Area Forecast Discussion
Issued by NWS San Juan, PR

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FXCA62 TJSJ 171453
AFDSJU

Area Forecast Discussion
National Weather Service San Juan PR
1053 AM AST Fri Nov 17 2017

.SYNOPSIS...Updated todays and tonight`s grids with the latest
model data. A weak frontal boundary is helping to produce showers
and thunderstorms across northwest, Mayaguez and Vicinity, and
north central Puerto Rico since 5 a.m. this morning. At this time
showers are now forming over southeast, eastern interior, and
northeast Puerto Rico.
Puerto rico and the U.S. Virgin Islands can expect mostly cloudy
skies and rain with isolated thunderstorms this afternoon, with
the showers and thunderstorms diminishing before sunset. The
17/12Z ROB showed precipitable water value greater than 2.0 which
is expected due to southerly winds of 10 to 15 mph drawing warm
moisture from the Caribbean waters over the local areas. Daytime
high temperatures will reach the mid 80s to lower 90s while higher
elevations will reach the upper 70s.

&&

.AVIATION...SHRA/TSRA activity is expected to increase across the
local area today, causing VCSH/VCTS across the local terminals
today with TEMPO MVFR conds possible. SFC winds out of the S to
SW at 5 to 15 kts, and FL016 to FL100 out of the SW to W at 15 to
20 kts.


&&

.MARINE...Seas 2 to 6 feet with southerly wind between 15 to 20
kts across the offshore waters and local passages. A moderate to
low risk for rip currents today over the Atlantic waters and
northern Puerto Rico along the north and east facing beaches.


&&

.PRELIMINARY POINT TEMPS/POPS...
SJU  88  77  86  78 /  60  40  60  60
STT  80  78  85  79 /  60  50  40  60

&&

.SJU WATCHES/WARNINGS/ADVISORIES...
PR...Flash Flood Watch until 2 PM AST this afternoon for Northwest-
     Western Interior.

VI...None.
AM...None.
&&

$$

SHORT TERM...TW
LONG TERM....JF



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