Tuesday, September28, 2021
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Marine Weather and Tides
Mayagüez, 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 6:17AMSunset 6:20PM Tuesday September 28, 2021 1:44 PM AST (17:44 UTC) Moonrise 11:51PMMoonset 12:41PM Illumination 52% Phase: Third Quarter Moon; Moon at 22 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- 1118 Am Ast Tue Sep 28 2021
Rest of today..South winds 5 to 10 knots backing northeast in the afternoon. Seas 1 to 3 feet. Dominant period 10 seconds.
Tonight..East winds 5 to 10 knots. Seas 2 feet or less. Dominant period 10 seconds. Isolated showers.
Wednesday..East winds 5 to 10 knots backing north in the afternoon. Seas 1 to 3 feet. Dominant period 10 seconds. Scattered showers through the day. Isolated Thunderstorms in the afternoon.
Wednesday night..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 10 seconds. Scattered showers through the night.
Thursday..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 10 seconds. Isolated showers.
Friday..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 12 seconds. Northeast swell 4 to 5 feet. Isolated Thunderstorms. Scattered showers.
Saturday..East 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. Isolated Thunderstorms.
AMZ700 1118 Am Ast Tue Sep 28 2021
Synopsis for puerto rico and the uS. Virgin islands waters... Light to gentle easterly winds, and seas of 5 feet or less will continue across the regional waters through Wednesday. Deteriorating and hazardous seas are expected by late Wednesday night through Friday, due to swells generated by major hurricane sam. The official forecast from the national hurricane center has sam passing well to the northeast of the islands by Thursday.


7 Day Forecast for Marine Location Near Mayag�ez, PR
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location: 18.22, -67.15     debug


Area Discussion for - San Juan, PR
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FXCA62 TJSJ 281603 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 1203 PM AST Tue Sep 28 2021

UPDATE. Fair weather prevailed for most of the morning across the local area, with only isolated showers across the local waters. Late in the morning, cloudiness started increasing across the southern slopes and central Puerto Rico. The shower activity is expected to gradually develop across these areas early in the afternoon, while scattered showers are developing across the Caribbean waters and near the USVI. Showers and thunderstorms are still expected across central and western PR, which may cause urban and small stream flooding. No changes were introduced to the forecast.

AVIATION. VFR conds expected to prevail across the local terminals. However, developing SHRA/TSRA could affect areas near the local terminals this afternoon. TJBQ has the highest chance of TSRA between 28/17 and 28/21, but it is also possible at the rest of the local terminals for brief periods. Winds will remain light and from the SE with sea breeze variations for the rest of the afternoon.

MARINE. Tranquil seas expected today, becoming choppy starting late tonight, and then hazardous starting late on Wednesday. This is due to a swell coming in from hurricane Sam, which is expected to remain hundreds of miles NE of the local islands. No changes in the marine forecast.

PREV DISCUSSION. /issued 415 AM AST Tue Sep 28 2021/

SYNOPSIS . Diurnally induced afternoon convection is expected to develop each day over portions of the interior of PR through the end of the week. An upper level trough west of the area will promote instability on Wednesday. Light steering winds will cause slow moving showers, increasing the potential for urban and small stream flooding. A tropical wave is forecast to increase moisture content through the weekend. Weather conditions are expected to improve early next week, due to a building ridge and drier air intrusion. Swells generated by Hurricane Sam will cause hazardous seas and rough surf conditions late in the workweek.

SHORT TERM . Today through Thursday .

Patches of moisture continue to filter in over the area from time to time. This morning, there is a patch making its way westward over the southern half of the CWA, and is presently located over/around St. Croix. Based on satellite estimates, this patch has precipitable water values in the neighborhood of 1.8 to 2.0 inches or more. There has been widespread isolated to scattered shower activity through the night, with stronger and more concentrated activity, as well as some thunderstorms, associated with this area of enhanced moisture. Occasional showers pushing onshore will continue this morning, with a typical pattern of shower activity dominating the region throughout the coming days. Steering flow remains light over the area; as such, showers will be generally slow-moving. Portions of interior Puerto Rico could see locally high rainfall amounts from afternoon convection because of this.

Aloft, conditions are becoming more favorable for supporting convective development, as the mid-level ridge continues to erode, giving way to some weak troughiness over the area today. Tomorrow, this increase in instability continues. A strong deep-layer trough extending south from over northern Quebec/Labrador this morning will gradually shift southward and then eastward, to be over New England/the Canadian Maritimes by Thursday, when it will begin slowly moving away. This trough will extend to just west of the region on Wednesday, supporting additional increases in instability, providing further support to convection over the region.

For Thursday, model guidance suggests decreasing moisture. There is a region of dry air just west to southwest of Hurricane Sam, as is visible on satellite imagery. It is likely that we will see at least some drying effects from this airmass during the storm's passage well to the northeast of the islands. That being said, there will be sufficient moisture in the low levels to support shower activity. The influence of Hurricane Sam will also lead to additional weakening of the steering flow over the area, and the trend continues - slow-moving showers largely affecting the interior of Puerto Rico during the afternoon causing locally significant rainfall, causing an enhanced risk for urban and small stream flooding.

Forecast confidence is generally high for today and tomorrow, but is lessened on Thursday, due to the impacts of Hurricane Sam's passage to the northeast.

LONG TERM . Friday through Tuesday .

As Hurricane Sam lifts further north on Friday, a low-level trough is forecast to develop over the area, and winds are expected to turn from the east-southeast, favoring diurnal convection along the interior and northern slopes of PR. Urban and small stream flooding can be expected with the heaviest showers. The weak southeasterly steering wind flow should promote warmer than normal temperatures. During the weekend, a tropical wave is forecast to cross the region, increasing moisture content and the areal coverage of showers across the islands with isolated thunderstorms expected to develop across the local waters and over portions of the islands each day. Therefore, the flood threat will remain elevated through the weekend.

Moisture content is expected to quickly erode by early next week, as a ridge builds from the east, promoting drier air and more stable conditions. However, typical afternoon convection cannot be ruled out over the western interior of PR, and from streamers downwind of the USVI. Moderate to fresh trade winds are expected to return during this period in response to the building ridge to our northeast.

AVIATION . Generally VFR conds are expected across all terminals for the next 24 hours. SHRA/TSRA activity near TISX has diminished, MVFR conds no longer likely. VCSH after 28/18Z for TJBQ; cannot entirely rule out VCTS, but most activity will likely be S/SE of terminal, outside of vicinity. Winds generally east to 10 to 12 knots, with sea breeze variations, after 28/14Z. Winds subside after sunset, becoming light.

MARINE . Seas up to 4 feet are expected to prevail today, gradually building between 6-8 feet by Thursday across the northern and eastern waters of the islands. Light trade winds will continue to prevail around 10 knots or less through much of the workweek. There is a low risk of rip currents across all the islands today, as the primary wave direction is from the east to southeast with the 4 ft seas across the Atlantic waters. However, deteriorating and hazardous seas are expected by late Wednesday night through Friday, due to swells generated by Hurricane Sam. These swells will also cause rough surf conditions and life-threatening rip currents along the east and north facing beaches of the islands.

PRELIMINARY POINT TEMPS/POPS. SJU 90 78 89 78 / 30 10 30 40 STT 88 78 88 77 / 20 30 30 40

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

SHORT TERM . JA 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 0 mi57 min WNW 6 G 9.9 88°F 88°F1012.3 hPa
PTRP4 11 mi40 min NNW 5.1 G 8.9 88°F
41115 - Rincon, Puerto Rico (181) 13 mi49 min 87°F2 ft
MGIP4 - 9759110 - Magueyes Islands, PR 18 mi183 min SE 8.9 G 11 87°F 89°F1013.7 hPa
41121 30 mi49 min 86°F3 ft
AROP4 - 9757809 - Arecibo, PR 30 mi57 min ENE 5.1 G 9.9 86°F
42085 - Southeast of Ponce, PR 41 mi45 min ESE 9.7 G 12 85°F 2 ft1012.6 hPa (-1.4)
MISP4 - 9759938 - Mona Island, PR 43 mi57 min 86°F 87°F1013.7 hPa

Wind History for Mayaguez, PR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Aquadilla, Rafael Hernandez Airport, PR19 mi55 minENE 910.00 miFair88°F73°F62%1013.5 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------------------------------------------------
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Tide / Current Tables for Mayaguez, Puerto Rico
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Mayaguez
Click for Map
Tue -- 12:19 AM AST     0.99 feet High Tide
Tue -- 06:18 AM AST     Sunrise
Tue -- 06:47 AM AST     0.30 feet Low Tide
Tue -- 12:40 PM AST     Moonset
Tue -- 02:14 PM AST     1.65 feet High Tide
Tue -- 06:19 PM AST     Sunset
Tue -- 09:14 PM AST     0.80 feet Low Tide
Tue -- 09:58 PM AST     Last Quarter
Tue -- 11:50 PM AST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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110.90.80.60.40.30.30.40.60.81.11.41.61.61.61.51.31.110.90.80.80.9

Tide / Current Tables for Puerto Real, Puerto Rico
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Puerto Real
Click for Map
Tue -- 12:16 AM AST     0.72 feet High Tide
Tue -- 06:18 AM AST     Sunrise
Tue -- 06:42 AM AST     0.22 feet Low Tide
Tue -- 12:40 PM AST     Moonset
Tue -- 02:11 PM AST     1.20 feet High Tide
Tue -- 06:19 PM AST     Sunset
Tue -- 09:09 PM AST     0.59 feet Low Tide
Tue -- 09:58 PM AST     Last Quarter
Tue -- 11:51 PM AST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.70.70.60.50.40.30.20.20.30.40.60.811.11.21.21.110.80.70.60.60.60.6

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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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