Area Forecast Discussion
Issued by NWS San Diego, CA
FXUS66 KSGX 280419
AREA FORECAST DISCUSSION
National Weather Service San Diego CA
919 PM PDT FRI MAY 27 2016
A deep marine layer and cool weather will continue this holiday
weekend as weak low pressure over Southern California continues.
There is a slight chance of showers and thunderstorms in the
mountains and high desert Saturday and Sunday. High pressure will
bring warmer weather next week.
.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
Coastal low clouds pushed ashore before sunset this evening but
then put on the brakes. Eventually these clouds will fill the
coastal basin overnight. Our fair and cool weather will continue
through the weekend as a weak low pressure trough continues
overhead. This trough actually deepens into a cutoff low Saturday
and Sunday. It has just enough moisture and instability for a
small chance of showers and thunderstorms during the afternoons in
the mountains and high desert. The low pressure will keep our
marine layer deep and the low clouds extensive during nights and
mornings. Even a couple patches of drizzle are possible.
Afternoons should be mostly sunny although the clouds may be a bit
more persistent Sunday. Memorial day looks warmer as the trough
slowly moves out and temperatures will be quite seasonal. High
pressure amplifies Tuesday and Wednesday for a more robust warming
trend those days. The marine layer will be less extensive and so
will the coastal clouds those days. Daytime temperatures will head
above average Tuesday through probably Thursday. Some version of a
trough off the west coast appears to develop later next week to
push aside the ridge, but how much cooling or when it arrives is
280415Z...Coast/Valleys...BKN/OVC stratus with bases 1500-2000 ft
MSL and tops 3000 ft will continue to spread through coastal areas
and cover most valley locations by 09Z. Patchy drizzle will occur
between 09Z-16Z. Local visibility below 3 mi will occur in some
valleys, including vcnty KRNM and KF70. Slow clearing will occur
Saturday, with valleys clearing 16Z-18Z and coastal areas clearing
Mountains/Deserts...Mostly clear skies will prevail through 18Z
Saturday. SCT-BKN080-120 with isolated shra will occur over the
mountains 18Z Saturday through 02Z Sunday. Unrestricted vis will
prevail through Saturday.
915 pm...No hazardous marine conditions are expected through
Skywarn activation is not requested. However weather spotters are
encouraged to report significant weather conditions.