Area Forecast Discussion
Issued by NWS San Diego, CA

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268
FXUS66 KSGX 101139
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
339 AM PST Sun Dec 10 2017

.SYNOPSIS...
Moderate to strong Santa Ana winds will continue today with very
low humidities. Inland areas will remain very dry for much of the
week with periods of weak to occasionally moderate offshore flow
with gusty northeast to east winds near and along coastal mountain
slopes and below passes and canyons.

&&

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

Early this morning...upper level high pressure is centered over
California with weak upper level low pressure over the eastern
Pacific to the west of Baja. This low pressure system will spread
some high clouds into southwest California into Monday.

Surface high pressure will bring periods of moderate to strong
Santa winds through early afternoon with the strongest winds in
the mountains and inland valleys of San Diego County. The
strongest gusts overnight have mostly been between 60 and 70 mph.
The winds will gradually decreasing for this afternoon and tonight
with the winds continuing to weaken and become more localized on
Monday. Periods of weak to occasionally moderate offshore flow
will continue for much of the week.

High temperatures 10 to locally 15 degrees above average will
continue into Tuesday...then will slowly cool into next weekend by
remain above average.

&&

.AVIATION...
100945Z...NE to E winds 20-30 kt with gusts to 50 kt in the wind
prone passes and canyons and on the coastal mountain slopes and
foothills will create STG UDDFS/LLWS over and W or SW of the
mountains through about 11/00Z. Winds will decrease late this
afternoon and tonight. Otherwise, SCT-BKN clouds AOA 20000 ft MSL
and unrestricted vis through Monday morning.

&&

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

&&

.FIRE WEATHER...
Very low humidities will continue for much of the week for inland
areas. Lowest inland daytime humidities for the next few days
will continue to fall to 5 to 10 percent with poor overnight
recovery. Areas of northeast winds 25 to 35 mph with gusts to 65
mph will continue through early afternoon with the stronger and
more widespread winds from the mountain ridge tops and along the
coastal mountain slopes into the adjacent inland valleys and
inland Orange County...with the strongest winds in the mountains
and inland valleys of San Diego County. Northeast to east winds
will become weaker and more localized for Monday through much of
the week. Low inland humidities will continue for much of the
week.

&&

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

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...High Wind Warning until 4 PM PST this afternoon for San Diego
     County Mountains-San Diego County Valleys.

     Red Flag Warning until 8 PM PST this evening for Orange County
     Inland Areas-Riverside County Mountains-Including The San
     Jacinto Ranger District Of The San Bernardino National
     Forest-San Bernardino County Mountains-Including The
     Mountain Top And Front Country Ranger Districts Of The San
     Bernardino National Forest-San Bernardino and Riverside
     County Valleys  -The Inland Empire-San Diego County Coastal
     Areas-San Diego County Inland Valleys-San Diego County
     Mountains-Including The Palomar And Descanso Ranger
     Districts of the Cleveland National Forest-San Gorgonio
     Pass Near Banning-Santa Ana Mountains-Including The Trabuco
     Ranger District of the Cleveland National Forest.

PZ...NONE.

&&

$$

PUBLIC/FIRE WEATHER...17
AVIATION/MARINE...SS



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