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 5:36AM||Sunset 5:14PM||Sunday November 18, 2018 11:16 AM CST (17:16 UTC)||Moonrise 2:12PM||Moonset 2:20AM||Illumination 81%|
7 Day Forecast for Marine Location Near Pole Ojea, PRHourly EDIT Help
Area Discussion for - San Juan, PR  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxca62 tjsj 181604 cca|
area forecast discussion... Corrected
national weather service san juan pr
1204 pm ast Sun nov 18 2018
Another beautiful day across the islands with sunny skies and no
shower activity. Fair weather conditions will continue through at
least Wednesday, when a surface perturbation is expected to reach
the islands increasing the potential for showers and possibly
Vfr conditions expected across all terminals. Surface winds will
continue from the east to southeast at 15 to 20 kts with higher
gusts possible. Becoming calm to light and variable overnight.
Seas ranging between 5-7 feet will continue across the offshore
atlantic waters. Thus, a small craft advisory is in effect until 2
pm this afternoon, when seas are expected to diminish below 7
feet. However small craft operators are urge to exercise caution
due to seas up to 6 feet. Winds will be from the east to east-
southeast between 10-20 knots.
Prev discussion issued 521 am ast Sun nov 18 2018
synopsis... Moderate trade wind flow will bring scattered showers
to the area under upper level high pressure. A vigorous band of
moisture will increase showers on Wednesday and thunderstorms will
likely return to the interior. Then a cold front will approach the
area and may cross on Saturday.
Short term... Today through Tuesday...
a stable weather pattern will continue to prevail as a result of
limited moisture, a drier air mass and a surface and mid-level
ridge over the area. The drier air mass, the surface and the mid-
level ridges will limit shower development during the afternoon
across most of the forecast area through Tuesday. However moderate
trade winds with embedded moisture will periodically move in from
the east. This could lead to isolated showers--mainly over
portions of the interior and western puerto rico during the
afternoon. Tuesday, model guidance shows moisture returning from
the east and to the north of puerto as a result of a stationary
frontal boundary to the north of the islands. Therefore rain
chance should go up during the middle of the week.
Long term... Wednesday through Sunday...
at upper levels the ridge over the area will shift to the east|
through Thursday. A broad upper level trough will cross through
and north of the area late Friday and pass through the leeward
islands on Sunday. At the surface and at lower levels a band of
moisture will move through the area on Wednesday, followed by
another pulse on Thursday and Friday. On Saturday surface flow
slows and 700 mb flow becomes southwesterly as a front is forecast
to move into the forecast area and cross through puerto rico and
the u.S. Virgin islands. Confidence is somewhat low on this
crossing as the GFS generally moves fronts too far southeast, so
have tempered the forecast somewhat regarding shower activity.
There is moisture however so pops will be fairly good until
Sunday. The low level trough also stalls over the area with some
good moisture. Mid and upper level moisture values drop
significantly by Sunday, so rain chances are expected to taper off
Aviation...VFR conditions are expected to prevail across TAF sites
through 18 22z. -shra shra are forecast to develop across the
western and interior areas of puerto rico, or near terminal sites
tjmz and tjbq by 18 17z. Clearing is forecast to begin around
18 23z. Winds will continue to prevail from the east to northeast
at 15 to 20 kts with higher gusts possible--on exposed coasts.
Winds back to the east- northeast at 026 to 041 kft ranging from
20 to 30 kts.
Marine... Seas will come down some today and all small craft
advisories up previously will come down by 2 pm ast. Small craft
will need to exercise caution afterward. Conditions will
deteriorate briefly in the local atlantic outer waters Monday
night, but seas are expected to subside on Tuesday.
Preliminary point temps pops
Sju 87 76 88 77 20 20 30 20
stt 86 76 86 77 20 30 30 20
Sju watches warnings advisories
Pr... High rip current risk until 6 pm ast this evening for san juan
Am... Small craft advisory until 2 pm ast this afternoon for atlantic
waters of puerto rico and usvi from 10 nm to 19.5n.
Short term... Cam
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