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FXUS66 KSGX 161044
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
344 AM PDT Sun Jun 16 2019

.SYNOPSIS...
Weak low pressure aloft will maintain typical June weather with
near to slightly below normal daytime temperatures and marine
clouds and fog spreading well inland each night. Midday clearing
back to coastal areas is expected, but clearing may be delayed or
limited some days due to fluctuations in the marine layer and cloud
depth. The deserts will be seasonably hot under fair skies. Slight
warming is possible mid next week as a ridge attempts to build
aloft, but a return to cooler weather is likely before the
weekend.

&&

.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...

Coastal stratus spreads well inland filling the inland valleys
this morning with onshore gradients hovering about 7-8 mb from the
coast to the Great Basin. Cloudiness and patchy fog will scatter
out this morning from the inland valleys but linger at the coast
into the afternoon. Max temps today will be similar to yesterday
except in the high desert where a couple degrees of cooling will
take place as an upper level trough approaches the region this
afternoon.

A series of weak shortwaves will maintain the troughy pattern over
the region through Tuesday. This will keep temperatures fairly
uniform each day with extensive marine layer induced cloudiness
developing each evening and spreading through the valleys.

By Wednesday, a high pressure ridge over the East Pac will nose
into Central California, bringing some warming to our region,
especially for the mountains and deserts. The ridge will gradually
weaken and the ensemble and deterministic model forecasts seem to
be in better agreement that the ridge will be short lived, as a
longwave trough from the Pac NW drops into the Great Basin by
Friday and into next weekend, bringing a return to slightly cooler
than normal conditions and a return of the deeper, more seasonal,
marine layer and stronger inversion for SoCal.

Deeper troughing over the SW will likely bring stronger diurnal
wind patterns once again, as we had seen a few days ago, with
onshore gusts up around 50 mph in the more wind favored passes and
canyons. The SW troughy pattern could hang around into the
following week as well.

&&

.AVIATION...
160315Z...Coast/Valleys...Low clouds with bases 1200-1800 ft MSL
will continue to spread inland overnight, reaching KONT and KSBD
after 09Z. Local vis restrictions of 3-5 SM in BR/HZ in the valleys
and coastal slopes of the mountains obscured in clouds through
around 16Z. Scatter out expected in the valleys after 16Z and on the
coast after 18Z.

Mountains/Deserts...Mostly clear with unrestricted vis through
Sunday. West winds with sfc gusts 25-35 kt will occur along the
mountain crests and desert mountain slopes and below the passes this
evening, weakening overnight. Areas of up/down drafts are possible
over and east of the mountains.

&&

.MARINE...
No hazardous marine conditions are expected through Thursday.


&&

.SKYWARN...
Skywarn activation is not requested. However weather spotters are
encouraged to report significant weather conditions.


&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...NONE.
PZ...NONE.
&&

$$

PUBLIC...Brotherton
AVIATION/MARINE...SS
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