Scientific Forecaster Discussion
fxca62 tjsj 241850
Area forecast discussion
National Weather Service San Juan PR
issued by National Weather Service Miami Florida
250 PM AST sun Sep 24 2017
..corrected for issuing office...
deep tropical moisture remains in place with a persistent
southeast flow which allows for precipitable water values to be in
excess of 2 inches across the islands. All of this coupled with an
incoming easterly wave will bring a chance for rain by later
tonight for the USVI and by tomorrow for Puerto Rico.
Heat index values will be near 100 for the next few days, bringing
hot and sticky weather to the area. This will make recovery
efforts difficult and overall living unpleasant as electricity
remains out across the island.
relatively drier conditions are expected by late Tuesday as
precipitable water values drop below 2 inches when the upper level flow
becomes more easterly. This will bring a more seasonable airmass to
sufficiently moist air mass remains in place over the region to
allow for isoalted showers and thunderstorms, particularly over the
western third of Puerto Rico. VFR conditions prevailing but brief
restrictions possible in the vicinity of convection. Coverage of
showers and thunderstorms may increase a bit Monday as a weak
tropical wave moves east to west over the region.
southeast winds will continue through Monday night. Shower
activity will be isolated to scattered today, but increasing
showers and thunderstorms will move in from the east Sunday night
into Monday. More seasonable easterly winds will return Tuesday.
Preliminary point temps/pops...
sju 80 86 80 86 / 0 0 70 40
stt 82 83 82 83 / 30 60 90 80