Marine Weather and Tides
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 6:31AM||Sunset 5:47PM||Sunday November 19, 2017 4:51 AM AST (08:51 UTC)||Moonrise 7:23AM||Moonset 6:55PM||Illumination 0%|
EDIT (on/off)  Help
|AMZ712 Coastal Waters Of Northern Puerto Rico Out 10 Nm- 450 Am Ast Sun Nov 19 2017 |
Today..South winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 10 seconds. North swell around 4 feet. Scattered showers and isolated Thunderstorms.
Tonight..South winds 5 to 10 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. North swell around 4 feet. Scattered showers.
Monday..Southwest winds 5 to 10 knots backing northeast in the afternoon. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. North swell around 4 feet. Numerous showers and isolated Thunderstorms.
Monday night..Southeast winds 5 to 10 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 9 seconds. Northeast swell around 4 feet in the evening. Isolated showers.
Tuesday..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 8 seconds. Isolated showers.
Wednesday..East winds 5 to 10 knots. Seas 2 to 4 feet with occasional seas up to 5 feet. Dominant period 7 seconds. Isolated showers.
Thursday..East winds 5 to 10 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. Northeast swell 4 to 5 feet. Isolated showers.
|AMZ700 450 Am Ast Sun Nov 19 2017 |
Synopsis for puerto rico and the uS. Virgin islands waters... A frontal boundary and associated moisture will continue to linger across the local atlantic waters throughout the day. This will result in periods of showers and Thunderstorms. Easterly winds and a more stable air mass are expected across the local waters on Tuesday.
7 Day Forecast for Marine Location Near Carolina, PRHourly EDIT Help
Area Discussion for - San Juan, PR  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxca62 tjsj 190025|
area forecast discussion
national weather service san juan pr
825 pm ast Sat nov 18 2017
Update Numerous showers and thunderstorms developed
this afternoon and evening mostly along and north of cordillera
central of puerto rico. Several flood advisories and a flash flood
warning were issued for numerous municipalities along and north of
cordillera central of puerto rico as well as for the u.S. Virgin
islands. This activity was associated with moisture provided by a
frontal boundary to the west and north of the region. An unsettled
and rainy weather pattern is expected to continue tonight and on
Sunday as the frontal boundary remains close to the region,
keeping the local islands under higher than normal moisture.
Cloudy skies and periods of showers and possible isolated
thunderstorms are forecast through the rest of the weekend and
early next week. Urban and small stream flooding and flash flood
warning are possible especially on Sunday afternoon.
Aviation Shra tsra expected to continue across the local area
tonight, causing vcsh vcts across the local terminals with tempo
MVFR conds possible at tjbq, tjsj as well as across the usvi TAF sites.
Cigs will be mainly above fl120 before 19 14z. CIGS are expected
at fl050 and at times close to fl030 with shra tsra after 19 16z.
Winds will be mainly southwesterly overnight generally at 10kt or
Marine Not changes to previous reasoning
Prev discussion issued 816 pm ast Sat nov 18 2017
a weak frontal boundary is causing showers and thunderstorms
across puerto rico and the u.S. Virgin islands. The heaviest rain
is currently over the st. Thomas and the u.S virgin islands, but
doppler radar and satellite imagery is showing deep convection
beginning to form over the central interior and northeast puerto
rico. Mostly cloudy conditions helped keep wide spread convection
from firing early today due to surface heating being limited
during the morning and afternoon. Otherwise, deep tropical
moisture will continue to be drawn over the forecast area through
Sunday thus causing showers and thunderstorms.
Short term... Tonight thru Monday
a front that has bought unsettled weather to puerto rico and the
u.S. Virgin islands remains to the west of the island. This front
is pulling moist tropical air across the region and causing
showers and thunderstorms. Over the next several hours the
strongest showers and thunderstorms will be over the interior,|
northeast, vieques, st. Thomas and st. Croix, but other areas
could see showers develop.The combination of a weak frontal
boundary, an induced surface trough, a southerly wind flow and
good ventilation aloft will help in the development of showers and
thunderstorms through Sunday. The only limiting factor at this
time is cloud cover not allowing enough heating at the surface to
trigger showers and thunderstorms Sunday.
Long term... Tuesday through Sunday... (previous discussion)
as a mid to upper level ridge strengthens across the forecast
area early the next work week, available moisture will quickly
erode with precipitable water values remaining near the normal
range through the forecast period. Under the ridge aloft and
easterly winds bringing those patches of low level moisture at
times, expect mainly fair and stable weather condition much of the
next work week with trade wind showers across usvi and E pr as
well as some locally induced afternoon showers across west areas
of puerto rico each day. Seasonable temperatures are also expected
as easterly winds will return to the area.
shra tsra will continue across the flying area through the
overnight hours. Vcsh vcts across the local terminals with tempo
MVFR conds at tjsj tist tjps tisx tjbq til 18 22z. Bkn ovc are
likely and will be mainly above fl050 but in near shra tsra could
be near fl030. In addition with this activity expect vis around
4sm. Sfc winds from the SW btwn 6-12 kt but gusty and vrb near
tsra, then light to calm and vrb aft 18 23z.
Marine... Seas 3 to 5 feet with occasionally seas up to 6 feet are
expected across the atlantic waters due to small northerly swell.
Elsewhere seas of 2 to 4 feet. Wind direction will vary over the
local waters but generally at 10 knots or less. A moderate risk
of rip currents is expected across the north beaches of puerto
rico and culebra.
Preliminary point temps pops
Sju 78 86 77 86 50 50 30 30
stt 78 86 78 85 40 40 40 40
Sju watches warnings advisories
Pr... Flash flood watch through Sunday afternoon for northwest-western
Short term... Jf
long term... .Tw
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|
|41053 - San Juan, PR||6 mi||52 min||W 1.9 G 3.9||78°F||83°F||4 ft||1008.1 hPa (-0.8)|
|41056||31 mi||52 min||SW 3.9 G 5.8||80°F||3 ft||1008.7 hPa (-0.9)|
Wind History for San Juan, PR(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
Click EDIT to select an airport
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Boca De Cangrejos |
Click for Map
Sun -- 03:14 AM AST -0.05 feet Low Tide
Sun -- 06:32 AM AST Sunrise
Sun -- 07:22 AM AST Moonrise
Sun -- 10:20 AM AST 1.51 feet High Tide
Sun -- 04:54 PM AST 0.38 feet Low Tide
Sun -- 05:45 PM AST Sunset
Sun -- 06:54 PM AST Moonset
Sun -- 09:45 PM AST 0.83 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|San Juan |
Click for Map
Sun -- 02:43 AM AST 0.05 feet Low Tide
Sun -- 06:33 AM AST Sunrise
Sun -- 07:22 AM AST Moonrise
Sun -- 09:52 AM AST 1.78 feet High Tide
Sun -- 04:30 PM AST 0.50 feet Low Tide
Sun -- 05:46 PM AST Sunset
Sun -- 06:55 PM AST Moonset
Sun -- 09:16 PM AST 0.98 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 (3,6,7,8)(on/off)  Help
Ad by Google
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.