Area Forecast Discussion
Issued by NWS Eureka, CA

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627
FXUS66 KEKA 162243
AFDEKA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
243 PM PST Sat Dec 16 2017

.SYNOPSIS...High pressure will bring dry weather through Monday.
A cold front will bring a chance for rain by Tuesday night
followed by another long stretch of dry weather.

&&

.DISCUSSION...Breezy north winds will gradually diminish behind
an exiting frontal boundary tonight with generally cooler
overnight temperatures expected for the remainder of the weekend.
Dry weather conditions will persist on Monday as high pressure
shifts over the Pacific Northwest. Some high level clouds may
spill over the ridge from time to time.

A cold front will approach from the NW on Tuesday bringing rain
to mainly Del Norte county by mid to late afternoon. The bulk of
rain for the rest of the area will most likely arrive late Tuesday
afternoon into the evening hours.

Snow levels will fall behind the front late Tuesday night and
some snow showers will be possible for the higher terrain through
mid day Wednesday. Overall, the precipitation amounts are not
looking sufficient to warrant an advisory. The best chances for
precipitation will be north of Cape Mendocino with lower chances
across Mendocino and eastern Trinity counties.

Beyond that, the GFS, ECMWF, GEM and ensembles signal strong upper
level ridging offshore with a broad large scale trough to our
east. This will mean prolonged dry weather through the end of the
week and next weekend. The ECMWF does indicate westerly flow
breaking through and undercutting the large scale block Sunday or
Monday. Forecast models beyond that are not looking very
promising for wet weather for the following week either. December
is usually the wettest month of the season, however this December
will likely go down as one of the driest on record.

&&

.AVIATION...Windy conditions will continue for coastal and ridge top
terminals this afternoon and into the evening and then weaken for
the overnight hours. VFR conditions will prevail for the forecast
period.

&&

.MARINE...The ASCAT pass from this morning confirmed that winds are
gradually weakening as the southern waters had northerly gales while
the northern waters were just below gale force. Look for these winds
to continue to weaken tonight and into Sunday while seas gradually
subside due to high pressure building over the region. This will
lead to lighter winds starting Monday and then lasting through mid
week while a northwesterly swell passes through.

&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...None.

NORTHWEST CALIFORNIA COASTAL WATERS...
Small Craft Advisory until 3 AM PST Sunday for PZZ450-455.
Gale Warning until 10 PM PST this evening for PZZ470.
Hazardous Seas Warning until 3 AM PST Sunday for PZZ455.
Gale Warning until 9 AM PST Sunday for PZZ475.

&&

$$

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