Area Forecast Discussion
Issued by NWS Eureka, CA

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FXUS66 KEKA 231116

National Weather Service Eureka CA
416 AM PDT Mon Oct 23 2017

.SYNOPSIS...Strong high pressure will bring warm and dry weather to
northwest California this week.


.DISCUSSION...Strong ridging across the north eastern
Pacific Ocean will bring abrupt warming and plummeting afternoon
humidity today and Tuesday. Many areas, including the coast, will be
10 to 15, some areas 20, degrees above normal today. The interior
will reach the 80s and low 90s and coastal areas will reach the
upper 60s and 70s. Some patchy coastal and valley fog will will
dissipate through the morning hours but the dry airmass in
conjunction with a thermal trough over the coast will result in
mostly clear skies. The thermal trough will also bring enhanced
northeasterly winds the next several days. Mendocino County could
see some breezy conditions this afternoon on ridgetops, however,
the strongest 925mb winds look to be farther south across Lake,
Napa, and Sonoma counties. Warm and dry weather will persist
through the rest of the week, although, interior temperatures will
gradually decrease as the upper ridge breaks down and 500mb
heights fall. /KML


.AVIATION...Brief IFR in patchy ground fog has been in and
out of KCEC through the night. Otherwise VFR will continue
to prevail today and tonight as an offshore flow develops.
Coastal terminals, especially KCEC, will probably see shallow
ground fog again tonight as winds go light.


.MARINE...A west-northwest swell will continue to subside
through today. Short period northerly wind waves will also
increase today and tonight as northerly winds strengthen offshore.
The net result will be combined seas around 10 ft or higher.
Seas may fall slightly on Tue, before winds ramp up again on Wed.

A new west-northwest swell will build to 4 to 6 ft with periods
near 18 seconds today. This swell may pose a slight risk of
sneaker waves from late morning through early this evening. Short
period northerly wind waves along with a decaying shorter period
swell may mitigate the sneaker wave threat today.  Even though
the threat appears low due to the combined sea state, a beach
hazard statement has been hoisted to provide beach goers with
a heads up.


CA...Beach Hazards Statement from 11 AM PDT this morning through this
     evening for CAZ101-103-104-109.

NORTHWEST CALIFORNIA COASTAL WATERS...Small Craft Advisory until 3 AM PDT Tuesday for PZZ450-455.

     Small Craft Advisory until 3 PM PDT Tuesday for PZZ470-475.



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