Sunday, July23, 2017 L-36.com


Marine Weather and Tides
Las Croabas, PR

Version 3.4
What's New / NOTES
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.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 5:56AMSunset 7:01PM Sunday July 23, 2017 2:56 AM AST (06:56 UTC) Moonrise 6:03AMMoonset 7:21PM Illumination 0% Phase: New Moon; Moon at 29 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- 945 Pm Ast Sat Jul 22 2017
Rest of tonight..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 8 seconds. Numerous showers and isolated Thunderstorms.
Sunday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Scattered 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.
Monday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated showers.
Monday night..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Scattered showers.
Tuesday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Scattered showers.
Wednesday..Southeast winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 8 seconds. Scattered showers.
Thursday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Scattered showers and isolated Thunderstorms.
AMZ700 945 Pm Ast Sat Jul 22 2017
Synopsis for puerto rico and the uS. Virgin islands waters... A broad surface high pressure across the central atlantic will sustain moderate to locally fresh easterly trade winds through at least Tuesday night. Showers and isolated Thunderstorms are forecast to move through the forecast area through the rest of the overnight hours. Seas will subside below 5 feet on Tuesday and Wednesday.

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 222311 aaa
afdsju
area forecast discussion... Updated
national weather service san juan pr
711 pm ast Sat jul 22 2017

Update Have amended grids and zones to reflect a better chance
of rain for saint thomas and saint john, and later eastern puerto
rico. Thunderstorms are moving toward the northern u.S. Virgin
islands and, although the tops have come down from over 50 kft,
they are still expected to bear significant rains.

Aviation Shra and psbl tsra accompanying the tropical wave
will begin to impact tist before 23 00z with MVFR conds and mtn
obscurations. Winds at the sfc will continue from the east at
about 10-15kt with higher gusts in shra tsra, overnight weather
will likely cause vcsh across the local terminals except for tjmz.

Limited MVFR and widespread mtn obscurations will likely continue
through at least 23 16z for pr while diminishing aft 23 12z for
tncm tkpk. Winds alf easterly 10-20 kt up thru fl320 becmg
easterly at all levels by 24 00z. Winds strongest blo fl100.

Marine No changes to previous discussion. Thunderstorms may
create locally higher winds and seas.

Prev discussion issued 308 pm ast Sat jul 22 2017
synopsis... A tropical wave with good moisture will move through
the area early tonight followed by drier air Sunday and Monday.

Moisture wrapping around a high pressure will reach the area on
Tuesday. A second tropical wave will follow on Thursday and better
moisture will follow it. Moisture tapers off slightly over the
following weekend.

Short term... Tonight through Tuesday
winds shifted shortly after noon from a prevailing northeast flow
to an east southeast flow suggesting that the tropical wave or a
weaker trough may have passed through the area. The mimic product
shows the best moisture hanging back at about 61.5 degrees west as
of 22 13z and present calculations suggest that it should cross
saint thomas at 23 05z and san juan at about 23 09z--or earlier,
since there are indications that it is accelerating somewhat.

Currently tops have exceeded 50kft in western puerto rico, but
convection has been weaker in eastern puerto rico. Better rainfall
is expected overnight but it will likely be confined to the
southeast third of puerto rico with scattered showers around the
u.S. Virgin islands.

With east to east southeast flow and a definite drop in
columnar moisture the first half of Sunday, maximum temperatures
should again broach the 90s on most of the north coast. Limited
moisture to counteract this heating on the south coast may also
allow high temperatures to resist the sea breezes and be
predominantly in the lower 90s. Monday will continue this trend.

Early Tuesday morning moisture arrives from the northeast that had
traveled around a high pressure north of the area and by Tuesday
afternoon precipitable water will be close to 2 inches again. This
will begin a wetter trend.

Long term... Wednesday through Saturday
areas of moisture with a few dry slots move through the area
through Saturday on mostly easterly low level flow that will
sustain our seasonal summer pattern of showers and thunderstorms
each day. First around the u.S. Virgin islands in the early
mornings and into eastern puerto rico, and then in the western and
interior portions of the puerto rico during the afternoons. No
strong features are currently seen in the models through the end
of july, but seasonal showers and thunderstorms often do produce
urban and small stream flooding in the afternoons.

Aviation... Shra tsra expected to continue over pr this afternoon
until around 22 22z. This will cause vcsh or vcts near the
terminals in pr. Vcsh is expected for the remaining local
terminals as shra move in with the tropical wave that is bringing
plenty of moisture. Winds will continue from the east at about
10-15kt with higher gusts this afternoon, then decrease overnight
to around 10kt. Overnight weather will likely cause vcsh across
the local terminals except for tjmz limited MVFR and mtn
obscurations will likely continue through at least 23 16z. Winds
alf easterly 10-20 kt up thru fl320 becmg easterly at all levels
by 24 00z. Winds strongest blo fl100.

Marine... Seasonally tranquil seas of 5 feet or less are expected
in most of the local waters through the end of july. Small craft
advisories are not expected to be issued this month under the
current forecast. But winds up to 20 knots are possible in exposed
waters and small craft will need to exercise caution.

Preliminary point temps pops
Sju 79 90 81 90 60 50 20 20
stt 80 89 81 90 70 60 20 20

Sju watches warnings advisories
Pr... None.

Vi... None.

Am... None.

Short term... Ds
long term... .Ws


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FRDP4 - 9753216 - Fajardo, PR 3 mi44 min E 11 G 12 83°F 78°F
41056 8 mi56 min E 14 G 18 84°F 2 ft1015.8 hPa (-1.4)
CLBP4 - 9752235 - Culebra, PR 14 mi44 min 83°F 85°F1015.8 hPa
VQSP4 - 9752619 - Isabel Segunda, Vieques, PR 15 mi44 min ESE 2.9 G 5.1 81°F
ESPP4 - 9752695 - Esperanza, PR 18 mi44 min ESE 8.9 G 14 83°F 85°F1015.7 hPa
YABP4 - 9754228 - Yabucoa Harbor, PR 24 mi44 min W 1 G 1.9 81°F
SJNP4 - 9755371 - San Juan, PR 30 mi44 min SSE 1.9 G 1.9 81°F 85°F1016.1 hPa
41053 - San Juan, PR 30 mi56 min ESE 3.9 G 7.8 82°F 83°F3 ft1015.5 hPa (-1.0)
CHAV3 - 9751639 - Charlotte Amalie, VI 34 mi44 min ESE 1.9 G 8 83°F 85°F
41052 - South of St. John, Virgin Islands 43 mi56 min E 14 G 16 85°F 84°F3 ft1014.4 hPa (-1.6)
JOXP4 - Jobos Bay Reserve, Puerto Rico 44 mi71 min NNE 1.9 80°F 1016 hPa75°F
LAMV3 45 mi44 min 83°F 85°F

Wind History for Fajardo, PR
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Juan, Luis Munoz Marin International Airport, PR24 mi2 hrsN 010.00 miA Few Clouds82°F78°F89%1016.6 hPa

Wind History from JSJ (wind in knots)
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Last 24hrE4E4CalmCalmE6E11NE8NE12NE12E11NE12NE13E16E11E10E10E9E8E8SE4CalmSE3Calm5
1 day agoE10E13E12E12E12E13E19
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2 days agoNE10NE10E9E7NE9NE12E14E8NE14
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Tide / Current Tables for Playa de Fajardo, Puerto Rico
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Playa de Fajardo
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Sun -- 03:02 AM AST     0.38 feet Low Tide
Sun -- 05:47 AM AST     New Moon
Sun -- 05:57 AM AST     Sunrise
Sun -- 06:04 AM AST     Moonrise
Sun -- 08:02 AM AST     1.08 feet High Tide
Sun -- 02:13 PM AST     -0.31 feet Low Tide
Sun -- 07:00 PM AST     Sunset
Sun -- 07:21 PM AST     Moonset
Sun -- 09:25 PM AST     1.94 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.10.70.50.40.40.60.811.110.80.50.1-0.2-0.3-0.3-00.40.91.41.71.91.91.7

Tide / Current Tables for Vieques Passage, Puerto Rico Current
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Vieques Passage
Click for Map
Sun -- 01:21 AM AST     -0.00 knots Slack
Sun -- 04:50 AM AST     -1.05 knots Max Ebb
Sun -- 05:47 AM AST     New Moon
Sun -- 05:57 AM AST     Sunrise
Sun -- 06:04 AM AST     Moonrise
Sun -- 08:32 AM AST     0.00 knots Slack
Sun -- 11:12 AM AST     0.59 knots Max Flood
Sun -- 02:03 PM AST     -0.00 knots Slack
Sun -- 04:53 PM AST     -0.58 knots Max Ebb
Sun -- 06:59 PM AST     Sunset
Sun -- 07:21 PM AST     Moonset
Sun -- 07:34 PM AST     0.00 knots Slack
Sun -- 11:01 PM AST     0.90 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.60.2-0.3-0.7-1-1-0.9-0.6-0.20.20.50.60.50.30-0.3-0.5-0.6-0.5-0.20.20.50.80.9

Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
carb_satellite

GOES Local Image of Puerto Rico    EDIT
Geos

Wind Forecast for (2,6,7,8)
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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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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 numerious 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.