Sunday, May26, 2019 L-36.com


Marine Weather and Tides
Cata�o, PR

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 5:46AMSunset 6:56PM Sunday May 26, 2019 10:57 AM AST (14:57 UTC) Moonrise 12:42AMMoonset 12:23PM Illumination 49% Phase: Third Quarter Moon; Moon at 22 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
    EDIT      (on/off)   Help
AMZ712 Coastal Waters Of Northern Puerto Rico Out 10 Nm- 400 Am Ast Sun May 26 2019
Today..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. Scattered showers through the day. Isolated Thunderstorms in the afternoon.
Tonight..East winds 5 to 10 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. Scattered showers.
Monday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. Scattered showers through the day. Isolated Thunderstorms in the afternoon.
Monday night..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 12 seconds. North swell 4 to 5 feet. Isolated Thunderstorms in the evening. Scattered showers through the night.
Tuesday..Southeast winds 10 to 15 knots. Seas 4 to 6 feet with occasional seas up to 8 feet. Dominant period 11 seconds. North swell 4 to 5 feet. Scattered showers and isolated Thunderstorms.
Wednesday..East winds 10 to 15 knots. Seas 3 to 5 feet with occasional seas up to 6 feet. Dominant period 10 seconds. Scattered showers and isolated Thunderstorms.
Thursday..Southeast winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 10 seconds. Isolated Thunderstorms. Scattered showers.
AMZ700 400 Am Ast Sun May 26 2019
Synopsis for puerto rico and the uS. Virgin islands waters... A moderate easterly wind flow will continue across the regional waters through at least Sunday. A more southeasterly wind flow is expected to return from Sunday night through early next week. A slight increase in seas is forecast for Monday night through midweek as a northerly swell arrives and spreads across the atlantic waters and local passages. Shower and Thunderstorm activity is expected to increase across the regional waters on Monday and Tuesday.


7 Day Forecast for Marine Location Near Cata?o, PR
   Hourly   EDIT   Help
location: 18.46, -66.12     debug


Area Discussion for - San Juan, PR
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxca62 tjsj 260819 cca
afdsju
area forecast discussion... Corrected
national weather service san juan pr
419 am ast Sun may 26 2019

Synopsis A moderate east to southeast wind flow will prevail
across the region. Enhanced shower and thunderstorm development is
expected, particularly along the interior and western puerto rico
during the afternoon hours. This activity is forecast to peak on
Tuesday through Thursday. That said, there will be a potential for
urban and small stream flooding each day. A seasonal and
relatively drier weather pattern is expected to return by the end
of the workweek.

Short term Today through Tuesday...

models still insist in a wet pattern for the next few days. The
satellite derived precipitable water (pw) indicates that there is
already an area with over 2 inches of pw around pr and over the
usvi. The latest guidance indicates that this plume of moisture will
linger for the next few days, causing the available moisture to be
above normal through at least the first part of the week. The mid
and upper levels will have some weak divergence which provides some
instability. Even though there is some cloudiness in the upper
levels, they are mostly south of puerto rico, so there could be some
diurnal heating and local effects to consider today. For that
reason, there are numerous showers and isolated thunderstorms in the
forecast today, even though we stayed a bit drier than the very
bullish WRF model, some of the other hi-res models are less
aggressive with the rainfall today. That said, the truth is that all
of the guidance and observations indicate that we should expect a
rainy pattern today through Tuesday with variably to mostly cloudy
skies. Even considering some discrepancies among the different model
guidance, the discrepancies are generally slight but essentially
indicate the same message. The areas with the heaviest rainfall are
expected to be across the interior to western and northwestern pr in
the afternoon hours each day. The usvi is expected to have mainly
scattered and passing showers, at times the showers may be
moderate to heavy but the duration of any one showers is expected
to be brief. So, variably to mostly cloudy skies could also be
expected for the usvi with a few showers from time to time.

Across the western atlantic we have a surface high pressure, which
will slowly move east and pass to the north of the local area,
mainly causing moderate east to ese winds for the next few days.

There will also be an upper trough digging across the western
caribbean, which will technically keep the local islands under a
ridge. That said, the pressure gradient in the upper levels will
tighten just to the NE of the local islands, likely causing some
speed divergence and contributing some instability over the local
area. The GFS forecast soundings seem to be in agreement and they
also show the column of moisture increasing at all levels with each
passing day. Also, the instability and energy parameters seem to
support enough instability for thunderstorms to develop. One thing
to note though is that the GFS model initialized a bit drier than it
was actually observed at 26 00z, causing the precipitable water
currently being observed at 06z to be higher than what the model is
suggesting, which puts a question mark on the pw forecast in the
short term.

Long term Wednesday through Sunday...

a wetter and unsettled weather pattern is expected during the
long-term forecast period, but recent model guidance suggests
that this pattern will hold only on Wednesday and Thursday. This
will be the result of high moisture content across the region with
pw model estimated values ranging between 2.15 inches on
Wednesday morning to 1.93 inches on Thursday afternoon. In
addition, a series of southeasterly propagating mid to upper level
short-wave troughs will promote favorable upper level conditions--
a divergence pattern and increased instability aloft--during this
period. If models forecast unfolds, which so far they have been
fairly consistent, these conditions will support enhanced shower
and thunderstorms development while maintaining an elevated
potential for urban and small stream flooding across the local
islands.

A more seasonal weather pattern with overnight and morning
showers streaming over the waters into eastern puerto rico and the
u.S. Virgin islands, followed by locally induced afternoon
convection along the interior and western puerto rico is expected
to return on Friday and continue through the weekend.

Aviation Shra gradually increasing, which will cause vcsh for
tist, tisx and tjsj in the morning.VFR conds expected through
26 16z. Shra tsra will result in vcsh vcts conds and brief MVFR
conditions at tjmz tjbq after 26 17z. Bkn to ovc between fl020-040
expected with this activity, bkn050-060 expected elsewhere. Light
and variable winds through 26 13z, turning from the east to ese at
10-15 kt with sea breeze variations and occasional gusts.

Marine Tranquil marine conditions with seas up to 5 feet are
expected to prevail across the regional waters through at least
Monday afternoon, before a northerly swell arrives and spreads
across the atlantic waters and local passages. The latter will
result in choppy seas up to 6 feet and caution from small craft
operators. A moderate east to southeast surface wind flow peaking
at 10-15 knots will hold across the region. There is a moderate
risk for rip currents for beaches along the north coast of puerto
rico, vieques, culebra, and saint thomas. Elsewhere, a low risk
will continue.

Preliminary point temps pops
Sju 89 79 88 76 40 40 40 20
stt 87 78 86 77 30 30 20 40

Sju watches warnings advisories
Pr... None.

Vi... None.

Am... None.

Short term... Ja
long term... .Icp


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SJNP4 - 9755371 - San Juan, PR 0 mi39 min NE 6 G 8.9 82°F 82°F1015.7 hPa
41053 - San Juan, PR 1 mi57 min ENE 5.8 G 7.8 81°F 82°F4 ft1014.9 hPa (+0.6)
AROP4 - 9757809 - Arecibo, PR 31 mi39 min NE 7 G 9.9
YABP4 - 9754228 - Yabucoa Harbor, PR 32 mi39 min 87°F 75°F
JOXP4 - Jobos Bay Reserve, Puerto Rico 35 mi72 min E 4.1 86°F 1017 hPa73°F
41056 37 mi57 min E 7.8 G 12 81°F 82°F1014.8 hPa (+0.7)
ESPP4 - 9752695 - Esperanza, PR 43 mi45 min E 6 G 8.9 83°F 82°F1015.8 hPa
CLBP4 - 9752235 - Culebra, PR 45 mi45 min 86°F 83°F1015.6 hPa
42085 - Southeast of Ponce, PR 47 mi117 min ENE 7.8 G 9.7 83°F2 ft1014.3 hPa (+1.0)

Wind History for San Juan, PR
(wind in knots)    EDIT      (on/off)   Help
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
Last
24hr
NE11
G14
NE10
G13
NE10
NE10
G14
NE9
G12
NE9
G13
E12
G16
E9
G13
E11
G14
E7
G11
NE8
G11
NE7
G11
E9
G13
E9
E8
E5
E4
G8
SE5
S3
S2
S3
S2
NE6
G9
NE6
G10
1 day
ago
SE13
G18
SE10
SE11
G14
E14
G18
SE9
G12
--
SE11
SE12
SE6
SE7
SE4
SE5
SE6
SE4
SE5
SE5
SE5
SE4
E7
E10
E7
E11
E14
G17
E16
2 days
ago
NE13
G16
E13
G17
E6
G9
E17
E9
SE6
SE5
SE6
S3
SE3
E7
S4
SE2
SE7
SE4
SE3
S2
--
S3
E3
SE2
E9
G12
E13
G16
SE18

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
Click EDIT to select an airport
Tide / Current Tables for San Juan, La Puntilla, San Juan Bay, Puerto Rico
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Boca De Cangrejos, Isla Verde, San Juan, Puerto Rico
   EDIT      (on/off)   Help   One Week of Data
Boca De Cangrejos
Click for Map
Sun -- 12:41 AM AST     Moonrise
Sun -- 03:08 AM AST     1.24 feet High Tide
Sun -- 05:47 AM AST     Sunrise
Sun -- 09:59 AM AST     0.37 feet Low Tide
Sun -- 12:23 PM AST     Moonset
Sun -- 12:34 PM AST     Last Quarter
Sun -- 03:30 PM AST     0.80 feet High Tide
Sun -- 06:54 PM AST     Sunset
Sun -- 09:11 PM AST     0.34 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
0.811.21.21.21.10.90.70.50.40.40.40.50.60.70.80.80.70.60.50.40.30.40.5

Weather Map and Satellite Images
       (on/off)   HelpWeather Map
wmap_A
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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (10,2,3,4)
      (on/off)   Help

Ground Weather Radar Station Puerto Rico,Virgin Islands
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.