Sunday, November19, 2017 L-36.com


Marine Weather and Tides
Isabela, 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 6:36AMSunset 5:51PM Sunday November 19, 2017 8:01 AM AST (12:01 UTC) Moonrise 7:27AMMoonset 6:59PM Illumination 1% Phase: New Moon; Moon at 1 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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AMZ742 Coastal Waters Of Northwestern Puerto Rico Out 10 Nm- 450 Am Ast Sun Nov 19 2017
Today..East winds 5 to 10 knots veering south in the afternoon. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. North swell around 4 feet. Scattered showers and isolated Thunderstorms.
Tonight..South winds 5 to 10 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. North swell around 4 feet. Isolated Thunderstorms in the evening. Scattered showers through the night.
Monday..Northeast winds 5 to 10 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. North swell around 4 feet. Numerous showers and isolated Thunderstorms.
Monday night..Southeast winds 5 to 10 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 8 seconds. North swell around 4 feet in the evening. Isolated showers.
Tuesday..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Scattered showers.
Wednesday..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Isolated showers.
Thursday..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Northeast swell around 4 feet. Isolated showers.
AMZ700 450 Am Ast Sun Nov 19 2017
Synopsis for puerto rico and the uS. Virgin islands waters... A frontal boundary and associated moisture will continue to linger across the local atlantic waters throughout the day. This will result in periods of showers and Thunderstorms. Easterly winds and a more stable air mass are expected across the local waters on Tuesday.

7 Day Forecast for Marine Location Near Isabela zona urbana, PR
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location: 18.5, -67.01     debug


Area Discussion for - San Juan, PR
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Fxca62 tjsj 190920
afdsju
area forecast discussion
national weather service san juan pr
520 am ast Sun nov 19 2017

Synopsis Periods of showers and thunderstorms are still expected
today under plenty of moisture associated with a frontal boundary
to the north and west of the area. A more seasonable weather pattern
is expected to prevail Tuesday through the upcoming weekend as a
mid to upper level ridge builds across the area.

Short term Today thru Tuesday...

as the frontal boundary continues very close to our local area to
the north and west, we will continue to be in the moist side of it,
with precipitable water values near 2.2 inches through today, which
is well above normal. Showers and thunderstorms under mostly cloudy
skies are expected across much of the local area today once again,
although the areas with best chance of showers and thunderstorms
seem to be the western, southern and eastern sections of pr as well
as the usvi, in particular the northern usvi. The latest high
resolution guidance puts an area of high rainfall accumulations very
close to saint thomas with upper level divergence persisting in the
afternoon hours. Showers and thunderstorms have been observed during
the overnight hours across the local waters and recently over
western pr, producing moderate rainfall. The western sections of
pr and the local waters are expected to observe persistent rain
through the morning with rainfall activity gradually developing
across southern and eastern pr by the afternoon hours. For that
reason we have scattered to numerous showers with isolated
thunderstorms in the forecast for today.

There continues to be some disagreement amongst the high resolution
guidance. The WRF model is once again bullish on the amount of
rainfall across puerto rico today, which if it were to verify, we
would have a very active day. The nmm and arw models, which did not
do as well yesterday, are much less rainy than the WRF but still
shows some areas with significant rain, having said that, they do
not seem to have initialized well, showing much less rainfall than
there is already. So we decided to lean more on the WRF model but
not quite as bullish since the other models did not initialize well
and the WRF seems to at least have a decent handle on the rainfall
coverage area. There is a good chance for urban and small stream
flooding across many areas in puerto rico today.

The latest guidance has backed off a bit in terms of when the
weather will improve. Up until yesterday the models were suggesting
some improvement on Monday, but now everything points towards
another active day on Monday. Plenty of moisture still available on
Monday with divergence in the upper levels over eastern pr and the
usvi with a southeasterly wind flow. This setup is conducive for
shower and thunderstorm development over the usvi, as well as
northern and eastern pr, including the san juan metro area. These
areas in pr have observed enough rainfall in the past several days,
any significant additional rainfall may result in some flooding.

Weather is expected to start to improve on Tuesday, moisture
decreasing to normal or below normal levels, and the rainfall that
is expected will mostly be over the local waters. Some showers
are possible on Tuesday across the northwestern quadrant of pr
with only a slight chance of showers elsewhere.

Long term Wednesday thru Monday...

although a mid to upper level ridge will hold across the forecast
area much of the forecast period, easterly winds will continue to
bring patches of low level moisture across the local isles to keep
the chance of passing showers each day. Therefore, expect a
seasonable weather pattern with passing showers across usvi and e
pr as well as limited shower activity across west puerto rico wed-
sat. As the ridge aloft erodes the upcoming weekend, the chance
for isolated thunderstorms will increase.

Aviation Shra tsra expected to continue across the local area
today, causing vcsh vcts across the terminals with tempo MVFR conds
possible at tjbq and tjmz since early this morning. CIGS will be
mainly above fl120 before 19 14z... Except for tjbq and tjmz which
may have lower CIGS by 19 10z with shra. After 19 14z as shra tsra
activity increases, CIGS will be lower, possibly at fl050 or below
at times. Winds will be mainly light and southeasterly, but tjsj may
observe light and variable winds today.

Marine Seas 3 to 5 feet with occasionally seas up to 6 feet
are expected across the atlantic waters. Elsewhere seas of 2 to 4
feet. Southeasterly winds around 10 knots to continue.

Preliminary point temps pops
Sju 85 77 86 77 40 60 60 20
stt 85 78 85 79 60 50 50 30

Sju watches warnings advisories
Pr... Flash flood watch until 2 pm ast this afternoon for northwest-
western interior.

Vi... None.

Am... None.

Short term... Ja
long term... .Om


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
41053 - San Juan, PR 48 mi61 min S 1.9 G 3.9 80°F 83°F4 ft1008.9 hPa (+0.8)

Wind History for Arecibo, PR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Aquadilla, Rafael Hernandez Airport, PR6 mi71 minN 010.00 miOvercast82°F73°F74%1010.2 hPa

Wind History from JBQ (wind in knots)
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Last 24hrE3CalmCalmCalmCalmCalmW3W3W3CalmCalmCalmCalm--CalmCalmCalmCalmCalmS6CalmCalmCalmCalm
1 day agoSW3CalmSW5SW5W5E6SW5W5W4W4SW5SW5SW5----------------------
2 days agoS6SW5SW11
G17
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S7SW6----------SW6--------------------CalmCalm

Tide / Current Tables for Aguadilla, Crashboat Beach, Puerto Rico
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Aguadilla
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Sun -- 02:17 AM AST     -0.04 feet Low Tide
Sun -- 06:37 AM AST     Sunrise
Sun -- 07:26 AM AST     Moonrise
Sun -- 08:59 AM AST     1.47 feet High Tide
Sun -- 03:34 PM AST     0.18 feet Low Tide
Sun -- 05:50 PM AST     Sunset
Sun -- 06:59 PM AST     Moonset
Sun -- 08:48 PM AST     0.86 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.30.1-000.20.50.81.21.41.51.41.20.90.60.40.20.20.30.50.70.80.90.80.6

Tide / Current Tables for Mayaguez, Puerto Rico
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Mayaguez
Click for Map
Sun -- 02:22 AM AST     0.06 feet Low Tide
Sun -- 06:37 AM AST     Sunrise
Sun -- 07:26 AM AST     Moonrise
Sun -- 09:22 AM AST     1.77 feet High Tide
Sun -- 04:09 PM AST     0.51 feet Low Tide
Sun -- 05:50 PM AST     Sunset
Sun -- 07:00 PM AST     Moonset
Sun -- 08:45 PM AST     0.98 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.20.10.10.30.611.31.61.81.71.61.310.80.60.50.60.70.80.910.90.7

Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
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GOES Local Image of Puerto Rico    EDIT
Geos

Wind Forecast for (7,2,3,4)
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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.