Monday, September27, 2021
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Marine Weather and Tides
Aguas Claras, 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 6:11AMSunset 6:15PM Monday September 27, 2021 2:04 AM AST (06:04 UTC) Moonrise 10:56PMMoonset 11:42AM Illumination 67% 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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AMZ725 Coastal Waters Of Southern Usvi Vieques And Eastern Puerto Rico Out 10 Nm- 924 Pm Ast Sun Sep 26 2021
Rest of tonight..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 11 seconds. Scattered showers.
Monday..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 11 seconds. Scattered showers through the day.
Monday night..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 11 seconds. Scattered showers.
Tuesday..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 11 seconds. Scattered showers.
Tuesday night..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 11 seconds. Scattered showers.
Wednesday..Northeast winds 5 to 10 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 11 seconds. East swell 4 to 5 feet. Scattered showers.
Thursday..Southeast winds 5 to 10 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 11 seconds. Northeast swell 4 to 5 feet. Scattered showers.
Friday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 11 seconds. Northeast swell around 4 feet. Scattered showers.
AMZ700 924 Pm Ast Sun Sep 26 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.


7 Day Forecast for Marine Location Near Aguas Claras, PR
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location: 18.23, -65.62     debug


Area Discussion for - San Juan, PR
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FXCA62 TJSJ 270048 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 848 PM AST Sun Sep 26 2021

UPDATE. Afternoon convection across Puerto Rico continued into the evening hours, as the showers and thunderstorms developed and moved across the coastal areas along portions of the north central and south coastal areas. Expect most of this activity to continue to diminish and dissipate during the next hour or so. For the rest of the overnight hours, skies will become mostly clear to partly cloudy over land. However, some passing showers may still reach parts of the north and east coastal areas from time to time into the early morning. Recent TJSJ 27/00Z upper air sounding suggests light east to northeast winds in the low levels, then slightly increasing and becoming northerly in the mid to upper levels, as the upper ridge continued to erode. Layered moisture was mainly in the low levels, below 700 millibars with dry conditions aloft. No changes to the inherited short term forecast and reasoning at this time.

AVIATION UPDATE. Prevailing VFR durg rest of prd. Except for in VCTY of SHRA/Isold TSRA ovr N and S coastal areas of PR. SCT ocnl Bkn lyrs nr FL025 . FL050 over regional water and en route btw islands with Wdly SCT SHRA. Sfc wnds light and variable overnight bcmg fm the E at 10-15 kts aft 27/14Z with sea breeze variations. No sig operational wx impacts durg the rest of period at this time.

MARINE UPDATE. No change to the previous marine discussion at this time. Overall Seas will continue at 4 feet or less with light easterly winds between 5 to 10 knots overnight.

PREV DISCUSSION. /issued 400 PM AST Sun Sep 26 2021/

SYNOPSIS . The mid to upper-level ridge will continue to weaken over the area as an upper-level trough deepens to the west of Puerto Rico. During the afternoon showers and isolated thunderstorms will develop due to the local sea breeze and surface heating. Light steering winds will cause showers and thunderstorms to move slowly which could lead to urban and small stream flooding in flood prone areas. Wednesday, marine conditions across the outer Atlantic waters will deteriorate and become hazardous due to Hurricane Sam.

SHORT TERM . Tonight through Tuesday . A tropical wave currently in the southern Caribbean waters is providing some low-level moisture and meager instability over the region. This afternoon the sea breeze, significant heating, and moisture convergence has yielded showers and isolated thunderstorms across the interior, western, and eastern areas of Puerto Rico. Similar to yesterday, light low-level and mid-level winds will cause convection to drift slowly this afternoon, thus leading to urban and small stream flooding. Rainfall amounts could range from one to two inches with isolated three inches.

Monday and Tuesday, An upper-level trough over the western Atlantic will continue to weaken the surface and mid-level ridge over the region. The weakening of the ridges will allow moisture to filter to the mid- levels of the atmosphere and further aid in the vertical development of showers during the afternoon on Tuesday and Wednesday. The GFS shows Tuesday, as the best day for area wide rainfall and robust shower activity. The GFS has relative humidity values greater than 50 percent throughout the atmospheric column, which supports development of deep convection. Winds are expected to remain relatively light with winds ranging from 5 to 10 mph. The light wind flow will likely cause urban and small stream flooding especially for areas that are flood prone.

PREV DISCUSSION . /issued 453 AM AST Sun Sep 26 2021/

LONG TERM . Wednesday through Monday . On Wednesday, patches of moisture will remain over the region; these patches are expected to have near-normal moisture content, with PWATs of 1.8 to 2.1 inches. These patches will help to sustain shower activity across the region. Additionally, troughing is forecast in the mid-levels, with a large upper-level trough extending from around the Gulf of St. Lawrence to just west of the region. This will also support convective development over the region. As such, relatively active weather is expected during the day on Wednesday. Forecast confidence is high, but will rapidly fall off as we move into Thursday.

For the second half of the week, conditions across the region will depend heavily on the track of Hurricane Sam. The system is forecast to track by the region well to the northeast; direct impacts presently appear quite unlikely. However, bands of moisture associated with this system, pulling moisture up from the south, could affect the region, especially for late Thursday into Friday. Minor changes in the trajectory of the hurricane could greatly impact whether or not additional moisture makes its way into the region, as well as how much. As has been the case throughout, the GFS has Hurricane Sam tracking further away from the local islands, while the ECMWF has a somewhat closer track - these two tracks lie on either side of the official track from the NHC. The Euro brings more moisture into the region than does the GFS, which keeps the area relatively dry through the end of the workweek. Looking at the CMC, which takes Sam closer to the official forecast track, additional moisture makes its way into the area, bringing PWAT values to near or above normal levels for Friday afternoon. With all of this in mind, the forecast reflects additional moisture over the region, moreso for Friday than Thursday. Considering additional impacts small changes in the trajectory could have on the region, in the form of wind direction, there is also uncertainty with the location of precipitation maxima, even if the moisture materializes as anticipated. As such, the forecast confidence through the end of the workweek is low.

On Saturday, a tropical wave is forecast to arrive, bringing increased moisture to the region, likely starting during the second half of the day. This moisture will traverse the region through the night and into Sunday morning. Active weather is expected, with shower activity in a typical pattern. Lingering moisture is expected to persist over the region on Sunday, though the trend will be towards drying Sunday into Monday. Forecast confidence is low to average, considering potential uncertainty with the timing and the dynamics, due to the affects of Hurricane Sam in the vicinity.

AVIATION . VFR conditions will persist through the forecast period. SHRA/TSRA will develop across the interior and west PR thru 26/23z. This activity could impact terminals producing MVFR conds with mtn obscurations at times. Surface winds will continue from the ESE around 10 kt, with sea breeze variations. Winds will drop below 10 kt after 26/23z and will return from the E aft 27/13z.

MARINE . Relatively 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 90 77 89 / 40 30 30 20 STT 78 89 77 89 / 50 50 30 30

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

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
41056 9 mi65 min ENE 7.8 G 7.8 83°F 86°F2 ft1013.6 hPa (-0.4)
CLBP4 - 9752235 - Culebra, PR 18 mi47 min 81°F 86°F1015.2 hPa
41053 - San Juan, PR 30 mi65 min SSW 3.9 G 5.8 81°F 86°F3 ft1015.1 hPa (-0.4)
SJNP4 - 9755371 - San Juan, PR 31 mi47 min SW 2.9 G 4.1 81°F 87°F1015.6 hPa
CHAV3 - 9751639 - Charlotte Amalie, VI 38 mi47 min 82°F 1015.1 hPa
41052 - South of St. John, Virgin Islands 45 mi65 min NNE 7.8 G 9.7 84°F 86°F2 ft1014 hPa (-0.6)
LAMV3 48 mi53 min 78°F

Wind History for Fajardo, PR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Juan, Luis Munoz Marin International Airport, PR24 mi69 minN 010.00 miA Few Clouds82°F75°F79%1015.6 hPa

Link to 5 minute data for TJSJ

Wind History from JSJ (wind in knots)
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Last 24hrCalmS3CalmCalmCalmCalmCalmE6NE8NE7NE11NE12E15E12E15E12E11E8--E5E5E4S3Calm
1 day agoS3S3CalmCalmCalmCalmSW3S4CalmN7N8NE12NE12NE11NE13NE11E9E8E7E5E6SE4SE3Calm
2 days agoS4S4S3CalmS3CalmS4S3CalmN4NE7N11NE9N85N6NW5W3SW3SW4SW4CalmCalmCalm

Tide / Current Tables for Roosevelt Roads, Puerto Rico
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Roosevelt Roads
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Mon -- 12:14 AM AST     0.66 feet High Tide
Mon -- 06:12 AM AST     Sunrise
Mon -- 06:43 AM AST     0.19 feet Low Tide
Mon -- 11:42 AM AST     Moonset
Mon -- 01:51 PM AST     1.06 feet High Tide
Mon -- 06:14 PM AST     Sunset
Mon -- 08:57 PM AST     0.49 feet Low Tide
Mon -- 10:55 PM AST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.70.60.60.50.40.30.20.20.30.40.60.80.911.110.90.80.70.60.50.50.50.6

Tide / Current Tables for Vieques Passage, Puerto Rico Current (2)
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Vieques Passage
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Mon -- 01:04 AM AST     0.00 knots Slack
Mon -- 03:36 AM AST     0.37 knots Max Flood
Mon -- 06:12 AM AST     Sunrise
Mon -- 06:23 AM AST     -0.00 knots Slack
Mon -- 09:10 AM AST     -0.37 knots Max Ebb
Mon -- 11:42 AM AST     Moonset
Mon -- 11:48 AM AST     0.00 knots Slack
Mon -- 03:19 PM AST     0.61 knots Max Flood
Mon -- 06:14 PM AST     Sunset
Mon -- 06:32 PM AST     -0.00 knots Slack
Mon -- 10:05 PM AST     -0.70 knots Max Ebb
Mon -- 10:55 PM AST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.3-00.20.30.40.30.1-0.1-0.3-0.4-0.3-0.200.30.50.60.60.40.2-0.1-0.4-0.6-0.7-0.6

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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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