Marine Weather and Tides
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 5:37AM||Sunset 5:15PM||Tuesday November 20, 2018 1:18 PM CST (19:18 UTC)||Moonrise 5:02PM||Moonset 4:10AM||Illumination 95%|
7 Day Forecast for Marine Location Near Arroyo, PRHourly EDIT Help
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
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.
radar... .Cam er
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