fxus66 ksgx 232143 cca 

Area forecast discussion...corrected 
National Weather Service San Diego California 
243 PM PDT Tue Oct 23 2018 

a weak trough will bring seasonal weather through Wednesday. The 
weather will turn much warmer Thursday through Saturday as high 
pressure aloft builds over the southwest. The marine layer will 
become shallower and the surface winds will turn weakly offshore. 
Sunday and Monday will not be quite as hot west of the mountains as 
the ridge weakens and a Pacific trough increases the low level 
onshore flow. 


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

Low clouds surged into coastal San Diego County this afternoon, 
which didn't occur Monday afternoon. These marine layer clouds may 
scatter out for a time this afternoon or evening, but then reform 
and move back inland overnight. The low clouds probably won't spread 
as far inland tomorrow morning as heights rise from 574 dm this 
morning to 578 dm Wednesday morning. There will be even less low 
cloud cover Thursday morning as heights rise to 582 dm and high 
pressure aloft gains more traction. 

A 589 dm high over the eastern Pacific will build over Southern 
California Friday and Saturday bringing hot days and weak 
offshore flow. The offshore winds will not be very strong, but the 
easterly downslope flow will help some of the valleys to warm 
into the 90s. Coastal highs will be in the 80s, and mountain highs 
will range from the mid 80s at 4000 feet to the mid 60s above 
9000 feet. The high deserts will be in the mid 80s, and the low 
deserts in the mid 90s. 

The high will start to break down Sunday as a trough of low pressure 
moves inland to the north. This trough will bring cooler weather 
early next week with lower heights and somewhat stronger onshore 

The long range models this morning forecast a closed upper low 
west of northern baja Monday morning, which is a relatively new 
development. Right now it is projected to bring upper level moisture 
and high clouds into socal next Monday and Tuesday. 


232030z...coast/valleys...stratus is hugging the coast this 
afternoon and should spread across the coastal terminals 00-04z. The 
marine layer will be shallower tonight resulting in somewhat lower 
bases and a greater potential for fog at the terminals than the 
previous night. Expect low clouds/patchy fog to impact portions of 
the inland Empire including kont by 12z. Will see bases 700-1100 ft 
mean sea level with tops 1200-1500 ft mean sea level. Expect patchy fog to result in 
visibilities of 1-4sm at times with mountaintops obscured. Will see 
the ceilings scatter out around 16z. 

Deserts/mountains...VFR conditions with clear skies and light winds 
through the period. 


no hazardous marine weather is expected through Saturday. 


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


Sgx watches/warnings/advisories... 


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