Thursday, April26, 2018

Marine Weather and Tides
Las Croabas, PR

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.

Sunrise 5:56AMSunset 6:43PM Thursday April 26, 2018 1:58 AM AST (05:58 UTC) Moonrise 3:53PMMoonset 3:42AM Illumination 83% Phase: Waxing Gibbous; Moon at 11 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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AMZ725 Coastal Waters Of Southern Usvi Vieques And Eastern Puerto Rico Out 10 Nm- 908 Pm Ast Wed Apr 25 2018
Rest of tonight..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Scattered showers.
Thursday..Southeast winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. Northeast swell around 4 feet in the afternoon. Scattered showers.
Thursday night..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. Northeast swell around 4 feet in the evening. Isolated showers.
Friday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. Isolated showers.
Friday 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.
Saturday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. East swell around 4 feet. Isolated showers.
Sunday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. Scattered showers.
Monday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Scattered showers.
AMZ700 908 Pm Ast Wed Apr 25 2018
Synopsis for puerto rico and the uS. Virgin islands waters... A moderate east southeast wind flow will prevail through the weekend then become easterly early next week. Showers will increase across the local waterways late tonight and Thursday. Conditions on Friday will improve due to a mid and upper level ridge combined with drier air.

7 Day Forecast for Marine Location Near Las Croabas, PR
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location: 18.34, -65.57     debug

Area Discussion for - San Juan, PR
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Fxca62 tjsj 260143 aaa
area forecast discussion... Updated
national weather service san juan pr
943 pm ast Wed apr 25 2018

Update The area of moisture that was over the greater antilles
islands yesterday continues to move slowly west toward the area. Mid
level moisture has now arrived at saint thomas and their last
observation included a ceiling of 6500 feet. Infrared satellite
imagery shows a wide band of mostly lower to mid level moisture
with the strongest activity located in a line that extends from
the arc of the lesser antilles toward the northwest. Models show
much of this moisture arriving in eastern puerto rico by 26 06z
although this may be too fast. Expect shower activity to increase
gradually overnight and measurable rain to be likely in eastern
puerto rico between 26 08-15z.

The complete sounding from 26 00z showed 1.17 inches of
precipitable water since we are still in the trailing edge of a
dry slot in san juan. Showers that were active over western puerto
rico this afternoon have completely dissipated but the showers in
the moisture approaching the usvi are visible and generally light
and moving toward 300 degrees at about 10 knots.

Rain chances (pop) grids have been modified to conform with latest
model data and will be reflected in the recently issued zone and
digital products.

Southeast flow will continue the warm conditions along the north
coast of puerto rico, but additional moisture should keep
temperatures contained to the upper 80s or around 90 just inland
in the greater san juan metropolitan area.

Otherwise, no change to the general discussion below.

Aviation Sct isold shra are sprdg west from tncm tkpk.

Nevertheless generallyVFR conds persist there with a sct lyr at
fl018-020 and a bkn lyr at fl045-048. Conds imprv slowly thru
26 15z and then few clds are expected aft 26 16z. MVFR conds are
not expected too last long if they occur in the usvi with cigs
when present at arnd fl050. Shra will sprd across pr begg arnd
26 08z with mtn obscurations. MVFR is not expected at
tjsj tjps , but may occur aft 26 16z at tjbq tjmz. Sfc winds E 5-10
kt til 26 14z then bcmg 6-16kt with sea breeze influences. Max
winds W 50-65 kt btwn fl380-500 at 26 18z.

Marine Small craft advisory conditions are not expected this
month. Swell will remain ne-e, with seas in exposed waters from 3
to 6 feet.

Prev discussion issued 417 pm ast Wed apr 25 2018

an increase in low level moisture is expected tonight and
Thursday, with increasing rain chances tomorrow. A mid to upper
level ridge will build over the area late Thursday and prevail
across the region through early next week with fair weather and an
occasional shower.

Short term... Tonight through Friday...

mostly sunny skies prevailed over the u.S. Virgin islands and
puerto rico today with easterly winds ranging from 5 to 15 mph.

Some showers were observed over the atlantic waters but other than
those isolated showers today has been tranquil. A weakening
surface trough near the lesser antilles has pulled low level
moisture into the caribbean and north atlantic waters today with
the bulk of the moisture expected to reach the u.S. Virgin
islands and puerto rico tonight and Thursday morning. As a result
an increase in showers with the possibility for isolated
thunderstorms is expected on Thursday. Early Friday a
strengthening upper and mid level ridge will build across the area
and prevail through the weekend with brisk easterly winds of 15
to 20 mph. Drier air and strong trade winds will limit shower
development across the area on Friday through the weekend.

Long term...

a mid to upper level ridge will hold across the forecast area through
the weekend. This feature is expected to quickly erode early the next
workweek as a broad upper level trough establishes across the western
atlantic and into the eastern caribbean. The aforementioned trough
will promote moisture advection across the eastern caribbean Wednesday
onwards. If the long term forecast holds, expect seasonably conditions
Saturday through Tuesday with locally induced afternoon showers
and a few isolated thunderstorms across the western interior and
west areas of puerto rico each day. The chance for showers and
thunderstorms are expected to increase by midweek under deep
tropical moisture and plenty of upper level dynamics associated
with the upper level trough.


mainlyVFR conditions are expected to prevail early in
the forecast period. Shra expected to increase from the east across
the usvi terminals by 26 06z then by 26 12z across the eastern pr
terminals. This will be followed by tsra developing after 16z across
the interior and western pr. Tempo MVFR to brief ifr possible with
afternoon activity at tjmz tjbq. Sct-bkn CIGS btw fl030-fl060 and
mtns obscd expected across the pr terminals on Thursday. Winds will
continue from the ese blo fl100 at 8-18 kt with sea breeze
variations at the northern and western terminals aft 26 14z.


seas are expected to range from 3 to 4 feet across the coastal
waters while the offshore waters and passages will be near 3 to 5
feet. East southeast winds 10 to 20 kts will prevail over the next
several days. There is a moderate risk of rip currents across the
northern beaches of puerto rico today.

Preliminary point temps pops
Sju 76 89 76 89 50 40 20 20
stt 76 87 76 87 40 30 20 20

Sju watches warnings advisories
Pr... None.

Vi... None.

Am... None.

Short term... Tw
long term... .Ws

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
41056 8 mi59 min E 12 G 14 79°F 3 ft1015 hPa (-1.1)
CLBP4 - 9752235 - Culebra, PR 14 mi41 min 82°F1014.7 hPa
YABP4 - 9754228 - Yabucoa Harbor, PR 24 mi41 min 82°F
SJNP4 - 9755371 - San Juan, PR 30 mi47 min 78°F 80°F1015.2 hPa
41052 - South of St. John, Virgin Islands 43 mi59 min ESE 14 G 16 79°F 1013.8 hPa (-1.4)
JOXP4 - Jobos Bay Reserve, Puerto Rico 44 mi74 min Calm 75°F 1016 hPa70°F
LAMV3 45 mi41 min 78°F 81°F

Wind History for Fajardo, PR
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1 day
2 days

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Juan, Luis Munoz Marin International Airport, PR24 mi63 minESE 310.00 miA Few Clouds78°F73°F87%1015.2 hPa

Wind History from JSJ (wind in knots)
Last 24hrSE4E3S3CalmCalmE3E6E11E10NE10E14
1 day agoCalmE3CalmSE5E8E10E13E14E17E16
2 days agoCalmCalmCalmCalmCalmCalmCalmE6E9NE13E17NE17E13E15E7E16E9E8E12E8E5E7SE3Calm

Tide / Current Tables for Playa de Fajardo, Puerto Rico
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Playa de Fajardo
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Thu -- 03:42 AM AST     Moonset
Thu -- 05:58 AM AST     Sunrise
Thu -- 05:59 AM AST     1.36 feet High Tide
Thu -- 12:14 PM AST     0.11 feet Low Tide
Thu -- 03:52 PM AST     Moonrise
Thu -- 06:29 PM AST     1.30 feet High Tide
Thu -- 06:42 PM AST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Tide / Current Tables for Vieques Passage, Puerto Rico Current
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Vieques Passage
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Thu -- 02:01 AM AST     -0.66 knots Max Ebb
Thu -- 03:42 AM AST     Moonset
Thu -- 05:14 AM AST     0.00 knots Slack
Thu -- 05:58 AM AST     Sunrise
Thu -- 08:09 AM AST     0.57 knots Max Flood
Thu -- 11:02 AM AST     -0.00 knots Slack
Thu -- 02:17 PM AST     -0.69 knots Max Ebb
Thu -- 03:52 PM AST     Moonrise
Thu -- 05:26 PM AST     0.00 knots Slack
Thu -- 06:42 PM AST     Sunset
Thu -- 08:37 PM AST     0.72 knots Max Flood
Thu -- 11:47 PM AST     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Weather Map and Satellite Images
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GOES 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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (1,6,7,8)
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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 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 numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at 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.