Area Forecast Discussion
Issued by NWS Eureka, CA
FXUS66 KEKA 270000
AREA FORECAST DISCUSSION
National Weather Service Eureka CA
400 PM PST Sun Feb 26 2017
.SYNOPSIS...Light mountain snow will continue through the night,
becoming more sporadic by early tomorrow morning. Scattered light
showers will persist Monday and early Tuesday, with drier and
milder weather expected Wednesday through Friday. Wet weather will
return over the weekend.
.DISCUSSION...Light rain and moderate high elevation snow
continues to fall across mostly Humboldt, Del Norte, and western
Trinity counties this afternoon as a cold front slowly passes
through the region. Thus far the forecast has verified reasonably
well with expectations, particularly with regards to the location
and timing of the heaviest precipitation. One fly in the
ointment, though, has been snow levels, which have been slightly
higher than expected due to slightly warmer temperatures. Still,
light snow has managed to accumulate along interior roadways
despite some initial melting, particularly at Collier Tunnel along
Hwy 199 and Berry Summit along Hwy 299, and snow levels have
generally ranged from 2000 to 2500 feet. At lower elevations,
light to briefly moderate rain has been generally not significant,
with occasional bouts of very small graupel/hail.
Through the evening tonight, steady snow associated with the cold
frontal boundary will transition to scattered convective showers,
and will primarily be limited to Humboldt and Del Norte counties.
As a result, additional snow accumulations during this period will
be light, but may still be enough to coat roads and at lower
elevations than was seen during the day today. As a result, the
ongoing winter weather advisory will continue until 4 AM. Waves
of light showers and high elevation snow will continue through
Monday and diminish early Tuesday as an upper level ridge
gradually builds across the West Coast. Very little impact can be
expected from this aside from a quick coating of light snow on
some high elevation rural roads above 2500 feet.
The second half of the work week looks to be much more pleasant,
with dry and mild afternoons and chilly mornings and evenings.
Rain will likely return to the region over the weekend,
particularly across Humboldt, Del Norte, and Trinity counties.
.AVIATION...A cold front will move southward this evening bringing
rain and MVFR conditions to KUKI and vicinity. Conditions should
improve later tonight as the rain ends. VFR conditions will probably
prevail at the coastal terminals tonight, though showers will
produce occasional MVFR ceilings and vsbys through the night at
KACV and KCEC.
.MARINE...A cold front moved through the northern waters this
afternoon. Winds have not been all that strong with this front,
with westerly winds gusting to around 25-30kt. Gusty NW winds around
25-30 kt will still be possible through this evening in the post
frontal showery air mass, primarily over the outer waters beyond
Main hazard for tonight into Monday will be short period NW seas
generated by a storm system offshore the Pacific Northwest. Surface
reports and ASCAT pass indicated a broad area of NW winds of 20 to
30kt. The short period NW swell from this storm will take til Monday
to arrive. This swell will combine with a longer period westerly
swell to produce seas around 10 ft tonight, mainly in the outer
waters. The ENP and NWPS indicate seas reaching 9-12 ft throughout
on Monday. Small craft advisories have been issued for all waters
except the the inner waters south of the Cape.
NW seas should subside on Tue. Overall seas will be relatively low
for much of next week. A slight ramp up in northerly winds may
produce an increase in short period wave energy south of Cape
Mendocino Wed into Thu, however a front will start to bust down on
the ridge toward the end of the week and the northerlies are not
expected to get too strong.
CA...Winter Weather Advisory until 4 AM PST Monday for CAZ102-105>108.
NORTHWEST CALIFORNIA COASTAL WATERS...Small Craft Advisory until 8 PM PST Monday for PZZ470.
Small Craft Advisory from 3 AM to 8 PM PST Monday for PZZ450.
Small Craft Advisory until 8 PM PST Monday for PZZ475.
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