Friday, September21, 2018 L-36.com


Marine Weather and Tides
Lomas, PR

Version 3.4
What's New / NOTES
9/17/2018 XTide broke when 1and1 "upgraded" my server. It has been esculated. I am sorry for the problem.

Sunrise 6:11AMSunset 6:21PM Friday September 21, 2018 11:22 AM AST (15:22 UTC) Moonrise 4:22PMMoonset 3:12AM Illumination 89% Phase: Waxing Gibbous; Moon at 12 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- 1007 Am Ast Fri Sep 21 2018
Rest of today..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Isolated showers.
Tonight..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Scattered showers.
Saturday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Scattered showers.
Saturday night..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. Northwest swell around 4 feet after midnight. Isolated showers.
Sunday..East winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 11 seconds. Northeast swell 4 to 5 feet. Isolated Thunderstorms. Scattered showers.
Monday..East winds 15 to 20 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 11 seconds. Northeast swell 4 to 5 feet. Isolated showers.
Tuesday..East winds 10 to 15 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 12 seconds. Northeast swell 4 to 5 feet. Scattered showers and isolated Thunderstorms.
AMZ700 1007 Am Ast Fri Sep 21 2018
Synopsis for puerto rico and the uS. Virgin islands waters... A moderate to locally fresh easterly wind flow will prevail across the local waters today, becoming gentle to moderate during the upcoming weekend. Hazy skies are still expected today. A northerly swell will move into the northern outer atlantic waters Saturday night, then spread across the rest of the atlantic waters and local passages over the rest of the weekend into early next week. The next tropical wave is forecast to approach the regional waters by early next week.


7 Day Forecast for Marine Location Near Lomas, PR
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location: 18.28, -65.93     debug


Area Discussion for - San Juan, PR
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Fxca62 tjsj 211457
afdsju
area forecast discussion
national weather service san juan pr
1057 am ast Fri sep 21 2018

Update Mostly fair weather skies and hazy conditions expected
to continued across most of the region into the evening hours.

A few locally and diurnally induced afternoon showers will remain
possible over parts of central and west to southwest pr. Activity
will quickly diminish around sunset. Recent tjsj 21 12z upper air
sounding was considerably drier today with pwat values down to 1.24
inches, suggesting an overall dry and stable sal airmass. Aerosol
products and recent satellite imagery both suggest that the suspended
saharan dust particulates spread across the region is to gradually
diminish during the rest of the day and overnight. Any shower activity
across the islands should diminish around sunset leaving partly cloudy
to mostly clear skies. Limited passing showers expected across the
coastal waters and windward side of the islands during the overnight
and early morning hours. No changes made to the inherited forecast
package and reasoning at this time.

Aviation update Vfr durg entire prd. No chg to previous avn
discussion. Suspended dust particulates mainly btw fl050-fl150
across local flying area with hz alqds... But no restrictions
to flt vis. Sfc vsby 5-6sm some local terminals. Few clds nr
fl030... Fl050. Sfc wnds e-ne 10-15 kts with ocnl hir gusts and
local sea breeze variations.

Marine update Winds 10-15 kts and seas 3-5 feet will continue
through Saturday. A northerly swell still forecast to move into
the outer atlantic waters by Saturday night, then spread across
the rest of the atlantic waters and local passages over the rest
of the weekend into early next week.

Prev discussion issued 515 am ast Fri sep 21 2018
synopsis... A generally fair and stable weather pattern with hazy
skies is expected to prevail today. As the ridge pattern aloft
weakens, the chance for showers and thunderstorms will increase
early next week.

Short term... Today through Sunday...

recent satellite imagery shows a patch of low level moisture just
east of the leeward islands. This moisture will continue to move
to the west and could cause showers across the u.S virgin islands
and eastern areas of puerto rico this morning. Dry saharan air
mass will continue to prevail over the region and cause hazy milky
skies today. Analysis of the recent skew-t shows a plethora of
dry air from 700 to 500 mb today, this will limit the development
of showers and thunderstorms today across the area. If showers do
develop today they will be short-lived as a result of limited
moisture and subsidence provided by the high pressures systems.

This drier at the mid to upper levels of the atmosphere is
forecast to remain through late Sunday. Rh values at 500 to 250 mb
will range from 20 to 40 percent, but from 1000 to 850 mb rh
values will range from 60 to 80 percent starting on Saturday. An
increase in low level moisture is forecast on Saturday as moisture
moves in from the eastern caribbean and north atlantic as a upper
level trough deepens to the northeast of the leeward islands.

This combined with diurnal heat could cause scattered showers
across the area through Sunday.

Otherwise, pleasant warm weather is expected with temperatures in
the upper 80s to lower 90s with easterly winds of 10 to 15 mph with
higher gusts possible.

Long term... Monday through Sunday
a weak mid level ridge will hold much of the week, eroding by the
end of the cycle as a mid to upper level trough establishes west of
the forecast area. At lower levels, easterly winds will prevail
through the end of the week with an induced surface trough moving
across the eastern caribbean sat-sun. Although trade winds will
continue to bring patches of moisture at times, the best moisture
advection - near or exceeding precipitable water values of 2
inches - is anticipate tue-wed as well as sat-sun.

Based on NHC guidance, there is a small but concentrated area of
showers and thunderstorms which is located 650 miles east of the
windward islands with 10 percent of formation chance through 5
days.

Under the aforementioned pattern, expect seasonal weather early
the next week with the chance for organized convection increasing
tue-wed. A wetter and unsettled weather pattern is then on tap
sat-sun.

Aviation...VFR conds fcst to prevail through 22 00z across all
terminal sites. Hz skies due to the saharan dust will also continue
today across all of puerto rico. These conds could cause reduced
vsby's through 22 00z. Sfc winds will be out of the east to
northeast at 10 to 15 kts with higher gusts possible.

Marine... Seas 4 to 6 feet across the caribbean offshore waters
as well as the mona passage. Elsewhere, 5 feet or less are expected.

A moderate to locally fresh easterly wind flow will prevail
across the local waters today, becoming gentle to moderate during
the upcoming weekend. The chance for showers and thunderstorms
across the local waters is expected to increase early next week. A
northerly swell will move into the northern outer atlantic waters
Saturday night.

Preliminary point temps pops
Sju 90 79 89 78 40 40 40 40
stt 90 80 90 79 40 40 40 20

Sju watches warnings advisories
Pr... None.

Vi... None.

Am... None.

Short term... Ram
long term... .Ram


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
41053 - San Juan, PR 16 mi53 min E 14 G 18 84°F 1015.6 hPa
SJNP4 - 9755371 - San Juan, PR 16 mi41 min 84°F 84°F1016.2 hPa
YABP4 - 9754228 - Yabucoa Harbor, PR 16 mi35 min 89°F 74°F
41056 25 mi53 min NE 12 G 14 84°F 1015.1 hPa
JOXP4 - Jobos Bay Reserve, Puerto Rico 27 mi98 min ENE 5.1 88°F 1016 hPa73°F
ESPP4 - 9752695 - Esperanza, PR 28 mi41 min 87°F 84°F1015.4 hPa
CLBP4 - 9752235 - Culebra, PR 33 mi41 min 87°F 85°F1015.9 hPa
42085 - Southeast of Ponce, PR 43 mi83 min E 14 G 18 89°F 85°F1014.5 hPa (+0.8)
AROP4 - 9757809 - Arecibo, PR 43 mi65 min ENE 7 G 12

Wind History for Fajardo, PR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Juan, Luis Munoz Marin International Airport, PR11 mi87 minENE 12 G 186.00 miPartly Cloudy with Haze86°F73°F67%1016 hPa

Wind History from JSJ (wind in knots)
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Last 24hrSE10
G15
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E12E12E8E6E7SE3SE4SE3SE3SE3CalmCalmCalmCalmCalmE4E12
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1 day agoE13
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E14E14E13E14E12E13E11E9E9E8E9E7E5SE3CalmS3CalmCalmS34E7SE9E10
2 days agoE11E13E16E13E8E10E12E8E7E5E5E7E5E5E4CalmSE3E5SE3SE3E8E14E8E12

Tide / Current Tables for Boca De Cangrejos, Isla Verde, San Juan, Puerto Rico
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Vieques Passage, Puerto Rico Current
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Tide / Current data from XTide NOT FOR NAVIGATION
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Weather Map and Satellite Images
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wmap_A
GOES Local Image of    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (11,2,3,4)
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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.