expected across NW-PR and could affect terminal TJBQ by 29/17Z with SHRA/VCTS diminishing by 30/00Z. SHRA/VCTS are possible across E PR and USVI terminals by 30/03 due to increasing moisture. Winds will be from the east to southeast up to 20 kts with higher gusts and sea breeze variations.

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.

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

SYNOPSIS . A Tropical Upper Tropospheric Trough (TUTT) currently moving over the local area will continue to result in shower activity over the region. A dry pattern is expected for this weekend, due to an increase in drier air and Saharan dust particles, and a mid to upper level ridge moves over the forecast area.

SHORT TERM . Today through Saturday .

Near normal moisture is expected in the morning, but a patch of drier air with some minor concentrations of Saharan Dust will move in during the late morning into the afternoon hours. However, starting late this afternoon and tonight, a tropical wave will move in and will bring deeper moisture. The overall wind flow will shift to a more SE direction as the day progresses. There is also a TUTT passing through the local area, which could help promote thunderstorm development this afternoon. So given the current and expected pattern, scattered showers are expected in the morning across the local islands, isolated thunderstorms could start developing late in the morning and into the afternoon hours. The northwestern municipalities of PR have the highest chance of thunderstorms this afternoon. Also, showers and thunderstorms expected tonight into Friday morning, as the TUTT interacts with the tropical wave that will cause the increase in moisture. This increase in activity will be generally across the Caribbean waters, south and eastern PR and around the USVI. The SE winds could cause warmer than normal temperatures for the northern sections of PR today.

For Friday and Saturday, the shower activity is expected to be more modest, with locally induced afternoon showers across W/NW PR on Friday, with isolated to scattered showers elsewhere through the day. Even less shower activity is expected on Saturday across the local area. Much drier air is expected to move in with a higher concentration of Saharan dust. For that reason, very limited shower activity is expected. The model guidance also is suggesting daytime temps in the 90s for Saturday.

LONG TERM . Sunday through Friday .

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 . VCSH expected across the local terminals today as SCT SHRA affect the local area. However, TSRA is expected across NW-PR this afternoon, which could affect the actual TJBQ terminal, but VCTS on TAF due to some uncertainty on exact timing. Winds will be from the east at around 10KT or less through 29/13Z, but will increase to around 15KT with gusts up to 25KT and sea breeze variations thereafter.

MARINE . Across the regional waters, tranquil marine conditions with 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.

PRELIMINARY POINT TEMPS/POPS. SJU 90 78 88 79 / 50 50 30 20 STT 87 79 89 80 / 40 40 20 20

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

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
41053 - San Juan, PR 1 mi34 min E 14 G 18 83°F 83°F3 ft1016.8 hPa (+0.0)
41121 31 mi38 min 83°F3 ft
AROP4 - 9757809 - Arecibo, PR 31 mi52 min ENE 7 G 16 84°F
JOXP4 - Jobos Bay Reserve, Puerto Rico 35 mi49 min E 5.1 88°F 1019 hPa74°F
41056 37 mi34 min E 14 G 16 83°F 83°F3 ft1016.7 hPa (+0.0)
ESPP4 - 9752695 - Esperanza, PR 43 mi46 min ESE 11 G 14 1018 hPa
CLBP4 - 9752235 - Culebra, PR 45 mi46 min 89°F 84°F1017.8 hPa
42085 - Southeast of Ponce, PR 46 mi34 min E 16 G 19 84°F 3 ft1017.1 hPa (+0.4)

Wind History for San Juan, PR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Juan, Luis Munoz Marin International Airport, PR7 mi98 minE 1710.00 miA Few Clouds88°F75°F66%1017.9 hPa

Link to 5 minute data for TJSJ

Wind History from JSJ (wind in knots)
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Last 24hrE10E14E19
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E16E15E9E8E4E4E6E4SE4SE4SE3E6E4SE3E3E7E11E14E17E16
1 day agoNE13E12
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NE13E13NE10NE12NE10E11E9NE11E11E7SE3CalmE6CalmCalmCalmS34E13
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2 days agoE14E15E14E14NE17E10E10E10E7E5E4SE3E3S3E4E5E4SE3SE3E9E12NE14NE14
G20
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Tide / Current Tables for San Juan, Puerto Rico (3)
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San Juan
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Thu -- 12:44 AM AST     1.49 feet High Tide
Thu -- 06:01 AM AST     Sunrise
Thu -- 07:14 AM AST     0.26 feet Low Tide
Thu -- 10:59 AM AST     Moonset
Thu -- 01:22 PM AST     1.23 feet High Tide
Thu -- 07:00 PM AST     Sunset
Thu -- 07:13 PM AST     0.42 feet Low Tide
Thu -- 11:11 PM AST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.41.51.41.20.90.60.40.30.30.50.70.91.11.21.21.10.90.70.50.40.50.60.81

Tide / Current Tables for Boca De Cangrejos, Isla Verde, San Juan, Puerto Rico
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Boca De Cangrejos
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Thu -- 12:57 AM AST     1.23 feet High Tide
Thu -- 06:00 AM AST     Sunrise
Thu -- 07:22 AM AST     0.20 feet Low Tide
Thu -- 10:58 AM AST     Moonset
Thu -- 01:32 PM AST     1.07 feet High Tide
Thu -- 06:59 PM AST     Sunset
Thu -- 07:29 PM AST     0.32 feet Low Tide
Thu -- 11:10 PM AST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.21.21.210.70.50.30.20.20.30.50.80.91.11.110.80.60.40.30.30.40.60.8

Weather Map
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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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