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Area forecast discussion 
National Weather Service Eureka California
340 PM PDT Sat Aug 30 2014

Synopsis...a passing disturbance will bring cool temperatures
tonight to interior northwest California. This disturbance will give way to
an area of high pressure on Sunday...bringing a warmer trend to the
region through Tuesday. At this point...Labor Day looks to be the
warmest day of the next few.

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Discussion...an upper trough slicing across northwest cal today will
bring cooling temperatures tonight across the interior. Temperatures are
expected to drop into the 40s and low 50s under generally clear
skies and a drying air mass. Coastal areas will remain consistent
due to the marine air. This trough will keep the marine layer
rather deep in the early night allowing for clouds to funnel up
the Eel River valley and other large coastal valley features. An
upper ridge building in behind this trough Sunday morning will
Peel the clouds out of the coastal valleys early in the morning,
confining them to the coast until middle morning. This ridge will
bring warming temperatures and a drying air mass to nwca for Sunday
through Tuesday. Look for inland temperatures to increase by 5 to 10
degrees by Monday over today. There is a chance with light
northerly winds on Monday, the coast could spike into the middle to
upper 70s, depending upon location. With warm temperatures and the drying
air mass, humidity values will plummet into single and teen digits
by Monday afternoon.

By midweek another upper trough will press toward the area,
bringing with it the remnants of tropical system Marie. Models
remain uncertain as to how this trough will develop and whether a
cut off low will form on the tail of the broad trough. There is
the slightest chance that a cut off low could develop with
lingering moisture from Marie wrapping around it, which could
bring another threat of thunderstorms to nwca late in the week.
Uncertainty is high with regards to timing, placement, and
strength. As such, have left probability of precipitation below mentionable, but did put
some "higher" probability of precipitation over the mountains for late week. Will watch to
see how this develops through the week. Bfg

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Aviation...a high and weak marine inversion will likely persist
through the evening with perhaps areas of MVFR cloud layers near
the coastline. A slightly stronger and lower marine inversion will
likely develop on Sunday. This will result in a shallower layer as
well as better chances for lower ceilings near 1000 feet early Sunday
morning. North-northwesterly winds should mix out the borderline IFR conds
Sunday afternoon. No significant inland intrusion of stratus is
expected through the weekend and most sites away from the coast
will continue to see VFR with breezy afternoon conds. However
smoke from wild fires in Siskiyou County may hamper visibilities near
Trinity Center and perhaps around Orleans and Gasquet.

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Marine...high pressure will continue to build toward the West
Coast through the weekend resulting in strengthening northerly
winds and building short period seas. An advisory for small craft
is currently in effect for pzz475. Thermal low pressure will build
along the northern California coast on Monday and northerly gusts of
35-40 knots will be possible in pzz470. Duration and coverage of gale
force winds look marginal and no highlights have been hoisted.

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Eka watches/warnings/advisories...
California...none.
Northwest California coastal waters...Small Craft Advisory until 3 PM PDT Tuesday pzz475.

&&

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