Saturday, January23, 2021
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Marine Weather and Tides
Ponce, 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 6:59AMSunset 6:17PM Saturday January 23, 2021 3:31 AM AST (07:31 UTC) Moonrise 2:01PMMoonset 2:29AM Illumination 75% 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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AMZ735 Coastal Waters Of Southern Puerto Rico Out 10 Nm- 805 Pm Ast Fri Jan 22 2021
Rest of tonight..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 8 seconds. Isolated showers through the night.
Saturday..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 10 seconds.
Saturday night..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 8 seconds. Isolated showers.
Sunday..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 8 seconds. Isolated showers.
Sunday night..Northeast winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 8 seconds. Isolated showers.
Monday..Northeast winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Isolated showers.
Tuesday..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Isolated showers.
Wednesday..Northeast winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Isolated showers.
AMZ700 805 Pm Ast Fri Jan 22 2021
Synopsis for puerto rico and the uS. Virgin islands waters... Light to moderate winds are expected across the local waters during the next few days. A small northerly swell will continue to invade the atlantic waters through early Saturday, creating choppy seas. Tranquil marine conditions are expected then on Sunday and Monday, with another swell creating hazardous seas by early next week across the atlantic.


7 Day Forecast for Marine Location Near Ponce, PR
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location: 17.97, -66.62     debug


Area Discussion for - San Juan, PR
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FXCA62 TJSJ 230044 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 844 PM AST Fri Jan 22 2021

UPDATE. Light afternoon showers persisted through the evening hours over portions of the western interior and western Puerto Rico. Rainfall accumulations were less than a quarter of an inch, with the highest amounts observed in Lares and Hormigueros. Elsewhere, it was mainly clear with a few showers lingering over the western waters of the U.S. Virgin Islands. For the rest of tonight, fair weather conditions are expected to prevail as drier air and stable conditions aloft continue across the region. Minimum temperatures are forecast to range from the mid 50s across the higher elevations to the low 70s across the lower elevations in Puerto Rico and from the high 60s to low 70s across the USVI.

The 23/00z SJU upper air sounding indicated a layer of moisture trapped below 850 mb and light easterly steering winds. This shallow layer of moisture will continue through at least Saturday morning, before increasing slightly during the afternoon hours when diurnally induced showers are expected to develop over the interior and southwestern sections of PR.

AVIATION Update. Mainly VFR conditions are expected to prevail across all terminals during the next 24 hours. Light and variable winds are expected overnight, increasing 8-12 kts from the east after 23/14z with sea breeze variations.

MARINE Update. A long period northerly swell will continue to fill tonight into Saturday morning across the Atlantic waters and passages. This will keep seas between 4-6 feet across these waters, elsewhere, seas are expected to remain between 2-5 feet in general. Light to moderate easterly winds will continue through Saturday, turning more from the northeast by Saturday night. The swell will also cause a high risk of rip currents along the northern beaches of Puerto Rico through Saturday afternoon. Please refer to the latest Coastal Hazard Message (CFWSJU) and surf zone forecast (SRFSJU) for more details.

PREV DISCUSSION. /issued 354 PM AST Fri Jan 22 2021/

SYNOPSIS . Only limited rainfall activity is anticipated through the next several days as small patches of moisture move across the islands. No significant rainfall events are expected during the next several days. A small northerly swell will result in High Rip Current Risk for the northern coast of Puerto Rico through Saturday.

SHORT TERM . Tonight through Sunday

A mid to upper level trough continues over the north-central Atlantic, but will continue to move away during the weekend. At the mean time, a mid-level ridge building over the northwestern Caribbean will extend its hold over the region. As a result, the trade wind cap inversion is expected to restrengthen, thus trapping all the moisture to the lower levels of the atmosphere. At the surface, high pressure is expected to build near the Bahamas, resulting in a northeasterly wind flow through the weekend.

Moisture content is expected to remain limited, with precipitable water values around 1.1 to 1.4 on Saturday, and near 1.0 inch on Sunday. Under a northeasterly wind flow, advective showers may affect portions of the U.S. Virgin Islands and eastern Puerto Rico in the overnight and early morning hours. Then, as is usual, afternoon convection could develop across southwestern Puerto Rico. Due to the lack of mid and upper level support, and the limited available moisture, only moderate rainfall accumulation is anticipated. Additionally, this wind flow will result in seasonable temperatures will continue across the region. Highs will reach the mid 80s at lower elevations and the upper 70s in the mountain; lows will drop into the upper 50s and low 60s at the mountain, and the mid and upper 70s at the coast.

LONG TERM . Monday through Friday .

Model guidance continues to suggest that mainly fair and stable weather conditions will dominate the local area through most of the long-term forecast period, with patches of low-level moisture generating brief periods of cloudiness and isolated to scattered shower activity from time-to-time. The frequency of patches of low-level moisture may increase by midweek as the remnants of an old frontal boundary drift into the forecast area. However, model guidance does not suggest significant moisture content, with model-estimated precipitable water vapor briefly peaking around 1.30 inches by Thursday afternoon. Mid-level ridging will promote subsidence and drier air aloft, conditions that will also limit any chance for organized convective development. That said, significant wetting rains are not anticipated through at least Friday afternoon, which will continue to support further deterioration of soils and fuels moisture, while promoting favorable fire weather conditions.

Thereafter, model guidance suggests that the remnants of yet another frontal boundary will drift into the forecast area by Friday night. Under somewhat favorable conditions aloft and enhanced moisture content, there may be a higher chance for significant wetting rains. However, it is too soon and there is low confidence in the impacts, if any, this feature could bring to our area.

AVIATION. VFR SCT lyrs nr FL025. FL050 . SKC ABV. Isold SHRA ovr regional waters mainly btw Eastern PR and USVI. Sfc wnds fm E-NE 5 to 15 mph with sea breeze variations . bcmg lgt/vrb to calm aft 22/23Z. No sig operational wx impacts durg prd.

MARINE . A small northerly swell will continue to create choppy seas through early tomorrow across the Atlantic waters. Then, tranquil seas are expected for the rest of the weekend. Another northerly swell is anticipated by early next week. Winds are expected to remain generally light to moderate. For the beaches, a high rip current risk is expected through tomorrow for northern Puerto Rico.

PRELIMINARY POINT TEMPS/POPS. SJU 73 85 75 83 / 20 20 20 20 STT 72 83 72 84 / 20 20 20 20

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

VI . None. AM . None.

Update . DSR Short Term . ERG Public Desk . LIS


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
42085 - Southeast of Ponce, PR 8 mi91 min NE 9.7 G 9.7 78°F 80°F2 ft1015 hPa (-1.1)
JOXP4 - Jobos Bay Reserve, Puerto Rico 21 mi106 min Calm 71°F 1018 hPa66°F
MGIP4 - 9759110 - Magueyes Islands, PR 23 mi43 min ENE 1 G 2.9 74°F 80°F1015.7 hPa
MGZP4 - 9759394 - Mayaguez, PR 33 mi49 min 75°F 82°F1016.4 hPa
PTRP4 43 mi21 min ESE 5.1 G 6 73°F
SJNP4 - 9755371 - San Juan, PR 43 mi43 min S 4.1 G 5.1 76°F 81°F1016 hPa
41053 - San Juan, PR 44 mi31 min S 3.9 G 5.8 76°F 80°F5 ft1014.8 hPa (-1.2)
41115 - Rincon, Puerto Rico (181) 45 mi35 min 81°F4 ft

Wind History for Penuelas (Punta Guayanilla), PR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure

Link to 5 minute data for TJPS

Wind History from JPS (wind in knots)
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Last 24hr--------------------------------------E5NE5NE5--Calm
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Tide / Current Tables for Playa de Ponce, Puerto Rico
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Playa de Ponce
Click for Map
Sat -- 02:29 AM AST     Moonset
Sat -- 07:00 AM AST     Sunrise
Sat -- 08:40 AM AST     0.51 feet High Tide
Sat -- 02:00 PM AST     Moonrise
Sat -- 06:16 PM AST     Sunset
Sat -- 08:23 PM AST     -0.28 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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Tide / Current Tables for Playa Cortada, Puerto Rico
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Playa Cortada
Click for Map
Sat -- 02:29 AM AST     Moonset
Sat -- 07:00 AM AST     Sunrise
Sat -- 08:57 AM AST     0.51 feet High Tide
Sat -- 01:59 PM AST     Moonrise
Sat -- 06:15 PM AST     Sunset
Sat -- 07:59 PM AST     -0.28 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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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
Ground Weather Radar Station




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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.