Wednesday, March29, 2017 L-36.com


Marine Weather and Tides
Luis M. Cintr�n, PR

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:17AMSunset 6:36PM Wednesday March 29, 2017 3:09 PM AST (19:09 UTC) Moonrise 7:34AMMoonset 8:21PM Illumination 5% Phase: Waxing Crescent; Moon at 2 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- 1054 Am Ast Wed Mar 29 2017
Rest of today..North winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Scattered showers.
Tonight..North winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Isolated showers through the night.
Thursday..Northeast winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. Scattered showers.
Thursday night..Northeast winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 11 seconds. Northeast swell around 4 feet after midnight. Isolated showers.
Friday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 11 seconds. Northeast swell 4 to 5 feet. Scattered showers.
Saturday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 11 seconds. East swell around 4 feet. Scattered showers.
Sunday..East winds 5 to 10 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 12 seconds. East swell around 4 feet. Scattered showers.
AMZ700 1054 Am Ast Wed Mar 29 2017
Synopsis for puerto rico and the uS. Virgin islands waters... A low pressure system will move northeast into the central atlantic while a high pressure moves across the southwestern atlantic. This will allow the local winds to gradually shift from a northerly direction the rest of today. Winds are expected to become from the northeast by the end of the workweek into the weekend. A northerly swell is forecast to reach the atlantic offshore waters and caribbean passages by Thursday.

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


Area Discussion for - San Juan, PR
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Fxca62 tjsj 291603
afdsju
area forecast discussion
national weather service san juan pr
1203 pm ast Wed mar 29 2017

Update
Mostly sunny skies with little or no shower activity prevailed
today in puerto rico and the u.S. Virgin islands. A northerly wind
flow combined with the lingering moisture, diurnal heating and sea
breeze variations will result in afternoon convection over the
eastern interior and southeast sections of puerto rico and downwind
from the u.S. Virgin islands. The morning package was updated to
introduce a light to moderate risk of flooding rain over the east
interior and southeastern sections of mainland puerto rico.

Aviation
Most of the shra/tsra are expected downwind from tjsj/tist/tisx
this afternoon. However, passing -shra/shra are possible across
these terminals from time to time through the fcst prd. Tjbq/tjmz
can expectVFR conditions most of the period. Shra/+shra with vcts
and bkn-ovc ceiling btwn fl020-fl070 expected across tncm/tkpk/
tjps btwn 29/16-22z. Shra should diminish across the terminals
after 29/23z. Sfc winds from the N around 10 knots with sea
breeze variations til 29/22z, then calm to light and vrb winds.

Marine
Tranquil marine weather conditions will persist today with seas
below 5 feet and northerly winds from the N to NE at less than 15
knots. A northerly swell is expected to reach the islands by
Thursday. Therefore the risk of rip currents is expected to
increase along the north facing beaches of pr and the usvi by
Thursday.

Prev discussion /issued 353 am ast Wed mar 29 2017/
synopsis... A surface high across the southwest atlantic will
push the surface low to the northeast of the region further
northeast well away from the local islands. As this happens, the
local winds will shift to the north northeast today. Lingering
moisture across the region will combine with local effects to
induce the development of showers and possible thunderstorms along
and south of cordillera central today. Winds are expected to
become more easterly by the weekend as the surface high drift
eastward while weakening. North swell is expected to affect the
local waters late Wednesday and Thursday.

Short term... Today through Friday...

partly cloudy skies prevailed across the local islands overnight.

Some light passing showers were seen across the caribbean coastal
waters. Local area remains under the influence of a surface low
pressure system which was located several hundred miles northeast of
the area. Trailing moisture associated with this feature will
continue to aid in the development of showers and possible
thunderstorms mainly over the cordillera central of puerto rico. The
difference today it is that the wind has shifted northerly. As a
result,shower activity will be focus mainly over the southern slopes
of puerto rico.

As the aformentioned area of low pressure continue to move away from
the area, a drier airmass is expected to encompass the region
Thursday and Friday as a high pressure system builds across the
western atlantic.

Long term... Saturday through Wednesday...

a weak surface high pressure is expected to develop across the
central atlantic early in the weekend to maintain an easterly trade
wind flow across the local islands Saturday and Sunday. At the same
time a surface low emerging across the northeastern united states
seaboard will push the surface high eastward while weakening. As
this happens patches of moisture associated with a frontal
remnants will combine with local effects both days to produce an
increase in cloudiness and shower activity across puerto rico and
the u.S. Virgin islands during the weekend, but at this time not
widespread or significant precipitation is expected during this
period.

As the aforementioned surface low and associated frontal boundary
moves northeastward toward the north central atlantic, another
stronger surface high is expected to develop and drift across the
western atlantic. This feature will bring an east northeast trade
wind flow across the forecast area late Monday through at least
Wednesday. An upper level ridge is expected to build and
strengthening over the northeast caribbean during the weekend and
is expected to persist over the region through at least Wednesday.

This feature will inhibit the development of widespread or deep
convection across the local islands during the forecast period,
but moisture embedded in the trades will continue to combine with
local effects to produce some shower activity across western and
interior puerto rico each day.

Aviation... MainlyVFR conditions are expected to prevail across all
taf sites through at least 29/16z. Periods of MVFR conditions can be
expected across tjps and tjmz between 29/16z through 29/22z in shra.

Low level winds will be mainly north and northwest at 10 kts or
less.

Marine... Seas of 3 to 5 feet will continue to prevail across
the atlantic waters, with seas 2 to 4 feet across the caribbean
waters. A moderate risk of rip current will continue across the
atlantic shoreline of puerto rico today and tonight. A northerly
swell will arrive across the local waters late Wednesday into
Thursday with seas increasing up to 6 feet.

Preliminary point temps/pops
Sju 84 75 84 74 / 20 30 30 10
stt 84 74 85 73 / 40 30 30 20

Sju watches/warnings/advisories
Pr... None.

Vi... None.

Am... None.

Short term... Cam
long term... .99


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FRDP4 - 9753216 - Fajardo, PR 1 mi52 min N 8 G 11 80°F 72°F
41056 11 mi70 min N 9.7 G 12 79°F 81°F2 ft1012.5 hPa (-1.7)
VQSP4 - 9752619 - Isabel Segunda, Vieques, PR 16 mi52 min NNE 6 G 9.9 81°F
CLBP4 - 9752235 - Culebra, PR 18 mi52 min 83°F 82°F1013.2 hPa
ESPP4 - 9752695 - Esperanza, PR 18 mi52 min NNE 2.9 G 11 82°F 82°F1012.9 hPa
YABP4 - 9754228 - Yabucoa Harbor, PR 21 mi52 min ENE 8 G 12
SJNP4 - 9755371 - San Juan, PR 27 mi58 min N 2.9 G 8.9 84°F 82°F1013.4 hPa
41053 - San Juan, PR 27 mi70 min N 12 G 14 80°F 82°F3 ft1012.9 hPa (-1.8)
CHAV3 - 9751639 - Charlotte Amalie, VI 38 mi52 min NW 6 G 9.9 84°F 83°F
JOXP4 - Jobos Bay Reserve, Puerto Rico 40 mi85 min SE 5.1 85°F 1014 hPa71°F
41052 - South of St. John, Virgin Islands 47 mi70 min NW 14 G 16 81°F 81°F2 ft1012.1 hPa (-1.6)
LAMV3 49 mi52 min 86°F 83°F

Wind History for Fajardo, PR
(wind in knots)    EDIT      (on/off)   Help
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NW4
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NW2
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S8
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G14
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G6
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G11
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S5
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G6
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G11
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G15
SE7
G13
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G18
S7
G18

Airport Reports
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Tide / Current Tables for Playa de Fajardo, Puerto Rico
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Playa de Fajardo
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Wed -- 03:47 AM AST     0.05 feet Low Tide
Wed -- 06:19 AM AST     Sunrise
Wed -- 07:34 AM AST     Moonrise
Wed -- 09:43 AM AST     1.23 feet High Tide
Wed -- 03:44 PM AST     -0.09 feet Low Tide
Wed -- 06:35 PM AST     Sunset
Wed -- 08:21 PM AST     Moonset
Wed -- 10:23 PM AST     1.61 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
10.60.30.10.10.20.40.711.21.21.10.80.50.2-0-0.10.10.30.71.11.41.61.6

Tide / Current Tables for Vieques Passage, Puerto Rico Current
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Vieques Passage
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Wed -- 02:45 AM AST     -0.00 knots Slack
Wed -- 06:03 AM AST     -0.89 knots Max Ebb
Wed -- 06:18 AM AST     Sunrise
Wed -- 07:34 AM AST     Moonrise
Wed -- 09:26 AM AST     0.00 knots Slack
Wed -- 12:16 PM AST     0.66 knots Max Flood
Wed -- 03:11 PM AST     -0.00 knots Slack
Wed -- 06:13 PM AST     -0.70 knots Max Ebb
Wed -- 06:35 PM AST     Sunset
Wed -- 08:21 PM AST     Moonset
Wed -- 09:08 PM AST     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.80.60.3-0.1-0.5-0.8-0.9-0.8-0.5-0.20.20.50.70.60.40.1-0.3-0.6-0.7-0.6-0.4-0.10.30.7

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 (15,3,4,5)
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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.