Area Forecast Discussion
Issued by NWS San Diego, CA

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000
FXUS66 KSGX 082204
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
200 PM PST Fri Dec 8 2017

.SYNOPSIS...
Somewhat lighter winds will continue through tonight under mostly
clear skies. Winds will increase again Saturday and peak Sunday
morning due to more strengthening of the high pressure system over
the Great Basin, though they will not be as strong as winds from
Thursday. Overall, a strong ridge of high pressure will keep skies
mostly clear through next week with low humidity and occasional east
to northeast winds. Temperatures will be well above normal for
December.

&&

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

Skies were mostly sunny early this afternoon, except for some areas
of smoke. Most of the gusts have been below 40 MPH early this
afternoon. The sea breeze did bring some cooling at the coast, but
elsewhere at low elevations temperatures were in the mid 70s to mid
80s.

A strong ridge of high pressure was aligned north-south along the
West Coast, with a deep trough of low pressure from the Great Lakes
to Texas. Only minor changes in the position of the high will occur
for the next week though winds will vary based on other factors,
including the surface pressure gradients, winds aloft and upper lows
periodically to our south. Surface winds will increase Saturday,
peaking Sunday as the mountain crest inversion strengthens again,
even though only moderate increases in the MSLP gradients will
occur. Local WRF shows gust potential around 50-55 MPH Saturday and
55-65 MPH Sunday mainly in San Diego County in the mountains and
western foothills. Easterly winds will likely reach parts of the
coast Sunday, especially in northern San Diego County. The high wind
warning has been extended in the mountains and inland valleys of San
Diego County through 4 PM Sunday, but other areas will expire at 4
PM today.

Winds will decrease quite a bit Sunday night and Monday, though
offshore flow will continue in most areas most of next week. There
could be sea breezes near the coast at times in the afternoons. Some
model runs have shown increases in the offshore flow again around
Thursday or Friday. Overall, temperatures will be above normal,
especially daytime temperatures with highs generally in the upper
70s to lower 80s through next week. Due to low humidities, wind
sheltered locations will be cool at night, with mostly 30s and 40s
except 50s where winds are more persistent and a few places along
the immediate coast.

&&

.AVIATION...
082053Z...NE to E winds 20-30 kt with gusts to 40 kt in the wind
prone passes and canyons and on the coastal mountain slopes and
foothills will create MOD-STG UDDFS/LLWS over and W or SW of the
mountains through Saturday morning. Strong surface winds at KONT,
KSNA, KCRQ and KSAN not expected. Otherwise, gradually increasing
clouds AOA 20000 ft MSL and P6SM vis through Saturday morning.

&&

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

&&

.FIRE WEATHER...
Winds will generally be lighter through tonight with even a sea
breeze near the coast this afternoon.  Offshore flow will increase
again Saturday and peak Sunday morning with winds generally 20-35
MPH with gusts 45-65 MPH and minimum humidities locally 5% or less.
Winds will decrease substantially late Sunday/Sunday night.

The Red Flag Warning remains in effect until 8 pm Sunday for most
areas, except coastal Orange County where it expires at 8 pm
Saturday.

&&

.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 Sunday for San Diego County
     Mountains-San Diego County Valleys.

     Red Flag Warning until 8 PM PST Sunday 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.

     High Wind Warning until 4 PM PST this afternoon for Riverside
     County Mountains-San Bernardino County Mountains-San
     Bernardino and Riverside County Valleys-The Inland Empire-
     San Gorgonio Pass Near Banning-Santa Ana Mountains and
     Foothills.

     Red Flag Warning until 8 PM PST Saturday for Orange County
     Coastal Areas.

PZ...NONE.

&&

$$

PUBLIC/FIRE WEATHER...Maxwell
AVIATION/MARINE...Harrison



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