Sunday, September27, 2020
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Marine Weather and Tides
Luis M. Cintrón, PR

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:11AMSunset 6:15PM Sunday September 27, 2020 1:01 PM AST (17:01 UTC) Moonrise 3:55PMMoonset 2:33AM Illumination 79% Phase: Waxing Gibbous; Moon at 10 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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AMZ725 Coastal Waters Of Southern Usvi Vieques And Eastern Puerto Rico Out 10 Nm- 1036 Am Ast Sun Sep 27 2020
Rest of today..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Scattered showers.
Tonight..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 8 seconds. Scattered showers through the night. Isolated Thunderstorms after midnight.
Monday..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Scattered showers.
Monday night..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Scattered showers.
Tuesday..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Scattered showers.
Wednesday..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Scattered showers and isolated Thunderstorms.
Thursday..East winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 7 seconds. Isolated Thunderstorms. Scattered showers.
AMZ700 1036 Am Ast Sun Sep 27 2020
Synopsis for puerto rico and the uS. Virgin islands waters... As a high pressure moves into the north-central atlantic early in the week, moderate to locally fresh east-southeast trades will prevail through much of the workweek. A tropical wave forecast to cross the eastern caribbean later today through Monday will increase the chance for shower and isolated Thunderstorm development across the regional waters.


7 Day Forecast for Marine Location Near Luis M. Cintr�n, PR
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location: 18.32, -65.64     debug


Area Discussion for - San Juan, PR
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FXCA62 TJSJ 271604 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 1204 PM AST Sun Sep 27 2020

UPDATE. A light east to northeast wind flow will continue across the region today with weak surface high pressure ridge north of the area and a tropical wave crossing the Lesser Antilles. Mid-upper level trough (TUTT) extends from just northeast of the northern Leeward islands southwestwards into the eastern Caribbean. Occasional bands of passing clouds and showers continued to cross the regional waters in the northeast wind flow, while reaching portions of the U.S. Virgin Islands and eastern Puerto Rico from time to time. Recent TJSJ upper air sounding still fairly moist with precipitable water at 1.88 inches and a light east northeast wind flow below 500 millibars. Afternoon showers and thunderstorms still forecast to develop across the region today. Increasing potential for additional convection over portions of the islands and local waters overnight through Monday with the approach of the tropical wave and the proximity of the TUTT, which is to shift westwards and closer to the islands. Only minor changes made to the inherited short term package forecast and in agreement with the previous discussion at this time.

AVIATION update. Prevailing VFR by SCT-BKN lyrs nr FL025 . FL050 with SHRA/Isold TSRA en route btw Ern PR and the northern Leeward Islands. VCSH at all terminals today with VCTS mainly at TNCM/TKPK/TJSJ/TJMZ/TJPS til 27/23Z. Sfc wnd mainly fm NE with sea breeze variations bcmg light and variable aft 27/23Z.

MARINE UPDATE. No change to previous marine discussion. Sea are still expected remain below SCA advisory criteria and range between 2-5 feet and light to moderate prevailing easterlies. Tropical wave will cross the eastern Caribbean today through Monday to increase the chance for showers and thunderstorm development over the regional waters.

PREV DISCUSSION. /issued 435 AM AST Sun Sep 27 2020/

SYNOPSIS . Above normal moisture is expected to continue over the area, promoting the formation of showers and thunderstorms every afternoon for the next several days. Urban and small stream flooding will be possible. Another tropical wave is expected on Wednesday with some Saharan dust expected for the end of the week.

SHORT TERM . Today through Tuesday . For the next few days, a surface high pressure across the central Atlantic will bring easterly trade winds to the local islands. Above normal available moisture will persist over the local area today, combined with a tropical wave that is expected to move through the local area this afternoon, will cause the development of showers and thunderstorms across the local area. For Puerto Rico, the areas with the highest chance of thunderstorms are across the western to eastern interior as well as portions of southern Puerto Rico. These areas could observe urban and small stream flooding. That said, scattered showers are expected elsewhere in Puerto Rico and around the U.S. Virgin Islands, and ponding of water on roadways and poor drainage areas can occur. For Monday, the higher than normal moisture will linger across the local area, which will cause scattered showers across the area during the morning and overnight hours. However, Monday afternoon, with the diurnal heating and local effects, we can once again expect the development of showers and thunderstorms across Puerto Rico. This time the convection is expected across central to northwestern Puerto Rico, as the wind flow will be mainly from the east to east southeast. Tuesday looks like it will have slightly less shower activity since drier air will finally move in. That said, there will still be enough moisture for good shower and thunderstorm activity, but it will be limited compared to today and Monday. The wind flow is expected to be more southeasterly on Tuesday afternoon, so northwestern Puerto Rico has the best chance of thunderstorms, with isolated to scattered showers elsewhere.

LONG TERM . Wednesday through Monday . A tropical wave is expected to move over the islands on Wednesday, increasing moisture content once again with precipitable water values around 1.9 to 2.2 inches. Additionally, a mid-level trough in the area will cause instability to increase, with cold temperatures and divergence aloft. As a result, showers and thunderstorms are expected over the islands. Urban and small stream flooding will be possible. For the rest of the workweek, some Saharan dust will filter from the east, resulting in hazy skies. However, fragmented groups of clouds embedded in the trade winds will also move over the area. Therefore, the available moisture in combination with local effects will result in afternoon activity, especially over the interior and western Puerto Rico. For the weekend, a mid to upper level high pressure will begin to build north of the western Atlantic, decreasing instability levels aloft. At the lower levels,a drier air mass is expected to move in, with some Saharan dust lingering and precipitable water values falling to near 1.6 inches. Hence, a decrease in rainfall activity can be expected through Monday.

AVIATION . VFR conds at terminals through 27/16Z. VCSH expected at the TJSJ, TIST, and TISX terminals today. VCTS psbl at TJPS after 27/16Z. Sfc winds at around 10 kts from the east to northeast with sea breeze variations expected after 27/13Z. BKN SKY possible at around FL050 . FL070, especially after 27/16Z.

MARINE . Seas are expected to remain at 3 to 5 feet with winds out of the east northeast at 10 to 15 knots. This conditions should continue for the early part of the workweek. There is a moderate rip current risk for the north facing beaches of Puerto Rico, Vieques, Culebra and St. Thomas.

PRELIMINARY POINT TEMPS/POPS. SJU 89 80 90 79 / 40 50 50 30 STT 90 80 90 80 / 50 40 40 30

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

SHORT TERM . RAM LONG TERM . TW PUBLIC DESK . RVT


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
41056 10 mi61 min NE 12 G 14 85°F 86°F3 ft1012 hPa (-0.3)
CLBP4 - 9752235 - Culebra, PR 18 mi43 min 89°F 87°F1012.3 hPa
ESPP4 - 9752695 - Esperanza, PR 18 mi43 min ENE 7 G 12 85°F1012.7 hPa
41053 - San Juan, PR 27 mi61 min ENE 9.7 G 12 85°F 86°F3 ft1012.2 hPa (-0.3)
SJNP4 - 9755371 - San Juan, PR 27 mi43 min ENE 8 G 11 88°F 87°F1013.1 hPa
CHAV3 - 9751639 - Charlotte Amalie, VI 38 mi43 min 85°F 1012.5 hPa
JOXP4 - Jobos Bay Reserve, Puerto Rico 40 mi76 min ESE 7 92°F 1014 hPa76°F
41052 - South of St. John, Virgin Islands 47 mi61 min NE 9.7 G 12 82°F 86°F2 ft1011.9 hPa (+0.0)
LAMV3 49 mi43 min 83°F 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, PR21 mi65 minENE 1110.00 miPartly Cloudy89°F77°F68%1013.1 hPa

Link to 5 minute data for TJSJ

Wind History from JSJ (wind in knots)
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Last 24hrE11NE12E11E11E11E10NE9NE7NE8NE6E7NE8E4CalmCalmS3CalmCalmSW3W3NE6NE7NE12NE11
1 day agoNE11NE12NE9E10NE10E8E6E5E4CalmCalm3CalmSW4CalmCalmW4SW3CalmSW3NE4NE6E10
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2 days agoNE10E7NE9NE9E6E6E6E4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmE54NE8NE10

Tide / Current Tables for Playa de Fajardo, Puerto Rico
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Playa de Fajardo
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Sun -- 12:00 AM AST     0.68 feet Low Tide
Sun -- 02:33 AM AST     Moonset
Sun -- 05:01 AM AST     1.16 feet High Tide
Sun -- 06:12 AM AST     Sunrise
Sun -- 11:08 AM AST     0.26 feet Low Tide
Sun -- 03:55 PM AST     Moonrise
Sun -- 06:13 PM AST     Sunset
Sun -- 06:18 PM AST     1.75 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.70.70.911.11.21.110.80.50.30.30.30.50.81.11.41.61.71.71.61.31.10.8

Tide / Current Tables for Vieques Passage, Puerto Rico Current
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Vieques Passage
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Sun -- 01:29 AM AST     -0.75 knots Max Ebb
Sun -- 02:33 AM AST     Moonset
Sun -- 05:08 AM AST     0.00 knots Slack
Sun -- 06:12 AM AST     Sunrise
Sun -- 07:54 AM AST     0.46 knots Max Flood
Sun -- 10:50 AM AST     -0.00 knots Slack
Sun -- 01:44 PM AST     -0.44 knots Max Ebb
Sun -- 03:54 PM AST     Moonrise
Sun -- 04:32 PM AST     0.00 knots Slack
Sun -- 06:13 PM AST     Sunset
Sun -- 07:49 PM AST     0.58 knots Max Flood
Sun -- 10:54 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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-0.6-0.7-0.7-0.6-0.3-00.20.40.50.40.2-0-0.3-0.4-0.4-0.3-0.10.10.40.50.60.50.3-0

Weather Map
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GEOS Local Image of    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Other links: Northern Pacific     Contential US     Full GOES-East
Ground Weather Radar Station Puerto Rico,Virgin Islands
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