000 
fxus66 kmtr 141611 
afdmtr 


Area forecast discussion 
National Weather Service San Francisco Bay area 
911 am PDT Tue Aug 14 2018 


Synopsis...temperatures will be near to slightly below seasonal 
averages through midweek as a modest marine layer and onshore flow 
persist over the region. High pressure is then forecast to rebuild 
toward the West Coast late in the week and into next week bringing 
warmer temperatures to the interior. 


&& 


Discussion...as of 09:10 am PDT Tuesday...satellite imagery this 
morning shows extensive cloud cover for this time of year with a 
marine layer at around 1,500 feet in depth. Thus, low clouds 
spread well inland into just about all valley locations overnight 
with patchy drizzle reported along many coastal areas as well as 
into the East Bay hills. Aloft, high level clouds can be seen as 
well as mid/upper level moisture advects northward over the 
region. Any convection at this time appears to be across the 
interior portion of the state. Given the cloud cover, have lowered 
temperatures by a few degrees for locations around the greater 
San Francisco Bay area. Otherwise, the rest of the forecast 
appears on track this morning. For additional details, please see 
the previous forecast discussion below. 


&& 


Previous discussion...as of 3:41 am PDT Tuesday...average temperatures 
Monday were a couple to a few degrees below August 13 normals at 
the coast, around the bays, and Inland. Sea surface temperatures 
at the buoys are presently 54 to 56 (except Half Moon bay's 59 SST 
appears a bit mild in comparison. Half Moon bay's morning lows 
back through August 1st have been chillier than the buoy's sea sfc 
temp) at any rate onshore breezes continue this morning, it's 
chilliest ocean side along with patches of drizzle while mostly 
cloudy skies extend well inland from the coast. Clearing back to 
near the immediate coast will return by afternoon. Onshore breezes 
will help keep daytime temperatures tempered at or below normal 
maximum temperatures today and likely again Wednesday. 


A warming trend will commence later in the week as the high pressure 
center over the southwestern U.S. Eventually returns and rebuilds 
over California. Temperatures will then warm back up to normal to 
a few degrees above mid August normals with 80s/90s maybe 100 degree 
mark inland, but sea-breezes should keep seasonably cool temperatures 
going along the coast, over the weekend. 


&& 


Aviation...as of 4:45 am PDT Tuesday...a deeper marine layer has 
allowed stratus to spread farther inland today. Stratus models 
and numerical models indicate a late burnoff in the sfo Bay area 
with burnoff time at sfo between 18z and 19z. 


The hrrr smoke forecast shows smoke aloft spreading into the area 
today creating reduced slant-range visibilities. 


Vicinity of ksfo...MVFR/IFR cigs through 18z. West winds gusting 
to 25 kt after 20z. 


Sfo bridge approach...MVFR/IFR cigs through 19z. 


Monterey Bay terminals...IFR/LIFR cigs through 18z at sns and at 
least 19z at mry. 


&& 


Marine...as of 09:10 am PDT Tuesday...light to locally moderate 
winds will continue this afternoon over the coastal waters. The 
northwest swell is forecast to remain light to moderate this week, 
while the southerly swell will gradually increase through the 
week and into the weekend. 


&& 


Mtr watches/warnings/advisories... 
... Bay from 2 PM 


&& 


$$ 


Public forecast: rgass/canepa 
aviation: west pi 
marine: Rowe 


Visit US at www.Weather.Gov/sanfrancisco 



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