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Area Forecast Discussion (AFD)

Issued by San Francisco Bay Area, CA (MTR)

FXUS66 KMTR 232111

Area Forecast Discussion
National Weather Service San Francisco Bay Area
211 PM PDT Sun Jun 23 2019

.SYNOPSIS...A cooling trend will slowly take hold of the region 
beginning Monday and remain for the better part of the week. Look
for more morning low clouds and cooler temperatures as a result. A
little coastal drizzle is possible with this pattern by midweek.

&& of 02:11 PM PDT Sunday...Coastal fog is finally 
eroding along portions of the Bay Area coast. Although most of 
Monterey, Santa Cruz, and SF coasts continue to have haze or low 
clouds. The remainder of the Bay Area continues to be warm today, 
having reached the 80s and low 90s already. There will likely be 
another degree or two added to these reading, but should cap soon.

Synoptically speaking high pressure over the region will slowly
shift to the east over the next 24 to 48 hours as an upper level
trough moves into the Pacific Northwest and digs toward
California. This will bring a two fold change. One, it will deepen
the marine layer over the coming days. Therefore look for low
clouds instead of at the surface fog. By the time we get to
Wednesday into Thursday, the low clouds could make a significant
push inland. The marine layer could reach into the 3000 foot level
by mid to late week. Two, the onshore push and maritime airmass,
out of the Northwest, will bring a cooling trend to the region.
While the cool down will be nearly undetectable to people on 
Monday, by Tuesday it should be noticeable. By mid to late week, 
it looks like we could be 5 to 15 degrees below normal, depending 
upon location.

Looking longer term, models are showing a saggy trough hanging
around through next weekend. Temps may rebound a hair after the
midweek cool down, but should remain below normal through next
weekend. Looks like a weak ridge may have a shot at building by
the early part of next week as we head into July.

All in all, nothing to write home about for the next 5-7 days.
Typical Bay Area summertime weather with standard fluctuations 
around what is known as "normal".

&& of 10:30 AM PDT Sunday...For 18z TAFs. VFR 
conditions expected through this evening for most terminals with 
increasing onshore winds. Low clouds and potential fog will return
to the Monterey Bay terminals late this evening with more 
widespread low clouds developing inland around the Bay Area by 
Monday morning. 

Vicinity of KSFO...VFR. Light winds persist through the morning 
increasing to around 15 kt after 20z-21z. 

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...VFR conditions with increasing onshore
winds after 20z-21z. Low clouds and reduced visibility return 
late this evening and will likely persist into Monday morning. 

&& of 01:28 PM PDT Sunday...High pressure over the
eastern Pacific and a trough over inland California will maintain
gusty northwesterly winds over the northern outer waters through
Monday. 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.


     .Tngt...SCA...Pt Arena to Pigeon Pt 10-60 nm
             SCA...Pt Arena to Pt Reyes 0-10 nm




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