Marine Weather and Tides
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 5:52AM||Sunset 7:07PM||Thursday June 22, 2017 2:29 PM AST (18:29 UTC)||Moonrise 4:23AM||Moonset 5:40PM||Illumination 2%|
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|AMZ735 Coastal Waters Of Southern Puerto Rico Out 10 Nm- 1032 Am Ast Thu Jun 22 2017 |
.small craft should exercise caution...
Rest of today..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated showers.
Tonight..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated showers through the night.
Friday..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated showers through the day.
Friday night..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated showers.
Saturday..East winds 15 to 20 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 7 seconds. Isolated Thunderstorms, then isolated showers.
Sunday..East winds 15 to 20 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Scattered showers. Isolated Thunderstorms.
Monday..East winds 10 to 15 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated Thunderstorms. Scattered showers.
|AMZ700 1032 Am Ast Thu Jun 22 2017 |
Synopsis for puerto rico and the uS. Virgin islands waters... Strong high pressure ridge across the central atlantic will maintain moderate to locally fresh trade winds across the regional waters through at least next week. A tropical wave will move across the eastern caribbean on Sunday. Hazy skies due to saharan dust expected early next week.
7 Day Forecast for Marine Location Near Tallaboa, PRHourly EDIT Help
Area Discussion for - San Juan, PR  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxca62 tjsj 221523|
area forecast discussion
national weather service san juan pr
1123 am ast Thu jun 22 2017
Update Isolated to scattered shower were observed in the
morning hours across the local waters, eastern pr and the usvi.
These showers left minimal amounts of rain. As the morning
progressed, the shower dissipated, and now we only have some
isolated showers over the waters. Latest satellite imagery
indicates that some cloudiness is developing over pr due to local
effects as well as some just down from the usvi. This is
suggestive of the possibility of showers downwind from the
outlying islands and local mountains and well as across areas of
sea breeze convergence. For that reason the ongoing forecast is
for showers and isolated thunderstorms to develop across the
southwestern quadrant of pr this afternoon.
Aviation Vfr conds expected across the local terminals throught
the forecast period. Vcts expected at tjmz after 22 17z and
posible for tjps due to shra tsra development across western and
southern pr. Winds will remain from the ene at around 15 kt with
sea breeze variations.
Marine Small craft should exercise caution due to seas of up
to 6 feet and winds up to 20 knots. Moderate risk of rip currents
across most of the local beaches in pr and the usvi.
Prev discussion issued 447 am ast Thu jun 22 2017
synopsis... Upper level ridge will continue through Friday. Trough
pattern aloft expected on Saturday as tutt low meanders northeast
of the region through midweek next week. Moisture increases on
Sunday with the arrival of a tropical wave. Saharan air layer
expected by early next week. Another tropical wave is forecast to
reach the area next Thursday. A broad surface high pressure will
continue across the central atlantic promoting moderate to locally
fresh trade winds.
Short term... Thursday through Saturday...
a mid to upper level ridge will continue to prevail across the local
isles through Friday. This feature is expected to erode during the
upcoming weekend as an upper trough develops northeast of the
forecast area over the central atlantic. The ridge pattern aloft
will result in a sharp decrease in available moisture during the
next two days or so. In fact, latest guidance continues to indicate
precipitable water values well below the normal range on Friday. At
lower levels, a broad high pressure will continue to prevail across
the central atlantic during the forecast period to yield a moderate
to fresh easterly wind flow.
As a result, a few showers embedded in the wind flow are still
expected across the windward areas this morning. Although the ridge
aloft will continue to hold through much of the forecast period and
moisture is expected to decrease through Friday, locally induced
afternoon showers and thunderstorms are still expected across
southwest puerto rico this afternoon. A fair and stable weather
pattern is expected on Friday with limited shower thunder activity.
Locally induced afternoon showers and thunderstorms are once again
expected on Saturday.
Long term... Sunday through Friday...
tutt low northeast of the region will create a trof pattern across
the northeastern caribbean and over the islands through the long
range period. A tropical wave is forecast to reach the local
islands late Sunday early Monday increasing tropical moisture
across the area. Upper level support from the the tutt trof
pattern aloft will further increase convective development across
the mountain ranges and western sections of pr. Saharan air layer
is forecast to reach the region by early next week after the
passage of the tropical wave. Resulting in hazy skies. However,
diurnally induced afternoon showers and isolated thunderstorms
are expected each day. A second tropical wave is forecast to reach
the region by next Thursday.
Aviation...VFR conds are expected to prevail at all TAF sites with
vcsh possible at the leeward and usvi terminals as well as jsj early
in the morning. Aft 22 16z shra tsra expected near jmz with MVFR
conds possible through 22 22z. Ene winds at 15-20 knots aft 22 13z.
Marine... Small crafts should exercise caution today due to winds
up to 20 knots and or seas up to 6 feet across much of the
regional waters. Relative tranquil seas are expected after today
and seas should stay below small craft advisory criteria for the
next 7 days. Moderate risk of rip currents will continue across
the islands through the weekend.
Preliminary point temps pops
Sju 88 78 89 77 30 20 20 30
stt 90 79 89 78 30 20 20 50
Sju watches warnings advisories
Short term... Ja
long term... .99
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|
|MGIP4 - 9759110 - Magueyes Islands, PR||15 mi||42 min||SSE 7 G 13||86°F||83°F||1014.6 hPa|
|42085 - Southeast of Ponce, PR||15 mi||60 min||ESE 19 G 25||84°F||1013.7 hPa|
|MGZP4 - 9759394 - Mayaguez, PR||27 mi||42 min||WSW 9.9 G 13|
|JOXP4 - Jobos Bay Reserve, Puerto Rico||29 mi||105 min||E 9.9||88°F||1016 hPa||71°F|
|AROP4 - 9757809 - Arecibo, PR||35 mi||42 min||ENE 8.9 G 14|
|PTRP4||37 mi||25 min||NE 9.9 G 18||87°F|
|41115 - Rincon, Puerto Rico (181)||39 mi||37 min||84°F||3 ft|
|SJNP4 - 9755371 - San Juan, PR||48 mi||42 min||NE 13 G 18|
|YABP4 - 9754228 - Yabucoa Harbor, PR||49 mi||42 min||ENE 7 G 16||88°F|
|41053 - San Juan, PR||49 mi||60 min||ENE 14 G 16||83°F||1015.6 hPa|
Wind History for Penuelas (Punta Guayanilla), PR(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
Wind History from JPS (wind in knots)
|1 day ago||NE||E||NE||NE||NE|
|2 days ago||E||NE||NE||NE|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Punta Guayanilla |
Click for Map
Thu -- 04:23 AM AST Moonrise
Thu -- 05:52 AM AST Sunrise
Thu -- 11:26 AM AST -0.16 feet Low Tide
Thu -- 05:40 PM AST Moonset
Thu -- 07:05 PM AST Sunset
Thu -- 10:39 PM AST 0.83 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
Click for Map
Thu -- 04:24 AM AST Moonrise
Thu -- 05:53 AM AST Sunrise
Thu -- 11:42 AM AST -0.19 feet Low Tide
Thu -- 05:40 PM AST Moonset
Thu -- 07:06 PM AST Sunset
Thu -- 08:45 PM AST 0.79 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Weather Map and Satellite Images(on/off)  Help
|Weather Map ||IR Satellite Image from GEOS|
GOES Local Image of Puerto Rico EDIT
Wind Forecast for (14,3,4,5)(on/off)  Help
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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.