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Area Forecast Discussion (AFD)

Issued by San Francisco Bay Area, CA (MTR)

FXUS66 KMTR 230957

Area Forecast Discussion
National Weather Service San Francisco Bay Area
257 AM PDT Sun Jun 23 2019

.SYNOPSIS...High pressure will continue to produce above average
temperatures through the remainder of the weekend, especially
inland. A distinct cooling trend is then forecast from Monday 
through Wednesday, resulting in much cooler temperatures by the 
middle of next week. 


.DISCUSSION...As of 2:57 AM PDT Sunday...The marine layer has 
compressed to under 1000 feet, per the Fort Ord profiler, and 
satellite imagery shows coastal low clouds from about San 
Francisco south, and locally extending into the Salinas Valley. 
Current surface observations show patchy fog mainly around the 
Monterey Bay, but hazy conditions are occurring at SFO and STS 
over the last hour. 

High temperatures today are expected to be similar to those on
Saturday, with 60s to lower 70s at the coast, to the lower to
middle 90s well inland. The upper level ridge will start to break
down on Monday as an upper trough off the coast of British 
Columbia begins to move to the southeast. This will ramp up the 
onshore flow by Monday afternoon, along with an increase in 
coastal low clouds, and a cooling trend will begin. This cooling
trend will continue through midweek, and by Wednesday, high 
temperatures are forecast to be as much as 20 degrees cooler than
those expected today. Temperatures are then expected to rebound a
bit late next week, but still remain at least slightly below 
normal as a broad upper trough remains near the West Coast. High
pressure to rebuild over the west by next weekend for warmer
temperatures once again. 

&& of 10:40 PM PDT Saturday...Northerly gradient 
continues to dominate over the east-west gradient. This will keep
VFR conditions in the SFO Bay Area through Sunday. Low clouds 
have hung around MRY Bay today and should spread into MRY and SNS 
during the night.

Vicinity of KSFO...VFR. Northwest winds around 15 kt decreasing
after 04Z. 

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...IFR after 08-09Z. Clearing expected after
16Z at MRY and 17Z at SNS.  

&& of 2:07 AM PDT Sunday...High pressure over the 
eastern Pacific and a trough over inland California will maintain 
gusty northwesterly winds over the northern outer waters. Expect 
generally light to moderate winds elsewhere. Winds will diminish 
across the waters Tuesday as high pressure weakens and low 
pressure sets up off the Pacific Northwest.


     .Tday...SCA...Pt Arena to Pigeon Pt 10-60 nm
             SCA...Pt Arena to Pt Reyes 0-10 nm until 9 AM
             SCA...Pt Arena to Pt Reyes 0-10 nm from 5 PM




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