Friday, December6, 2019
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Marine Weather and Tides
Naranjito, PR

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:41AMSunset 5:48PM Friday December 6, 2019 7:25 AM AST (11:25 UTC) Moonrise 2:14PMMoonset 1:48AM Illumination 71% Phase: Waxing Gibbous; Moon at 9 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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AMZ712 Coastal Waters Of Northern Puerto Rico Out 10 Nm- 408 Am Ast Fri Dec 6 2019
Today..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. Scattered showers.
Tonight..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. Isolated showers.
Saturday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 9 seconds. Isolated showers.
Saturday night..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Isolated showers.
Sunday..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. Scattered showers.
Monday..East winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 8 seconds. Isolated showers.
Tuesday..East winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 7 seconds. Isolated showers.
AMZ700 408 Am Ast Fri Dec 6 2019
Synopsis for puerto rico and the uS. Virgin islands waters... Moderate east southeast winds are expected to become more easterly today and persist through the weekend. This will create a light to moderate chop across portions of the local waters and passages. Passing showers are expected to continue over the local waters during the rest of the early morning. Another northerly swell is forecast to move across the atlantic and caribbean passages late Sunday into Monday. This along with increasing east to northeast winds will create choppy and hazardous seas.


7 Day Forecast for Marine Location Near Naranjito, PR
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location: 18.31, -66.18     debug


Area Discussion for - San Juan, PR
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FXCA62 TJSJ 060815 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 415 AM AST Fri Dec 6 2019

SYNOPSIS. A gradual drying trend is expected to continue today and through the weekend as a mid to upper level ridge will strengthen and hold across the region. This in turn will increase the trade wind cap inversion and limit shower and thunderstorm development across the forecast area. However, locally and diurnally induced convection is expected to develop during the afternoons, but due to modest instability and shallow moisture showers are expected to be short- lived. Increasing east to northeast trade winds is expected over the next several days as the surface high pressure ridge will build and spread across the Atlantic north and east of the region.

SHORT TERM. Today through Sunday . A mid-level ridge is expected to hold over the area through the short-term forecast period. As a result of this feature and dry air at the mid levels, the trade wind cap will strengthen. Therefore, thunderstorm formation is not favored across the area. Winds will remain out of the east to east-northeast and, under this flow however, patches of moisture at the low levels will continue to move across the region. For each day, passing showers will move across portions of eastern Puerto Rico and the U.S. Virgin Islands during the overnight and morning hours. Then, in the afternoon, due to the available moisture, diurnal heating and local effects, showers are expected to develop across the interior and western Puerto Rico.

In terms of temperatures, a more easterly to east-northeast wind flow means that temperature will be slightly cooler over the area than what has been observed during the previous days. Normal highs for this of year are between 84 to 86 degrees.

LONG TERM. Monday through Saturday .

Recent model guidance continued to suggest a better chance for showers and isolated thunderstorms by Monday and possibly on Tuesday, as the east to northeast trade winds will increase low level moisture convergence across the forecast area. In addition, the mid to upper level ridge is forecast to slightly erode as a polar trough moves across the west Atlantic and north of the region. The breaking down of the upper ridge will weaken the trade wind cap inversion and support better chance for afternoon shower development across the islands. Most of the moisture however will be advective and brought in from old frontal remnants north of the region. Therefore no significant or widespread rainfall accumulations are anticipated over land areas at this time.

During the latter part of the period through Friday, an upper level ridge is again forecast to build over the region. At the same time the local pressure gradient will tighten and consequently winds will increase and become more northeasterly due strong surface high pressure ridge north of the region, and a weak induced surface trough forecast to develop northeast of the area over the tropical Atlantic. This will also promote more frequent morning passing showers which should affect the northern and eastern half of Puerto Rico, as well as the U.S. Virgin Islands. In addition late Friday through Saturday, weak perturbation in the prevailing trades will bring an increase in low level moisture and therefore increase the chance for shower development during the early morning and afternoon hours.

AVIATION. VFR conditions are expected across all terminals. Passing showers are expected across the area through 06/16Z. After 06/18Z, SHRA could briefly reduce visibility to MVFR across TJMZ/TJBQ. Winds will be out of the ENE at 5 to 15 knots.

MARINE. Moderate easterly winds are expected to persist through the weekend. This will create a light to moderate chop across portions of the local waters and passages through today.Another northerly swell is forecast to move across the Atlantic and Caribbean Passages late Sunday into Monday. This along with increasing east to northeast winds will create choppy and hazardous seas. In the meantime, local seas will be up to 5 feet for the next few days with easterly winds up to 15 knots. There is a low or moderate risk of rip currents across the local beaches.

PRELIMINARY POINT TEMPS/POPS. SJU 88 76 85 75 / 40 30 20 30 STT 86 76 85 74 / 20 30 30 40

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

SHORT TERM . ERG LONG TERM . RAM PUBLIC DESK . ERG


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SJNP4 - 9755371 - San Juan, PR 11 mi56 min SSE 2.9 G 4.1 79°F 84°F1016.2 hPa
41053 - San Juan, PR 12 mi86 min S 3.9 G 5.8 80°F 84°F4 ft1014.8 hPa (-0.5)
JOXP4 - Jobos Bay Reserve, Puerto Rico 25 mi101 min Calm 76°F 1017 hPa71°F
YABP4 - 9754228 - Yabucoa Harbor, PR 25 mi56 min 77°F 74°F
AROP4 - 9757809 - Arecibo, PR 30 mi56 min ESE 5.1 G 6
42085 - Southeast of Ponce, PR 36 mi86 min NE 7.8 G 9.7 82°F 84°F3 ft1014.6 hPa (-0.3)
41056 38 mi86 min E 12 G 14 82°F 83°F3 ft1014.7 hPa (+0.0)
ESPP4 - 9752695 - Esperanza, PR 40 mi56 min ESE 7 G 9.9 83°F 83°F1016.4 hPa
CLBP4 - 9752235 - Culebra, PR 47 mi62 min 80°F 85°F1016.1 hPa

Wind History for San Juan, PR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Juan, Luis Munoz Marin International Airport, PR13 mi90 minSE 310.00 miPartly Cloudy79°F73°F84%1015.9 hPa

Link to 5 minute data for TJSJ

Wind History from JSJ (wind in knots)
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Last 24hrCalmCalmE33CalmE9SE7
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S8S76E7E5E4CalmCalmCalmCalmCalmCalmCalmCalmCalmSE3Calm
1 day agoCalmSE3NE4N6CalmNE8N7S7S9S7SE4S5CalmCalmCalmCalmSE3SE3CalmCalmCalmCalmCalmCalm
2 days agoCalmS3S6S64SE7SE8S7
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4SE7S3S53S3CalmCalmCalmCalmCalmCalmCalmCalm

Tide / Current Tables for San Juan, Puerto Rico (3)
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San Juan
Click for Map
Fri -- 01:48 AM AST     Moonset
Fri -- 04:58 AM AST     1.21 feet High Tide
Fri -- 06:43 AM AST     Sunrise
Fri -- 10:42 AM AST     0.63 feet Low Tide
Fri -- 02:13 PM AST     Moonrise
Fri -- 04:34 PM AST     1.27 feet High Tide
Fri -- 05:47 PM AST     Sunset
Fri -- 11:08 PM AST     0.30 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.70.911.21.21.210.90.70.60.60.70.811.21.31.31.210.80.50.40.3

Tide / Current Tables for San Juan, Puerto Rico (2) (expired 1998-12-31)
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San Juan
Click for Map
Fri -- 01:48 AM AST     Moonset
Fri -- 04:57 AM AST     1.22 feet High Tide
Fri -- 06:43 AM AST     Sunrise
Fri -- 10:39 AM AST     0.62 feet Low Tide
Fri -- 02:13 PM AST     Moonrise
Fri -- 04:33 PM AST     1.30 feet High Tide
Fri -- 05:47 PM AST     Sunset
Fri -- 11:10 PM AST     0.29 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.60.811.21.21.210.90.70.60.60.70.811.21.31.31.210.80.50.40.3

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 (6,6,7,8)
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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 numerious 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.