Area Forecast Discussion
Issued by NWS San Juan, PR

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FXCA62 TJSJ 212001
AFDSJU

Area Forecast Discussion
National Weather Service San Juan PR
401 PM AST Sat Oct 21 2017

.SYNOPSIS...Upper level ridge will continue to dominate across
the region until at least Monday producing a relatively dry and
stable weather pattern across the forecast area. The next tropical
wave will be for next Friday generating a better chance of showers
and thunderstorms through next weekend.

&&

.SHORT TERM... Although dry and stable conditions will continue to
prevail across the local forecast area. patches of moisture embedded
in the trades will produce some showers overnight and during the
morning hours with afternoon showers across western Puerto Rico.

.LONG TERM...
An upper level low sinking southeast toward the Leeward Islands
on Tuesday and Wednesday, but divergence/convergence remains
mainly neutral at upper levels even as moisture slowly increases
through the week. This will result in a gradual increase in shower
activity by mid week. Convection is expected to increase even
more Friday and during the upcoming weekend as a tropical wave
approaches the region.

&&

.AVIATION...Mostly VFR conditions expected across all terminals
throughout the forecast period. E-SE winds of 10-15KT diminishing
below 10KT after 22/00z, increasing once again above 10-15KT after
22/14z with sea breeze variations developing.

&&

.MARINE...Seas up to 6 feet and winds up to 20 knots will continue
across the surrounding waters during the rest of the weekend.
Small Craft are urged to exercise caution across most of the
coastal waters.


&&

.PRELIMINARY POINT TEMPS/POPS...
SJU  77  89  77  88 /  10  10  20  20
STT  78  88  77  88 /  10  10  20  20

&&

.SJU WATCHES/WARNINGS/ADVISORIES...
PR...None.
VI...None.
AM...None.
&&

$$

SHORT TERM...OM
LONG TERM....EM


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