Weather Service Report


099 
FXUS66 KEKA 052245
AFDEKA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
245 PM PST Mon Dec 5 2016

.SYNOPSIS...A cold front will move across the region this evening
and early Tuesday morning. Showers will spread north to south
tonight with snow occurring across higher terrain tonight and
early Tuesday morning. Cooler temperatures will occur Tuesday and
Wednesday. Frost is likely near coastal areas Wednesday morning. 

&&

.DISCUSSION...A cold front will move across the region this evening
and early Tuesday morning. Showers will spread north to south
tonight with snow occurring across higher terrain tonight and
early Tuesday morning. A winter weather advisory is in effect
across Del Norte Interior overnight and early Tuesday morning.
Cooler temperatures will occur Tuesday and Wednesday. Frost is
likely near coastal areas Wednesday morning. A high pressure
ridge will briefly build across the region Tuesday in the wake of
the cold front producing dry conditions and partly cloudy skies
allowing for radiational cooling early Wednesday morning and lower
temperatures.

A stronger, warmer and more moist cold front will move across the
region producing light to moderate rain Wednesday night through
Thursday night. The rain chances will be greater Thursday night
with this system. 

There continues to be a slight chance to chance for rain showers
at times Friday through this weekend with a series of weak cold
fronts or low pressure troughs moving across the region.


&&

.AVIATION...VFR prevailed today as upper cloud cover shifted over
the region in advance of the next weak frontal boundary. This
boundary will bring light rain to areas primarily northward of Cape
Mendocino starting this evening. Rain will shift southeastward
across parts of Trinity and Mendocino Counties but will remain light
if any falls at all. Expect ceiling and visibility reductions with
the arrival of the rain tonight with conditions ranging from MVFR to
IFR. Conditions will steadily improve Tuesday afternoon as the rain
diminishes. /KML


&&

.MARINE...Nearshore buoy observations reported the WNW swell running
around 11 ft at 14 seconds this morning with a secondary wave system
at NW 7 to 9 feet at 10 seconds. This secondary wave system is
driving the sea state to be a foot or two higher than previously
predicted. Nevertheless, a small craft advisory remains in effect
across the entire northwest California coastal waters through
Tuesday afternoon for seas at or above 10 ft. Northerly winds will
ease up today, primarily north of Cape Mendo, as a weak trough
approaches Pt St George from the NW. NW winds will probably be gusty
around 25 kt tonight after this trough passes to our north and a
mini-surge develops behind it. We will see a break in heavy seas and
winds Tue night as an offshore flow regime develops. Lower seas and
easterly wind should hold through the early morning hours on Wed. 

The next storm system will drag a more potent front across the
region late Wednesday into Thursday. The GFS continues to be faster
and stronger than the ECMWF when it comes to gale force southerly
winds by Wednesday evening. A GALE WATCH remains in effect for the
outer waters starting 10AM Wed. It will probably take til afternoon
and evening for the strongest winds to arrive. The wave generation
with this storm will be dominated by short periods. Steep short
period waves around 10 feet or more are expected Wed night into Thu.
DUG/KML


&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...Winter Weather Advisory from 10 PM this evening to 10 AM PST 
     Tuesday for CAZ102.

NORTHWEST CALIFORNIA COASTAL WATERS...Small Craft Advisory until 1 PM PST 
Tuesday for PZZ450-455-470- 475.

Gale Watch from Wednesday morning through late Wednesday night
for PZZ470-475.

&&

$$

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