Friday, January24, 2020
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Marine Weather and Tides
Emajagua, 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 6:56AMSunset 6:14PM Friday January 24, 2020 10:23 PM AST (02:23 UTC) Moonrise 6:46AMMoonset 6:09PM Illumination 0% Phase: New Moon; Moon at 29 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- 916 Pm Ast Fri Jan 24 2020
Rest of tonight..Northeast winds 5 to 10 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 11 seconds. Southeast swell around 4 feet. Scattered showers.
Saturday..Northeast winds 5 to 10 knots veering southeast in the afternoon. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 11 seconds. Isolated showers.
Saturday night..Northeast winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Scattered showers.
Sunday..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 10 seconds. Scattered showers.
Sunday night..Northeast winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 10 seconds. Isolated showers.
Monday..Northeast winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 10 seconds. Scattered showers.
Tuesday..East winds 5 to 10 knots. Seas 2 feet or less. Dominant period 8 seconds. Scattered showers.
Wednesday..Northeast winds 5 to 10 knots. Seas 2 feet or less. Dominant period 10 seconds. Scattered showers.
AMZ700 916 Pm Ast Fri Jan 24 2020
Synopsis for puerto rico and the uS. Virgin islands waters... A northerly swell generated by a surface low north of the region is causing hazardous seas through the weekend across the atlantic waters and local passages. Light winds with a northerly component will prevail through Sunday, becoming more easterly and southerly early next week. The remnants of the front will continue to cause cloudiness and showers over the waters during the weekend as well, especially over the eastern and southern waters.


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 250150 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 950 PM AST Fri Jan 24 2020

UPDATE. The heavy showers that were observed today mostly occurred across the southern portions of Puerto Rico, while the rest of the island and the USVI observed light rain. A small portions of north central PR observed moderate rain, but the rainfall totals were up to around an into to 1.5 inches, compared to over 3 inches across isolated areas in south central PR. Flooding occured in Ponce municipality, which caused some roads to be impassable. The rainfall activity is gradually diminishing, but light to moderate rain is expected to continue late into the night across portions of eastern PR and S-SW PR. The USVI may receive some rain later in the night but it should be light. The cloudiness will continue over the local area through the night. The latest guidance still insists in improving weather conditions on Saturday morning, but shower activity is expected to develop once again over PR and possible the USVI on Saturday afternoon. WRF and NAM models indicate most of the rain would be across the interior and eastern sections of PR and across the USVI. However, the winds will be really light, similar to today, and the WRF and NAM models seemed to miss the mark on the areas with most rain today, so tomorrow's forecast might have some uncertainty given that it is very difficult to exactly pinpoint where the rain will develop with such light winds in the area.

AVIATION. SHRA across TJSJ and TJPS will continue causing MVFR conds for the next few hours. Wx conditions should improve after 25/03Z for TJPS and after around 25/07Z for TJSJ. Thereafter, VFR conds are expected across the local terminals, but CIGS at around FL040-050 are expected. Winds will be light and variable overnight, increasing slightly after 25/13Z.

MARINE. No changes in the small craft advisory as the marine forecast continues to be consistent with the previous forecasts. There is a change in the high risk of rip currents, the island of Vieques and some beaches of SW PR are expected to have a high risk of rip currents through Saturday.

PREV DISCUSSION. /issued 204 PM AST Fri Jan 24 2020/

SYNOPSIS . Low level moisture associated to the cold front will continue to aid in the development of showers through the weekend. A long period swell will continue to cause hazardous seas for through Sunday as well create life threatening rip currents along the Atlantic beaches of PR, Culebra and St. Thomas.

SHORT TERM . Today through Sunday . Cold front will remain mainly east and south of the forecast area, however, lingering low-level moisture associated to the front will continue over the region through the short term period. For the rest of today, diurnally induced showers are currently developing along the Cordillera Central, with moderate to locally heavy rainfall observed over the municipalities of Yauco and San German. The 12z SJU sounding indicated a weak westerly steering wind flow and this should keep showers over the interior sections of PR and later this afternoon over the eastern sections, including the San Juan metro area. As the front moves further away from the region a col develops over the region and this will keep a very light and variable wind flow through Sunday. At mid-levels, two short wave troughs are forecast to move from the west, the first one on Saturday morning and the second one on Sunday afternoon. This will continue to provide some instability for showers to develop each afternoon, mainly over the interior of PR. Showers will continue on and off over the USVI through the short term period.

LONG TERM . Monday through Saturday . From Prev Discussion .

Our pesky front will continue to impact us as we begin the workweek. Though the main low pressure system associated with the front will be well off to the east, leftover moisture along with additional moisture being drawn up from the south will keep us wet. Upper level atmospheric conditions still look uninspiring in forecast models, so only a minimal thunderstorm threat is expected. However, given the moist conditions expected over the weekend and associated saturated soils, additional rainfall on Monday could lead to urban and small stream flooding. Less of a flooding threat is expected for Tuesday, though there will still be some lingering moisture to produce scattered showers. During this period of the first part of the week, it should be mentioned that the southern coast where the earthquakes have occurred will be particularly susceptible to rainfall under these conditions.

For the rest of the week, another cold front moving in from the west will bring more rainfall across the region. At this point, Wednesday and Thursday will only see scattered showers. However, as the front nears on Friday and Saturday, shower activity could become more numerous according to long range models. Again, upper level conditions still do not look favorable for thunderstorms, though an isolated thunderstorm cannot be ruled out.

AVIATION . Mainly VFR conditions will prevail at TAF sites thru 25/10Z except for brief MVFR CIGs at TIST/TISX due SHRA associated with cold front in the vcnty. VRB sfc winds and SHRA expected for the USVI/Leeward Islands thru 25/06z. For the rest of the terminals, sfc winds will continue vrb and shifting more to the north by 25/14z.

MARINE . Small craft advisories are in effect through the weekend due to long period northerly swell, with seas building between 6-10 feet tonight across the Atlantic waters and passages. The highest seas are forecast across the offshore Atlantic waters. A high risk of rip currents will continue for the northwest to northeast beaches of PR as well across the northern beaches of Culebra and St. Thomas through at least Sunday. Seas improve early in the workweek.

PRELIMINARY POINT TEMPS/POPS. SJU 74 83 74 82 / 70 60 60 60 STT 73 83 72 83 / 50 70 70 30

SJU WATCHES/WARNINGS/ADVISORIES. PR . High Rip Current Risk through Sunday afternoon for Culebra- Mayaguez and Vicinity-North Central-Northeast-Northwest-San Juan and Vicinity-Southeast.

High Rip Current Risk through Saturday afternoon for Southwest- Vieques.

VI . High Rip Current Risk through Sunday afternoon for St Thomas. St John. and Adjacent Islands.

AM . Small Craft Advisory until 2 PM AST Sunday for Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N-Coastal Waters OF Northwestern Puerto Rico out 10 NM-Coastal Waters of Northern Puerto Rico out 10 NM-Mona Passage Southward to 17N.

Small Craft Advisory until 2 AM AST Sunday for Anegada Passage Southward to 17N-Coastal Waters OF Southwestern Puerto Rico out 10 NM-Coastal Waters of Northern USVI and Culebra out 10 NM-Coastal Waters of Southern USVI Vieques and Eastern Puerto Rico out 10 NM.



SHORT TERM . JA LONG TERM . CS PUBLIC DESK . ERG


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
YABP4 - 9754228 - Yabucoa Harbor, PR 5 mi54 min 75°F 71°F
JOXP4 - Jobos Bay Reserve, Puerto Rico 18 mi99 min E 1 77°F 1016 hPa72°F
ESPP4 - 9752695 - Esperanza, PR 23 mi54 min 77°F 81°F1016.1 hPa
41056 28 mi84 min ENE 5.8 G 7.8 77°F 81°F5 ft1014.5 hPa (+2.0)
SJNP4 - 9755371 - San Juan, PR 34 mi54 min 73°F 81°F1016.2 hPa
41053 - San Juan, PR 35 mi84 min E 1.9 G 3.9 75°F 81°F6 ft1014.7 hPa (+2.3)
42085 - Southeast of Ponce, PR 36 mi84 min E 14 G 16 79°F 81°F2 ft1014.2 hPa (+1.9)
CLBP4 - 9752235 - Culebra, PR 37 mi54 min 1015.7 hPa

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 mi88 minN 010.00 miLight Rain78°F73°F85%1015.5 hPa

Link to 5 minute data for TJSJ

Wind History from JSJ (wind in knots)
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Last 24hrCalmCalmCalmE3SE3CalmCalmCalmCalmNW63N6453N6NE7E9NE7E7E8E6CalmNW9
1 day agoCalmS33CalmCalmSW4S3S4Calm3CalmSE7SE5CalmNW12NW17
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NW10SW6CalmW7CalmW3
2 days agoCalmCalmCalmCalmCalmCalmCalmCalmE33SE3E6E8SE5SE8SE6SE6S6SE8S6S3SE6E6E4

Tide / Current Tables for Puerto Maunabo, Puerto Rico
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Puerto Maunabo
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Fri -- 12:33 AM AST     -0.43 feet Low Tide
Fri -- 06:46 AM AST     Moonrise
Fri -- 06:57 AM AST     Sunrise
Fri -- 10:46 AM AST     0.50 feet High Tide
Fri -- 01:30 PM AST     0.43 feet Low Tide
Fri -- 05:44 PM AST     New Moon
Fri -- 06:09 PM AST     Moonset
Fri -- 06:13 PM AST     Sunset
Fri -- 06:36 PM AST     0.46 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.4-0.4-0.4-0.3-0.2-00.10.30.40.50.50.50.50.40.40.40.40.40.50.50.40.30.1-0.1

Tide / Current Tables for Vieques Passage, Puerto Rico Current
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Vieques Passage
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Fri -- 01:46 AM AST     -0.00 knots Slack
Fri -- 04:22 AM AST     -0.37 knots Max Ebb
Fri -- 06:45 AM AST     Moonrise
Fri -- 06:47 AM AST     0.00 knots Slack
Fri -- 06:56 AM AST     Sunrise
Fri -- 10:27 AM AST     0.75 knots Max Flood
Fri -- 01:41 PM AST     -0.00 knots Slack
Fri -- 05:17 PM AST     -0.91 knots Max Ebb
Fri -- 05:44 PM AST     New Moon
Fri -- 06:07 PM AST     Moonset
Fri -- 06:11 PM AST     Sunset
Fri -- 09:09 PM AST     0.00 knots Slack
Fri -- 11:45 PM AST     0.45 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.2-0-0.2-0.4-0.3-0.20.10.30.60.70.70.60.3-0.1-0.5-0.8-0.9-0.9-0.7-0.4-0.10.20.4

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (21,6,7,8)
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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.