Tuesday, November20, 2018 L-36.com

Marine Weather and Tides
Arroyo, 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 5:37AMSunset 5:15PM Tuesday November 20, 2018 1:18 PM CST (19:18 UTC) Moonrise 5:02PMMoonset 4:10AM Illumination 95% Phase: Waxing Gibbous; Moon at 13 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

7 Day Forecast for Marine Location Near Arroyo, PR
   Hourly   EDIT   Help
location: -34.81, -58.22     debug

Area Discussion for - San Juan, PR
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxca62 tjsj 201548
area forecast discussion
national weather service san juan pr
1148 am ast Tue nov 20 2018

Update Fair weather conditions have prevailed across the u.S.

Virgin islands and puerto rico this morning. 12z tjsj sounding
showed moisture content well below normal, less than one inch of
precipitable waters as a mid-upper level ridge dominates the local
pattern. An area of low level moisture produced by a wind surge
will move over the local region during the next few hours,
generating a slightly increase in trade winds showers. The brisk
easterly winds will push these showers fairly quickly across the
local islands, therefore no flooding problems are anticipated the
rest of today. No significant changes were introduced to the
forecast package this morning as it is in line with the latest

Aviation Vfr conds expected across the local terminal thru the
forecast period. Easterly winds of 15-25 kts with gust up to 30
kts will prevail below fl150.

Marine No changes to the previous discussion. Choppy seas of
4-6 feet and winds of 15-20 kts will continue through at least
midweek. As a result, boaters should exercise caution across most
of the local waters.

Prev discussion issued 425 am ast Tue nov 20 2018
synopsis... A generally stable weather pattern to continue through
the end of the week under ridge pattern. However, patches of low
level moisture will assure passing showers later today through
this evening.

Short term... Today through Thursday...

fair weather conditions with significantly limited shower activity
will prevail across the forecast area through mid morning. An
area low level moisture now locate just east of the lesser
antilles will enter the anegada passage early this morning and
then over the local islands late this morning. Most of these
showers are fast pace moving and no significant rainfall
accumulations are expected. These showers could generate a few
gusty winds as they pass by. After this fair weather conditions
will continue with significantly limited shower activity across
the forecast area this evening. This is the result of drier air
moving across the region and the effects of a surface to mid-
level ridge of high pressure located over the north central
atlantic. The occasional patch of low- level moisture is expected
once again Wednesday afternoon into Thursday. If any convection
occurs, especially in the afternoon, it will be short- lived due
to unfavorable environmental conditions.

Long term... Friday through Tuesday...

on Friday although it will remain relatively stable, moisture
content across the region will begins to increase. After Saturday
the forecast will depend how close the frontal boundary will be
to our local forecast area. On the latest GFS model suggest the
highest amount of moisture will stay over the atlantic ocean but
enough moisture will reach the local area to increase the chances
of showers from Sunday through Tuesday.

Aviation...VFR conditions are expected to prevail across the
forecast area through 21 06z. As a band of moisture moves westward
across the region, expect vcsh first at tkpk tncm around 20 08z,
then tjsj at around 20 16z, tjps at around 20 22z, and tjbq at
around 20 22z. Afternoon convection will also bring vcsh to
tjmz tjbq between 20 16z and 20 22z. Winds will continue to prevail
from the east to northeast at 10 to 15 kt--highest along the coasts
with sea breeze influences and near showers and thunderstorms.

Marine... Small craft operators should exercise caution as
combined seas are forecast to be between 4 to 6 feet across local
atlantic waters, anegada passage and the off shore caribbean
waters. Easterlies winds throught at least mid week on the range
of between 10 to 20 knots. There is a high risk of rip currents
across many of the local northern exposed beaches today.

A a generally stable weather pattern to continue through
the end of the week under ridge pattern. However, patches of low
level moisture will assure passing showers particularly Tuesday
night into Wednesday morning. Northerly swell will reach the local
atlantic waters on Saturday night and peak on Sunday morning.

Preliminary point temps pops
Sju 87 76 87 76 40 60 20 20
stt 86 77 86 76 70 70 10 20

Sju watches warnings advisories
Pr... High rip current risk through Wednesday afternoon for northeast-
northwest-san juan and vicinity-southeast-western interior.

High rip current risk through Thursday afternoon for north

High rip current risk through late tonight for culebra.

Vi... None.

Am... None.

Aviation... Er
radar... .Cam er

Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
Click EDIT to select an airport
Tide / Current Tables for
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help
Tide / Current Tables for
   EDIT      (on/off)   Help
Weather Map and Satellite Images
       (on/off)   HelpWeather Map
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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (14,3,4,5)
      (on/off)   Help

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

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.