Area Forecast Discussion
Issued by NWS San Diego, CA

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000
FXUS66 KSGX 191057
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
357 AM PDT Sat Aug 19 2017

.SYNOPSIS...
High temperatures will cool to around 5 degrees below average on
Monday...then slowly warm next week...warming to near to a few
degrees above average for next weekend. Mid level monsoonal
moisture will move northwestward across the eastern deserts of
Southern California at times into Tuesday with southwest
California on the fringes of that moisture. A slight chance OF
thunderstorms is possible for the mountains and deserts of San
Bernardino County around Monday. The marine layer and weak onshore
flow will continue night and morning coastal low clouds and patchy
fog extending into the western valleys.


&&

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

.SHORT TERM (Today through Monday)...
A weak low pressure system will remain off the Southern California
coast through Monday. This will draw some mid level monsoonal
northwestward across the eastern deserts of Southern California at
times into Tuesday with southwest California on the fringes of
that moisture. The greatest influx of moisture across the eastern
deserts is expected for Sunday night into Monday morning. A slight
chance of thunderstorms is possible for the mountains and deserts
of San Bernardino County around Monday afternoon.

High temperatures near to slightly below average today will cool
to around 5 degrees below average on Monday. Areas of coastal low
clouds and patchy fog will extend into the western valleys early
this morning. Slow deepening of the marine layer will allow the
coastal stratus to spread into portions of the inland valleys for
tonight and again Sunday night.

With southwest California on the western fringe of monsoonal
moisture...some afternoon clouds are possible near the mountains
today and Sunday...mainly for the San Bernardino County mountains
and adjacent deserts. A greater influx of mid level moisture is
possible for Sunday night into Monday morning across the eastern
deserts. This could increase cloud cover some across the San
Bernardino County mountain and desert areas with most of any
precipitation expected to remain to the northeast. Drier air from
the south and southwest is expected to spread into the area on
Monday...but there could be enough residual mid level moisture for
a few thunderstorms in the San Bernardino County mountains and
adjacent deserts Monday afternoon.

&&

.LONG TERM (Tuesday through Friday....
The weak low pressure system off the Southern California coast
will move inland and weaken around Wednesday with a weak trough of
low pressure moving inland through the Pacific Northwest on
Thursday. High temperatures will return to near to slightly below
average for Tuesday through Thursday...then warm to near to
slightly above average for Friday and Saturday.


&&

.AVIATION...
190900Z...Coast/Valleys...Stratus with bases 1200-1600 ft MSL and
tops near 1900 ft MSL continue to spread 20-25 miles inland through
sunrise. 2-4 SM VIS in BR expected where low clouds near higher
terrain. Low clouds clearing to the coast 16-18Z. Stratus
redeveloping along the coast after 20/00Z with bases near 1500-2000
ft MSL and spreading into the valleys overnight.

Mountains/Deserts...Mostly Clear skies and unrestricted visibility
through Sunday morning.

&&

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

&&

.BEACHES...
A 2-3 ft/14-15 sec period swell from 200 degrees will continue
through the weekend, producing surf of 4 to 5 ft north of Carlsbad.
Strong rip currents will accompany the surf. High tides each evening
will peak around 6.5-6.8 feet, possibly leading to minor tidal
overflow. A Beach Hazards Statement remains in effect through Sunday
evening.

&&

.SKYWARN...
Skywarn activation will not be needed today.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Beach Hazards Statement from this afternoon through Sunday
     evening for Orange County Coastal Areas-San Diego County
     Coastal Areas.

PZ...NONE.

&&

$$

PUBLIC...17
AVIATION/MARINE/BEACHES...SS



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