Area Forecast Discussion
Issued by NWS San Juan, PR
FXCA62 TJSJ 061737
Area Forecast Discussion
National Weather Service San Juan PR
137 PM AST Tue Dec 6 2016
.SYNOPSIS...Mid level ridge will continue to hold through the
rest of the work week. Surface high north of the area will
continue to move into the central Atlantic promoting moderate
northeasterly trades. An easterly wave and short wave trof are
forecast to bring a wetter pattern across the area on Friday.
Frontal boundary is forecast to remain north of the area through
.DISCUSSION...Sunny to partly cloudy skies prevailed across the
islands Today. Trade wind showers continued across the eastern
portions of PR and showers were developing across the
western/southwestern portions of PR early in the afternoon hours.
Across the USVI, streamers created periods of light showers over
the western portions of the islands and coastal waters.
Ridge aloft will remain as the main weather feature across the
region for the next few days limiting the shower activity across
the local islands and surrounding waters. Therefore, passing trade
wind showers are expected across the USVI and coastal sections of
eastern and northern Puerto Rico during the overnight and early
morning hours...followed by shallow afternoon convection over the
interior/western portions of PR. On Friday as easterly wave moves
across the Caribbean waters and coincides with trof aloft,
moisture and instability will increase across the forecast area.
Ridge pattern is forecast to follow through the weekend with
remnants of a frontal boundary promoting trade wind showers
across the forecast area.
.AVIATION...Mostly VFR conditions are expected across the local
flying area through the next 24 hours. SHRA expected to develop over
Eastern PR overnight and early in the morning. After 07/16Z, SHRA
are expected possibly affecting TJMZ causing brief MVFR conditions.
Winds will be East at around 10 kt tonight increasing to 10 to 15
knots after 07/13Z.
.MARINE...Seas of 4-6 feet in north swells will continue across
the Atlantic waters and the local passages with a high risk of rip
currents across the northwest to northeast facing beaches of
Puerto Rico, Culebra and St. Thomas. Elsewhere, seas between 3
and 5 feet expected.
.PRELIMINARY POINT TEMPS/POPS...
SJU 76 86 76 86 / 30 30 30 30
STT 76 86 76 86 / 30 30 30 30
PR...High Rip Current Risk through late tonight for Culebra-Mayaguez
and Vicinity-North Central-Northeast-Northwest-San Juan and
VI...High Rip Current Risk through late tonight 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.