Scientific Forecaster Discussion
Area forecast discussion
National Weather Service San Juan PR
414 am AST Tuesday may 5 2015
as the surface high will continue to prevail across the local area
limiting the shower generation across the local islands. This
feature located over the the western Atlantic is forecast to
shifts eastward into the central Atlantic...this will tight the
local pressure gradient across the region increasing local winds.
Discussion...a drying weather pattern is expected through
Wednesday with a very minimal increase in low level moisture
thereafter. Therefore shower development if any will be very
limited and short live for the next several days. This dry
pattern and breezy conditions will also generate a healthy
environment for the development and spreading of wild fires.
Models are suggesting a relief on this dry and hot weather pattern
as an upper level trough approach from the west on Tuesday. This
feature will begin to increase relative humidities after Sunday as
the upper level trough approaches. We are to far away to know how
much rain this feature will generate therefore will continue to
monitor the development of this changing weather pattern that is
Aviation...VFR conditions expected at all taf sites the next 24
hours. A Saharan air mass is expected to move in...producing hazy
skies today. East-southeast winds 15 to 20 knots with gusts up to 25 knots.
Marine...although borderline Small Craft Advisory conditions will
prevail through tonight across the Atlantic waters and Wednesday
over the Caribbean waters. This is due to the combination of 4 to
5 feet northerly swell and fresh winds across the local waters.
As swell subside today Atlantic waters conditions will reach below
Small Craft Advisory conditions later today but southeast winds will continue to
generate choppy conditions across the Caribbean waters. North
northwest swell will reach our local waters Saturday morning.
Preliminary point temps/pops...
sju 89 78 90 78 / 10 0 10 10
stt 87 78 88 78 / 10 20 20 20
Am...Small Craft Advisory until 8 PM AST this evening for Atlantic waters
of Puerto Rico and USVI from 10nm to 19.5n.
Small Craft Advisory until 8 PM AST Wednesday for Caribbean
waters of Puerto Rico from 10 nm to 17n-Mona Passage
southward to 17n.