Saturday, August8, 2020
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Marine Weather and Tides
Santa Isabel, 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 6:06AMSunset 6:58PM Saturday August 8, 2020 4:57 AM AST (08:57 UTC) Moonrise 10:26PMMoonset 10:09AM Illumination 81% Phase: Waning Gibbous; Moon at 19 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- 400 Am Ast Sat Aug 8 2020
.small craft should exercise caution...
Today..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated showers.
Tonight..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated showers through the night.
Sunday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated showers.
Sunday night..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated showers through the night.
Monday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers.
Tuesday..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 15 to 20 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Scattered showers. Isolated Thunderstorms.
AMZ700 400 Am Ast Sat Aug 8 2020
Synopsis for puerto rico and the uS. Virgin islands waters... Moderate to fresh easterly wind flow is expected across the regional waters for the next couple of days. Choppy seas of up to 5 feet will persist across the expose waters. The southern portion of the caribbean waters and the Mona passage will have seas up to 6 feet through Sunday. Seas will again be below 5 feet early next week.


7 Day Forecast for Marine Location Near Santa Isabel, PR
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location: 17.98, -66.4     debug


Area Discussion for - San Juan, PR
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FXCA62 TJSJ 080843 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 443 AM AST Sat Aug 8 2020

SYNOPSIS.

A mid-to-upper level ridge will build and hold aloft through the upcoming week. A dry air mass with African dust particles will limit shower activity and produce hazy skies the next few days. However, overnight and early morning showers across the windward sections followed by afternoon convection across the western sections will affect the islands each day. Warm to hot temperatures will persist through the next few days. The next tropical wave is forecast to arrive by the middle of next week.

SHORT TERM. Today through Monday

The weak and fast-moving tropical wave from yesterday is now moving out of the region, and precipitable water values are now dropping. Isolated showers will continue out over the local waters for the next few hours. Winds behind the tropical wave are fairly breezy, and regional buoys are currently seeing this increase in wind speeds. Winds of 10 to 20 knots are expected today from the east.

High pressure currently extends from the lower to upper atmosphere over the western to central Atlantic, and this feature will play a primary role in our weather the next few days. Furthermore, forecast model soundings show that this ridging will really dry out the mid- levels of the atmosphere, thus creating hostile conditions for shower development. The soundings also show warming temperatures at low to mid levels, which also works against showers. Below average precipitable water values are expected today through Monday, generally ranging from 1.3 to 1.6 inches. Finally, mild to moderate amounts of Saharan dust are moving in, and will be with us for the next few days.

To sum up these conditions, the next few days looks quite calm across the region with drier than normal conditions. Very little shower activity is expected today over land, with the best chance being over western Puerto Rico near Mayaguez in the afternoon. Only fairly weak showers are expected. Tomorrow and Monday some low-level moisture moves in from the west, yet given the effects of the ridging, only minimal impacts are expected. Showers will continue to favor western to northwestern Puerto Rico, and these showers will likely be weak. Despite generally unfavorable conditions for strong showers, persistent weak showers over a given area can lead to water ponding. Isolated showers are possible over the local waters, and may impact areas near the coast in eastern Puerto Rico in the nighttime and morning hours.

LONG TERM. Tuesday through Sunday

A mid level high pressure is forecast to be the dominant weather feature through much of the work-week. This feature will promote a dry air mass at mid level, and a persistent trade wind cap. However, a weak tropical wave is now forecast to reach the islands by Wednesday afternoon into the evening. This tropical system will provide the best chance for shower and thunderstorm development across the islands, but doesn't look so impressive at this time.

For the end of the long-term period, which increase the amount of uncertainty about this solution, a more robust tropical wave will provide a better chance for inclement weather across the islands late Friday night or Saturday.

Generally speaking, a seasonal weather pattern will persist across the islands with overnight and early morning showers moving across the local waters and windward sections, followed by afternoon convection over the western portions of the islands. Maximum temperatures will continue in the low 90s mainly over the urban and coastal areas with heat indices from the upper 90s to mid 100s.

AVIATION.

VFR conds are expected to prevail at all terminals for the next 24 hrs. Brief MVFR in SHRA/TSRA psbl btwn 08/17-21Z in wrn PR. Sfc winds E less than 11 kts, bcmg 10-20 kt after 08/14Z, strongest near the coast where sea breezes will influence.

MARINE.

Mariners can expect choppy seas across the Caribbean waters and passages due to a wind surge. Small craft operators should exercise caution across most of the local waters due to winds between 15 and 20 knots. Seas will range between 2 and 5 feet. Early next week, mariners can expect tranquil marine conditions, but local effects will accelerate winds across the Caribbean and Atlantic waters between 15 and 20 knots at times, especially during the afternoon hours. A tropical wave will move across the local waters by the middle of next week, increasing winds and seas, and deteriorating weather conditions.

PRELIMINARY POINT TEMPS/POPS. SJU 90 79 90 79 / 50 30 20 10 STT 90 80 90 80 / 50 10 20 20

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

SHORT TERM . mb LONG TERM . CAM


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
42085 - Southeast of Ponce, PR 10 mi118 min ENE 16 G 19 85°F 85°F1016.1 hPa (-1.5)
JOXP4 - Jobos Bay Reserve, Puerto Rico 10 mi73 min ENE 2.9 82°F 1019 hPa75°F
MGIP4 - 9759110 - Magueyes Islands, PR 34 mi58 min ESE 1.9 G 4.1 82°F 85°F1017.6 hPa (-0.6)
SJNP4 - 9755371 - San Juan, PR 36 mi58 min E 9.9 G 14 83°F 85°F1018 hPa (-1.0)
41053 - San Juan, PR 38 mi118 min ESE 14 G 16 84°F 84°F1016.7 hPa (-1.4)
MGZP4 - 9759394 - Mayaguez, PR 43 mi58 min 77°F 86°F1018.3 hPa (-0.4)

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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Tide / Current Tables for Playa Cortada, Puerto Rico
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Playa Cortada
Click for Map
Sat -- 12:40 AM AST     0.67 feet High Tide
Sat -- 02:20 AM AST     0.39 feet Low Tide
Sat -- 06:06 AM AST     Sunrise
Sat -- 10:09 AM AST     Moonset
Sat -- 12:34 PM AST     0.58 feet High Tide
Sat -- 01:44 PM AST     0.36 feet Low Tide
Sat -- 06:55 PM AST     Sunset
Sat -- 10:26 PM AST     Moonrise
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 de Ponce, Puerto Rico
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Playa de Ponce
Click for Map
Sat -- 12:23 AM AST     0.67 feet High Tide
Sat -- 02:44 AM AST     0.39 feet Low Tide
Sat -- 06:07 AM AST     Sunrise
Sat -- 10:10 AM AST     Moonset
Sat -- 12:17 PM AST     0.58 feet High Tide
Sat -- 02:08 PM AST     0.36 feet Low Tide
Sat -- 06:56 PM AST     Sunset
Sat -- 10:26 PM AST     Moonrise
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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (4,6,7,8)
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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.