Weather Service Report


599 
FXUS66 KSGX 240933
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
233 AM PDT Wed May 24 2017

.SYNOPSIS...
Cooler weather is in the forecast through Friday as a weak trough
of low pressure moves through the region. Low clouds will spread 
farther inland each day as the marine layer deepens. It will be
windy in parts of the mountains and deserts. There is a slight 
chance of light showers from the coast to the foothills Thursday 
night into Friday morning. High pressure will rebuild over the 
West this holiday weekend for warmer weather and a shallower 
marine layer.

&&

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

Coastal low clouds have been slowly advancing overnight, but not
much if at all into the valleys. Some high clouds will continue to
move across our sky coming from a weak low over the Pacific to our
west. A fair and cooler day is expected as a low pressure trough
bears down from the north and merges with that Pacific low today
and tonight. That will deepen the marine layer and extend the low
clouds into the valleys. It will also boost winds in the mountains
and deserts. Small portions of this region will have strong winds.
An advisory is in effect for gusty pockets in the northern
Coachella Valley and the Anza Borrego Desert late this afternoon
into Friday morning. The trough will deepen further Thursday and 
a shortwave will move through Southern California Thursday night 
into Friday morning. As the marine layer gets stretched out in the
vertical, some light showers could result. Friday will be 
unseasonably cool with highs in the 60s west of the mountains, 50s
and 60s in the mountains, and 70s and 80s in the deserts. The 
trough moves off and allows for some half-hearted ridge to build 
through the holiday weekend. The marine layer will gradually 
shallow while daytime temps will gradually rebound to slightly 
above average on Memorial Day. That means 70s near the coast and
in the mountains, 80s and lower 90s in the inland valleys and 
high desert, and back over the century mark in the lower deserts. 
A weak trough appears on the horizon next week which would bring 
slightly cooler weather and more extensive coastal clouds.

&&

.AVIATION... 
240900Z...Coast/Valleys...Widespread stratus near the coast and 
about 10 SM inland with bases 400-800 ft MSL continuing through mid 
morning. Areas of vis 3-5 SM over higher coastal terrain and down to 
1SM on coastal mesas/western valleys. Stratus clearing to the coast 
16-18Z. Bases lifting to 1000-1500 this evening, reaching the 
coastal airports 03-06Z and spreading into the inland valleys 
overnight. 

Mountains/Deserts...A few high clouds and unrestricted vis through 
Thu morning. Onshore winds becoming strong after 00Z this evening 
with gusts through the mountains and along the desert slopes up to 
45 KTS along with mdt up/downdrafts...and patchy blowing dust/sand 
in the deserts.

&&

.MARINE...
No hazardous marine weather is expected through Sunday. 

&&

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

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Wind Advisory from 5 PM this afternoon to 8 AM PDT Friday for 
     San Diego County Deserts-San Gorgonio Pass Near Banning.

PZ...None.

&&

$$

PUBLIC...MM
AVIATION/MARINE...Brotherton

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