Regional Weather Summary
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AWCA82 TJSJ 202115

Weather Summary for the U.S. Virgin Islands
National Weather Service San Juan PR
515 PM AST Sun Aug 20 2017

Mostly cloudy skies prevailed across the local islands and
surrounding waters this afternoon. Doppler radar indicated
scattered to numerous showers and isolated thunderstorms across
the local islands as well as and the surrounding coastal waters.
A Flood Advisory was issued for St Thomas and St John early in the
afternoon. Several Marine Weather Statements were also issued due
to frequent lightnings across most of the coastal waters. Winds
were mostly from the east southeast at 15 to 20 mph with higher
gusts especially near showers and thunderstorms. Maximum
temperatures this afternoon were mostly in the upper 80s.

The afternoon shower and thunderstorm activity was associated with
the combination of daytime heating with the moisture provided by
a surface low pressure located a couple of hundred miles northwest
of Puerto Rico. The surface low will continue to move west
northwestward across the Atlantic waters away from the local
islands tonight. The shower and thunderstorm activity is expected
to diminish after sunset. Latest model guidance indicated
that a relatively drier air mass will move across the forecast
area early Monday Morning. However, the lingering moisture will
produce isolated to scattered across the local islands and
surrounding waters on Monday.

Mariners can expect seas between 5 to 7 feet with occasional seas
up to 9 feet and winds of 10 to 15 knots. Therefore, small Crafts
Advisories are in effect for the offshore Atlantic waters. In
addition, there is a moderate rip current risk across most of the
beaches in PR.


This product is issued around 5 AM and 5 PM each day and weather
conditions may change between issuances. Please verify the status
of any Watches...Warnings or Advisories mentioned in this product. is the U.S. government's official web portal to all federal, state and local government web resources and services.