Monday, September20, 2021
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Marine Weather and Tides
Jagual, 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 6:12AMSunset 6:23PM Monday September 20, 2021 2:23 AM AST (06:23 UTC) Moonrise 6:29PMMoonset 5:48AM Illumination 98% Phase: Waxing Gibbous; Moon at 14 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- 925 Pm Ast Sun Sep 19 2021
Rest of tonight..Northeast winds 5 to 10 knots. Seas 2 feet or less. Dominant period 8 seconds. Isolated showers through the night.
Monday..East winds 5 to 10 knots. Seas 2 feet or less. Dominant period 8 seconds. Scattered showers through the day. Isolated Thunderstorms in the afternoon.
Monday night..North winds 5 to 10 knots. Seas 2 feet or less. Dominant period 8 seconds. Isolated Thunderstorms in the evening. Scattered showers through the night.
Tuesday..West winds 5 to 10 knots backing southwest in the afternoon. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Numerous showers through the day. Isolated Thunderstorms in the afternoon.
Tuesday night..Southeast winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Scattered showers.
Wednesday..Southeast winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 8 seconds. Scattered showers.
Thursday..East winds 5 to 10 knots. Seas 2 feet or less. Dominant period 8 seconds. Isolated showers.
Friday..East winds 5 to 10 knots. Seas 2 feet or less. Dominant period 8 seconds. Isolated showers.
AMZ700 925 Pm Ast Sun Sep 19 2021
Synopsis for puerto rico and the uS. Virgin islands waters... Gentle to moderate east to northeast trade winds will prevail through at least Monday. Seas of 4 feet or less are expected across the local waters through tonight. Deteriorating marine conditions, due to the passage of tropical storm peter well northeast of the local islands, are expected by early in the week, mostly for the offshore atlantic waters into the anegada passage. An increase in shower and Thunderstorm activity is also expected tonight through Tuesday.


7 Day Forecast for Marine Location Near Jagual, PR
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location: 18.1, -66     debug


Area Discussion for - San Juan, PR
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FXCA62 TJSJ 200147 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 947 PM AST Sun Sep 19 2021

UPDATE. Showers and thunderstorms affected many sectors of PR this afternoon, particularly the interior into southern PR. However, shortly after sunset, the shower activity over PR quickly started to diminish. That said, the TUTT just to our north, combined with the increase in moisture associated with the Tropical Storm Peter which is hundreds of miles to the east of the local islands, is causing some thunderstorms over the local waters, some of which are very close to the USVI, especially close to the northern islands. The showers and thunderstorms resulting from this TUTT are expected to continue over the local waters tonight, some of them affecting the USVI briefly as well as eastern PR. This TUTT is expected to meander over the area early this week, which will interact with the deep moisture and possibly the outer bands of Peter, to cause numerous showers and a few thunderstorms over the local area early this workweek.

AVIATION. VFR conds expected through the forecast period. SCT SHRA /ISOL TSRA over the local area will cause VCSH/VCTS across most of the local terminals tonight, except TJPS. That said, brief -SHRA could be observed at the terminals themselves, but no significant change in flight category is expected. Winds will be mainly from the N-NE through the forecast period at 10KT or less, becoming light and variable late tonight, and increasing up to 10KT 20/13Z. SE winds expected at TJPS after 20/14Z.

MARINE. No major changes in the marine forecast. Seas are still expected to be 4 ft or less tonight, increasing to 7FT on Monday afternoon. There is a small craft advisory from Monday afternoon to late Tuesday night.

PREV DISCUSSION. /issued 433 PM AST Sun Sep 19 2021/

SYNOPSIS .

Increasingly active weather is expected for the early part of the workweek. Moisture is increasing across the region, associated with the approach and passage of Tropical Storm Peter well to our northeast, while troughing aloft is providing instability. Drying is expected around midweek.

SHORT TERM . Tonight through Tuesday .

Moisture will increase across the region tonight, associated with Tropical Storm Peter, which is passing by well to our northeast. The area of enhanced moisture is evident on Total Precipitable Water imagery from GOES-16, with PWAT of around 2 inches in the northeastern part of the CWA, over the water. The TUTT remains in the vicinity of the islands, with induced troughing into the lower levels, which provides continuing instability for the region. This will support the increasingly active weather that we have been seeing today, continuing into the start of the workweek.

The combination of mid-level troughing that is forecast to persist over the region, and good tropical moisture from off of the tropical cyclone (despite its distance from the region) will lead to enhanced convection over the region through Tuesday. Thunderstorms are possible over the waters overnight, occasionally pushing onshore in windward portions of the islands. Local effects will still dominate the forcing behind convective initiation, and a typical pattern will be maintained during the afternoon. East-northeasterly flow on Monday will lead to the bulk of the afternoon showers and thunderstorms being in western/southwestern and interior Puerto Rico. On Tuesday, the flow is likely to be weaker and vaguely southerly, which is likely to lead to widespread activity for interior and northern Puerto Rico.

LONG TERM . Wednesday through Sunday . From Prev Discussion .

Tropical Storm Peter is expected to pull away from the area on a generally northwesterly course Wednesday through Friday with some moisture trailing, but just as a ribbon of drier air from subsidence preceded it another ribbon of drier air is expected to follow on Wednesday night. Then alternating wet and dry bands will pull through the area in predominantly southeasterly flow through the end of the period. The GFS shows considerable warming that actually begins today but will reach a peak on Wednesday such that the 1000-850 mb thicknesses move from 1415 meters today to 1426 meters on Wednesday. Thicknesses are not forecast to drop below this Tuesday's level through the next 240 hours even though winds will gradually become east northeasterly again after Sunday. 500 mb temperatures however will begin to fall again on Wednesday and by saturday conditions will be favorable for isolated to scattered thunderstorms in the western and interior portions of Puerto Rico each afternoon, and likely a few thunderstorms over the local waters afterward during the evenings.

AVIATION .

Mainly VFR conditions expected for all TAF sites. Afternoon convection will result in VCSH for TJPS and TJSJ. Shower activity is expected to increase across the eastern PR and USVI terminals after 19/19z, resulting -SHRA and VCTS for TISX,TIST,TNCM and TKPK through the rest of the period. Winds continue from the E-ENE between 10 and 15 kts with sea breeze variations through 19/22z, diminishing to less than 10 kts overnight.

MARINE .

Conditions remain relatively tranquil overnight tonight into early tomorrow morning across the local waters, with seas generally 4 feet or less, with winds out of the east at up to 15 knots.

Deteriorating conditions are expected tomorrow, associated with the passage of Tropical Storm Peter well to the northeast of our region. This system will bring some building seas to the local waters, with the most significant impacts for the offshore Atlantic waters and into the Anegada Passage - this is also for where the Small Craft Advisories have been issued, which start during the afternoon tomorrow. There remains a little bit of uncertainty with respect to the timing and magnitude of this increase in seas, largely due to uncertainties with respect to the track of the system. The GFS is a little further south and faster to the west than the Euro and the official forecast issued by the National Hurricane Center. This solution cannot be ruled out, and a trend towards the GFS would tend to lead to the more significant impacts starting a little sooner. The current forecast takes this into account. Should the forecast verify well/better than the GFS does, then the deteriorating conditions could be delayed by a few hours, and may not be as substantial, especially further into the local waters. This could lead to a briefer period of hazardous conditions, and for the Anegada Passage, especially, as could a trend towards more quickly progressing westward. On the whole, very minor changes in the forecast for this system could lead to significant changes in the expectations with respect to hazardous marine conditions for our local waters. Anyone with interests in these areas should monitor closely future forecasts and discussions - both the Coastal Waters Forecast (CWF) from this office and the official forecast for TS Peter from the National Hurricane Center (NHC), as well as hazard messages including the Marine Weather Message (MWW) - for any potential changes.

PRELIMINARY POINT TEMPS/POPS. SJU 78 88 78 89 / 70 60 60 70 STT 77 91 79 87 / 70 70 70 70

SJU WATCHES/WARNINGS/ADVISORIES. PR . None. VI . None. AM . Small Craft Advisory from 2 PM Monday to 8 AM AST Tuesday for Anegada Passage Southward to 17N.

Small Craft Advisory from 2 PM Monday to 2 AM AST Wednesday for Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N.



SHORT TERM . JA LONG TERM . CS PUBLIC DESK . RVT


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
JOXP4 - Jobos Bay Reserve, Puerto Rico 15 mi98 min Calm 77°F 1013 hPa73°F
41053 - San Juan, PR 26 mi83 min E 9.7 G 12 78°F 85°F3 ft1012.4 hPa (-0.3)
SJNP4 - 9755371 - San Juan, PR 26 mi53 min ENE 12 G 16 78°F 85°F1012.5 hPa
41056 31 mi83 min NE 14 G 18 80°F 85°F3 ft1010.8 hPa (-0.4)
42085 - Southeast of Ponce, PR 32 mi83 min NW 3.9 G 3.9 82°F 1 ft1012.2 hPa (-0.7)
CLBP4 - 9752235 - Culebra, PR 40 mi53 min 78°F 86°F1011.7 hPa
41121 46 mi57 min 85°F3 ft
AROP4 - 9757809 - Arecibo, PR 46 mi53 min S 5.1 G 5.1 84°F

Wind History for Yabucoa Harbor, PR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Juan, Luis Munoz Marin International Airport, PR23 mi27 minN 010.00 miPartly Cloudy78°F74°F87%1011.5 hPa

Link to 5 minute data for TJSJ

Wind History from JSJ (wind in knots)
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Last 24hrS3SE3CalmCalmCalmS3E3CalmNE12E13NE14NE11
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1 day agoCalmCalmCalmCalmCalmS3N5E8NE11E7NE10NE11
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2 days agoE7CalmS3SE4S3S3E6E8E15E13NE16NE15
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Tide / Current Tables for Puerto Maunabo, Puerto Rico
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Puerto Maunabo
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Mon -- 12:20 AM AST     0.53 feet Low Tide
Mon -- 05:47 AM AST     Moonset
Mon -- 06:12 AM AST     Sunrise
Mon -- 07:43 AM AST     0.81 feet High Tide
Mon -- 12:40 PM AST     0.26 feet Low Tide
Mon -- 06:21 PM AST     Sunset
Mon -- 06:28 PM AST     Moonrise
Mon -- 07:54 PM AST     Full Moon
Mon -- 08:59 PM AST     0.75 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.50.60.60.60.70.80.80.80.70.60.40.30.30.30.30.40.50.60.70.70.70.70.6

Tide / Current Tables for Vieques Passage, Puerto Rico Current
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Vieques Passage
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Mon -- 01:07 AM AST     -0.00 knots Slack
Mon -- 04:26 AM AST     -0.73 knots Max Ebb
Mon -- 05:46 AM AST     Moonset
Mon -- 06:11 AM AST     Sunrise
Mon -- 07:44 AM AST     0.00 knots Slack
Mon -- 10:43 AM AST     0.62 knots Max Flood
Mon -- 01:45 PM AST     -0.00 knots Slack
Mon -- 04:52 PM AST     -0.64 knots Max Ebb
Mon -- 06:20 PM AST     Sunset
Mon -- 06:27 PM AST     Moonrise
Mon -- 07:54 PM AST     Full Moon
Mon -- 08:00 PM AST     0.00 knots Slack
Mon -- 10:59 PM AST     0.59 knots Max Flood
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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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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