Area Forecast Discussion
Issued by NWS San Juan, PR
FXCA62 TJSJ 160955
Area Forecast Discussion
National Weather Service San Juan PR
555 AM AST Mon Jan 16 2017
.SYNOPSIS...High pressure across the western Atlantic will
maintain a fresh northeast wind flow across the local region
through Wednesday. High pressure will weaken at the end of the
week as a deep surface low pressure moves across the western
.DISCUSSION...Passing showers were observed across the local area
overnight. Most shower activity was observed across the Caribbean
coastal waters. Local area continue to be dominated by a surface
high pressure system which is located across the western Atlantic.
This high pressure system will continue to produce fresh northeast
winds across the local area through at least Wednesday. Therefore,
passing showers will continue to affect the local area from time
By the later part of the work week, the aformentioned high
pressure system is expected to weaken, which will allow for a
relax in the pressure gradient. As a result, winds will diminish
considerably by Friday. Under a mid to upper level ridge,
relatively fair weather conditions are expected without any
significant weather events affecting the region. Temperatures will
remain very pleasant, with minimum temperatures expected to drop
to the mid to upper 50s by the later part of the work week, as
clear skies are anticipated and winds will be light and variable.
.AVIATION...Mostly VFR conditions expected through the forecast
period. Some passing showers are expected over TIST and TJSJ from
time to time. Low level winds will continue mainly ENE at 10 to 15
kts with higher gusts, mainly in showers.
.MARINE...Latest buoy observations are showing seas between 5 to 7
feet with occasional seas up to 8 feet mainly across the offshore
Atlantic waters. Seas are expected to diminish gradually next few
days. However, marine conditions will continue hazardous through
at least Wednesday. High Surf advisory was cancelled as breaking
waves of 10 feet are no longer expected. Small Craft advisories
will continue in effect through at least Wednesday.
.PRELIMINARY POINT TEMPS/POPS...
SJU 82 74 82 73 / 40 30 30 20
STT 84 72 83 71 / 40 30 30 20
PR...High Rip Current Risk through Tuesday afternoon for Culebra-
Mayaguez and Vicinity-North Central-Northeast-Northwest-San
Juan and Vicinity-Southeast-Vieques-Western Interior.
Small Craft Advisory until 6 AM AST Wednesday for Northeast.
VI...High Rip Current Risk through Tuesday afternoon for St Croix-
St.Thomas...St. John.. and Adjacent Islands.
AM...High Rip Current Risk through Tuesday afternoon for Coastal
Waters of Northern USVI and Culebra out 10 NM-Coastal
Waters of Southern USVI Vieques and Eastern Puerto Rico out
Small Craft Advisory until 6 AM AST Wednesday for Anegada
Passage Southward to 17N-Atlantic Waters of Puerto Rico and
USVI from 10 NM to 19.5N-Caribbean Waters of Puerto Rico
from 10 NM to 17N-Coastal Waters of Northern Puerto Rico
out 10 NM-Coastal Waters of Northern USVI and Culebra out
10 NM-Mona Passage Southward to 17N.
Small Craft Advisory until 2 AM AST Tuesday for Coastal Waters
OF Northwestern Puerto Rico out 10 NM-Coastal Waters of
Southern USVI Vieques and Eastern Puerto Rico out 10 NM.