Wednesday, August21, 2019 L-36.com


Marine Weather and Tides
Playita Cortada, PR

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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 6:08AMSunset 6:50PM Wednesday August 21, 2019 11:38 AM AST (15:38 UTC) Moonrise 10:53PMMoonset 10:56AM Illumination 65% 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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AMZ735 Coastal Waters Of Southern Puerto Rico Out 10 Nm- 1021 Am Ast Wed Aug 21 2019
Rest of today..East winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Isolated showers.
Tonight..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..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 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers.
Friday..East winds 15 to 20 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers.
Saturday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Scattered showers.
Sunday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. Isolated showers.
AMZ700 1021 Am 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. A weak tropical wave is expected to increase shower and Thunderstorm activity on Thursday 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 Playita Cortada, PR
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location: 17.98, -66.45     debug


Area Discussion for - San Juan, PR
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Fxca62 tjsj 211437
afdsju
area forecast discussion
national weather service san juan pr
1037 am ast Wed aug 21 2019

Update Passing showers continued to move over eastern puerto
rico and the u.S. Virgin islands from the waters carried under an
east to east-northeast flow. By late morning, streamer- like
showers began to develop downwind from vieques and saint croix. As
the day progresses, showers will continue to develop downwind
from the local islands and downwind from sierra de luquillo into
eastern puerto rico and the san juan metropolitan area. Then,
lingering moisture coupled with diurnal heating and local effects will
aid in the development of showers and thunderstorms along the
interior and sectors of western puerto rico by mid afternoon into
the evening hours. Overall, rainfall accumulations are expected
to peak around an inch, particularly over western puerto rico.

Thus, there is a threat for urban and small stream flooding.

In the wake of this patch of low-level moisture, a narrow area of
drier air will gradually move in while limiting shower activity
during the evening hours. However, moisture from an approaching
weak tropical wave will once again enhance shower and thunderstorm
activity across the region late tonight and continuing through
Friday. The strongest activity is expected over the interior and
western puerto rico each afternoon. Relatively calm conditions are
expected during the weekend.

Aviation MainlyVFR conditions expected across all terminals.

However, vcsh are possible for tjsj, tjps, leeward and usvi
terminals through the next 24 hours. Afternoon convection can
result in brief MVFR conditions with vcts vcsh and bkn030-040 between
21 16-23z. Surface winds from the east at 10-15 knots with higher
gusts, turning light and variable after 21 23z. Winds between
15-20 knots at fl030-060.

Marine Tranquil marine conditions are expected to continue
across the regional waters during the next few days. As the next
tropical wave approaches the region on Thursday into Friday,
small craft operators will need to exercise caution due to high
seas and winds. There is a moderate risk of rip currents for
beaches along the north coast of puerto rico and saint thomas.

Prev discussion issued 503 am ast Wed aug 21 2019
synopsis... A drier air mass is expected to promote fair weather
conditions today. However, diurnally induced afternoon showers and
thunderstorms are expected over portions of the interior and
western puerto rico. Although drier mid level air is expected to
continue through at least Friday, a weak trough and a tropical
wave are expected to increase low level moisture between Thursday
and Saturday. A saharan air layer will bring drier conditions and
saharan dust by the end of the weekend into early next week.

Short term... Today through Friday... .

Fast moving showers embedded in the easterly trade winds continued
to push across the region during the overnight hours and this
morning. Due to their rapid movement rainfall amounts were less than
a tenth of an inch. Recent guidance shows the lingering moisture
holding over puerto through the afternoon. The 00z precipitable
water value showed a total of 2.33 inches, this low-level moisture
is also depicted on the cimss total precipitable site. The low-level
moisture combined with surface heating and orographic effects will
lead to the development of showers and isolated thunderstorms today.

In fact a tutt low moving into the region will aid in shower and
thunderstorm development. The strongest showers and isolated
thunderstorms will develop across portions of the interior and
southwestern areas of puerto rico. Rainfall amounts are expected to
range from 0.50 to 1.00 inches. Also light 0-6 km mean wind flow
could cause showers and isolated thunderstorm to move slowly and
produce rainfall amounts higher than 1.00 inch. Furthermore, soils
remain saturated from previous days rainfall, and additional rain
today could cause urban and small stream this afternoon. Also,
mudslides are possible in areas of steep terrain. Winds will be out
of the east at 10 to 15 mph.

Model guidance shows a narrow band of drier air moving across the
u.S. Virgin islands this afternoon, then across puerto rico later
this evening. The drier air mass will cause showers and
thunderstorms to come to an end once it moves over the aformentioned
areas.

Thursday, the drier air mass is expected to quickly race to the west
of puerto rico as the tutt moves just west of the island. Weak
pertubations and patches of low-level moisture are expected to move
across the area on Thursday. Therefore, showers are forecast to
develop over the u.S. Virgin islands and eastern areas of puerto
rico during the morning, then showers and isolated thunderstorms
across the other areas of puerto rico during the afternoon.

Friday, a tropical wave will bring an influx of moisture into the
area on Friday. The moisture coupled with modest instability and
orographic effects will lead to the development of showers and
isolated thunderstorms mainly across the interior and western areas
of puerto rico. At this time isolated to scattered showers are
forecast for the u.S. Virgin islands and eastern puerto rico.

Afternoon precipitable water values for the last two days in the
short-term period will range from 1.70 to 1.80 inches. A surface
and mid-level ridge will hold across the region today through
Friday.

Long term... Saturday through Wednesday...

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 and as well 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... Vcsh are possible across the u.S. Virgin island until
21 15z. Then shra are expected across tjsj by 21 15z, then shra tsra
are forecast to develop across terminal sites tjmz and tjbq by
21 17z with the activity diminishing by 22 03z. Shra tsra could
cause brief MVFR conditions. Winds will be out of the east at 15 to
20 kts.

Marine... Relative tranquil marine conditions are expected during
the next few days as seas with seas in general at less than 5 feet
and easterly winds between 10-15 kt. However, winds and seas will
gradually increase on Friday and small crafts should exercise
caution by then across the atlantic waters due to seas up to 6
feet and winds up to 20 knots. A moderate risk of rip currents
continues mainly for the northern beaches of pr.

Preliminary point temps pops
Sju 89 78 89 78 30 50 40 60
stt 88 78 90 79 50 60 60 60

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
42085 - Southeast of Ponce, PR 9 mi99 min ENE 5.8 G 9.7 85°F2 ft1016.3 hPa (+1.0)
JOXP4 - Jobos Bay Reserve, Puerto Rico 12 mi114 min E 4.1 90°F 1018 hPa74°F
MGIP4 - 9759110 - Magueyes Islands, PR 32 mi57 min S 8 G 12 85°F 84°F1017.7 hPa
YABP4 - 9754228 - Yabucoa Harbor, PR 33 mi57 min 81°F 74°F
AROP4 - 9757809 - Arecibo, PR 37 mi51 min NE 8.9 G 14
SJNP4 - 9755371 - San Juan, PR 38 mi51 min ENE 11 G 17
41053 - San Juan, PR 39 mi99 min E 12 G 16 84°F 84°F3 ft1016.8 hPa (+1.0)
MGZP4 - 9759394 - Mayaguez, PR 41 mi63 min 85°F 86°F1017.8 hPa

Wind History for Penuelas (Punta Guayanilla), PR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure

Link to 5 minute data for TJPS

Wind History from JPS (wind in knots)
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Last 24hr--------------------------------------E5NE5NE5--Calm
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2 days ago------------------------------------------------

Tide / Current Tables for Playa Cortada, Puerto Rico
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Playa Cortada
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Wed -- 12:13 AM AST     0.71 feet High Tide
Wed -- 02:42 AM AST     0.32 feet Low Tide
Wed -- 06:09 AM AST     Sunrise
Wed -- 10:56 AM AST     Moonset
Wed -- 01:57 PM AST     0.58 feet Low Tide
Wed -- 02:29 PM AST     0.65 feet High Tide
Wed -- 06:48 PM AST     Sunset
Wed -- 10:53 PM AST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.70.60.40.30.30.40.40.50.60.60.60.60.60.60.60.60.60.60.60.60.60.70.70.7

Tide / Current Tables for Playa de Ponce, Puerto Rico
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Playa de Ponce
Click for Map
Wed -- 03:06 AM AST     0.32 feet Low Tide
Wed -- 06:09 AM AST     Sunrise
Wed -- 10:57 AM AST     Moonset
Wed -- 02:12 PM AST     0.65 feet High Tide
Wed -- 02:21 PM AST     0.58 feet Low Tide
Wed -- 06:48 PM AST     Sunset
Wed -- 10:53 PM AST     Moonrise
Wed -- 11:45 PM AST     0.72 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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Weather Map and Satellite Images
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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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Wind Forecast for (11,2,3,4)
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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.