Friday, August18, 2017 L-36.com


Marine Weather and Tides
Emajagua, 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 6:05AMSunset 6:48PM Friday August 18, 2017 12:21 PM AST (16:21 UTC) Moonrise 2:47AMMoonset 4:11PM Illumination 14% 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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AMZ735 Coastal Waters Of Southern Puerto Rico Out 10 Nm- 1030 Am Ast Fri Aug 18 2017
.small craft should exercise caution...
.small craft advisory in effect from late tonight through Saturday evening...
Rest of today..East winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 7 seconds. Isolated showers through the day.
Tonight..Northeast winds 15 to 20 knots. Seas 6 to 8 feet with occasional seas up to 10 feet. Dominant period 7 seconds. Southeast swell around 4 feet after midnight. Isolated showers through the night.
Saturday..East winds 15 to 20 knots. Seas 6 to 8 feet with occasional seas up to 10 feet. Dominant period 10 seconds. East swell around 4 feet. Scattered showers through the day. Isolated Thunderstorms in the afternoon.
Saturday night..East winds 15 to 20 knots. Seas 6 to 8 feet with occasional seas up to 10 feet. Dominant period 7 seconds. Southeast swell around 4 feet in the evening. Scattered showers in the evening. Isolated Thunderstorms through the night.
Sunday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Isolated Thunderstorms.
Monday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Scattered showers.
Tuesday..Northeast winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 8 seconds. Isolated Thunderstorms. Scattered showers.
AMZ700 1030 Am Ast Fri Aug 18 2017
Synopsis for puerto rico and the uS. Virgin islands waters... Tropical storm harvey is forecast to move westward across the caribbean sea and pass well south of the forecast area late tonight into Saturday. This will result in hazardous seas across the caribbean waters and local passages. An area of low pressure about 750 miles east northeast of the leeward islands will reach the forecast area early next week, regardless development, winds and seas are expected to increase across the offshore atlantic waters Sunday and into early next week.

7 Day Forecast for Marine Location Near Emajagua, PR
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location: 18, -65.88     debug


Area Discussion for - San Juan, PR
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Fxca62 tjsj 181558
afdsju
area forecast discussion
national weather service san juan pr
1158 am ast Fri aug 18 2017

Update Fair weather has been observed through the day across
the local area. Drier air has moved in and only isolated showers
with little to no accumulations are expected for the rest of
today. The latest guidance suggests that maybe western pr may have
some showers in the afternoon but that would also be of short
duration since the winds are moving things quickly to the west to
west southwest. No changes were made to the inherited forecast.

Aviation Vfr conds expected through the forecast period. Winds
will continue from the east to ene at about 15kt. Slight chance of
shra at tjmz after 18 17z could cause vcsh but it should be brief.

Winds to remain at 15kt or so 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 the seas could increase to 9 feet.

Prev discussion issued 520 am ast Fri aug 18 2017
synopsis... Tropical storm harvey is forecast to move westward
across the caribbean sea and pass south of the forecast area late
tonight into Saturday. A generally fair weather pattern is expected
to prevail today with the chance for showers and thunderstorms
increasing across the local isles during the weekend as the peripheral
moisture of TS harvey reaches the forecast area as well as invest
92l likely to move northeast of the area on Sunday.

Short term... Friday through Sunday...

the available moisture is forecast to erode today, as a mid to
upper level ridge builds from the northeast, strengthening the
cap inversion over the region through early Saturday. In addition,
model guidance is indicating the arrival of more saharan dust
particles today. Under the aforementioned weather pattern, little
or no shower activity is expected across the region today. Maximum
temperatures are expected in the low 90s along the coastal areas
and in the mid 80s across the interior sections.

The center of tropical storm harvey is forecast to move well south
of the islands and across the caribbean waters late tonight into
Saturday. Although no direct impact of harvey is expected across
the county warning area, the available moisture is expected to
increase by early Saturday morning. As a result, shower and
thunderstorm activity is expected to increase in frequency and
intensity through Saturday. Soils are already saturated,
especially across east and southeast puerto rico, and any
significant or persistent shower or thunderstorm activity would
lead to flooding or even mud slides during the weekend.

Another area of low pressure, invest 92l, located about 900 miles
east of the leeward islands is forecast to move near the region by
Sunday. Based on the latest information of the nhc, this system
has a 70 percent chance of formation in the next 48 hours and
should move northeast of the islands on Sunday as a tropical wave.

Regardless of the formation of a tropical cyclone, model guidance
suggested a wet pattern across the region. Is important to
monitor the progress of this disturbance.

Long term... Monday through Saturday...

although the aforementioned area of low pressure, invest 92l,
should be located west of the area by Monday, associated moisture
will continue to prevail across the northeast caribbean.

Therefore, the potential for showers and thunderstorms across the
local isles continues.

An overall wet pattern is expected to prevail Tuesday through
Thursday as a broad surface trough develops across the tropical
atlantic and into the northeast caribbean promoting moisture
convergence with pw values near two inches. A drier air mass is
then expected Friday through Sunday.

Aviation...VFR conds with limited shra activity expected across
pr usvi today. A few -shra are expected across tjsj tist tisx at
least until 18 12z, then few or sct ceiling at fl025-fl050 expected
across the terminals in pr usvi. On the other hand, tkpk tncm can
expect passing shra with sct-bkn ceilings at fl018-fl100, as well as
vcts due to the proximity of ts-harvey aft 18 15z. Winds increasing
around 15 kts with occasional higher gusts aft 18z 12z.

Marine... Tropical storm harvey is forecast to move westward
across the caribbean sea and pass south of the forecast area late
tonight into Saturday. This will result in hazardous seas 8 to 10
feet and winds 20 to 25 knots particularly across the caribbean
waters and local passages. An area of low pressure about 900 miles
east of the leeward islands will reach the forecast area early
next week, regardless development, winds and seas are also likely
to increase across the offshore atlantic waters Sunday.

Preliminary point temps pops
Sju 89 80 90 79 20 40 40 50
stt 91 80 90 79 10 50 50 50

Sju watches warnings advisories
Pr... Small craft advisory from midnight tonight to 8 pm ast Saturday
for southeast.

Vi... Small craft advisory until 8 pm ast Saturday for st.Thomas... St.

John... And adjacent islands.

High rip current risk until 6 pm ast this evening for st croix.

Am... Small craft advisory until 8 pm ast Saturday for anegada passage
southward to 17n-caribbean waters of puerto rico from 10 nm
to 17n-coastal waters of southern usvi vieques and eastern
puerto rico out 10 nm.

Small craft advisory from midnight tonight to 8 pm ast Saturday
for coastal waters of northern puerto rico out 10 nm-
coastal waters of northern usvi and culebra out 10 nm-
coastal waters of southern puerto rico out 10 nm-mona
passage southward to 17n.

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

Short term... Ja
long term... .99


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
YABP4 - 9754228 - Yabucoa Harbor, PR 5 mi51 min ENE 2.9 G 9.9 89°F
JOXP4 - Jobos Bay Reserve, Puerto Rico 18 mi96 min ENE 5.1 90°F 1014 hPa74°F
ESPP4 - 9752695 - Esperanza, PR 23 mi51 min ESE 8 G 14 86°F 84°F1013.5 hPa
VQSP4 - 9752619 - Isabel Segunda, Vieques, PR 25 mi51 min E 7 G 12 87°F
FRDP4 - 9753216 - Fajardo, PR 27 mi51 min ENE 11 G 13 84°F 75°F
41056 29 mi51 min ENE 14 G 16 84°F 1013.5 hPa
SJNP4 - 9755371 - San Juan, PR 34 mi51 min E 14 G 18 85°F 84°F1014.1 hPa
42085 - Southeast of Ponce, PR 35 mi51 min E 16 G 19 86°F 1012.2 hPa
41053 - San Juan, PR 35 mi51 min ENE 14 G 16 84°F 1013.4 hPa
CLBP4 - 9752235 - Culebra, PR 37 mi51 min 88°F 85°F1013.5 hPa

Wind History for Yabucoa Harbor, PR
(wind in knots)    EDIT      (on/off)   Help
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NE4
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E8
G14
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G22
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G14

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Juan, Luis Munoz Marin International Airport, PR30 mi85 minE 159.00 miPartly Cloudy88°F75°F66%1014.2 hPa

Wind History from JSJ (wind in knots)
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Last 24hrSE6SE7E10
G14
E13E10E9E7SE4E3E3SE4CalmS3E7CalmSE3E3SE4SE5SE5E11E18
G23
E15E15
1 day agoNE13NE8E14NE14
G21
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NE13E11E15E14E15E11E13E14E20
G29
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2 days agoE13E18E17
G22
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G18
E12E12E10E11E9E7E10E10NE12NE14NE12
G18
NE12NE18
G23
NE15
G22
NE11
G20

Tide / Current Tables for Puerto Maunabo, Puerto Rico
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Puerto Maunabo
Click for Map
Fri -- 02:48 AM AST     Moonrise
Fri -- 06:06 AM AST     Sunrise
Fri -- 11:09 AM AST     0.07 feet Low Tide
Fri -- 04:10 PM AST     Moonset
Fri -- 06:47 PM AST     Sunset
Fri -- 07:59 PM AST     0.93 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.70.60.50.40.30.30.20.20.10.10.10.10.10.10.20.40.50.70.80.90.90.90.90.8

Tide / Current Tables for Vieques Passage, Puerto Rico Current
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Vieques Passage
Click for Map
Fri -- 01:45 AM AST     -0.88 knots Max Ebb
Fri -- 02:46 AM AST     Moonrise
Fri -- 05:31 AM AST     0.00 knots Slack
Fri -- 06:05 AM AST     Sunrise
Fri -- 08:00 AM AST     0.43 knots Max Flood
Fri -- 10:38 AM AST     -0.00 knots Slack
Fri -- 01:38 PM AST     -0.53 knots Max Ebb
Fri -- 04:10 PM AST     Moonset
Fri -- 04:22 PM AST     0.00 knots Slack
Fri -- 06:46 PM AST     Sunset
Fri -- 07:57 PM AST     0.85 knots Max Flood
Fri -- 11:16 PM AST     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.6-0.8-0.9-0.7-0.5-0.20.10.40.40.40.2-0.1-0.3-0.5-0.5-0.4-0.10.20.50.80.90.80.50.1

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 (12,3,4,5)
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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.