Area Forecast Discussion
Issued by NWS Eureka, CA

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FXUS66 KEKA 242306

National Weather Service Eureka CA
406 PM PDT Sun Sep 24 2017

.SYNOPSIS...Warm, sunny  dry conditions are expected throughout
the area Monday for the foreseeable future, particularly Monday
through Wednesday.


.DISCUSSION...After a pleasantly warm day today temperatures will
continue to rise as high pressure aloft slowly builds across the
west coast. Overnight temperatures will be quite cool across the
interior tonight once again, although likely slightly warmer than
they were Saturday night. As a result, Hayfork Valley may see
some more patchy frost early Monday morning, but this should be
somewhat localized. This should be the last of the frost, as
afternoon temperatures are expected to soar into the mid 80s to
low 90s on Monday, and even warmer Tuesday and Wednesday. While
the valleys will continue to see efficient radiative cooling and
cool air drainage, temperatures will finally be too warm for frost
overnight. While the warmest days throughout the interior are
expected to occur Tuesday and Wednesday, above normal temperatures
are expected to linger through the end of the week.

Along the coast, mostly sunny skies will continue to persist as
nocturnal offshore flow gradually increases through the week.
Temperatures will also steadily warm as the inland thermal trough
gradually shifts offshore. The warmest two days are expected to be
Tuesday and Wednesday thanks to this and a combination of
persistent northeast winds, and as a result temperatures will
likely rise well into the 70s. The marine layer should regain
control of the coast Thursday through the end of the week, cooling
coastal temperatures back down to near normal. /BRC


.AVIATION...Generally light winds will persist today with
Northwest California under an upper level ridge. Most areas will
remain VFR though some IFR or LIFR clouds may develop north of
Cape Mendocino tonight as temperatures cool. Easterly winds aloft
in southern Mendocino County could bring weak wind shear issues at
UKI but uncertainty is too high to include in the TAF at this
time. Better chances for wind shear at all the terminals will
occur Tuesday night when strong easterly winds at 1500-2500 feet
develop. /RPA


.MARINE...An upper level ridge over the west coast will allow
surface high pressure to build over the eastern Pacific Ocean
while a thermal trough intensifies over the interior portion of
California. Northerly winds will continue to increase through
Monday afternoon with near gale conditions expected in the two
outer water zones. Some gusts to over small craft criteria will be
possible in the two inner water zones Monday afternoon, along
with the potential for some of the steep seas to propagate into
the area. Have opted to not expand the small craft advisories into
the inner waters for Monday afternoon because winds have remained
fairly light at the buoys today possibly indicating that winds
won`t be as strong as the models are indicating for tomorrow.

Winds and seas will diminish substantially on Wednesday as the
thermal trough moves off the coast. Winds will likely turn out of
the south mid to late week but remain generally light. /RPA


.FIRE WEATHER...A warming and drying trend that began today will
continue through the week, in addition to increasing northeasterly
winds. Temperatures Monday will increase to slightly above
normal, and well above normal Tuesday and Wednesday, which will
also result in low afternoon humidity. Meanwhile, offshore winds
will steadily increase each night, with the strongest winds
expected Monday night through early Wednesday. These winds, which
are typically nocturnal in nature, will likely persist through the
day Tuesday, particularly along exposed ridges across Mendocino,
Lake, and eastern Trinity counties. This will also result in
moderate to poor overnight recoveries. Periods of critical fire
weather will be possible during this time frame.


NORTHWEST CALIFORNIA COASTAL WATERS...Small Craft Advisory until 9 AM PDT Wednesday for PZZ470-475.



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