Wednesday, March3, 2021
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Marine Weather and Tides
Emajagua, PR

Version 3.4
NOTICE
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 6:39AMSunset 6:31PM Wednesday March 3, 2021 7:55 AM AST (11:55 UTC) Moonrise 11:02PMMoonset 9:56AM Illumination 77% Phase: Waning Gibbous; Moon at 19 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- 403 Am Ast Wed Mar 3 2021
.small craft should exercise caution...
Today..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated showers.
Tonight..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers through the night.
Thursday..Southeast winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Scattered showers through the day.
Thursday night..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 8 seconds. Isolated showers.
Friday..East winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 11 seconds. Scattered showers.
Saturday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Numerous showers.
Sunday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers.
AMZ700 403 Am Ast Wed Mar 3 2021
Synopsis for puerto rico and the uS. Virgin islands waters... Surface high pressure north of the area will promote moderate to fresh east-northeast winds through this morning, turning more east to southeasterly this afternoon and through the rest of the week. Although seas and winds will gradually subside, choppy conditions will continue through tonight. By Thursday into Friday, a northerly swell will push across the local atlantic waters and passages, briefly resulting in choppy conditions once again.


7 Day Forecast for Marine Location Near Emajagua, PR
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location: 18, -65.88     debug


Area Discussion for - San Juan, PR
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FXCA62 TJSJ 030803 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 403 AM AST Wed Mar 3 2021

SYNOPSIS. A drier air mass will continue through at least Friday over the region. A few areas of low-level clouds and light showers may move at times across the islands, but overall fair weather conditions should prevail through the workweek. Moisture increases over the region in a southeasterly wind flow by late Friday into Saturday. Drier conditions are expected on Sunday and moisture gradually increases early next week. Winds are forecast to increase once again from the east to northeast during the first part of next week.

SHORT TERM. Today through Friday .

A mid to upper level ridge will continue to hold today over the local area through early Thursday. This is causing a trade wind cap around 850 mb, while the moisture content remains trapped under this layer. At the surface, a generally dry air mass is evident on satellite imagery and in the forecast soundings, with precipitable water values around 1.0 inch or less. A few trade wind showers could be advected into the eastern sections of Puerto Rico and over the U.S. Virgin Islands during this period, but no significant rainfall accumulation are expected due to the lack of mid and upper level support.

As a polar trough and a cold front exit the eastern coast of the United States later today and the surface high pressure moves toward the eastern Atlantic, the wind flow will response by shifting more from the east-southeast today, then more from the south-southeast for the end of the workweek. Additionally, the trade wind cap will gradually weaken, allowing deeper moisture to flow into the region. So far, the model guidance are showing a moisture field being pulled from the south by late Friday, increasing precipitable water values to 1.2 to 1.4 inches. As a result, shower activity is expected to increase by then over the islands. The layer of southeasterly winds is expected to extend into the mid-levels of the atmosphere, resulting in temperatures increasing as well, with highs reaching the upper 80s, especially near the coastal sections.

LONG TERM. Saturday through Wednesday .

Polar trough and frontal boundary over the western Atlantic are expected to remain just north of the region, while an induced surface trough west of the area promotes a moist southeasterly wind flow across the region on Saturday. Therefore, expect showers to move across the USVI and east/southeast sections of PR during the early morning hours, followed by periods of possible locally heavy rainfall over the interior and northwestern PR. On Sunday, trade winds are forecast to return to around 15-20 kts and limit shower development during the afternoon hours over western PR. Across the USVI, fair weather conditions should prevail and normal to above normal temperatures are expected in general across the islands.

For early next week, another induced surface trough is forecast to develop to our northwest, and increase moisture content in general across the local area on Monday. However, models suggest today that the best areas of moisture are to remain over Hispaniola, and a broad surface high pressure will move over the western Atlantic . promoting a moderate to fresh northeast wind flow across the islands through midweek. This should favor a cool advective weather pattern, with trade wind showers moving over the USVI and east/northeast sections of PR during the night/early morning hours . followed by shallow convection developing during the afternoon hours over west/southwestern PR.

AVIATION. Mainly VFR conditions expected to prevail through the forecast period. Winds will be from the east at 10 to 15 knots, shifting from the ESE around 03/15Z. VCSH are possible after 15Z for TJBQ, which could result in brief MVFR conditions due to reduced VIS and low ceilings.

MARINE. Small crafts should exercise caution due to seas up to 6 feet and east winds up to 20 knots across most of the regional waters. There is a moderate risk of rip currents for all the islands. A long period northerly swell will move briefly on Thursday and Friday. Winds will gradually turn more from the east to southeast later today and become light to moderate by the end of the week.

FIRE WEATHER. There is an elevated fire danger for the southern coastal plains of Puerto Rico today. Other areas across the interior and western PR may see relative humidities in the low 40%s, but light afternoon showers are expected to develop this afternoon across these areas.

PRELIMINARY POINT TEMPS/POPS. SJU 85 72 85 73 / 30 30 40 10 STT 83 74 84 74 / 30 20 20 30

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

SHORT TERM . ERG LONG TERM . DSR


Weather Reporting Stations
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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, PR30 mi59 minSE 410.00 miA Few Clouds73°F69°F87%1017 hPa

Link to 5 minute data for TJSJ

Wind History from JSJ (wind in knots)
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Last 24hrE9E16E14E17NE17NE13
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Tide / Current Tables for Puerto Maunabo, Puerto Rico
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Puerto Maunabo
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Wed -- 12:25 AM AST     0.51 feet High Tide
Wed -- 03:41 AM AST     0.29 feet Low Tide
Wed -- 06:40 AM AST     Sunrise
Wed -- 09:56 AM AST     Moonset
Wed -- 10:50 AM AST     0.46 feet High Tide
Wed -- 04:16 PM AST     -0.13 feet Low Tide
Wed -- 06:30 PM AST     Sunset
Wed -- 11:01 PM AST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.50.40.30.30.30.30.40.40.40.50.50.40.30.1-0.1-0.1-0.1-0.1-00.10.20.30.4

Tide / Current Tables for Vieques Passage, Puerto Rico Current
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Vieques Passage
Click for Map
Wed -- 01:57 AM AST     0.85 knots Max Flood
Wed -- 05:10 AM AST     -0.00 knots Slack
Wed -- 06:39 AM AST     Sunrise
Wed -- 08:26 AM AST     -0.86 knots Max Ebb
Wed -- 09:54 AM AST     Moonset
Wed -- 11:54 AM AST     0.00 knots Slack
Wed -- 02:35 PM AST     0.56 knots Max Flood
Wed -- 05:21 PM AST     -0.00 knots Slack
Wed -- 06:29 PM AST     Sunset
Wed -- 08:26 PM AST     -0.66 knots Max Ebb
Wed -- 11:01 PM AST     Moonrise
Wed -- 11:21 PM AST     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.80.80.70.50.1-0.3-0.7-0.8-0.8-0.6-0.300.30.50.50.40.1-0.2-0.5-0.6-0.6-0.5-0.1

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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