Area Forecast Discussion
Issued by NWS San Diego, CA

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000
FXUS66 KSGX 242138
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
238 PM PDT Tue Apr 24 2018

.SYNOPSIS...
Fair and seasonal weather will continue this coming week. The
marine layer will continue the coastal clouds nights and mornings.
Lower pressure aloft this weekend into next week will bring cooler
weather for all areas, extend the marine layer and increase
coastal clouds.

&&

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

A nice day today with mild temperatures and the coastal low clouds
retreated off the coast this afternoon. Temperatures are running
near normal near the coast but warmer than normal well inland and
in the mountains and deserts due to weak high pressure aloft. The
marine layer was a little deeper this morning and should deepen a
little further tonight as onshore flow strengthens a bit. Coastal
stratus should build into the western valleys tonight with fog
likely to be found further inland than the previous several
periods.

Heights gradually decrease Wednesday through Friday as the pattern
shifts with a trough developing over Northern California.
Temperatures will remain above normal again Wednesday away from
the coast but look for significant inland cooling Thursday into
the weekend.

Onshore gradients will increase further and periods of gusty
onshore winds will be likely each afternoon and evening. Winds may
become strong enough to require a wind advisory by Friday. Much
cooler weather for Sunday through early next week. Upper level
trough will swing by to the north on Friday and Saturday with
periods of strong winds possibly continuing into Saturday night.

Cooler conditions will continue through at least the middle of
next week as another upper level trough deepens over SoCal Tuesday
and Wednesday next week with very cool conditions over inland
areas and periods of strong winds possible. Still a lot of
disagreement with the strength of the trough but better consensus
that it could drop far enough south and with enough cold air aloft
to bring a chance of showers to portions of SoCal. Haven`t added
any pops to the forecast yet until we have a little better run to
run continuity.

&&

.AVIATION...
2402020Z...Coast/Valleys...SCT high clouds, then after 25/02Z areas
of BKN-OVC stratus pushing inland with bases 800-1200 ft MSL with
tops to 1800 ft MSL. Low clouds extending about 20 miles inland
overnight. The risk of OVC low clouds at KSAN again tonight is high,
so the TAF low clouds forecast looks good.

Mountains/Deserts...SCT clouds at/above 25000 ft MSL with
unrestricted vis through Wednesday morning.

&&

.MARINE...
Stronger west to northwest winds will develop in mainly the coastal
waters beyond 30 NM each afternoon and evening Friday through
Sunday with gusts between 20 and 25 knots possible.


&&

.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...Small


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