Area Forecast Discussion
Issued by NWS San Juan, PR

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805
FXCA62 TJSJ 241806
AFDSJU

Area Forecast Discussion
National Weather Service San Juan PR
206 PM AST Fri Feb 24 2017

.SYNOPSIS...
A surface low pressure and associated frontal boundary and a high
pressure system will continue to induce a southerly wind flow
across the local islands. In addition, a mid level high pressure
will continue over the region at least until the upcoming week.
Under the prevailing weather pattern, expect warmer than normal
temperatures with limited shower activity at least until Saturday.

&&

.DISCUSSION...
A southerly wind flow produced warmer than normal temperatures
across Puerto Rico, with coastal maximum temperatures in the upper
80s to low 90s mainly across the northern half portion of Puerto
Rico. However, maximum temperatures across the U.S. Virgin Islands
continues around the mid 80s. The Doppler Radar detected little
to no shower activity across the islands today, with just a few
passing showers across the windward sections. However, the
interior and northern half portion of Puerto Rico can expect
afternoon convection at least until around the evening hours. Some
showers are also possible downwind from the northern U.S. Virgin
Islands the rest of this afternoon.

This weather pattern is expected to continue at least until
Saturday with warmer than normal temperatures and limited shower
activity. By early next week, a prefrontal trough and low level
convergence will increase the frequency of trade wind showers
across the local islands. As the surface high pressure builds
north of the region, trade wind are expected to increase locally
by the first part of the upcoming week.

&&

.AVIATION...
Mostly VFR conditions expected across the local flying area with
VCSH possible across the Leewards and USVI taf sites due to small
areas of low level moisture embedded in the trades, moving across
the region until 24/15Z. Southeast winds will continue light and
variable until 24/14Z, increasing to 10-15 knots after 24/14Z with
sea breeze variations. Mountain obscurations likely until 24/17Z.

&&

.MARINE...
Hazardous seas and dangerous breaking waves are expected across
the Atlantic shoreline of Puerto Rico, Culebra and the U.S. Virgin
Islands due to a northerly swell. Mariners can expect seas between
6 and 8 feet across the Atlantic Waters and Caribbean Passages.
This northerly swell will produce breaking wave heights between
8-10 feet. Seas are expected to slowly subside overnight. In
addition, beach goers should exercise caution due to a high risk
of rip current. Therefore, a High Rip Current Risk and a High
Surf Advisory are in effect along the Atlantic shorelines of
Puerto Rico, Culebra and northern USVI. Also, a Small Craft
Advisory is in effect for the Atlantic Waters and Caribbean
Passages.

&&

.PRELIMINARY POINT TEMPS/POPS...
SJU  73  86  75  84 /   0  30  20  20
STT  72  84  73  85 /  10  30  20  20

&&

.SJU WATCHES/WARNINGS/ADVISORIES...
PR...High Rip Current Risk through late tonight for Culebra-Mayaguez
     and Vicinity-North Central-Northeast-Northwest-San Juan and
     Vicinity-Southeast-Western Interior.

     High Surf Advisory until 2 AM AST Saturday for Culebra-North
     Central-Northeast-Northwest-San Juan and Vicinity-Southeast-
     Western Interior.

VI...High Rip Current Risk through late tonight for St.Thomas...St.
     John.. and Adjacent Islands.

     High Surf Advisory until 2 AM AST Saturday for St.Thomas...St.
     John.. and Adjacent Islands.

     Small Craft Advisory until 10 PM AST this evening for
     St.Thomas...St. John.. and Adjacent Islands.

AM...High Rip Current Risk through late tonight for Coastal Waters of
     Northern USVI and Culebra out 10 NM-Coastal Waters of
     Southern USVI Vieques and Eastern Puerto Rico out 10 NM.

     High Surf Advisory until 2 AM AST Saturday for Coastal Waters of
     Northern USVI and Culebra out 10 NM-Coastal Waters of
     Southern USVI Vieques and Eastern Puerto Rico out 10 NM.

     Small Craft Advisory until 10 PM AST this evening for Anegada
     Passage Southward to 17N-Coastal Waters of Northern USVI
     and Culebra out 10 NM.

     Small Craft Advisory until 2 AM AST Saturday for Coastal Waters
     OF Northwestern Puerto Rico out 10 NM-Coastal Waters of
     Northern Puerto Rico out 10 NM-Mona Passage Southward to
     17N.

     Small Craft Advisory until 8 AM AST Saturday for Atlantic Waters
     of Puerto Rico and USVI from 10 NM to 19.5N.

&&

$$

23/27



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