Thursday, September23, 2021
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Marine Weather and Tides
Las Marías, 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 6:16AMSunset 6:24PM Thursday September 23, 2021 1:53 PM AST (17:53 UTC) Moonrise 8:19PMMoonset 8:24AM Illumination 95% Phase: Waning Gibbous; Moon at 17 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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AMZ742 Coastal Waters Of Northwestern Puerto Rico Out 10 Nm- 1000 Am Ast Thu Sep 23 2021
Rest of today..South winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Isolated showers.
Tonight..Southeast winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 12 seconds. Isolated showers.
Friday..South winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 12 seconds. North swell around 4 feet in the afternoon. Isolated showers through the day.
Friday night..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 11 seconds. North swell around 4 feet in the evening. Isolated showers.
Saturday..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 11 seconds. Isolated showers.
Sunday..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 11 seconds. Isolated Thunderstorms, then isolated showers.
Monday..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 10 seconds. Isolated showers.
AMZ700 1000 Am Ast Thu Sep 23 2021
Synopsis for puerto rico and the uS. Virgin islands waters... Light southerly winds will become more southeasterly into the end of the week. Some choppy conditions will persist today through Friday for portions of the waters, mostly in the offshore atlantic waters. Isolated to scattered showers are expected across the local waters through most of the week.


7 Day Forecast for Marine Location Near Las Mar�as, PR
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location: 18.22, -67     debug


Area Discussion for - San Juan, PR
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FXCA62 TJSJ 230838 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 438 AM AST Thu Sep 23 2021

SYNOPSIS.

Drier, less active weather will continue into the end of the week, as will warmer than average temperatures. Moisture is expected to arrive late Friday night and linger through the weekend, which will bring an increase in shower activity.

SHORT TERM. Today through Saturday .

At 4 AM AST a few showers had returned to mainland Puerto Rico as an area of widely scattered showers dissipated as it moved onshore in southern Puerto Rico. Other showers were present in the local waters, while a few lightning strikes were recorded north of the area, north of 20 north. The area of best moisture continues to move slowly north in association with the remnant low that was Tropical Depression Peter and that boundary is just inside the outer northern boundary of our forecast area. A tropical upper tropospheric trough is over the Windward Passage and is pulling northeastward as upper level high pressure keeps a firm grip on the local area. Columnar moisture is weakest over and south of the local Caribbean waters. A band of better moisture extends southeast out of the mass of moisture from the remnants of Tropical Depression Peter and is expected to move into the area from the southeast with the 1000-700 mb flow Friday morning and completely over Puerto Rico by Saturday afternoon. 500 mb temperatures will continue to decrease during the period such that showers and isolated thunderstorms will occur-- mainly over interior Puerto Rico--with increasing intensity and probability each successive day. Moisture is patchy however, so widespread shower are not expected over the area, rather, scattered showers mainly during the afternoons and some isolated nighttime activity. Since rainfall during the day on Wednesday was considerably less than what fell on Tuesday, rivers and streams subsided and urban and small stream flooding did not occur during the daytime Wednesday. Some urban and small stream flooding may occur in Central Puerto Rico each day during the short term period, however.

LONG TERM. Sunday through Thursday .

Slight changes in seasonal weather pattern are around the corner. Throughout the long term period, a polar trough is forecast to build and exit the Eastern Seaboard, move eastward and stall northwest of the forecast area between Sunday through midweek. The trough, although deep, is not expected to fully reach the northeastern Caribbean. However, model guidance suggests the evolution of a series of short wave upper-level lows induced by the trough reaching or moving close to our area throughout this period. Although these lows seem weak, it will still provide somewhat favorable upper-level dynamics and instability aloft. An airmass of high moisture content across the area still persisting on Sunday and expected to linger through Monday will take advantage of this setup. Although mid levels will not be quite as moist with relative humidities between 50-60%, this will be sufficient for shower and thunderstorm activity to take place. Therefore, expect an increase in cloudiness along with showers and isolated thunderstorms throughout the day with the focus across eastern Puerto Rico, Vieques, Culebra and U.S. Virgin Islands in the morning. Later, activity will shift to the interior and, under an east southeasterly wind flow and sea breeze convergence, the northwestern quadrant of Puerto Rico in the afternoon. It is possible that this activity will continue throughout the night and early Monday morning as the bulk of moisture exists in the region.

Despite a gradual decrease in moisture through early Wednesday, low- levels will remain sufficiently moist for passing showers to develop each morning and, in combination with diurnal heating and local effects, produce rounds of showers and isolated thunderstorms across interior and western puerto Rico each afternoon. Urban and small stream flooding will remain possible in areas with the heaviest showers.

Forecast uncertainty remains from Wednesday onwards as it depends on the evolution of Tropical Depression Eighteen currently located close to 10N and 36W. The National Hurricane Center mentions favorable environmental conditions for strengthening with low shear, warm sea surface temperatures, and a moist unstable atmosphere along the path of the Tropical Depression. GFS ensembles are consistent with this strengthening maintaining the system northeast of the forecast area by late Wednesday. The ECMWF continues with its closer path to our region, but much weaker in intensity and slower, putting it close to the forecast area by Thursday. Therefore, confidence continues to remain low regarding the intensity and trajectory of this system. Additional information and updates on Tropical Depression Eighteen can be found in the public advisory (TCPAT3) and discussion (TCDAT3) issued by the National Hurricane Center.

AVIATION. Some MVFR conds with mtn obscurations are psbl aft 22/17Z in interior PR as sct SHRA/Isold TSRA dvlp across the area during max heating in southerly flow, but TAF sites are expected to remain VFR although some brief CIGs blo 3 kft may occur at TJBQ durg the pd. Sfc winds will be generally less than 10 kt except near TSRA and dominated by sea breezes in the southerly flow. Maximum winds WSW-W 20-25 kt btwn FL350-380 diminishing durg the day.

MARINE.

A slight increase in wave heights is possible tonight, associated with a weak northerly swell that is forecast to make its way into the region. Even so, seas of 5 feet or less are anticipated. There remain southerly winds over the area, up to 10 knots, becoming more southeasterly tonight into Friday.

PRELIMINARY POINT TEMPS/POPS. SJU 94 80 93 78 / 20 10 20 20 STT 88 82 89 80 / 10 20 20 20

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

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MGZP4 - 9759394 - Mayaguez, PR 8 mi54 min SW 12 G 14 87°F 87°F1011.6 hPa (-1.9)
MGIP4 - 9759110 - Magueyes Islands, PR 17 mi54 min SE 7 G 9.9 86°F 89°F1012 hPa (-1.6)
PTRP4 17 mi19 min SW 11 G 17 86°F
41115 - Rincon, Puerto Rico (181) 18 mi28 min 86°F3 ft
41121 24 mi58 min 86°F3 ft
AROP4 - 9757809 - Arecibo, PR 24 mi54 min NE 5.1 G 6 86°F
42085 - Southeast of Ponce, PR 35 mi54 min SSE 7.8 G 9.7 83°F 2 ft1012.5 hPa (-1.5)
JOXP4 - Jobos Bay Reserve, Puerto Rico 45 mi69 min ESE 1.9 87°F 1014 hPa76°F

Wind History for Mayaguez, PR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Aquadilla, Rafael Hernandez Airport, PR21 mi64 minWSW 9 G 1510.00 miFair90°F75°F63%1012.5 hPa

Link to 5 minute data for TJMZ

Wind History from JMZ (wind in knots)
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Last 24hr----------------------------------------E6E5E8E9
1 day ago------------------------------------------------
2 days ago------------------------------------------------

Tide / Current Tables for Mayaguez, Puerto Rico
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Mayaguez
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Thu -- 03:48 AM AST     0.42 feet Low Tide
Thu -- 06:17 AM AST     Sunrise
Thu -- 08:24 AM AST     Moonset
Thu -- 10:12 AM AST     1.74 feet High Tide
Thu -- 04:44 PM AST     0.57 feet Low Tide
Thu -- 06:23 PM AST     Sunset
Thu -- 08:19 PM AST     Moonrise
Thu -- 10:08 PM AST     1.33 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.10.90.60.50.40.50.81.11.41.61.71.71.51.310.80.60.60.70.91.11.21.31.3

Tide / Current Tables for Puerto Real, Puerto Rico
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Puerto Real
Click for Map
Thu -- 03:43 AM AST     0.30 feet Low Tide
Thu -- 06:17 AM AST     Sunrise
Thu -- 08:24 AM AST     Moonset
Thu -- 10:09 AM AST     1.27 feet High Tide
Thu -- 04:39 PM AST     0.41 feet Low Tide
Thu -- 06:23 PM AST     Sunset
Thu -- 08:19 PM AST     Moonrise
Thu -- 10:05 PM AST     0.96 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.80.60.40.30.30.40.60.811.21.31.21.10.90.70.50.40.40.50.60.80.910.9

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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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