Area Forecast Discussion
Issued by NWS Eureka, CA

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FXUS66 KEKA 312305

National Weather Service Eureka CA
405 PM PDT WED AUG 31 2016

.SYNOPSIS...Mild temperatures will continue across the interior through
the end of the week, with a gradual warmup expected through the
first half of next week. Coastal conditions will remain fairly
typical, with perhaps a few bouts of drizzle today through late


.DISCUSSION...Comfortably warm and benign conditions continue to
prevail across northwest California today as an upper level low
pressure continues to slide eastward through the area. As of mid
afternoon, the axis of the first in a series of upper level
shortwaves has moved east of the area, and a weak cold front has
begun to push onto the coast. This surge of modestly cool, moist
onshore flow has resulted in an uptick of low level clouds along
the Redwood and portions of the Mendocino coastlines,
particularly in the coastal hills where topography is enhancing
lift. Some areas may even see a little bit of drizzle this
evening and overnight, particularly along the north slopes of the
southwestern Humboldt mountains where the ridges are oriented
nearly perpendicular to the northwest flow. Overnight tonight, a
more "classic" marine stratus layer is expected to move back into
coastal areas, resulting in more fog in places. For tomorrow,
expect similarly mild interior temperatures and coastal clouds
that will improve gradually through the late morning and early
afternoon. Another shortwave trough and weak front will move
through the area tomorrow evening and overnight, again potentially
resulting in a bit of drizzle along the coast under a similar
scenario as what is being observed right now.

Beyond tomorrow night, the story for the weekend and early next
week will be mild temperatures that very gradually warm back to
near or slightly above normal. The broad upper trough that brought
us our mild temperatures will very slowly move east through this
period while an upper ridge builds across the east Pacific,
allowing temperatures to incrementally increase through the week.
Precipitation chances will be minimal to zero through this period
aside from isolated instances of coastal drizzle. Meanwhile, the
marine layer will begin to compress as the upper ridge exerts
greater influence over the region, and stratus will likely not
travel particularly far into coastal river valleys. Not only this,
but increasing nocturnal northeasterly flow may cause offshore
stratus coverage to reduce in some areas, particularly in the
vicinity of Brookings, OR, although a southerly flow reversal
along the coast may be enough to bring stratus into Crescent City
each morning regardless. /BRC


.AVIATION...Low ceilings will prevail at KCEC, where ceilings in
around 1200 feet with temporary reductions to 300 feet will be
common through tomorrow morning. At KACV, although they`re
currently VFR, this terminal is on the edge of the lower ceilings
based on the latest visible satellite imagery and surrounding
observations, so will leave the TAF for this location as is, with
ceilings in the MVFR range this evening then dropping overnight.
Farther south at KUKI, gusty afternoon winds will subside after
sunset, with light winds and VFR conditions expected. /PD


.MARINE...Light winds with seas less than 5 feet will prevail.
Winds should begin to increase from south to north across the
outer waters over the next few days, as a ridge of high pressure
to our west tries to build across the region. Small craft
advisories will probably be needed over the next 24 hours. /PD


.FIRE WEATHER...Very few fire weather concerns are expected
through Friday as mild temperatures, moderate to high humidity,
and generally light to periodically breezy onshore winds will
prevail. By Friday night, though, nocturnal offshore winds will
return, likely with some stronger gusts along the higher ridges in
the typical areas of Del Norte and northern Humboldt counties.
This will continue through next week, with decreasing RH
recoveries in these areas as well. Little to no chances for
thunderstorms exist for the foreseeable future. /BRC


.EKA Watches/Warnings/Advisories...


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