Scientific Forecaster Discussion
Area forecast discussion
National Weather Service San Juan PR
211 PM AST Sat Dec 3 2016
Discussion...isolated to scattered showers move inland and
affected the southeast portions of Puerto Rico mainly affecting
the municipalities of Maunabo and Patillas. Later in the morning
showers developed along La Cordillera central. These showers move
over the northern portions affecting the San Juan metropolitan
area. A similar weather pattern is expected to prevail through at
least Monday, with overnight and morning showers affecting the
eastern portions of Puerto Rico and U.S. Virgin Islands and later
in the afternoon showers affecting the interior and western
portions of Puerto Rico.
The upper level ridge pattern is forecast to slowly erode into the
upcoming week. At low levels, winds are forecast to become more
easterly as a high pressure builds over the Atlantic waters. Also,
a frontal boundary is forecast to moves to the north and near the
local region. Due to the proximity of this frontal boundary and
under the prevailing northeasterly wind flow the chance of early
morning cloudiness and quick passing showers along the north and
east coastal section of the islands is expected to increase at
least until midweek.
Aviation...mainly VFR conditions are expected across all
terminals after 22z. Brief periods of MVFR conditions with mountain
obscurations can be expected over the PR Mainland terminals through
at least 22z. Low level winds will be mainly east around 10 kts,
however, light and variable winds expected overnight at the surface.
Marine...mariners can expect seas up to 5 and winds at 10 knots or less. A
northerly swell is forecast to move across the Atlantic waters and
Caribbean passages late Monday or Tuesday.
Preliminary point temps/pops...
sju 77 86 76 85 / 20 20 20 20
stt 76 86 74 85 / 20 20 20 20