Wednesday, August21, 2019 L-36.com


Marine Weather and Tides
Lomas, 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 6:06AMSunset 6:48PM Wednesday August 21, 2019 8:47 PM AST (00:47 UTC) Moonrise 10:51PMMoonset 10:54AM Illumination 61% Phase: Waning Gibbous; Moon at 21 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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AMZ712 Coastal Waters Of Northern Puerto Rico Out 10 Nm- 402 Pm Ast Wed Aug 21 2019
Tonight..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Isolated showers.
Thursday..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Scattered showers in the morning, then isolated Thunderstorms in the afternoon.
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.
Friday..East winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 7 seconds. Scattered showers in the morning, then isolated Thunderstorms in the afternoon.
Friday 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.
Saturday..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..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Isolated showers.
Monday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Isolated showers.
AMZ700 402 Pm Ast Wed Aug 21 2019
Synopsis for puerto rico and the uS. Virgin islands waters... A broad surface high pressure over the north central atlantic will maintain a moderate east wind flow through the rest of the workweek, with seas up to 6 feet. A weak tropical wave is expected to increase shower and Thunderstorm activity for tomorrow and into Friday. In addition, Thunderstorms can be expected mainly over the coastal waters of western puerto rico each afternoon.


7 Day Forecast for Marine Location Near Lomas, PR
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location: 18.28, -65.93     debug


Area Discussion for - San Juan, PR
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Fxca62 tjsj 211736
afdsju
area forecast discussion
national weather service san juan pr
136 pm ast Wed aug 21 2019

Synopsis A ridge aloft will persist near the area through at
least early in the weekend. This will promote mainly stable
weather conditions aloft with no widespread significant rainfall
activity expected. However, areas of low-level moisture will be
moving over the area through the first part of the weekend,
resulting in some passing showers across portions of eastern
puerto rico and the usvi during the overnight and early morning
hours followed by convection during the afternoon hours across
western puerto rico. A saharan air layer will move overhead late
in the weekend and persist through early next week.

Short term Tonight through Friday...

showers and thunderstorms will persist across interior and
western portions of puerto rico through the late afternoon hours,
before diminishing due to the loss of daytime heating. Thereafter,
mainly fair weather conditions are expected over puerto rico into
early nighttime hours as a patch of much drier than normal air
mass moves over the area. A weak tropical wave, currently over the
leeward islands, will be moving across the area later tonight and
during the day on Thursday. This will bring an increase in low-
level moisture, resulting in an increase in shower activity.

Therefore, expect an increase in scattered showers across the usvi
after 8-9 pm and over eastern puerto rico after midnight and
continuing through the early morning hours of Thursday. Then,
during the midday into the early afternoon hours, as this moisture
combines with strong daytime heating and local effects in the
form of sea breeze convergence and topographical forcing, expect
showers to develop over northwest puerto rico and possibly
downwind from the usvi and from EL yunque, affecting the san juan
metro area, as the low-level flow becomes southeasterly.

Similar weather conditions can be expected for Friday as low-
level moisture will persist across the region. Therefore,
continue to expect some passing showers across the regional
waters, with some of the activity affecting portions of eastern
puerto rico and the usvi during the early to mid-morning hours.

This will be followed by afternoon showers and isolated
thunderstorms across northwest puerto rico as the low-level
moisture combines with daytime heating and sea breeze convergence.

Additional showers in the form of streamers may be possible
downwind of the usvi and also downwind from EL yunque, affecting
the san juan metro area.

Given that there will be an upper-level ridge overhead during the
short term period, causing subsidence aloft, organized convective
activity is not expected over the area. As a result, widespread
significant rainfall activity is not anticipated.

Long term Saturday through Wednesday...

Prev discussion issued 503 am ast Wed aug 21 2019
lingering moisture associated to a tropical wave will continue
over the region on Saturday. This moisture in combination with
daytime heating and other local effects will result in showers and
thunderstorms developing during the afternoon hours over portions
eastern pr as well as along the interior and western sections of
pr. Urban and small stream flooding is expected with this
activity. Across the usvi, isolated to scattered showers are
expected. Trade winds are expected to increase on Sunday as a low
to mid level high moves from the east. A saharan air layer will
bring saharan dust and hazy conditions are forecast between Sunday
and Monday. Regardless, the available low level moisture in
combination with diurnal effects will cause showers and possible
isolated thunderstorms to develop over western pr. The 700mb high
is forecast to move west of the region by Tuesday morning and this
will allow for better moisture to pool over the region and as
steering winds turn from the northeast, showers and thunderstorms
are expected to develop over and south of the cordillera central
each afternoon.

Aviation MainlyVFR conditions expected during the next 24
hours. However, afternoon convection may result in brief MVFR
conditions at tjmz and tjbq between 21 16-23z due to vcts and bkn
at fl020-030. Vcsh possible across tjsj, tjps, usvi and leeward
terminals through the entire period. Winds will be out of the east
at 10 to 15 kts with higher gusts possible, turning light and
variable after 21 23z.

Marine Mainly tranquil marine conditions are expected to continue
during the rest of the work week with seas between 2 and 5 feet
and winds up to 15 knots. There is a moderate risk of rip currents
for the northern beaches of puerto rico through tonight.

Preliminary point temps pops
Sju 78 89 78 89 50 40 60 50
stt 78 90 79 89 60 60 60 30

Sju watches warnings advisories
Pr... None.

Vi... None.

Am... None.

Short term... Icp
long term... .Gl


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
41053 - San Juan, PR 16 mi47 min E 14 G 16 84°F 84°F3 ft1014.6 hPa (+0.5)
SJNP4 - 9755371 - San Juan, PR 16 mi47 min E 12 G 15 84°F 85°F1015.6 hPa (+0.5)
YABP4 - 9754228 - Yabucoa Harbor, PR 16 mi47 min 84°F 73°F
JOXP4 - Jobos Bay Reserve, Puerto Rico 27 mi62 min ENE 2.9 82°F 1016 hPa73°F
ESPP4 - 9752695 - Esperanza, PR 28 mi47 min NE 2.9 G 4.1 80°F 86°F1015.7 hPa (+0.5)
CLBP4 - 9752235 - Culebra, PR 33 mi47 min 83°F 87°F1015.7 hPa (+0.6)
AROP4 - 9757809 - Arecibo, PR 43 mi47 min E 4.1 G 9.9

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, PR11 mi1.9 hrsE 1210.00 miPartly Cloudy83°F73°F74%1015.2 hPa

Link to 5 minute data for TJSJ

Wind History from JSJ (wind in knots)
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Last 24hrE6E11--------Calm--SW3CalmCalm--E12E10NE15E15E18E17
G23
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G23
E13E14E12E9
1 day agoE10E9------E3Calm--S3CalmCalmE4E8E10E15S15SW3NE3E13NE15E16E12E9E10
2 days agoE7E10--------E7E4--CalmE5E4E6E11SE6NE16
G20
E5E8NE11E9E5E7E7E9

Tide / Current Tables for Boca De Cangrejos, Isla Verde, San Juan, Puerto Rico
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Boca De Cangrejos
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Wed -- 12:40 AM AST     1.04 feet High Tide
Wed -- 06:06 AM AST     Sunrise
Wed -- 06:58 AM AST     0.21 feet Low Tide
Wed -- 10:55 AM AST     Moonset
Wed -- 01:31 PM AST     1.12 feet High Tide
Wed -- 06:46 PM AST     Sunset
Wed -- 07:35 PM AST     0.44 feet Low Tide
Wed -- 10:50 PM AST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1110.80.60.40.30.20.30.40.60.811.11.110.90.70.50.50.40.50.60.8

Tide / Current Tables for Vieques Passage, Puerto Rico Current
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Vieques Passage
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Wed -- 12:09 AM AST     0.00 knots Slack
Wed -- 02:47 AM AST     0.40 knots Max Flood
Wed -- 05:25 AM AST     -0.00 knots Slack
Wed -- 06:05 AM AST     Sunrise
Wed -- 08:42 AM AST     -0.57 knots Max Ebb
Wed -- 10:53 AM AST     Moonset
Wed -- 11:46 AM AST     0.00 knots Slack
Wed -- 03:06 PM AST     0.67 knots Max Flood
Wed -- 06:24 PM AST     -0.00 knots Slack
Wed -- 06:45 PM AST     Sunset
Wed -- 09:37 PM AST     -0.62 knots Max Ebb
Wed -- 10:49 PM AST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-00.20.40.40.30.1-0.1-0.4-0.5-0.6-0.5-0.20.10.40.60.70.60.40.1-0.2-0.4-0.6-0.6-0.5

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 (20,4,5,8)
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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.