National Weather Service San Juan PR
120 PM AST SUN JUL 10 2016
.SYNOPSIS...Tropical wave is moving across the Eastern Caribbean
today. Although showers and thunderstorms will affect the islands
this afternoon and evening...the bulk of the convection will remain
over the Caribbean Waters. Stable pattern with a pulse of Saharan
dust is forecast in the wake of the tropical wave. No significant
changes in the weather pattern is expected the rest of the work week.
&&
.DISCUSSION...Satellite loops show the best convection associated
with the tropical wave well south of the local area. Moisture in
the northern periphery of the wave is inducing the development of
scattered showers across the local area. Later this afternoon...
stronger showers and a few strong thunderstorms are still possible
over the northern half of Puerto Rico due to the interaction of
the wave and the orographic effects. Conditions will gradually
improve late tonight as the tropical wave moves away from the
forecast area.
Mid level high pressure will maintain a stable pattern across the
local islands most of the work week. Early in the week...Aerosol
models...NASA GEOS-5 and NAAPS indicate a pulse of Saharan Dust
moving across the region. This dusty air mass will produce hazy
skies and somewhat reduced visibilities. The relatively dry and
subsidence air mass at mid levels of the atmosphere will also
limit the development of showers across the local region through
midweek. Although...afternoon showers can not ruled out the
coverage over western PR will be mainly isolated or locally
scattered. No significant weather feature is foreseen the rest of
the work week. Synoptic models suggest better moisture the next
weekend when a tropical wave moves across the local region.
&&
.AVIATION...SHRA/TSRA possible later this afternoon with brief
MVFR conds and BKN-OVC cigs btw FL025-FL070 at TJBQ/TJSJ/TJMZ thru
at least 10/23z. Sfc winds from the east at 10-20 kt with sea
breeze variations and higher gusts in/near SHRA/TSRA.
&&
.MARINE...Winds of 15-20 knots and seas to 4-6 feet expected
through late tonight. Winds and seas will gradually subside
through midweek. Overall seas of 3-5 feet and winds of 10-15
knots can be expected most of the week. No Small Craft Advisories
anticipated this week.
&&
.PRELIMINARY POINT TEMPS/POPS...
SJU 77 90 78 89 / 50 10 20 20
STT 78 91 79 90 / 30 20 30 20