Friday, April16, 2021
Privacy Policy
L-36.com

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 6:04AMSunset 6:41PM Friday April 16, 2021 6:33 AM AST (10:33 UTC) Moonrise 9:08AMMoonset 10:38PM Illumination 20% Phase: Waxing Crescent; Moon at 4 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
    EDIT      (on/off)   Help
AMZ735 Coastal Waters Of Southern Puerto Rico Out 10 Nm- 357 Am Ast Fri Apr 16 2021
Today..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 8 seconds. Isolated showers through the day.
Tonight..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 8 seconds. Isolated showers.
Saturday..Southeast winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds.
Saturday night..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Isolated showers.
Sunday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Isolated showers.
Monday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Isolated showers.
Tuesday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 8 seconds. Isolated showers.
AMZ700 357 Am Ast Fri Apr 16 2021
Synopsis for puerto rico and the uS. Virgin islands waters... Seas of 5 feet or less will prevail across the local waters through the upcoming weekend, despite a weak northerly swell that will continue to affect the waters today. Another weak northerly swell will follow over the weekend. Gentle to moderate winds will continue for the next several days.


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


Area Discussion for - San Juan, PR
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
FXCA62 TJSJ 160830 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 430 AM AST Fri Apr 16 2021

SYNOPSIS. Moisture will increase today due to the passage of an old frontal boundary. As a result, showers and thunderstorms are expected to develop, with the potential for heavy rain. Drier air, along with Saharan dust is expected for the weekend and the first part of the next workweek.

SHORT TERM. Today through Sunday .

The remnants of an old frontal boundary, are moving across the Caribbean waters into the Anegada Passage and across portions of the islands. This will cause a surge in moisture and increase shower activity in general through the evening hours. An upper level jet will move across the Atlantic waters later today, enhancing the potential for isolated thunderstorm development and for afternoon heavy showers. Urban and small stream flooding is expected with the heaviest showers. As steering winds are from the southeast today, shower development along the Cordillera Central is expected to drift northwards this afternoon. The remnants of the frontal boundary are expected to slowly move into the Atlantic waters by tonight, and moist southerly winds should continue to carry showers across the southern and eastern sections of PR. Across the USVI, cloudy skies and scattered shower activity are expected through much of the day.

For Saturday, the remnants of the frontal boundary are expected to move over the offshore Atlantic waters and away of the region, while a building ridge east of the Leeward Islands will promote drier air intrusion and the arrival of a Saharan Air Layer (SAL) should cause hazy skies and limit shower activity to diurnal activity over northwestern PR. Even drier conditions are expected on Sunday, and no significant rainfall accumulations are anticipated at this moment across the islands. Overall, the weekend should be hazy due to the SAL and maximum temperatures should range from the high 80s to low 90s across coastal areas.

LONG TERM. Monday through Friday . As the workweek begins, the mid level ridge will continue to hold over the eastern Caribbean. At the surface, high pressure extends from the central toward the western Atlantic Ocean, generating a southeasterly wind flow over the local islands. The latest guidance still shows dry air at the low and mid levels. This air mass contains Saharan dust, hence hazy skies will prevail through at least Tuesday. By mid-week, the high pressure at the surface will tighten the gradient along the area, resulting in an enhanced wind flow, but so far, the models are only showing moderate winds over the regional waters. The mid-level ridge will begin to move into the central Atlantic by Wednesday into the latter part of the week, while an upper level trough develops to the northeast of the Lesser Antilles. Although the trough should continue to deepen, the islands will remain on its subsidence side. As the ridge begins to lose its influence, fragmented groups of clouds embedded in the trade winds will increase in frequency. These moisture fields will be a little deeper, reaching up to 700 mb. As a result, the atmosphere will become more favorable for shower development, with passing showers affecting eastern Puerto Rico and the U.S. Virgin Islands, and convective activity developing in the afternoon mainly over the interior and western sections of Puerto Rico. There is still some uncertainty in the timing of arrival of these groups of clouds, but so far, both the GFS and ECMWF are suggesting this increase in moisture by sometime on Thursday and Friday.

AVIATION. The remnants of an old front will move across PR and the USVI through the day. This will cause tempo MVFR cigs across all the local terminals, as well as intermittent periods of -SHRA. In addition, +SHRA/TSRA is expected to develop this afternoon over central PR, drifting to the north and impacting the northern terminals through at least sunset with possible MVFR to brief IFR conditions. Winds are expected from the SE at 10-15 kt, with higher gusts at times in SHRA/TSRA.

MARINE. Recent observations are showing a dominant period of 10-11 seconds over the northern areas of Puerto Rico, with seas 3 to 5 feet. The outer buoy, 41043, also shows 10 seconds at 6 feet. This weak northerly swell is expected to continue today, while another one is expected to arrive during the weekend.

For the beaches, there is a moderate rip current risk for the northwest, northern, and northeast coast of Puerto Rico, all of Culebra, eastern Vieques, most of St. Thomas, northwest St. John, and the eastern tip of St. Croix.

PRELIMINARY POINT TEMPS/POPS. SJU 87 76 89 76 / 40 40 20 20 STT 86 77 84 76 / 50 50 20 20

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

SHORT TERM . DS LONG TERM . ERG


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
JOXP4 - Jobos Bay Reserve, Puerto Rico 18 mi49 min NW 1 73°F 1015 hPa65°F
ESPP4 - 9752695 - Esperanza, PR 23 mi46 min NNE 2.9 G 4.1 79°F1014.5 hPa
41056 28 mi34 min ENE 7.8 G 9.7 78°F 80°F4 ft
SJNP4 - 9755371 - San Juan, PR 34 mi46 min S 1.9 G 2.9 75°F 81°F1014.7 hPa
41053 - San Juan, PR 35 mi34 min S 1.9 G 3.9 75°F 80°F5 ft1013.6 hPa (+0.7)
42085 - Southeast of Ponce, PR 36 mi94 min NNE 7.8 G 9.7 77°F 81°F2 ft1012.8 hPa (+0.0)
CLBP4 - 9752235 - Culebra, PR 37 mi46 min 76°F 81°F1014.3 hPa

Wind History for Yabucoa Harbor, PR
(wind in knots)    EDIT      (on/off)   Help
Last
24hr
1 day
ago
2 days
ago

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Juan, Luis Munoz Marin International Airport, PR30 mi38 minN 010.00 miA Few Clouds74°F67°F79%1014.5 hPa

Link to 5 minute data for TJSJ

Wind History from JSJ (wind in knots)
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
Last 24hrCalmN6NE4N8E8N7NE9
G15
NE9
G16
E10E11NE13E13E10E8E7E63CalmS3CalmCalmCalmCalmCalm
1 day agoSW34W6NW9NW9
G16
NW11N11N9
G17
N11N11N9NW8N7NW8NW7N7N6N6N5N7N4N5NE5N3
2 days agoCalmCalm34N9
G19
N11N8N76NE6NE5N5N5CalmN3CalmNW5W3W3W4W4SW3CalmSW3

Tide / Current Tables for Puerto Maunabo, Puerto Rico
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Puerto Maunabo
Click for Map
Fri -- 01:11 AM AST     0.72 feet High Tide
Fri -- 03:51 AM AST     0.66 feet Low Tide
Fri -- 06:06 AM AST     Sunrise
Fri -- 06:27 AM AST     0.66 feet High Tide
Fri -- 09:07 AM AST     Moonrise
Fri -- 03:17 PM AST     0.06 feet Low Tide
Fri -- 06:40 PM AST     Sunset
Fri -- 10:38 PM AST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
0.70.70.70.70.70.70.70.70.60.60.60.50.40.20.10.10.10.10.20.20.30.40.50.6

Tide / Current Tables for Vieques Passage, Puerto Rico Current
   EDIT      (on/off)   Help   One Week of Data
Vieques Passage
Click for Map
Fri -- 01:28 AM AST     0.67 knots Max Flood
Fri -- 04:40 AM AST     -0.00 knots Slack
Fri -- 06:04 AM AST     Sunrise
Fri -- 08:14 AM AST     -0.80 knots Max Ebb
Fri -- 09:05 AM AST     Moonrise
Fri -- 12:06 PM AST     0.00 knots Slack
Fri -- 02:37 PM AST     0.38 knots Max Flood
Fri -- 05:24 PM AST     -0.00 knots Slack
Fri -- 06:39 PM AST     Sunset
Fri -- 08:02 PM AST     -0.34 knots Max Ebb
Fri -- 10:30 PM AST     0.00 knots Slack
Fri -- 10:37 PM AST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
0.50.70.70.50.2-0.1-0.4-0.7-0.8-0.8-0.6-0.3-00.20.40.40.30.1-0.1-0.3-0.3-0.3-0.10.1

Weather Map
       (on/off)   Help Weather Map
wmap_A
GEOS Local Image of    EDIT
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.
Link to Loop

Other links: GEOS-West     Contential US     Full GOES-East
Ground Weather Radar Station




Please read website Cookie, Privacy, and Disclamers by clicking HERE.