Area Forecast Discussion
Issued by NWS San Francisco Bay Area, CA

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FXUS66 KMTR 211130

Area Forecast Discussion
National Weather Service San Francisco Bay Area
430 AM PDT Sat Jul 21 2018

.SYNOPSIS...Dry conditions and seasonably warm daytime
temperatures will continue through the weekend with marine air
keeping conditions cooler near the coast. A more robust warming
trend is then expected later next week, especially across inland
areas, as as strong ridge of high pressure builds over the region.

&& of 3:18 AM PDT Saturday...Current satellite
imagery is nearly a carbon copy of yesterday at this time with
coastal stratus extending into the bays and inland valleys. The
marine layer depth is currently 1600 feet per the Fort Ord
profiler and the surface pressure gradient remains onshore with
2.4 mb from SFO to SAC. Expect high temperatures today to be
similar to those on Friday with 60s to mid 70s at the coast, to
the 70s and 80s inland, with warmest well-inland areas in the
lower to mid 90s. Similar conditions are expected on Sunday with
coastal stratus/fog in the morning, clearing by afternoon.

High pressure is forecast to rebuild into southern California from
the desert southwest. This will usher in a warming trend for
California by the middle of the week with high temperatures once
again exceeding the century mark in the hottest well-inland
locations in southern Monterey and San Benito counties,
especially after midweek. Near-coastal locations are expected to
stay cooler thanks to a continued onshore flow. The hottest areas
will be farther to the east and south, closer to the ridge axis,
thus for now, no heat products are in effect. Heat advisories may
be needed as we get closer to the event.


.AVIATION...As of 04:30 AM PDT Saturday...for 12z tafs. The
marine layer is currently just over 1,500 ft. Conditions range
from VFR to LIFR with cigs between 400 and 600 ft. LIFR/IFR
conditions are expected to continue through 16z-18z with VFR
conditions prevailing at locations currently not experiencing low
clouds. Once stratus dissipates later this morning, VFR is
expected through tonight when low cigs are forecast to return.
Generally light onshore winds this afternoon 10-15 kt with locally
higher gusts possible.

Vicinity of KSFO...VFR conditions expected through the period.
Slight chance remains of IFR cigs drifting over the airport
through this morning, but confidence is low. Light westerly winds
this morning increasing to around 15 kt this afternoon.

SFO Bridge Approach...Low clouds are expected to develop over the
South San Francisco Bay. This may impede visuals on the approach.
Stratus forecast to dissipate at around 17z-18z.

Monterey Bay Terminals...LIFR/IFR cigs through about 17z then VFR
through late this afternoon. Low cigs to return early this
evening. Light winds through the period.

&& of 2:12 AM PDT Saturday...Generally light winds will
continue across the coastal waters through the weekend.
Northwesterly winds are then forecast to increase through much of
the coming week. Long period southerly swell will arrive early
next week.


     .Tday...SCA...SF Bay from 2 PM




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