Wednesday, June20, 2018

Marine Weather and Tides
Las Croabas, PR

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 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.

Sunrise 5:46AMSunset 7:02PM Wednesday June 20, 2018 3:01 PM AST (19:01 UTC) Moonrise 12:39PMMoonset 12:25AM Illumination 49% Phase: First Quarter Moon; Moon at 7 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
    EDIT      (on/off)   Help
AMZ725 Coastal Waters Of Southern Usvi Vieques And Eastern Puerto Rico Out 10 Nm- 1008 Am Ast Wed Jun 20 2018
Rest of today..Southeast winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated Thunderstorms late in the morning. Scattered showers through the day.
Tonight..Southeast winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers.
Thursday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers.
Thursday 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.
Friday..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated Thunderstorms. Scattered showers.
Saturday..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Numerous showers and isolated Thunderstorms.
Sunday..East winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 7 seconds. Isolated Thunderstorms, then isolated showers.
AMZ700 1008 Am Ast Wed Jun 20 2018
Synopsis for puerto rico and the uS. Virgin islands waters... A ridge extends from a surface high pressure located across the northeastern atlantic to just north of the local area and will promote moderate southeasterly winds over the next several days. The trailing moisture of a tropical wave will brush the area and bring periods of showers and Thunderstorms through late this afternoon. NExt tropical wave will approach the regional waters by Friday morning.

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

Area Discussion for - San Juan, PR
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxca62 tjsj 201522
area forecast discussion
national weather service san juan pr
1122 am ast Wed jun 20 2018

Some changes were introduce to the forecast to package to adjust
the expected weather. The strongest activity is forecast over the
northwest quadrant and the southeastern quadrant of puerto rico.

However the potential for showers and thunderstorms still in
effect for most of the local islands. A dry air mass will
encompass the islands later tonight. As a result hazy skies with
little or no shower activity is expected overnight and early
Thursday morning.

Shra tsra are expected to affect tjsj tjbq tjmz tjps tist tncm
btwn 20 16-23z. Brief MVFR or even ifr is possible at tjbq and
across tisx tist tjsj through this evening. Shra and tsra will
dissipate later tonight as a dry air mass reach the islands.

Winds are expected to continue from the ese-se at 10 to 15 knots
with sea breeze variations. Higher gusts are expected in near
shra tsra.

A tropical wave south of dominican republic will continue to
bring showers and thunderstorms across the region through late
this evening. Mariners can expect seas at 3 to 5 feet with an
east-southeast wind flow between 10 and 15 knots. However,
locally higher seas and winds near showers and thunderstorms are
expected through this period.

Prev discussion issued 518 am ast Wed jun 20 2018
synopsis... A tropical wave will move out of the area today with
copious moisture and good instability behind it. Drier air will
move in from the east overnight. Another tropical wave will move
through on Friday. Moisture will linger through at least Sunday
morning with scattered showers. More typical weather will follow
next week in east southeast trade wind flow of modest moisture.

Short term... Today through Friday...

lingering moisture from a tropical wave that moved to the south of
puerto rico will cause showers and isolated thunderstorms across
most of the area today. A digging tutt low will continue its
southern progression near puerto rico today, and produce upper level
divergence aloft. As a result of the lingering moisture and the
upper level forcing due to the digging tutt low, and a small jet
streak, isolated thunderstorms are expected across most of puerto
rico today. The GFS sounding for san juan depicts how unstable
the current atmosphere is with southerly wind flow, convective temperature
of 88 degrees, and surface based CAPE around 2800, and LI index
of minus 9. Recent analysis of the gdi shows values ranging from
35 to 40 which means there is potential for scattered
thunderstorms with some having the capability of producing heavy
rain and frequent lightning similar yesterday. Therefore, any
additional rainfall could cause urban and small stream flooding
and ponding of water on roadways.

Later tonight the moist tropical air gets eroded away by dry saharan
air filtering in from the east, therefore precipitable water values
are expected to decrease until Friday afternoon, but scattered
showers and isolated thunderstorms are possible across the
northwestern puerto rico.

Friday, will be a transition day from dry saharan air to a moist
tropical air mass as another tropical wave moves through the
caribbean waters Friday morning. Showers and isolated thunderstorms
are expected across the outer caribbean waters and the eastern
islands of puerto before arriving over puerto rico during the

Long term... Saturday through Wednesday
moisture from the tropical wave that entered the area Friday will
continue through Sunday. Then drier air will move in Monday and
Tuesday. Moisture will gradually increase Tuesday through

High pressure at the surface will shift to the west central
atlantic over the weekend. This will cause winds at the surface to
become more easterly and will allow some moderation of the warm
highs that we have had on the north coast of puerto rico.

This trend will continue into the early part of the week.

At upper levels, a tutt low will be just north of puerto rico
beginning Saturday. This indicates thunderstorms with frequent
lightning will be possible. This low will move northwest and will
be replaced by a weak ridge that moves into place between another
stronger low well northeast of the area. This will also allow
showers and thunderstorms to diminish during the early part of
next week.

Aviation... Vrf MVFR conds will continue for the remainder
of the TAF period. Shra vcts are expected to affect terminals tist
and tisx during the morning before moving across terminals tjsj,
tjps,tjmz and tjbq by 20 14z. Shra tsra will persist until 21 00z
with MVFR vsbys occurring in +shra vcts. Shra tsra will diminish
at all terminals by 21 03z. Sfc winds out of the east south east
at 15 to 20 kts with higher gusts possible within shra tsra.

Marine... Seas are relatively low--mostly 5 feet or less until the
weekend. Then seas in the caribbean will have areas of 6 feet.

Small craft advisories are not expected in the next 7 days.

Preliminary point temps pops
Sju 90 77 91 78 40 40 10 20
stt 87 79 89 79 40 20 10 30

Sju watches warnings advisories
Pr... None.

Vi... None.

Am... None.

Update... Cam
aviation... Cam

Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
41056 8 mi62 min ESE 3.9 G 5.8 80°F 83°F2 ft1016.3 hPa (+0.0)
CLBP4 - 9752235 - Culebra, PR 14 mi44 min 81°F 84°F1016.8 hPa
YABP4 - 9754228 - Yabucoa Harbor, PR 24 mi44 min 87°F
41053 - San Juan, PR 30 mi62 min ESE 9.7 G 14 87°F 82°F3 ft1015.3 hPa (-0.9)
SJNP4 - 9755371 - San Juan, PR 30 mi44 min 87°F 83°F1016 hPa
JOXP4 - Jobos Bay Reserve, Puerto Rico 44 mi77 min E 5.1 87°F 1017 hPa75°F
LAMV3 45 mi44 min 82°F 83°F

Wind History for Fajardo, PR
(wind in knots)    EDIT      (on/off)   Help
1 day
2 days

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Juan, Luis Munoz Marin International Airport, PR24 mi66 minVar 510.00 miMostly Cloudy90°F70°F52%1016 hPa

Wind History from JSJ (wind in knots)
Last 24hrE9E8E11SE8S10
1 day agoE19NE14E12E13E10E8E6E6SE4SE3CalmCalmCalmCalmCalmCalmCalmCalmSE6E9NE11E11E14
2 days ago4SE7S4S7S4S3S3CalmE4CalmE5CalmCalmS3CalmCalmCalm--E6W3E13NE15E16E18

Tide / Current Tables for Playa de Fajardo, Puerto Rico
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Playa de Fajardo
Click for Map
Wed -- 12:25 AM AST     Moonset
Wed -- 02:17 AM AST     1.50 feet High Tide
Wed -- 05:47 AM AST     Sunrise
Wed -- 06:52 AM AST     First Quarter
Wed -- 08:51 AM AST     0.08 feet Low Tide
Wed -- 12:39 PM AST     Moonrise
Wed -- 03:04 PM AST     1.18 feet High Tide
Wed -- 07:01 PM AST     Sunset
Wed -- 08:52 PM AST     0.27 feet Low Tide
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
   EDIT      (on/off)   Help   One Week of Data
Vieques Passage
Click for Map
Wed -- 12:25 AM AST     Moonset
Wed -- 01:26 AM AST     0.00 knots Slack
Wed -- 04:19 AM AST     0.56 knots Max Flood
Wed -- 05:47 AM AST     Sunrise
Wed -- 06:52 AM AST     First Quarter
Wed -- 07:06 AM AST     -0.00 knots Slack
Wed -- 10:32 AM AST     -0.80 knots Max Ebb
Wed -- 12:39 PM AST     Moonrise
Wed -- 01:50 PM AST     0.00 knots Slack
Wed -- 05:05 PM AST     0.78 knots Max Flood
Wed -- 07:00 PM AST     Sunset
Wed -- 08:25 PM AST     -0.00 knots Slack
Wed -- 11:28 PM AST     -0.65 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Weather Map and Satellite Images
       (on/off)   HelpWeather Map
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.
target = "new">Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (15,3,4,5)
      (on/off)   Help

Ground Weather Radar Station Puerto Rico,Virgin Islands
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.