Monday, April6, 2020
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Marine Weather and Tides
La Parguera comunidad, 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 6:16AMSunset 6:43PM Monday April 6, 2020 12:55 AM AST (04:55 UTC) Moonrise 5:29PMMoonset 5:17AM Illumination 97% Phase: Waxing Gibbous; Moon at 13 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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AMZ745 Coastal Waters Of Southwestern Puerto Rico Out 10 Nm- 926 Pm Ast Sun Apr 5 2020
.small craft should exercise caution...
Rest of tonight..East winds 10 to 15 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 12 seconds. North swell 4 to 5 feet.
Monday..East winds 5 to 10 knots veering south in the afternoon. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 11 seconds. North swell 4 to 6 feet.
Monday night..Northeast winds 10 to 15 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 11 seconds. North swell 4 to 6 feet. Isolated showers.
Tuesday..Northeast winds 5 to 10 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. North swell 4 to 5 feet.
Tuesday night..Northeast winds 5 to 10 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. Isolated showers through the night.
Wednesday..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Isolated showers.
Thursday..East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 10 seconds. Isolated showers.
Friday..Southeast winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 10 seconds. Isolated showers.
AMZ700 926 Pm Ast Sun Apr 5 2020
Synopsis for puerto rico and the uS. Virgin islands waters... Hazardous marine conditions will continue across the atlantic waters and local passages through Monday due to a northerly swell. Shower development will continue over portions of the atlantic waters and local passages mainly between eastern puerto rico and the virgin islands as a frontal boundary and upper level trough will linger across the region.


7 Day Forecast for Marine Location Near La Parguera comunidad, PR
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location: 17.97, -67.05     debug


Area Discussion for - San Juan, PR
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FXCA62 TJSJ 060232 RRA AFDSJU

Area Forecast Discussion . DELAYED National Weather Service San Juan PR 1032 PM AST Sun Apr 5 2020

UPDATE. Some modifications to the short term grids based on present and expected weather conditions. Afternoon convection lead to the issuance of urban and small stream advisory, and a Flood warning over parts of the central and east interior as well as the San Juan Metro respectively. Estimated rainfall amounts were between 1 to 3 inches in some areas with the heaviest rainfall. The lingering frontal boundary/shearline and the proximity of an upper trough and jet segment created sufficient moisture convergence and instability aloft to support continued convective development into the late evening hours across Puerto Rico. Elsewhere only a few showers were detected mainly over the coastal waters. Recent TJSJ 06/00Z upper air sounding was fairly moist below 700 millibars, with PWAT values increasing to near 2.0 inches. This was somewhat contaminated due to the afternoon convection. However it did suggest low level winds were more east northeast below 700 millibars, then becoming more westerly and increasing with height above. This along with the recent water vapor imagery suggests that the region was now located at base of upper trough axis.

Sufficient moisture availability along with local and diurnal y effects will again lead to afternoon convection across portions of the islands. Ponding of water on roadways and in poor drainage areas will again be possible as well as a chance for minor urban ad small stream flooding in isolated areas.

AVIATION. Prevailing VFR at all terminals. Frontal boundary across the region will favor SCT-BKN cld lyrs nr FL025 . FL050 . FL080 with SHRA psbl isold TSRA ovr ATL waters and enroute btw PR and USVI. Few tops btw FL200-FL250 vcty +SHRA/Isold TSRA. SFC wnds lgt/vrb . increasing 10-15 kts aft 06/14z with sea breeze variations.

MARINE UPDATE. No change to previous marine discussion. Hazardous marine conditions will continue across the Atlantic waters and local passages through Monday due to the arrival of long period northerly swell action. Shower development and possibly isolated thunderstorms will remain possible across portions of the local waters overnight.

PREV DISCUSSION. /issued 345 PM AST Sun Apr 5 2020/

SYNOPSIS . A weakening cold front will bring a few showers to the area through early in the workweek. A northerly swell is causing hazardous seas and dangerous coastal conditions as well. This frontal boundary is forecast to once again result in shower activity by mid-week.

SHORT TERM . Rest of Today through Tuesday .

Similar to yesterday, a few showers have developed over the interior of Puerto Rico due to lingering moisture associated with a dying cold front. Light winds at low levels are causing these showers to be quite slow, so there will be a threat into the early evening hours of ponding of water on roadways and low-lying areas.

Heading into the workweek, we will see a trend towards a more normal weather pattern. Currently, a large polar trough dominates the mid- to upper-levels of the atmosphere over the Atlantic, with its associated large surface low also well established over the central Atlantic. On Monday, the trough and surface low will head off towards the east, and high pressure will once again build to our north by midweek. Furthermore, mid-level temperatures will begin to warm Monday into Tuesday as a ridge builds to our east, with a weak inversion forming at lower levels in forecast model soundings. This of course will suppress cloud development, and only allow for weak showers on Tuesday.

Thus, isolated to scattered showers will continue into the nighttime, with isolated showers overnight over the local waters but not so much over land. Tomorrow afternoon will likely be similar to this afternoon with a chance for scattered showers over the interior of Puerto Rico, since atmospheric conditions don't change substantially between now and tomorrow afternoon. However, on Tuesday, with warmer temperatures aloft, less CAPE, and weaker lapse rates, weaker afternoon showers will result in the afternoon hours.

LONG TERM . Wednesday through Monday .

High pressure at the surface will continue to shift eastward into the central Atlantic ocean. At the same time the old cold front will still be near the area in the form of a shear line. This will provide a focal point--or line--for shower activity.

Low level flow will shift from east northeast on Wednesday to southeast on Thursday. At least a modest southerly component in the easterly flow will continue at lower levels during the weekend and into the next week. The old boundary will finally lift north on Saturday to complete a warming and drying trend begun on Friday and peaking on Saturday.

Upper level flow will be mostly west northwest through much of this week, but will become more northerly as a weak trough forms southeast of the area and high pressure ridges in from the southwest across the central Caribbean and into Puerto Rico. Without a strong upper low nearby, 500 mb temperatures will remain too warm for serious convection in an atmosphere that remains dry at mid and upper levels for the entire period, so thunderstorms are not expected.

These conditions will, however, be favorable for late night and early morning showers in eastern Puerto Rico, favoring the eastern and southeastern slopes. During the afternoon flow will favor shower generations along and north of the Cordillera Central. Because flow at mid levels is westerly and reaches as low as 850 mb, showers will tend to favor central and east central Puerto Rico during the afternoons, even though showers in west and northwest Puerto Rico will occur from time to time. The best showers should be seen Wednesday through Friday.

AVIATION . SHRA will develop over the west and central portions of PR thru 06/02z. Some VCSH possible at JBQ/JSJ/JMZ/JPS. VFR conds are expected to prevail thru much of the forecast. IST/ISX/KPK can expect isolated rains at times, especially after 06/00z. Winds will be dominated by sea breeze variations between 5-15 knots, becoming calm to light and VRB aft 05/23z, and returning from the NE at 10-15 kt after 06/13z.

MARINE . Hazardous seas continue with seas up to 8 feet and winds up to 15 knots over the Atlantic waters and Caribbean Passages. Small craft advisories are in effect through Monday evening. Seas will gradually improve by Tuesday. At the beaches, high rip current risk continues for the north-facing beaches of the islands and for the eastern-tip of St. Croix.

PRELIMINARY POINT TEMPS/POPS. SJU 75 86 75 84 / 40 30 40 40 STT 75 82 74 85 / 40 50 40 40

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

High Surf Advisory until 8 AM AST Monday for Culebra-North Central-Northeast-Northwest-San Juan and Vicinity-Southeast.

High Rip Current Risk through Tuesday afternoon for Culebra.

VI . High Rip Current Risk until 8 AM AST Monday for St Croix.

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

AM . Small Craft Advisory until 8 PM AST Monday for Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N-Coastal Waters of Northern Puerto Rico out 10 NM-Coastal Waters of Northern USVI and Culebra out 10 NM-Coastal Waters of Northwestern Puerto Rico out 10 NM-Mona Passage Southward to 17N.



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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MGIP4 - 9759110 - Magueyes Islands, PR 0 mi55 min Calm G 1.9 81°F 83°F1015.9 hPa (+0.0)
MGZP4 - 9759394 - Mayaguez, PR 18 mi61 min 77°F 84°F1017.3 hPa
42085 - Southeast of Ponce, PR 28 mi115 min E 12 G 14 82°F 82°F2 ft1015.5 hPa (+0.9)
PTRP4 29 mi25 min E 5.1 G 7 76°F
41115 - Rincon, Puerto Rico (181) 31 mi25 min 82°F7 ft
AROP4 - 9757809 - Arecibo, PR 40 mi55 min E 5.1 G 7
JOXP4 - Jobos Bay Reserve, Puerto Rico 44 mi70 min Calm 80°F 1018 hPa71°F
MISP4 - 9759938 - Mona Island, PR 48 mi55 min 78°F 80°F1017.2 hPa (+0.6)

Wind History for Magueyes Island, PR
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Airport Reports
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Tide / Current Tables for Magueyes Island, Caribbean Sea, Puerto Rico
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Magueyes Island
Click for Map
Mon -- 05:16 AM AST     Moonset
Mon -- 06:18 AM AST     Sunrise
Mon -- 08:14 AM AST     0.45 feet High Tide
Mon -- 03:20 PM AST     0.20 feet Low Tide
Mon -- 05:29 PM AST     Moonrise
Mon -- 06:42 PM AST     Sunset
Mon -- 08:13 PM AST     0.28 feet High 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 Guanica, Puerto Rico
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Guánica
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Mon -- 05:16 AM AST     Moonset
Mon -- 06:17 AM AST     Sunrise
Mon -- 07:22 AM AST     0.64 feet High Tide
Mon -- 10:36 AM AST     0.26 feet Low Tide
Mon -- 05:28 PM AST     Moonrise
Mon -- 06:42 PM AST     Sunset
Mon -- 07:14 PM AST     0.74 feet High Tide
Mon -- 11:19 PM AST     0.16 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 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.
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Wind Forecast for (0,6,7,8)
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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.