Thursday, August17, 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 6:49PM Thursday August 17, 2017 11:23 AM AST (15:23 UTC) Moonrise 1:49AMMoonset 3:11PM Illumination 22% Phase: Waning Crescent; Moon at 25 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- 1008 Am Ast Thu Aug 17 2017
.small craft should exercise caution...
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 Thunderstorms late in the morning. Numerous showers through the day.
Tonight..East winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 7 seconds. Isolated showers.
Friday..East winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 7 seconds. Isolated showers.
Friday night..Northeast winds 15 to 20 knots. Seas 5 to 7 feet with occasional seas up to 9 feet. Dominant period 7 seconds. Isolated showers through the night.
Saturday..East winds 20 to 25 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 10 seconds. Southeast swell around 4 feet. Isolated Thunderstorms. Scattered showers.
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..Northeast winds 10 to 15 knots with gusts to around 30 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Scattered showers. Isolated Thunderstorms.
AMZ700 1008 Am Ast Thu Aug 17 2017
Synopsis for puerto rico and the uS. Virgin islands waters... A surface high pressure across the central atlantic will produce moderate to locally fresh easterly winds through the rest of the week. An active tropical wave in the Mona channel will move into hispaniola later today, showers and Thunderstorms will be active across the regional waters. Potential tropical cyclone number 9 is expected to move across the caribbean sea south of the san juan forecast area between Friday and Saturday with increased seas in the caribbean.

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 170930
afdsju
area forecast discussion
national weather service san juan pr
530 am ast Thu aug 17 2017

Synopsis A tropical wave moving across the forecast area
will continue to result in showers and thunderstorms today. Tutt
low will continue west of the forecast area through late tonight
as an upper ridge builds from the north through Saturday. An area
of low pressure about 500 miles east of the lesser antilles is
expected to move across the caribbean sea on Saturday. This will
increase the potential for gusty winds and thunderstorms across
the caribbean waters.

Short term Thursday through Saturday...

unsettle weather conditions will continue to prevail throughout the
day as an upper level trough tutt low interacts with a tropical wave
moving across the local isles. The chance for showers and
thunderstorms -squally weather type- will continue to be high
particularly during the morning hours across the usvi and the
eastern half of puerto rico as well as the local waters. Shower and
thunder development across west puerto rico this afternoon will be
dependent on cloud cover. The potential for urban and small stream
flooding as well as strong gusty winds continues.

A mid to upper level ridge is expected to build across the forecast
area tonight, as the aformentioned trough aloft tutt low shifts
westward. However, the ridge pattern aloft is expected to be short-
lived as trofiness returns to the local isles on Sunday. Therefore,
as the tropical wave moves away later today and an upper level ridge
builds, a fair weather pattern is expected to prevail on Friday. The
chance for showers and thunderstorms will increase once again on
Saturday as invest 91l moves south of the area but peripheral
moisture reaches the forecast area. Based on the NHC forecast,
this area has a formation chance of 60 percent in the next 48
hours. Stay tuned.

Long term Sunday through Thursday...

another area of low pressure, invest 92l, currently has a 50
percent chance of formation through the next 5 days. This system
however is expected to encounter unfavorable upper level winds
and move close or just to the northeast of the islands on Sunday
as a tropical wave. Overall, precipitable water content will
remain high through the first half of next week. As another
tropical wave is forecast to reach the local area on Tuesday.

Aviation MVFR or even ifr conds will remain possible at all taf
sites in shra tsra as a tropical wave and associated moisture moves
across the area. Ese winds 15 to 20 knots with gusts around 35knots.

Wx conditions are expected to improve tonight.

Marine Hazardous seas will continue today across the regional
waters due to seas between 6-8 feet and easterly winds between
15-22 kts. Strong thunderstorms with frequent lightning and gusty
winds are expected today as a tropical wave continues to exit the
local area. There is a high rip current risk for beaches across
the north, east and south coast of pr and st. Croix. Hazardous
seas are expected once again on Saturday morning as a low pressure
area moves across the caribbean sea.

Preliminary point temps pops
Sju 88 80 88 79 70 20 20 40
stt 88 79 92 80 70 30 20 40

Sju watches warnings advisories
Pr... High rip current risk through this afternoon for central
interior-north central-northeast-northwest-san juan and
vicinity-southeast-western interior.

Vi... High rip current risk through this afternoon for st croix.

Am... Small craft advisory until 2 pm ast this afternoon for
caribbean waters of puerto rico from 10 nm to 17n-
mona passage southward to 17n.

Small craft advisory until 8 pm ast this evening for anegada
passage southward to 17n-coastal waters of northern puerto
rico out 10 nm-coastal waters of northern usvi and culebra
out 10 nm-coastal waters of southern usvi vieques and
eastern puerto rico out 10 nm.

Small craft advisory until 2 am ast Friday for atlantic waters
of puerto rico and usvi from 10 nm to 19.5n.

Short term... Om
long term... .Ds


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
YABP4 - 9754228 - Yabucoa Harbor, PR 5 mi53 min NW 1.9 G 2.9 75°F
JOXP4 - Jobos Bay Reserve, Puerto Rico 18 mi98 min NNE 2.9 73°F 1017 hPa73°F
ESPP4 - 9752695 - Esperanza, PR 23 mi53 min SW 9.9 G 17 77°F 84°F1016.6 hPa
VQSP4 - 9752619 - Isabel Segunda, Vieques, PR 25 mi53 min SSE 1.9 G 2.9 76°F
FRDP4 - 9753216 - Fajardo, PR 27 mi53 min S 5.1 G 8 76°F 74°F
41056 29 mi53 min S 3.9 G 5.8 80°F 1016.2 hPa
SJNP4 - 9755371 - San Juan, PR 34 mi53 min SE 12 G 15 79°F 84°F1014.9 hPa
42085 - Southeast of Ponce, PR 35 mi53 min E 21 G 27 81°F 1013.8 hPa
41053 - San Juan, PR 35 mi53 min SE 9.7 G 12 78°F 1014.1 hPa
CLBP4 - 9752235 - Culebra, PR 37 mi53 min 78°F 85°F1016.1 hPa

Wind History for Yabucoa Harbor, PR
(wind in knots)    EDIT      (on/off)   Help
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NE7
G22
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NE5
G10
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G14
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G11
NE6
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NE5
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NE1
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G12
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NE11
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G11

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Juan, Luis Munoz Marin International Airport, PR30 mi27 minSE 66.00 miLight Rain Fog/Mist77°F75°F94%1014.7 hPa

Wind History from JSJ (wind in knots)
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Last 24hrNE11
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NE13NE8E14NE14
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NE13E11E15E14E15E11E13E14E20
G29
SE4E8E6S4E9
G18
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1 day agoE13E13E18E17
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E12E12E10E11E9E7E10E10NE12NE14NE12
G18
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2 days agoE19
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G26
NE16
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E19E16SE6E7E4E3E6E6SE5SE4E6S3E8E7E5E6E11E16E13

Tide / Current Tables for Puerto Maunabo, Puerto Rico
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Puerto Maunabo
Click for Map
Thu -- 01:49 AM AST     Moonrise
Thu -- 06:06 AM AST     Sunrise
Thu -- 10:05 AM AST     0.10 feet Low Tide
Thu -- 03:10 PM AST     Moonset
Thu -- 06:48 PM AST     Sunset
Thu -- 07:27 PM AST     0.92 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.60.50.50.40.30.20.20.20.10.10.10.10.20.20.30.50.60.80.90.90.90.90.80.8

Tide / Current Tables for Vieques Passage, Puerto Rico Current
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Vieques Passage
Click for Map
Thu -- 12:44 AM AST     -0.84 knots Max Ebb
Thu -- 01:47 AM AST     Moonrise
Thu -- 04:30 AM AST     0.00 knots Slack
Thu -- 06:04 AM AST     Sunrise
Thu -- 06:56 AM AST     0.40 knots Max Flood
Thu -- 09:29 AM AST     -0.00 knots Slack
Thu -- 12:32 PM AST     -0.53 knots Max Ebb
Thu -- 03:10 PM AST     Moonset
Thu -- 03:19 PM AST     0.00 knots Slack
Thu -- 06:47 PM AST     Sunset
Thu -- 06:56 PM AST     0.85 knots Max Flood
Thu -- 10:19 PM AST     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.8-0.8-0.7-0.5-0.20.10.30.40.30.1-0.1-0.4-0.5-0.5-0.4-0.10.20.60.80.90.80.50.1-0.3

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 (11,2,3,4)
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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.