Monday, October18, 2021
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Marine Weather and Tides
Lomas, 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 6:00PM Monday October 18, 2021 4:28 PM AST (20:28 UTC) Moonrise 5:04PMMoonset 4:33AM Illumination 95% Phase: Waxing Gibbous; Moon at 13 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- 350 Pm Ast Mon Oct 18 2021
Tonight..East winds 5 to 10 knots. Seas 2 feet or less. Dominant period 10 seconds. Isolated Thunderstorms in the evening. Scattered showers through the night.
Tuesday..East winds 5 to 10 knots. Seas 2 feet or less. Dominant period 11 seconds. Isolated showers.
Tuesday night..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 11 seconds. Isolated Thunderstorms in the evening. Scattered showers through the night.
Wednesday..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 10 seconds. Scattered showers through the day. Isolated Thunderstorms in the afternoon.
Wednesday night..East winds around 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Scattered showers and isolated Thunderstorms.
Thursday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. Scattered showers. Isolated Thunderstorms.
Friday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 13 seconds. Northeast swell around 4 feet. Isolated showers.
Saturday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 15 seconds. Northeast swell around 4 feet. Isolated Thunderstorms, then isolated showers.
AMZ700 350 Pm Ast Mon Oct 18 2021
Synopsis for puerto rico and the uS. Virgin islands waters... Light to gentle easterly winds will prevail across the regional waters tonight, slightly increasing by Tuesday and through the end of the week. Showers and a few Thunderstorms will remain possible across the local waters for the next few days.


7 Day Forecast for Marine Location Near Lomas, PR
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location: 18.28, -65.93     debug


Area Discussion for - San Juan, PR
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FXCA62 TJSJ 181445 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 1045 AM AST Mon Oct 18 2021

UPDATE.

Once again, today's TJSJ sounding reported abundant moisture with a Total Precipitable Water of 1.92 inches. Now, the steering winds were blowing between 2-3 knots with a north to northeast component. Organized convection due to the intense heating, sea breeze variations and local effects will develop across the mountains, and southern slopes and southern plains of Puerto Rico. Due to the lack of winds, this activity will slowly drift after developing, increasing the threat of flooding and mudslides across already saturated soils and swollen rivers.

AVIATION.

Today convection will drift slowly southward and may impact JPS. However, mainly VFR conditions will prevail through the forecast period. JPS can expect some SHRA/TSRA between 18/17-22z. At this time, we think convection, although will produce frequent lightning, should remain at a safe distance from JSJ/JBQ but creating mountain obsc along the Cordillera Central. The USVI will possibly observe VCSH. Winds will remain light and VRB but with sea breeze variations, and gusty in/near TSRA.

MARINE.

Local and regional buoys continue indicating seas below 3 feet and winds below 10 knots. However, thunderstorms will develop across portions of the local waters this afternoon into the evening; therefore, mariners should exercise caution around these storms.

PREV DISCUSSION. /issued 524 AM AST Mon Oct 18 2021/

SYNOPSIS . Light steering winds will promote slow moving storms this afternoon, enhancing the risk for flooding. Winds are expected to turn more from the east to northeast through midweek, and moisture content is forecast to remain at normal to above normal levels through at least Thursday. A building mid-level ridge during the end of the week should promote a drying trend, but diurnally induced afternoon showers are expected each day.

SHORT TERM . Today through Wednesday .

Good moisture persists across the region. Based on Total Precipitable Water imagery from GOES-16, moisture levels remain on the high end of normal or above normal across and in the vicinity of the CWA; PWATs are around 1.8 to 2.3 inches. Meanwhile, the steering flow remains light. That said, it will increasingly become more east-northeasterly today into tomorrow. Local effects and daytime heating will continue to dominate the weather pattern. Afternoon convection is likely to begin over the interior of Puerto Rico, extending into southern portions of the island. Tomorrow, the peak of activity will likely be over interior and southwestern Puerto Rico.

Conditions aloft are not very favorable for convection, with mid- to upper-level ridging. That being said, the moisture will combine with available instability/daytime heating to cause widespread shower activity with isolated thunderstorms. Showers will be slow-moving, leading to locally high rainfall accumulations. Erosion of the ridge is expected for tomorrow into Wednesday, providing an increase in instability over the region. As moisture is expected to persist, active weather is anticipated, remaining the theme through the short term period. Additional moisture makes its way into the region late on Wednesday, as a tropical wave approaches from the east. Also on Wednesday, winds finally pick up. The frontal boundary, and its trough, will pull away to the northeast, allowing the pressure gradient to tighten somewhat, as a ridge builds into the western central Atlantic. Streamers become more likely in the east with this increase in wind speeds, and showers will not have the same tendency to linger over an area for an extended period of time. That said, an increase in activity means that the potential for high rainfall totals in some areas continues.

There remains an enhanced risk for flooding for portions of the region through the short term period, as rain falls on already saturated soils.

LONG TERM . Thursday through Tuesday .

A tropical wave is expected to cross the region on Thursday, with good moisture content through 700 mb. At upper levels, a short wave trough is expected to move over the area, and the 500 mb temperature is forecast to remain between -6.5 to -7.0 degrees Celsius. The wave should move across the USVI through the morning hours, and across PR during the afternoon hours. This will enhance morning convection across the USVI and later across mainland PR. Trailing moisture during the evening hours will promote scattered shower with posible thunderstorm activity across portions of the regional waters and between the USVI/eastern sections of PR as well. Therefore, the threat for flooding rains will remain high.

A mid-level ridge is then expected to build over the area from the north and hold through the rest of the long term period. This will promote drier air intrusion and warmer 500 mb temperatures. At least on Fri-Sat, seasonable weather conditions are expected with sunny to partly cloudy skies during the morning hours with an occasional trade wind shower moving over portions of the USVI and eastern PR, followed by diurnally induced afternoon showers with isolated thunderstorms over the western interior of PR. On Sunday, a tropical wave is forecast to move across the Caribbean waters, increasing slightly moisture content and the chances of early morning/afternoon convection in diurnal pattern across the islands. Further warming of the 500 mb temps are expected early next week, and precipitable water content is expected to decrease between 1.50-1.75 inches. This should favor fair weather conditions with shallow convection developing during the afternoon over western PR.

AVIATION . Generally VFR conds expected next 24 hours across all terminals. Local effects and daytime heating dominate activity - peak SHRA/TSRA activity this afternoon expected to be interior into southern PR, causing VCTS for TJSJ/TJPS. VCSH for most other terminals. Relatively light winds are likely to be dominated by sea breeze, with speeds to near 10 knots after sunrise.

MARINE . Relative tranquil seas will continue for the next several days. Winds are expected to remain light today, slightly increasing each day and turning more from the east. Choppy wind driven seas up to 6 feet are forecast to return late in the workweek. There is a low risk of rip currents across all the islands today.

PRELIMINARY POINT TEMPS/POPS. SJU 89 78 88 78 / 40 40 30 40 STT 88 78 89 79 / 60 50 50 50

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

SHORT TERM . CAM LONG TERM . OM PUBLIC DESK . CVB


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SJNP4 - 9755371 - San Juan, PR 16 mi58 min ENE 7G8.9 86°F 87°F1011.9 hPa
41053 - San Juan, PR 16 mi88 min NNE 7.8G9.7 85°F 87°F2 ft1011.2 hPa (-1.9)
41056 25 mi88 min NNE 1.9G3.9 86°F 89°F1 ft1009 hPa (-2.2)
JOXP4 - Jobos Bay Reserve, Puerto Rico 27 mi103 min E 2.9 85°F 1013 hPa78°F
ESPP4 - 9752695 - Esperanza, PR 28 mi58 min E 2.9G5.1 85°F 86°F1011.4 hPa
CLBP4 - 9752235 - Culebra, PR 33 mi58 min 86°F 87°F1011.8 hPa
41121 43 mi32 min 87°F2 ft
42085 - Southeast of Ponce, PR 43 mi88 min ESE 3.9G5.8 84°F 2 ft1011.6 hPa (-2.2)
AROP4 - 9757809 - Arecibo, PR 43 mi58 min NE 5.1G7 87°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, PR11 mi32 minENE 810.00 miPartly Cloudy87°F75°F67%1011.5 hPa

Link to 5 minute data for TJSJ

Wind History from JSJ (wind in knots)
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Last 24hr3S3S30000S30000SE3SE3SE300N5N7N8N8N7NE7NE8
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2 days ago000000000000000003N6N7N8S10
G16
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Tide / Current Tables for Boca De Cangrejos, Isla Verde, San Juan, Puerto Rico
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Boca De Cangrejos
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Mon -- 01:38 AM AST     0.22 feet Low Tide
Mon -- 04:33 AM AST     Moonset
Mon -- 06:18 AM AST     Sunrise
Mon -- 07:49 AM AST     1.21 feet High Tide
Mon -- 02:06 PM AST     0.17 feet Low Tide
Mon -- 05:04 PM AST     Moonrise
Mon -- 05:59 PM AST     Sunset
Mon -- 08:08 PM AST     1.11 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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Tide / Current Tables for Vieques Passage, Puerto Rico Current
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Vieques Passage
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Mon -- 03:07 AM AST     -0.62 knots Max Ebb
Mon -- 04:32 AM AST     Moonset
Mon -- 06:14 AM AST     0.00 knots Slack
Mon -- 06:17 AM AST     Sunrise
Mon -- 09:25 AM AST     0.65 knots Max Flood
Mon -- 12:34 PM AST     -0.00 knots Slack
Mon -- 03:48 PM AST     -0.67 knots Max Ebb
Mon -- 05:02 PM AST     Moonrise
Mon -- 05:57 PM AST     Sunset
Mon -- 07:10 PM AST     0.00 knots Slack
Mon -- 09:56 PM AST     0.49 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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