National Weather Service San Juan PR
545 AM AST Sun Jun 3 2018
.SYNOPSIS...Hazy skies due to suspended dust will continue today
across the region. Limited shower activity is forecast across the
islands for the next few days. Surface high pressure northeast of
the region will continue to promote light to moderate
southeasterly trades. Above normal temperatures are expected
today, especially along the coastal areas of the islands.
&&
.SHORT TERM...Today through Tuesday...
High pressure at the surface will continue in the central Atlantic
with a ridge over the Atlantic waters extending west just north of
the forecast area and the tropic of Cancer. High pressure at mid
levels will continue through beyond Tuesday. Saharan dust has caused
lower visibilities and breathing difficulties for some, but will
begin to thin out tonight. Light amounts will remain, however,
through the period. With southeast to south flow at lower levels
warmer than normal temperatures will be experienced along the north
coast, pushing highs into the lower 90s. The record high temperature
for San Juan today is 94 degrees. With dew points near the coast
reaching the mid 70s this will produce apparent temperatures between
100 and 103 degrees in a few places along the north coast of Puerto
Rico. Some precautions for excessive heat should be taken. Little
change is expected until later on Tuesday.
Few showers are expected today, however areas that become very warm
will be unstable, even with dry air blanketing the area above the
marine layer. These isolated showers will be mainly in the northwest
section of Puerto Rico. Some could be briefly heavy, but flooding is
not expected. Few, any showers, should be expected in the early
morning hours today and Monday. Showers activity will increase on
Tuesday, but conditions will still be mostly dry. Precipitable water
values will continue to drop until Monday evening and is not
expected to return to the current levels until Tuesday evening.
.LONG TERM...Wednesday through Monday...
A mid level ridge is expected to hold through the long term
period over and to the east of the region. On Wednesday a
tropical wave is forecast to move mainly south of the region,
across the Caribbean waters and increase the available low level
moisture across the local area. This will enhance afternoon
convection over Puerto Rico, mainly over the interior and
northwestern quadrant of the island. Also, the frequency of
passing showers should increase across the Caribbean waters and
the Anegada Passage during the morning hours.
The surface high pressure is forecast to build and relocate over
the Central Atlantic late in the work week and into the weekend.
This will result in an increase in the trades and will also keep
an east to southeast steering wind flow across the region.
Therefore, normal to above normal should continue through the long
term period, and diurnally induced afternoon showers are expected
each afternoon...mainly over northwestern PR.
&&
.AVIATION...VFR conds expected entire forecast area thru 04/16Z.
Minor SHRA to dvlp NW PR aft 03/18Z for several hrs, but expect TAF
sites to remain VFR. Saharan dust will limit vsbys to less than 12
miles today and Monday.
&&
.MARINE...Small pulse of NNE long period swell will continue
across the Atlantic waters today. This will cause a moderate risk
of rip currents along the northern beaches. Seas will generally
range between 3-5 feet and up to 6 across the Atlantic waters,
where small crafts should exercise caution. Winds will continue
from the east-southeast at 10-15 knots and locally higher along
the Atlantic coastal waters of Puerto Rico.
&&
.PRELIMINARY POINT TEMPS/POPS...
SJU 93 78 92 78 / 10 10 10 0
STT 88 79 88 79 / 10 10 10 10