Marine Weather and Tides
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen
|Sunrise 6:05AM||Sunset 6:43PM||Sunday August 25, 2019 7:01 AM AST (11:01 UTC)||Moonrise 1:02AM||Moonset 2:30PM||Illumination 26%|
7 Day Forecast for Marine Location Near Esperanza, PRHourly EDIT Help
Area Discussion for - San Juan, PR  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxca62 tjsj 250918|
area forecast discussion
national weather service san juan pr
518 am ast Sun aug 25 2019
A dry air mass with saharan dust particles will result in hazy
skies today through Tuesday. Tropical cyclone dorian it's
forecast to cross the lesser antilles Tuesday night and moving
close to our local region next Wednesday. There is still
uncertainty on the forecast. Therefore, the impacts of dorian
will be linked to the final track and intensity of the tropical
Short term Today through Tuesday...
a few passing showers were observed across portions of eastern
puerto rico as well as the local and regional waters. This activity
is a result of lingering moisture from the departed tropical wave
and an easterly wind surge. The light showers are expected to
continue through this afternoon before a dry saharan air mass
filters into the u.S. Virgin islands and eastern puerto rico. This
dry saharan air mass will continue to seep into other areas of the
island throughout the afternoon.
The precipitable water value is a good indicator of how much
moisture is over the area. Last night tjsj 00z sounding had a
precipitable water value of 1.87 inches, and the GFS model tjsj
sounding at 18z today shows the value diminishing to 1.28 inches. The
precipitable water value of 1.28 inches this afternoon ranks 2
standard deviations below normal. The GFS shows precipitable water
values remaining 2 standard deviations below normal through Tuesday.
The high-res WRF model shows limited shower activity through
Tuesday, as a result of, a dry stable air mass. Therefore expect
fair weather with hazy skies to prevail through Tuesday with limited
shower activity across the adjacent islands and puerto rico.
However, development of a few showers can't be ruled out, as a
result of, diurnal heating and local effects during the afternoons
mainly over the interior and western areas of puerto rico.
Temperatures over the next several days will be near the upper 80s
to the lower 90s in lower elevations, and the lower to middle 80s in
Long term Wednesday through Sunday...
according to the national hurricane center forecast, tropical
cyclone dorian will move as a cat-1 hurricane across the local
archipelago Wednesday through Thursday. At this time, there is|
plenty of uncertainty regarding the intensity and track of dorian.
Therefore, it's too soon to determine the timing and magnitude of
the impacts in the u.S. Virgin islands and puerto rico. Those in
the region should monitor the evolution of this system for
further updates as it approaches.
Another tropical wave is forecast to reach the local islands
Saturday evening or Sunday. Although is to early to determine the
magnitude of this wave, model guidance does appear to suggest
unsettled weather conditions with widespread rains and
MainlyVFR conditions are expected to persist through the forecast
period. Shra could develop across terminals tjbq an tjmz by 25 18z
with the activity clearing out by 26 02z. Hz skies across the usvi
and pr eastern terminals by 25 15z. Ese wind ranging from 10 to 15
kts with higher gusts today.
Marine Seas up to 5 feet and winds around 15 knots are
expected across the local waters through much of the forecast
period. Local effects will increase winds around 20 knots across
the coastal waters of northern and southern puerto rico during the
afternoon hours, where mariners should exercise caution.
According to the official NHC forecast, dorian will deteriorate
the marine conditions Wednesday through at least Thursday across
the local waters.
For the beach goers, there is a moderate risk of rip current for
most of the local beaches of puerto rico and the southern u.S.
Virgin islands today.
Preliminary point temps pops
Sju 91 81 90 79 20 20 20 20
stt 90 81 90 79 20 20 20 20
Sju watches warnings advisories
Short term... Tw
long term... .Cam
Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
|Stations||Dist||Age||Wind||Air Temp||Water Temp||Waves||Pressure||DewPt|
|ESPP4 - 9752695 - Esperanza, PR||2 mi||43 min||ESE 9.9 G 14||85°F||83°F||1016.5 hPa|
|41056||10 mi||61 min||ESE 14 G 18||84°F||85°F||3 ft||1016 hPa (-0.0)|
|CLBP4 - 9752235 - Culebra, PR||15 mi||49 min||83°F||86°F||1016.5 hPa|
|YABP4 - 9754228 - Yabucoa Harbor, PR||20 mi||43 min||86°F||77°F|
|CHAV3 - 9751639 - Charlotte Amalie, VI||32 mi||49 min||82°F||1016.5 hPa|
|41052 - South of St. John, Virgin Islands||38 mi||31 min||E 14 G 16||85°F||1015.1 hPa|
|LAMV3||41 mi||43 min||82°F||84°F|
|41053 - San Juan, PR||42 mi||61 min||ESE 9.7 G 14||83°F||84°F||3 ft||1015.2 hPa (-0.0)|
|JOXP4 - Jobos Bay Reserve, Puerto Rico||42 mi||76 min||NE 1.9||79°F||1017 hPa||75°F|
|SJNP4 - 9755371 - San Juan, PR||42 mi||43 min||ESE 5.1 G 6||82°F||84°F||1016.6 hPa|
|CHSV3 - 9751364 - Christiansted Harbor, Virgin Islands||48 mi||49 min||E 1.9 G 4.1||81°F||85°F||1016.1 hPa|
|LTBV3 - 9751401 - Lime Tree Bay, VI||48 mi||43 min||SE 8 G 15||84°F||86°F||1016.6 hPa|
Wind History for Isabel Segunda, Vieques Island, PR(wind in knots) EDIT (on/off)  Help
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GOES Local Image of Puerto Rico 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 (7,2,3,4)(on/off)  Help
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