Area Forecast Discussion
Issued by NWS San Juan, PR

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
FXCA62 TJSJ 181955

Area Forecast Discussion
National Weather Service San Juan PR
355 PM AST Sun Mar 18 2018

.SYNOPSIS....Fair weather is expected to prevail much of the
upcoming workweek with afternoon showers developing each day
over the Cordillera Central and west sections of Puerto Rico.
A frontal boundary will move close to the local isles Friday
into the weekend.


.SHORT TERM...Tonight thru Tuesday...

Heights will continue to fall through at least tomorrow with
precipitable water values remaining near the normal range which
is 1.35 inches. On Tuesday, ridge pattern aloft will build across
the local isles and hold through midweek. At lower levels, winds
are expected to be light and variable overnight, becoming more
east southeast Monday and Tuesday.

Under the aforementioned pattern expect a few passing showers
across the northern and eastern sections of Puerto Rico as well
as the USVI each day. Afternoon showers are also expected to
develop over the Cordillera Central and west areas of the island
both days. However, the intensity and areal coverage of showers
should decrease on Tuesday under building ridge.

.LONG TERM...Wed thru Mon.../issued 515 AM AST Sun Mar 18 2018/

Wednesday, the surface and mid to upper level ridge starts to
weaken ahead of a cold front moving off the east coast of the
United states. Southerly winds will carry warm moist air over the
region giving a possibility for showers during the afternoon
Wednesday through early Friday.

Friday, a col will form to the northeast of Puerto Rico with a
weak shear line forming over the western half of Puerto Rico with
showers and possible thunderstorms.

Saturday-Monday, A prevailing east northeast wind flow combined
with low level moisture will keep the islands in a unsettled
pattern with isolated showers mainly during the morning and


.AVIATION...Mainly VFR conditions will prevail across all terminals
during the next 24 hours. However, +SHRA over the interior sections
of PR could result in tempo MVFR conds at TJMZ/TJBQ/TJSJ through at
least 23z. Light winds with a southerly component will continue
through the evening hours...light and variable during the


.MARINE...Tranquil marine conditions will continue to prevail
across the local waters during the next few days with seas below
the Small Craft criteria.


SJU  86  74  85  74 /  30  20  20  20
STT  83  72  84  74 /  20  20  30  30




SHORT TERM....OM is the U.S. government's official web portal to all federal, state and local government web resources and services.