000 
fxus66 ksgx 251628 
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Area forecast discussion 
National Weather Service San Diego California 
920 am PDT Fri may 25 2018 


Synopsis... 
a low pressure system moving inland across California will continue 
cooler than average weather through Saturday. The marine layer will 
remain very deep with patchy night and morning drizzle west of the 
mountains. From Sunday through Tuesday the weather will turn warmer 
and the marine layer shallower as the trough moves east. 


&& 


Discussion...for extreme southwestern California including Orange... 
San Diego...western Riverside and southwestern San Bernardino 
counties... 


The cloud layer is much thinner and less uniform this morning 
compared to yesterday, and the 8 am visible satellite image showed 
breaks in the overcast west of the mountains. The marine layer was 
still very deep though, around 5300 feet, and stratocumulus have 
already formed in those areas that saw the early morning clearing. 


Rain and drizzle this morning was confined to the foothills of the 
sbd and Ora County mountains. The Crestline area in San Bernardino 
was the focus of the greatest precip this morning with 0.12" at 
Cable Canyon and 0.11" at Crestline ridge. Clouds will remain banked 
up against the Lower Mountain slopes in this area into the 
afternoon. Elsewhere west of the mountains, skies will be partly to 
mostly cloudy, and sunny in the higher mountains and the deserts. 


A deep trough over the west with a 565 dm cold core was centered 
near sfo this morning. Shortwaves will round the base of this trough 
through Saturday. The main impulse will track across socal Saturday 
morning and that is when more areas of light rain or drizzle are 
possible along and west of the mountains. The higher mtns and 
deserts will remain generally sunny, but it will be windy in the 
afternoon and evening when onshore pressure gradients approach 10 
mb and support winds of 15-30 mph with gusts of 40-50 mph. 


The trough moves inland Sunday with higher pressure building over 
the southwest in the afternoon for better coastal clearing, a 
shallowing marine layer, and a warmer day in all areas. This trend 
will continue early next week with further warming and a shallower 
marine layer Monday through Wednesday. 


On Thursday and Friday the long range progs forecast a trough to 
deepen along the West Coast for cooler weather, a deeper marine 
layer and gusty mountain and desert winds. 


&& 


Aviation... 
251530z..coast/valleys/coastal mountain slopes...low clouds with 
bases mostly between 3500 and 4500 ft mean sea level and mountain obscurations 
will gradually scatter out by midday. Low clouds redeveloping this 
evening with bases near 2500-3500 feet mean sea level and tops growing to 6000 
feet overnight. Patchy drizzle overnight with local cigs down to 
about 1800 feet. Scatter out Saturday most areas between 18-20z. 


Mountain crests/Desert Mountain slopes/deserts...mostly clear today 
through Saturday with a few cu over mountain crests. West winds with 
sfc gusts 25-35 kt will produce localized low level wind shear with moderate uddfs over 
the mountain crests, and in the passes through Saturday. 


&& 


Marine... 
west northwest winds with a few gusts exceeding 20 knots are 
expected in the outer waters through Saturday night, mainly during 
afternoons and evenings. Otherwise, no hazardous marine weather is 
expected Sunday through Tuesday. 


&& 


Beaches... 
a long-period south swell will continue to produce elevated surf and 
strong rip currents through this evening. Highest surf is expected 
in northern San Diego County and Orange County. Check the surf zone 
forecast and the beach hazards statement for details. 


&& 


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


&& 


Sgx watches/warnings/advisories... 
California...beach hazards statement through this afternoon for Orange County 
coastal areas-San Diego County coastal areas. 


Pz...none. 


&& 



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