Friday, August18, 2017 L-36.com


Marine Weather and Tides
Naranjito, 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 6:06AMSunset 6:49PM Friday August 18, 2017 11:40 PM AST (03:40 UTC) Moonrise 2:48AMMoonset 4:12PM Illumination 10% Phase: Waning Crescent; Moon at 26 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- 901 Pm Ast Fri Aug 18 2017
.small craft should exercise caution...
.small craft advisory in effect from 2 am ast Saturday through Saturday evening...
Rest of tonight..East winds 15 to 20 knots. Seas increasing 5 to 7 feet with occasional seas up to 9 feet. Dominant period 8 seconds. North swell around 4 feet after midnight. Isolated showers.
Saturday..East winds 15 to 20 knots. Seas 5 to 7 feet with occasional seas up to 9 feet. Dominant period 8 seconds. North swell around 4 feet. Isolated showers in the morning, then isolated Thunderstorms in the afternoon.
Saturday night..East winds 15 to 20 knots. Seas 5 to 7 feet with occasional seas up to 9 feet. Dominant period 8 seconds. North swell around 4 feet in the evening. Scattered showers and isolated Thunderstorms.
Sunday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. Northeast swell around 4 feet in the afternoon. Scattered showers and isolated Thunderstorms.
Sunday night..East winds 10 to 15 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 10 seconds. Northeast swell 4 to 5 feet. Scattered showers in the evening. Isolated Thunderstorms through the night.
Monday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 8 seconds. Scattered showers.
Tuesday..East winds 5 to 10 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. Northeast swell around 4 feet. Scattered showers.
Wednesday..Southeast winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Scattered showers.
AMZ700 901 Pm Ast Fri Aug 18 2017
Synopsis for puerto rico and the uS. Virgin islands waters... Based on the latest advisory from the national hurricane center tropical storm harvey was located near lat 13.4n...lon 62.9w. Harvey is forecast to move westward across the caribbean sea and pass well south of the forecast area overnight through Saturday morning. However, this will result in hazardous seas mainly across the caribbean waters and local passages. An area of low pressure east of the leeward islands is also expected to reach the forecast area by early next week. As a result, winds and seas are forecast to increase across the offshore atlantic waters late Sunday through Monday.

7 Day Forecast for Marine Location Near Naranjito, PR
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location: 18.31, -66.18     debug


Area Discussion for - San Juan, PR
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Fxca62 tjsj 190046
afdsju
area forecast discussion
national weather service san juan pr
846 pm ast Fri aug 18 2017

Update
Was a very dry and stable afternoon with minimal shower activity
across the local islands and surrounding waters. However, as
tropical storm harvey continues to moves westward across the
southern caribbean tonight and tomorrow morning, the moisture in
the northern periphery will increase the shower and thunderstorm
activity across the region. In facts, latest radar observations
indicated isolated to scattered showers moving across the u.S.

Virgin islands and the surrounding waters this evening. This
activity will continue to increase overnight and early Saturday
morning, but not widespread precipitation is expected. The center
of tropical storm harvey is forecast to pass well south of the
islands overnight through Saturday morning
this moisture in combination with daytime heating and local
effects will increase the development of showers and
thunderstorms across the region tomorrow afternoon. A high
moisture content of the local atmosphere will continue Sunday and
Monday, as the area of low pressure invest 92l... Located to the east
northeast of the northern leeward islands moves to the north but
close to puerto rico. Thus a moist and unstable weather pattern
will continue across the region into early next week.

Aviation MostlyVFR conditions expected across the local flying
area overnight with only vcsh across the leewards and usvi taf
sites. Winds will remain at 10 to 15kt overnight with shra
increasing after around the usvi and leeward islands. Winds will
increase after 19 12z t 15 to 20kt with higher gusts.

Marine Small craft advisory remain in effect through Monday
morning due to increasingly hazardous coastal winds and seas.

Tropical storm hervey will pass well to our south, but the winds
will increase across the local offshore caribbean waters tomorrow
and seas could increase to 9 feet and occasionally up to 10 feet.

Prev discussion issued 550 pm ast Fri aug 18 2017
synopsis... Fair weather skies prevailed across the region today as
drier air continued to spread across the region today. Only a few
isolated showers were so far noted over the coastal waters with no
significant accumulations expected to affect the islands the rest
of today. The moderate to strong east to northeast prevailing winds
continued to push most of the clouds quickly to the west southwest
and therefore limited significant development. Based on the latest
advisory from the national hurricane center at 500 pm ast... Tropical
storm harvey was located near lat 13.4n... Lon 62.9w... Is forecast
to move westward across the caribbean sea and pass well south of the
forecast area tonight through Saturday.

Short term... Rest of today through Sunday...

moisture will continue to erode with precipitable water expected
to drop to less than 1.50 inches by early Saturday, as drier air
will filter in from the northeast and a mid to upper level ridge
will build across the region from the northeast. In addition,
aerosol products and model guidance all suggests the presence of
saharan dust particulates across the region. Therefore, fairly dry
and sable conditions should prevail through Saturday morning.

By Saturday afternoon, expect increasing cloudiness and moisture
once again due to peripheral moisture from harvey propagating
northwards across the region. The center of tropical storm harvey
is forecast to move well south of the islands and across the
caribbean waters overnight through Saturday. Although no direct
impact of harvey is anticipated across the region, a gradual
increase in moisture is likely by Saturday afternoon. As a result,
shower and thunderstorm activity is expected to increase during
the afternoon hours.

Increasing moisture and instability aloft is expected to continue
on Sunday, as an area of low pressure invest 92l... Located east
of northern leeward islands is forecast to move just northeast of
the region. Based on the latest information of the national hurricane
center, this system has a 60 percent chance of formation in the next
48 hours and should continue to move northeast of the islands as a
tropical wave. Model guidance all suggest a moist and unstable weather
pattern across the region into early next with good potential for early
morning and afternoon convection across the islands. Some of this activity
may produce periods of locally heavy rainfall in isolated areas.

Long term... Monday through Saturday... Although by Monday, the axis
of the tropical wave 92l should be west and northwest of the region,
expected an elongated plume of moisture to be lifted across the region
in the prevailing east to southeast wind flow. Therefore, the potential
for showers and thunderstorms across the region will continue at least
through the middle of next week. A gradual drying trend and stable conditions
is expected by Thursday and into the weekend.

Aviation...VFR conds expected through the forecast period. Winds
will continue from the east to ene at about 15kt through the
afternoon. Slight chance of shra at tjmz after 18 18z could cause
vcsh but it should be brief. Winds to remain at 10 to 15kt overnight
with shra increasing after 19 00z around the usvi.

Marine... Small craft advisory in effect through Monday morning
due to increasingly hazardous coastal winds and seas. Tropical
storm hervey will pass well to our south, but the winds will increase
across the local offshore caribbean waters on Saturday and seas could
increase to 9 feet and occasionally up to 10 feet.

Preliminary point temps pops
Sju 80 90 79 89 40 40 50 50
stt 80 90 79 88 50 50 50 50

Sju watches warnings advisories
Pr... High rip current risk until 6 am ast Saturday for culebra-north
central-northeast-northwest-san juan and vicinity-vieques-
western interior.

Small craft advisory from 2 am to 8 pm ast Saturday for
southeast.

Vi... High rip current risk until 6 am ast Saturday for st croix.

Small craft advisory until 2 pm ast Saturday for st.Thomas... St.

John... And adjacent islands.

Am... Small craft advisory from 2 am to 8 pm ast Saturday for coastal
waters of northwestern puerto rico out 10 nm-coastal waters
of southwestern puerto rico out 10 nm-coastal waters of
northern puerto rico out 10 nm-coastal waters of southern
puerto rico out 10 nm.

Small craft advisory until 2 am ast Sunday for caribbean waters
of puerto rico from 10 nm to 17n.

Small craft advisory until 2 pm ast Saturday for anegada passage
southward to 17n-coastal waters of southern usvi vieques
and eastern puerto rico out 10 nm.

Small craft advisory until 8 am ast Monday for atlantic waters
of puerto rico and usvi from 10 nm to 19.5n.

Small craft advisory from 2 am to 2 pm ast Saturday for coastal
waters of northern usvi and culebra out 10 nm.

Small craft advisory from 2 am Saturday to 2 am ast Sunday for
mona passage southward to 17n.

Short term... Jf
long term... .99


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SJNP4 - 9755371 - San Juan, PR 11 mi40 min E 15 G 17 84°F 85°F1014.5 hPa (+0.5)
41053 - San Juan, PR 12 mi40 min ENE 18 G 21 84°F 84°F5 ft1013.7 hPa (+0.6)
JOXP4 - Jobos Bay Reserve, Puerto Rico 25 mi55 min NNE 5.1 82°F 1014 hPa72°F
YABP4 - 9754228 - Yabucoa Harbor, PR 25 mi40 min N 1.9 G 6 84°F
FRDP4 - 9753216 - Fajardo, PR 29 mi40 min NE 16 G 20 83°F 76°F
AROP4 - 9757809 - Arecibo, PR 30 mi40 min ENE 11 G 17
42085 - Southeast of Ponce, PR 36 mi40 min NE 12 G 16 85°F 85°F1012.4 hPa (+0.9)
41056 38 mi40 min ENE 18 G 21 84°F 4 ft1013.8 hPa (+0.6)
VQSP4 - 9752619 - Isabel Segunda, Vieques, PR 40 mi40 min E 8.9 G 17 83°F
ESPP4 - 9752695 - Esperanza, PR 40 mi40 min E 2.9 G 9.9 82°F 85°F1013.8 hPa
CLBP4 - 9752235 - Culebra, PR 47 mi40 min 83°F 85°F1013.8 hPa (+0.3)

Wind History for San Juan, PR
(wind in knots)    EDIT      (on/off)   Help
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G22
E8
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G23
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G26
E18
G24

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Juan, Luis Munoz Marin International Airport, PR13 mi44 minENE 1210.00 miPartly Cloudy84°F75°F77%1014.2 hPa

Wind History from JSJ (wind in knots)
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Last 24hrCalmS3E7CalmSE3E3SE4SE5SE5E11E18
G23
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G22
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1 day agoE13E14E20
G29
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2 days agoE10E11E9E7E10E10NE12NE14NE12
G18
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G20
NE13NE8E14NE14
G21
NE16
G21
NE13E11E15E14E15E11

Tide / Current Tables for San Juan, La Puntilla, San Juan Bay, Puerto Rico
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San Juan
Click for Map
Fri -- 12:10 AM AST     0.62 feet Low Tide
Fri -- 02:48 AM AST     Moonrise
Fri -- 04:55 AM AST     1.13 feet High Tide
Fri -- 06:06 AM AST     Sunrise
Fri -- 11:21 AM AST     -0.12 feet Low Tide
Fri -- 04:12 PM AST     Moonset
Fri -- 06:40 PM AST     1.91 feet High Tide
Fri -- 06:49 PM AST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.60.70.80.91.11.11.10.90.60.30-0.1-0.10.10.50.91.31.71.91.91.81.51.20.9

Tide / Current Tables for San Juan, Puerto Rico
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San Juan
Click for Map
Fri -- 12:09 AM AST     0.63 feet Low Tide
Fri -- 02:48 AM AST     Moonrise
Fri -- 04:55 AM AST     1.14 feet High Tide
Fri -- 06:06 AM AST     Sunrise
Fri -- 11:21 AM AST     -0.11 feet Low Tide
Fri -- 04:12 PM AST     Moonset
Fri -- 06:40 PM AST     1.92 feet High Tide
Fri -- 06:49 PM AST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.60.70.811.11.11.10.90.60.30-0.1-0.10.10.50.91.31.71.91.91.81.51.20.9

Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
carb_satellite

GOES Local Image of Puerto Rico    EDIT
Geos

Wind Forecast for (23,6,7,8)
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Ground Weather Radar Station Puerto Rico,Virgin Islands
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weather_mapweather_map weather_map

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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.