Friday, February21, 2020
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Marine Weather and Tides
Cata�o, 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 6:47AMSunset 6:28PM Friday February 21, 2020 11:47 AM AST (15:47 UTC) Moonrise 5:32AMMoonset 4:56PM Illumination 5% Phase: Waning Crescent; Moon at 28 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- 1018 Am Ast Fri Feb 21 2020
Rest of today..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 8 seconds.
Tonight..Southeast winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 9 seconds. Isolated showers.
Saturday..Southeast winds 5 to 10 knots backing northeast in the afternoon. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds.
Saturday night..South winds 5 to 10 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 11 seconds. Northeast swell around 4 feet after midnight.
Sunday..West winds 5 to 10 knots. Seas 5 to 7 feet with occasional seas up to 9 feet. Dominant period 11 seconds. North swell 4 to 7 feet. Scattered showers.
Monday..East winds 10 to 15 knots. Seas 5 to 7 feet with occasional seas up to 9 feet. Dominant period 10 seconds. North swell 4 to 7 feet. Scattered showers.
Tuesday..East winds 10 to 15 knots. Seas 5 to 7 feet with occasional seas up to 9 feet. Dominant period 10 seconds. Scattered showers.
AMZ700 1018 Am Ast Fri Feb 21 2020
Synopsis for puerto rico and the uS. Virgin islands waters... Easterly winds will drop the rest of today and will continue on Saturday, and marine conditions will slowly improve. However, by Sunday through early next week, seas are expected to become hazardous once again as a northerly swell invades the atlantic waters and local passages.


7 Day Forecast for Marine Location Near Cata?o, PR
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location: 18.46, -66.12     debug


Area Discussion for - San Juan, PR
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FXCA62 TJSJ 211506 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 1106 AM AST Fri Feb 21 2020

UPDATE. Today's RAOB data and satellite images depicted a dry air mass over the region. A strong trade wind inversion was observed at around 800mb. Therefore, USVI and PR can expect hazy skies and a mixture of sunshine with isolated passing clouds. However, showers may develops over the mountain areas of west Puerto Rico during the afternoon. A trade wind perturbation will continue to move well south of the region across the Caribbean waters.

AVIATION. VFR conditions can be expected today. Hazy conditions will persist today, but with VIS above 6SM. SHRA will develop across the mountain areas of west PR btwn 21/18-22/00z, but no significant impact is anticipated at this time. Winds will range between 10 and 15 knots out from the east, becoming calm to light and VRB after 21/23z.

MARINE. Conditions will slowly improve across the local waters, but mariners can expect seas between 5 and 7 feet across the offshore Atlantic waters of PR/USVI. The small craft advisory will continue until 2 pm AST across this area. Elsewhere, expect seas at 5 feet or less. A northerly swell will reach propagate across the Atlantic Waters and Mona Passage by Sunday.

PREV DISCUSSION. /issued 551 AM AST Fri Feb 21 2020/

SYNOPSIS .

Mostly fair weather conditions prevail through much of the day today across the local islands, though isolated to scattered showers are expected in the afternoon over western and interior Puerto Rico. Hazy skies will also persist over the area today. Shower activity is expected to remain relatively limited as we enter the weekend, picking up Sunday into Monday with the approach of a frontal boundary.

SHORT TERM . Today through Sunday .

Hazy skies will continue today across the region and mostly fair weather conditions are expected to prevail with isolated to locally scattered afternoon shower development over portions of central and western Puerto Rico. Drier air will continue to limit shower development across the islands through Saturday. Low level moisture starts to increase somewhat on Sunday, as an upper level trough and associated frontal boundary at the surface across the western Atlantic moves further into the central Atlantic. This pattern will induce a prefrontal trough late in the weekend across the region and turn winds more from the south/southeast. Therefore, expect shower activity to gradually increase across the islands on Sunday. However, no significant rainfall amounts are anticipated at this moment. A long period northerly swell will increase seas and the risk of rip currents across the north facing beaches of the islands on Sunday.

LONG TERM . Monday through Saturday .

On Monday morning, a decaying cold front will be draped across the northwestern parts of the region. This will bring continuing increased moisture to the area, with precipitable water levels near or above seasonal normals - the 0Z run of the GFS shows levels around 1.2 to 1.8 inches. Meanwhile, the remnants of an old frontal boundary will approach the region from the east, embedded in the trade winds, contributing to low-level moisture convergence across the area. Furthermore, weak troughing at the mid-levels will allow for a greater vertical extent of this moisture, to around 500 hPa, though instability aloft will likely not be sufficient to sustain convective activity. These factors will allow for increased shower activity, with the potential for locally heavy rainfall, though flooding does not appear to be a major concern at this time.

On Tuesday, a slow, gradual drying trend will begin. The mid-level trough will also pull away from the area, increasing stability aloft. As such, decreasing shower activity is expected, a trend that will continue through the end of the week. Moisture is likely to remain near seasonal normal levels Tuesday into Wednesday, and showers continue to be likely, both passing showers during the morning and overnight, affecting windward parts of the local islands, and afternoon showers due to local effects and diurnal heating. The drying becomes more pronounced during the second half of the week and into the weekend, and the inhibited shower activity is likely to lead to generally stable conditions over the local islands. There will, however, likely be sufficient moisture in the low levels to support some, likely isolated, shower activity, especially during the afternoon caused by sea breeze convergence and daytime heating.

AVIATION .

Mainly VFR conditions are expected to prevail across all terminals during the next 24 hours. Brief MVFR cigs possible from 16z-21z at TJMZ/TJBQ due to SHRA. East winds at 10-15 knots with higher gusts and sea breeze variations expected after 14z.

MARINE .

Winds are subsiding somewhat, though there remains moderate easterly trade winds across the regional waters. And, with the slowing winds, seas are also subsiding. Wave heights to around 6 feet are likely for portions of the local waters, including offshore waters and local passages; seas to 7 feet are still expected into this afternoon in the offshore Atlantic waters. Conditions will continue to improve into Saturday. However, another northerly swell is expected to arrive in the local waters early on Sunday, at which point seas are expected to once again turn hazardous. For beachgoers, there remains a moderate risk of rip currents across most of the local beaches in the north and southeast of Puerto Rico, as well as St. Croix, St. Thomas, Vieques, and Culebra; there is otherwise a generally low risk of rip currents elsewhere.

PRELIMINARY POINT TEMPS/POPS. SJU 85 73 87 73 / 0 0 0 10 STT 83 71 82 71 / 10 0 10 20

SJU WATCHES/WARNINGS/ADVISORIES. PR . Red Flag Warning until 6 PM AST this evening for South Central Coastal Plains.

VI . None.

AM . Small Craft Advisory until 2 PM AST this afternoon for Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N.



SHORT TERM . CAM PUBLIC DESK . LIS


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SJNP4 - 9755371 - San Juan, PR 0 mi54 min E 9.9 G 13 80°F 80°F1018.3 hPa
41053 - San Juan, PR 1 mi48 min E 12 G 14 80°F 80°F4 ft1017.1 hPa (+0.9)
AROP4 - 9757809 - Arecibo, PR 31 mi54 min NE 9.9 G 15
YABP4 - 9754228 - Yabucoa Harbor, PR 32 mi54 min 84°F 69°F
JOXP4 - Jobos Bay Reserve, Puerto Rico 35 mi63 min E 5.1 85°F 1019 hPa68°F
41056 37 mi48 min E 12 G 14 79°F 80°F3 ft1017.4 hPa (+1.1)
ESPP4 - 9752695 - Esperanza, PR 43 mi54 min ESE 8.9 G 14 83°F 78°F1018.7 hPa
CLBP4 - 9752235 - Culebra, PR 45 mi54 min 82°F 80°F1018.5 hPa
42085 - Southeast of Ponce, PR 46 mi108 min E 16 G 19 79°F 80°F4 ft1016.8 hPa (+1.8)

Wind History for San Juan, PR
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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Click EDIT to select an airport
Tide / Current Tables for San Juan, La Puntilla, San Juan Bay, Puerto Rico
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Boca De Cangrejos, Isla Verde, San Juan, Puerto Rico
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Boca De Cangrejos
Click for Map
Fri -- 01:22 AM AST     -0.09 feet Low Tide
Fri -- 05:31 AM AST     Moonrise
Fri -- 06:48 AM AST     Sunrise
Fri -- 08:40 AM AST     1.46 feet High Tide
Fri -- 03:05 PM AST     0.46 feet Low Tide
Fri -- 04:56 PM AST     Moonset
Fri -- 06:26 PM AST     Sunset
Fri -- 07:55 PM AST     0.90 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0-0.1-0.10.10.30.711.31.41.51.41.10.90.70.50.50.50.60.70.90.90.80.70.5

Weather Map
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wmap_A
GEOS Local Image of Puerto Rico    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 (10,2,3,4)
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Ground Weather Radar Station Puerto Rico,Virgin Islands
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Disclaimer:
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.