Thursday, April2, 2020
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Marine Weather and Tides
Isabela, 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 6:20AMSunset 6:43PM Thursday April 2, 2020 3:25 PM AST (19:25 UTC) Moonrise 1:19PMMoonset 1:57AM Illumination 73% 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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AMZ742 Coastal Waters Of Northwestern Puerto Rico Out 10 Nm- 953 Am Ast Thu Apr 2 2020
Rest of today..South winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 11 seconds. Isolated showers.
Tonight..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Isolated showers.
Friday..Northwest winds 5 to 10 knots backing west in the afternoon. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 11 seconds.
Friday night..South winds 5 to 10 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 11 seconds. North swell 4 to 5 feet. Isolated showers.
Saturday..North winds 5 to 10 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 12 seconds. North swell 4 to 5 feet. Isolated showers.
Sunday..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 7 feet. Isolated showers.
Monday..Northeast winds 10 to 15 knots. Seas 5 to 7 feet with occasional seas up to 9 feet. Dominant period 12 seconds. North swell 4 to 7 feet. Isolated showers.
AMZ700 953 Am Ast Thu Apr 2 2020
Synopsis for puerto rico and the uS. Virgin islands waters... Tranquil marine conditions will continue across the regional waters with seas at 4 feet or less and limited shower activity across the area. Marine conditions are expected to deteriorate, however, as a northerly swell invades the atlantic waters and local waters by Friday evening and into the weekend. Shower activity will pick up as a cold front moves into the area this weekend.


7 Day Forecast for Marine Location Near Isabela zona urbana, PR
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location: 18.5, -67.01     debug


Area Discussion for - San Juan, PR
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FXCA62 TJSJ 021455 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 1055 AM AST Thu Apr 2 2020

UPDATE.

Only a few light showers were observed this morning in the SW corner of Puerto Rico, in what has otherwise been a calm day. Dry air continues over the region, with precipitable water values well below average between .9 to 1.1 inches. Some showers are possible this afternoon for central and northwestern Puerto Rico, but any shower activity will have minimal impact. A cold front will approach the region tomorrow, and some moisture ahead of the front will likely interact with surface heating to produce more showers compared to today. That increasing trend in rain will continue into the weekend as the cold front moves over the top of us and will stall and weaken into Monday. Thus, scattered showers are expected for the weekend, and there will be the possibility of urban and small stream flooding where the most persistent shower activity occurs.

AVIATION.

VFR cond continue today, with the only exception being TJMZ/TJBQ where enhanced cloudiness and VCSH are possible this afternoon. Overall winds will be out of the SE at 5-15 kts, with sea breeze variations modifying the direction for TJSJ/TJMZ/TJBQ.

MARINE.

Calm seas will continue into Friday, after which a northerly swell will promote hazardous seas through the weekend and into next week. Small Craft Advisory conditions are expected to begin late Friday for the Atlantic waters, and for most other areas on Saturday. The peak in wave heights will occur Sunday into Monday, with seas of 7-9 feet. Calmer seas will prevail by the middle of the week.

PREV DISCUSSION. /issued 436 AM AST Thu Apr 2 2020/

SYNOPSIS . Warm temperatures are expected to continue today under a southeasterly wind flow across the islands. An increase in moisture at the lower levels today should result in afternoon convection mainly across northwestern Puerto Rico. A frontal boundary will approach the area during the weekend, bringing an increase in showers.

SHORT TERM . Today through Saturday . Moisture increases only at the lowest levels of the atmosphere today as southeast to south flow from 1000-700 mb continues across the forecast area. This will give rise to a few areas where showers can develop over Puerto Rico, namely from the northwest along the northern half of the island to almost Catano. High pressure in the central Atlantic at the surface will drift erratically, but inexorably to the east which will allow winds to become more east southeast by the end of the period. A cold front moving across Cuba at the moment will move across Hispaniola Friday and Friday evening and into Puerto Rico Saturday. But before it enters the forecast area, moisture already moving over the area will become enhanced at the 850 mb level and form a pre- frontal band ahead of the front which will be a factor in the rainfall Friday and Saturday. The best showers should move into the northern waters of the forecast area Saturday evening and stall. Providing moisture into the long term period. This moisture, being shallow, will provide only spotty areas of significant rainfall.

LONG TERM . Sunday through Friday . A long-wave mid to upper level trough will continue to be the dominant weather feature across the western Atlantic early in the forecast period, while it will begin to move away, toward the central Atlantic by mid-week. At the surface on Sunday and Monday, a frontal boundary near the area and a surface high pressure over the eastern Atlantic will result in an area of low level convergence that will drag moisture into the islands. Precipitable water values are expected to range between 1.3 to 1.5 inches these days. Additionally, at the upper levels, a piece of the jet stream will be located north of the islands, hence increasing somewhat instability aloft. That said, conditions appear to be more conducive for an increase in showers across the islands. Under a light wind flow across the islands, this activity could be slow-moving, and might result in urban and small stream flooding across the area.

By the latter part of the long-term forecast period, as the long- wave trough moves toward the Central Atlantic, conditions are expected to become less favorable for any significant rainfall activity to occur. However, at the lower levels, moisture and low level convergence remains. Therefore, groups of showers may affect the area early in the morning hours across the coastal areas, while in the afternoon, supported by diurnal effects, additional showers may develop as well.

AVIATION . VFR conditions are expected to prevail across all terminals during the next 24 hours. Sct SHRA to dvlp in nwrn and interior PR aft 02/16Z with mtn top obscurations. Winds primarily out of the SE across the region at 5-15 knots with sea breeze modifications. Max winds WSW-W 60-75 kt btwn FL350-470 strongest at FL400.

MARINE . Tranquil marine conditions are expected to prevail through today, but becoming choppy on Friday and hazardous for the weekend. This is due to a northerly swell invading the Atlantic and local waters. Seas below 4 feet are expected for today with winds out of the southeast up to 10 knots. For the beaches, the risk of rip currents is moderate for the northern coasts of Puerto Rico, all of Culebra, the northwestern beaches of Saint Thomas and the eastern tip of Saint Croix. The risk will be low elsewhere today and also tonight and Friday in the U.S. Virgin Islands.

PRELIMINARY POINT TEMPS/POPS. SJU 90 73 90 74 / 20 20 30 30 STT 85 74 84 74 / 20 30 30 30

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

SHORT TERM . mb PUBLIC DESK . DS


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
AROP4 - 9757809 - Arecibo, PR 16 mi277 min N 7 G 8.9
PTRP4 16 mi260 min S 11 G 17 82°F
41115 - Rincon, Puerto Rico (181) 17 mi265 min 81°F2 ft
MGZP4 - 9759394 - Mayaguez, PR 21 mi283 min 81°F 82°F1016.5 hPa
MGIP4 - 9759110 - Magueyes Islands, PR 37 mi277 min SSE 8.9 G 12 82°F 81°F1016.1 hPa
SJNP4 - 9755371 - San Juan, PR 47 mi277 min ESE 1.9 G 7 83°F 81°F1015.8 hPa
41053 - San Juan, PR 48 mi325 min NNE 5.8 G 7.8 79°F 80°F2 ft1015 hPa (+1.3)

Wind History for Arecibo, PR
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Aquadilla, Rafael Hernandez Airport, PR6 mi35 minSW 11 G 1510.00 miPartly Cloudy86°F0°F%1012.9 hPa

Link to 5 minute data for TJBQ

Wind History from JBQ (wind in knots)
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Last 24hrE14
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E13E9E5SE3SE3------------------S3SE3CalmNW3NE4N6W9
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1 day agoNE12E8E6E7--E4------------------CalmCalmCalmS3SW3NW9NW8W8W9
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2 days agoE17
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E14E14E15E13------------------SE5E3E7E9E9E11NE12NE9E9

Tide / Current Tables for Aguadilla, Crashboat Beach, 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 Mayaguez, Puerto Rico
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Mayaguez
Click for Map
Thu -- 01:56 AM AST     Moonset
Thu -- 03:28 AM AST     1.45 feet High Tide
Thu -- 06:21 AM AST     Sunrise
Thu -- 10:17 AM AST     0.45 feet Low Tide
Thu -- 01:19 PM AST     Moonrise
Thu -- 02:41 PM AST     0.79 feet High Tide
Thu -- 06:42 PM AST     Sunset
Thu -- 09:12 PM AST     -0.11 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.71.11.31.41.41.31.10.90.70.50.50.50.60.70.80.80.70.60.40.1-0-0.1-0.10.1

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 (15,3,4,5)
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Ground Weather Radar Station Puerto Rico,Virgin Islands
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weather_mapweather_map weather_map

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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.