Saturday, August17, 2019 L-36.com


Marine Weather and Tides
Luis M. Cintrón, PR

Version 3.4
NOTICE
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:03AMSunset 6:49PM Saturday August 17, 2019 9:18 PM AST (01:18 UTC) Moonrise 8:27PMMoonset 7:41AM Illumination 94% Phase: Waning Gibbous; Moon at 17 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- 354 Pm Ast Sat Aug 17 2019
Tonight..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated Thunderstorms in the evening. Scattered showers through the night.
Sunday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Scattered showers through the day. Isolated Thunderstorms in the afternoon.
Sunday night..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Numerous showers and isolated Thunderstorms.
Monday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Numerous showers and isolated Thunderstorms.
Monday night..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Numerous showers and isolated Thunderstorms.
Tuesday..Northeast winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Numerous showers. Isolated Thunderstorms.
Wednesday..East winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 10 seconds. Scattered showers.
Thursday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Scattered showers.
AMZ700 354 Pm Ast Sat Aug 17 2019
Synopsis for puerto rico and the uS. Virgin islands waters... A surface high pressure centered across the north central atlantic and a surface trough moving across the regional waters will help to maintain moderate to fresh east winds across the local waters. A tropical wave is forecast to move through the area bringing additional showers and isolated Thunderstorms late Sunday through Tuesday night.


7 Day Forecast for Marine Location Near Luis M. Cintr�n, PR
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location: 18.32, -65.64     debug


Area Discussion for - San Juan, PR
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Fxca62 tjsj 171758
afdsju
area forecast discussion
national weather service san juan pr
158 pm ast Sat aug 17 2019

Synopsis
An induced surface trough is producing showers and thunderstorms
across the local islands. This activity will spread across the
western interior and western sections of puerto rico through this
evening. A tropical wave will bring showers and thunderstorms
Sunday through Tuesday.

Short term Tonight through Monday...

an upper-level trough is inducing a surface trough across the
islands today. This trough will continue to produce periods of
showers and thunderstorms through this evening. Urban and small
stream flooding, frequent lightning and brief gusty winds are
possible with this activity.

Activity should diminish overnight, as a relative drier air mass
ahead of a tropical wave moves from the east across the
archipelago of the u.S. Virgin islands and puerto rico. However,
the proximity of an upper-level trough will keep alive the
potential for shower and thunderstorm formation across the local
waters and the windward sections overnight and Sunday morning.

The leading edge of a tropical wave is expected to increase the
potential for shower and thunderstorm formation by Sunday
afternoon. The available moisture combined with local effects and
the diurnal heating will aid in another round of heavy showers
and thunderstorms over the west sections of the islands and
between the usvi and eastern pr waters.

At this time, a wet and unstable weather pattern is likely
through the short term period. It is important to mention that
goes-16 detected a dry air mass with saharan dust surrounding the
aforementioned tropical wave, which could weakens this feature.

Total rainfall accumulations should range between 2 and 4 inches
with locally higher amounts.

Long term Tuesday through Saturday...

high pressure at upper levels will have nosed in from the east
northeast over the local area by Tuesday. Although lower pressure
will be southeast high pressure will hold to the north through the
end of the period and be the dominant influence over the weather.

Behind the tropical wave that moved through late Sunday and Monday
a band of moisture will flow over the area in east southeast flow
until a 700 mb ridge passes on Tuesday afternoon (20 18z). Then
flow will switch to east northeast at 700 mb and bring some of the
moisture back over the area. This will allow good convection over
puerto rico during the afternoon and evening. This flow will also
be weakly reflected in the surface flow so as to keep temperatures
on the north coast more moderate and generally no higher than the
lower 90s a few miles inland. Conditions on Wednesday and
Thursday become more stable and moisture will fall below 2 inches
of precipitable water on Tuesday night with only minor peaks on
Wednesday night and Thursday evening to bring enhancement to
shower activity. Thunderstorms should be limited, if any, to the
afternoon in western puerto rico Wednesday. Although moisture
will continue low Wednesday through Friday, some disturbances will
trigger scattered showers Thursday afternoon and Friday night
into Saturday.

Aviation
MainlyVFR conditions expected across tist tisx tncm tkpk tjps.

Tempo MVFR to brief ifr conditions are possible across tjmz tjbq,
with brief MVFR conditions possible across tjsj. It'll be breezy
during thunderstorm activity as well. In general, winds will be
out of the east at 10 to 20 knots.

Marine
A surface high pressure centered across the north central
atlantic and a surface trough moving across the regional waters
will help to maintain moderate to fresh east to northeast winds
across the local waters. Seas will continue between 4 and 6 feet
across open waters and below 4 feet across protected areas.

Thunderstorm formation will continue across the coastal western
waters of puerto rico and the mona passage through this evening,
as well as across the surrounding waters of the u.S. Virgin
islands and eastern pr. Brief gusty winds and torrential rainfall
are expected with this activity.

Small craft advisories are not expected through much of the
forecast cycle. Brief gusty winds, torrential rains and frequent
lightning will accompany thunderstorms generated by a passing
tropical wave Sunday night through Tuesday night.

Preliminary point temps pops
Sju 79 89 78 86 20 40 60 70
stt 80 88 78 88 40 50 70 60

Sju watches warnings advisories
Pr... None.

Vi... None.

Am... None.

Short term... Erg
long term... .Cam
aviation... Erg


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CLBP4 - 9752235 - Culebra, PR 18 mi54 min 83°F 86°F1017 hPa
ESPP4 - 9752695 - Esperanza, PR 18 mi48 min NE 2.9 G 5.1 81°F 85°F1017.2 hPa
YABP4 - 9754228 - Yabucoa Harbor, PR 21 mi48 min 76°F 72°F
SJNP4 - 9755371 - San Juan, PR 27 mi48 min SSE 2.9 G 5.1 80°F 85°F1017.5 hPa
CHAV3 - 9751639 - Charlotte Amalie, VI 38 mi48 min 82°F 1016.9 hPa
JOXP4 - Jobos Bay Reserve, Puerto Rico 40 mi93 min NE 2.9 80°F 1017 hPa73°F
41052 - South of St. John, Virgin Islands 47 mi48 min E 16 G 19 85°F 1015.4 hPa
LAMV3 49 mi48 min 83°F 86°F

Wind History for Fajardo, PR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Juan, Luis Munoz Marin International Airport, PR21 mi82 minN 010.00 miPartly Cloudy79°F73°F84%1016.9 hPa

Link to 5 minute data for TJSJ

Wind History from JSJ (wind in knots)
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Last 24hrE9NE9--NE9--E8SE4CalmSE6
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S3Calm3E9E11NE16SE4E4E6E10W5E5CalmW3Calm
1 day agoE12E15E12E10E10--E10E5E8E5E9--NE12E11NE11NE12
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E18E15E15E13--

Tide / Current Tables for Playa de Fajardo, Puerto Rico
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Playa de Fajardo
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Sat -- 04:22 AM AST     0.54 feet Low Tide
Sat -- 06:04 AM AST     Sunrise
Sat -- 07:41 AM AST     Moonset
Sat -- 09:48 AM AST     1.19 feet High Tide
Sat -- 03:48 PM AST     0.29 feet Low Tide
Sat -- 06:48 PM AST     Sunset
Sat -- 08:26 PM AST     Moonrise
Sat -- 10:34 PM AST     1.57 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.41.10.90.60.50.60.70.811.21.21.10.90.70.50.30.30.40.60.91.21.41.51.6

Tide / Current Tables for Vieques Passage, Puerto Rico Current
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Vieques Passage
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Sat -- 02:50 AM AST     -0.00 knots Slack
Sat -- 06:04 AM AST     Sunrise
Sat -- 06:20 AM AST     -0.76 knots Max Ebb
Sat -- 07:41 AM AST     Moonset
Sat -- 09:50 AM AST     0.00 knots Slack
Sat -- 12:44 PM AST     0.55 knots Max Flood
Sat -- 03:50 PM AST     -0.00 knots Slack
Sat -- 06:40 PM AST     -0.47 knots Max Ebb
Sat -- 06:47 PM AST     Sunset
Sat -- 08:26 PM AST     Moonrise
Sat -- 09:31 PM AST     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.50.3-0.1-0.4-0.6-0.8-0.7-0.6-0.300.30.50.50.40.2-0-0.3-0.4-0.5-0.3-0.10.10.4

Weather Map and Satellite Images
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wmap_A
GOES Local Image of    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 (21,6,7,8)
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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.