Friday, October20, 2017 L-36.com


Marine Weather and Tides
Vieques, 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 6:17AMSunset 5:57PM Friday October 20, 2017 12:22 PM AST (16:22 UTC) Moonrise 6:54AMMoonset 6:49PM Illumination 0% Phase: New Moon; Moon at 0 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- 957 Am Ast Fri Oct 20 2017
Rest of today..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 8 seconds. Isolated showers.
Tonight..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 8 seconds. Isolated showers.
Saturday..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 day.
Saturday night..East winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 7 seconds. Isolated showers.
Sunday..East winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 7 seconds. Isolated showers.
Monday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Isolated showers.
Tuesday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Isolated showers.
AMZ700 957 Am Ast Fri Oct 20 2017
Synopsis for puerto rico and the uS. Virgin islands waters... A trade wind surge will continue to produce choppy and hazardous seas particularly across the offshore caribbean waters and local passages through at least Sunday. Saharan dust over the local area will continue to cause reduced visibility due to haze today. A moderate to fresh easterly wind flow will prevail Sunday and into early next week.

7 Day Forecast for Marine Location Near Vieques, PR
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location: 18.15, -65.43     debug


Area Discussion for - San Juan, PR
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Fxca62 tjsj 201523
afdsju
area forecast discussion
national weather service san juan pr
1123 am ast Fri oct 20 2017

Update The 12z tjsj sounding came in very dry with pwat values
of near 1 inch, which is more than 2 standard deviations below
normal according to sounding climatology for october. This dry air
mass will continue to support mostly fair weather conditions
across the region throughout the day today into tonight. There is
a slight chance that a few locally and diurnally induced showers
may still develop across western pr this afternoon, however, given
how dry the atmosphere is any showers that do develop will be
short-lived with no significant accumulations expected. It will
also continue to be hazy as saharan dust particulates remain over
the area.

Aviation MostlyVFR conditions will continue to prevail across
all terminals. A brief reduction to MVFR conditions due to hazy
conditions still possible with improvement expected this afternoon
and tonight. Some brief MVFR conditions may also occur in any
showers that manage to develop in the vicinity of tjbq and tjmz
this afternoon. E-se winds of 10-15kt with gusts up to 20kt
expected through this afternoon. Winds diminishing below 10 kts
after 21 00z.

Marine No changes to previous discussion. Small craft
advisories continue in effect across the nearshore and offshore
caribbean waters and mona passage with seas as high as 7 feet
possible. Up to 5-6 feet expected across the rest of the local
waters. High risk of rip currents continue across southwest and
southeast coast of pr through this afternoon with low to moderate
elsewhere.

Prev discussion issued 458 am ast Fri oct 20 2017
synopsis... The dry airmass will continue through Monday, but
afternoon scattered showers are expected in western puerto rico
by Sunday. Moisture will continue to increase during the week next
week and the chances for showers will follow.

Short term... Today through Sunday...

the lower levels of the atmosphere continue unseasonably dry
while ridging aloft also generates subsidence today and Saturday.

Nevertheless some patches of modest moisture will travel west
across the local atlantic waters bringing a slight increase in
isolated showers and cloud cover Saturday and a little more on
Sunday, such that even the precipitable water spikes to 1.5
inches Sunday morning. It returns to less than one inch according
to the GFS Sunday afternoon. Also on Sunday an upper level low
will begin to drop southeast toward the leeward islands,
increasing northwest flow at upper levels over the local area.

Generally however upper levels contribute little or nothing to
support convection and mid levels remain very dry through Sunday
evening. This is expected to suppress all deep convection in the
area.

Long term... Monday through Thursday
the upper level low that was sinking southeast toward the leeward
islands will pull a 60 to 70 knot jet over the area on its western
side by Tuesday, but divergence convergence remains mainly
neutral at upper levels even as moisture slowly increases through
the week. This will bring a gradual increase in showers Wednesday
through Saturday and eventually late in the week, thunderstorms
will also return. Flow will oscillate between east northeast and
east southeast as weak troughs pass through from the east Tuesday
and Friday night of the upcoming week and generally moisture will
be best following the waves when convection will favor the
northwest quarter of puerto rico. Strong features or tropical
cyclone development is not indicated during the next 7 to 10 days.

Aviation... Current visibilities range from almost 4 miles to
around 8 miles as a strong dust episode continues. Condtions will
gradually improve during the next 24 hrs. But areas of MVFR due
to dust will continue. Shra will be few--if any. Sfc winds ese 10
to 20 kt with higher gusts and sea breeze influences. Winds just
above the sfc to fl100 ese 20 to 30 kt bcmg just 20 kt 21 00-12z.

This will also be the level of maximum winds through 21 06z.

Marine... Winds and seas will slowly diminish during the next
several days but a second weak wave will increase seas again on
Sunday--mainly in the caribbean. Small craft advisories will
continue there till Monday.

Preliminary point temps pops
Sju 89 79 89 80 0 10 20 10
stt 88 80 88 80 0 20 20 10

Sju watches warnings advisories
Pr... High rip current risk until 6 pm ast this evening for central
interior-northeast-southeast-southwest.

Small craft advisory until 6 pm ast this evening for southeast.

Vi... None.

Am... High rip current risk until 6 pm ast this evening for coastal
waters of southwestern puerto rico out 10 nm.

Small craft advisory until 6 pm ast this evening for coastal
waters of southern puerto rico out 10 nm.

Small craft advisory until 6 pm ast Sunday for caribbean waters
of puerto rico from 10 nm to 17n-mona passage southward to
17n.

Short term... Gl
long term... .Ja


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
41056 8 mi143 min E 14 G 18 83°F 3 ft1016.7 hPa (+1.3)
CLBP4 - 9752235 - Culebra, PR 12 mi125 min 86°F 84°F1017 hPa
YABP4 - 9754228 - Yabucoa Harbor, PR 22 mi125 min 88°F
LAMV3 39 mi125 min 84°F 84°F
SJNP4 - 9755371 - San Juan, PR 42 mi131 min 83°F1016.7 hPa
41053 - San Juan, PR 42 mi143 min E 16 G 19 83°F 83°F4 ft1015.8 hPa (+0.9)
JOXP4 - Jobos Bay Reserve, Puerto Rico 44 mi158 min E 9.9 86°F 1017 hPa73°F

Wind History for Isabel Segunda, Vieques Island, PR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Juan, Luis Munoz Marin International Airport, PR36 mi87 minE 169.00 miA Few Clouds86°F75°F72%1016.2 hPa

Wind History from JSJ (wind in knots)
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Last 24hrE17
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E11E11E11E8E6E9SE6E6E6E5E5E6E10E9E8E12E11
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1 day agoE11E14E13E13
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2 days agoE12E14E13E13SE4E8E6E7E6E6E7SE4SE5CalmCalmE6CalmSE4SE4SE3E10E14E14
G19
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G19

Tide / Current Tables for Punta Mulas, Isla de Vieques, Puerto Rico
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Punta Mulas
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Fri -- 02:29 AM AST     0.20 feet Low Tide
Fri -- 06:16 AM AST     Sunrise
Fri -- 06:53 AM AST     Moonrise
Fri -- 09:14 AM AST     1.32 feet High Tide
Fri -- 03:37 PM AST     0.37 feet Low Tide
Fri -- 05:55 PM AST     Sunset
Fri -- 06:49 PM AST     Moonset
Fri -- 09:06 PM AST     0.94 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.30.20.20.30.50.811.21.31.31.10.90.70.50.40.40.50.60.80.90.90.90.8

Tide / Current Tables for Vieques Passage, Puerto Rico Current
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Vieques Passage
Click for Map
Fri -- 02:09 AM AST     -0.00 knots Slack
Fri -- 05:07 AM AST     -0.56 knots Max Ebb
Fri -- 06:17 AM AST     Sunrise
Fri -- 06:54 AM AST     Moonrise
Fri -- 07:56 AM AST     0.00 knots Slack
Fri -- 11:16 AM AST     0.75 knots Max Flood
Fri -- 02:26 PM AST     -0.00 knots Slack
Fri -- 05:50 PM AST     -0.83 knots Max Ebb
Fri -- 05:56 PM AST     Sunset
Fri -- 06:50 PM AST     Moonset
Fri -- 09:25 PM AST     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.30-0.2-0.5-0.6-0.5-0.300.30.60.70.70.50.2-0.2-0.5-0.8-0.8-0.7-0.5-0.10.20.4

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 (12,3,4,5)
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Ground Weather Radar Station Puerto Rico,Virgin Islands
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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.