Tuesday, August4, 2020
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Marine Weather and Tides
Daguao, PR

Version 3.4
NOTICE
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 6:00AMSunset 6:56PM Tuesday August 4, 2020 9:47 AM AST (13:47 UTC) Moonrise 7:59PMMoonset 6:45AM Illumination 100% Phase: Full Moon; Moon at 15 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- 342 Am Ast Tue Aug 4 2020
Today..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 8 seconds. Scattered showers through the day.
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.
Wednesday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Scattered showers.
Wednesday night..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated Thunderstorms in the evening. Scattered showers through the night.
Thursday..East winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Isolated Thunderstorms. Scattered showers.
Friday..East winds 15 to 20 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Scattered showers and isolated Thunderstorms.
Saturday..East winds 15 to 20 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Scattered showers.
AMZ700 342 Am Ast Tue Aug 4 2020
Synopsis for puerto rico and the uS. Virgin islands waters... A gentle to moderate east to southeast wind flow will persist across the regional waters with a slight chop across the offshore atlantic waters today. Occasional passing showers will continue over the coastal waters this morning, with isolated Thunderstorms possible during the afternoon mainly off the north and west coastal areas of puerto rico. The next tropical wave is forecast to move into the local waters by Friday.


7 Day Forecast for Marine Location Near Daguao, PR
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location: 18.19, -65.62     debug


Area Discussion for - San Juan, PR
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FXCA62 TJSJ 040843 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 443 AM AST Tue Aug 4 2020

SYNOPSIS. An upper level low will move just to our south on Wednesday and linger over the region through Friday. A weak Saharan Air Layer(SAL) and drier air will continue to filter today and tomorrow across the region. A trough associated to the upper level low should increase afternoon convection on Thursday. A tropical wave will bring additional shower and thunderstorm activity across the islands on Friday and through Friday night. Another SAL with drier air is expected during the weekend.

SHORT TERM. Today through Thursday . A mid-level ridge will hold north of the region through Wednesday, while an upper level low approaches from the east to be positioned just south of the islands at least through Thursday. At the surface, a drier air mass has filtered in from the east. Satellite-derived precipitable water products show values dropping to near 1.5 inches today, while an even drier air mass is expected tomorrow. However, small patches of moisture will cause a few showers over eastern Puerto Rico and the U.S. Virgin Islands early in the day, followed by afternoon convection, especially over northwestern Puerto Rico. Additionally, some Saharan dust is forecast to turn skies hazy through the short-term forecast period.

In terms of temperatures, a tropical wave well to the north of the region and a surface high pressure will continue to induce southeasterly winds today. As a result, highs will soar into the low and mid-90s, but with heat indices ranging between 100 to 106 degrees in low elevations areas. By tomorrow, the wind flow will shift more from the east, easing heat indices a bit, but still approaching the 100 degree mark.

Then, on Thursday, a mid-level trough develops north of the area. Moisture is expected to increase a bit too as small patches of clouds move over the islands. This should result in an enhanced chance of shower and thunderstorm development, especially during the afternoon hours over western Puerto Rico.

LONG TERM. Friday through Tuesday . A tropical wave is expected to enter the eastern Caribbean on Friday and move across the local area between Friday afternoon into Saturday morning. This wave will increase shower and thunderstorm activity across the islands and local waters, especially across the eastern and Caribbean waters as it interacts with the mid to upper level trough to our northwest. Urban and small stream flooding is expected with the heaviest showers on Friday. As the wave exits the region on Saturday morning, showers and thunderstorms are expected to develop once again over portions of central and western PR due to lingering moisture. At the same time, a Saharan Air Layer with drier air will move over the region and promote more stable conditions through at least Tuesday. Another tropical wave is forecast to increase shower activity by late Tuesday night into Wednesday.

AVIATION. Mainly VFR conditions are anticipated through the forecast period. TSRA could result in TEMPO groups across TJBQ after 04/16Z due to reduced VIS and low ceilings. VCSH will be possible at TJSJ also. Low level winds will be out of the southeast at 10 to 15 knots.

MARINE. Seas are forecast to range between 3-5 feet in general across the regional waters through the end of the week, with seas up to 4 feet across the western waters of PR. East to southeast trades will continue between 5-15 kts for the next several days. Locally higher winds are expected across the offshore Atlantic waters today. A moderate risk of rip currents will continue mainly for the north and east facing beaches of PR and St. Croix.

PRELIMINARY POINT TEMPS/POPS. SJU 93 79 89 78 / 40 20 30 30 STT 90 80 90 79 / 30 30 40 40

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

DSR/ERG


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
41056 10 mi47 min E 12 G 14 84°F 84°F3 ft1017 hPa (+1.0)
ESPP4 - 9752695 - Esperanza, PR 10 mi47 min ESE 9.9 G 15 84°F1018.2 hPa (+1.1)
CLBP4 - 9752235 - Culebra, PR 19 mi47 min 87°F 85°F1017.9 hPa (+0.9)
41053 - San Juan, PR 32 mi107 min ESE 9.7 G 12 84°F 84°F4 ft1016.4 hPa (+0.6)
SJNP4 - 9755371 - San Juan, PR 32 mi47 min E 12 G 13 85°F 85°F1017.9 hPa (+0.7)
JOXP4 - Jobos Bay Reserve, Puerto Rico 36 mi62 min E 6 87°F 1019 hPa78°F
CHAV3 - 9751639 - Charlotte Amalie, VI 38 mi47 min 85°F 1018.3 hPa (+1.1)
LAMV3 48 mi47 min 85°F 85°F

Wind History for Esperanza, Vieques Island, PR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Juan, Luis Munoz Marin International Airport, PR26 mi51 minE 1210.00 miA Few Clouds87°F78°F75%1017.8 hPa

Link to 5 minute data for TJSJ

Wind History from JSJ (wind in knots)
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Last 24hrE5SE10SE10S11SE7S10
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E9E10E9SE5E4E4SE5SE3E3E5SE4SE3SE4E9E12
1 day agoCalmNE12NE16E14E13E16E17E13E9E9E7E6E9E6E4CalmCalmCalmCalmCalmCalmCalmSE34
2 days agoE13NE12NE17E17NE17E14E12NE18E13E9E6E5E5E5E3CalmSE3S3CalmCalmCalmCalmCalmN4

Tide / Current Tables for Roosevelt Roads, Puerto Rico
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Roosevelt Roads
Click for Map
Tue -- 04:28 AM AST     0.32 feet Low Tide
Tue -- 06:01 AM AST     Sunrise
Tue -- 06:45 AM AST     Moonset
Tue -- 09:01 AM AST     0.65 feet High Tide
Tue -- 03:29 PM AST     -0.02 feet Low Tide
Tue -- 06:54 PM AST     Sunset
Tue -- 07:58 PM AST     Moonrise
Tue -- 10:20 PM AST     1.09 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.90.70.50.40.30.30.40.50.60.70.60.50.40.20.1-0-00.10.30.60.811.11.1

Tide / Current Tables for Vieques Passage, Puerto Rico Current (2)
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Vieques Passage
Click for Map
Tue -- 02:05 AM AST     -0.00 knots Slack
Tue -- 05:38 AM AST     -0.90 knots Max Ebb
Tue -- 06:01 AM AST     Sunrise
Tue -- 06:45 AM AST     Moonset
Tue -- 09:21 AM AST     0.00 knots Slack
Tue -- 12:02 PM AST     0.51 knots Max Flood
Tue -- 02:59 PM AST     -0.00 knots Slack
Tue -- 05:42 PM AST     -0.45 knots Max Ebb
Tue -- 06:54 PM AST     Sunset
Tue -- 07:58 PM AST     Moonrise
Tue -- 08:20 PM AST     0.00 knots Slack
Tue -- 11:43 PM AST     0.69 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.40-0.3-0.7-0.9-0.9-0.7-0.5-0.10.20.40.50.40.3-0-0.3-0.4-0.4-0.3-0.10.20.50.6

Weather Map
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wmap_A
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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (9,2,3,4)
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Ground Weather Radar Station Puerto Rico,Virgin Islands
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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.