000 
fxus66 kmtr 222157 
afdmtr 


Area forecast discussion 
National Weather Service San Francisco Bay area 
157 PM PST Tue Jan 22 2019 


Synopsis...building high pressure along the West Coast will result 
in a gradual warming trend through Saturday with mainly clear sky 
conditions. The dry weather pattern looks to last through the end of 
the month with seasonably mild days and cool nights. 


&& 


Discussion...as of 01:56 PM PST Tuesday...a few high clouds 
continue to stream over the region with temperatures generally in 
the middle 50s to lower 60s. Mainly clear conditions are forecast 
to persist tonight with temperatures once again cooling into the 
middle 30s to lower 40s (middle 50s around san francisco). Cannot 
rule out patchy frost as well, yet widespread coverage is unlikely 
given the dry air mass in place. This too should limit widespread 
fog development. 


A gradual warming trend is forecast through late week as high 
pressure builds along the West Coast and an increase in 850mb 
temperatures. Weak offshore flow is also forecast to develop late in 
the week which will help bring temperatures into the 60s region-wide 
while lower 70s will be possible across the central coast, 
especially inland. 


Temperatures look to moderate slightly early next week back to near 
seasonal averages on the ridge over the region shifts back out over 
the Pacific. Overall, only expecting minor day-to-day changes with 
mainly clear sky conditions and dry weather. The longer range models 
maintain these dry conditions through at least the end of the month 
as well. 


&& 


Aviation...as of 09:25 am PST Tuesday...for 18z tafs. VFR 
conditions as northerly flow is forecast to persist, keeping lower 
levels of the atmosphere dry. High clouds overhead 20,000-25,000 
feet. Winds will remain generally light through the period. 


Vicinity of ksfo...VFR through the period with high clouds. Light 
winds generally less than 10 kt. 


Sfo bridge approach...similar to sfo. 


Monterey Bay terminals...VFR with high clouds. Light winds. 


&& 


Marine...as of 09:02 am PST Tuesday...northerly winds will 
gradually diminish today across the waters as high pressure builds 
over the eastern Pacific. High pressure will remain in place 
through the week resulting in light winds. A series of light to 
moderate northwest swells is forecast throughout the week. 


&& 


Mtr watches/warnings/advisories... 
... 


&& 


$$ 


Public forecast: rgass 
aviation: as 
marine: as 


Visit US at www.Weather.Gov/sanfrancisco 



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