Area Forecast Discussion
Issued by NWS Eureka, CA

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FXUS66 KEKA 032134
AFDEKA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
234 PM PDT Fri Apr 3 2020

.SYNOPSIS...Precipitation will spread across the region tonight
into Saturday, resulting in beneficial rainfall across low
elevations, and locally heavy snow across portions of the interior
mountains. Additional showers are expected Sunday resulting in
continued snow over the mountains, and possible small hail and
thunder along the coast. Drier and warmer weather may develop
during mid to late next week.

&&

.DISCUSSION...An upper disturbance was moving southeast across the
NERN PAC during Friday afternoon. Cloud cover with that feature
will increase over NWRN CA this evening, with a shield of rain
spreading across the area late tonight. Upslope southerly winds
over the Trinity Alps will aid in dynamically lowering freezing
levels, which will favor locally heavy snow above 3500 feet in
northern Trinity County. This will support a winter storm warning
valid from 5 AM Saturday through 11 PM Sunday, with travel impacts
expected at Scott Mountain Summit on Highway 3.

Otherwise, beneficial low-elevation rainfall will occur across the
lowlands. Model guidance indicates weak destabilization will occur
Saturday afternoon resulting in a modest threat for small hail and
thunderstorms near the coast and inland across Mendocino and Lake
Counties. Precipitation will become increasingly showery in nature
going into Sunday as a colder upper low develops near the coast.
Snow will subsequently continue over the interior mountains, with
small hail and thunder possible near the coast, and also over
interior Mendocino and Lake Counties.

The previously mentioned upper low is forecast to move east across
the Lower Colorado River Valley by mid next week. Drier and
milder weather will develop in its wake, and persist into the
weekend.

JMG

&&

.AVIATION...Patchy stratus produced occasional MVFR ceilings at
KACV this morning. Otherwise conditions were VFR across the
region. Expect VFR conditions to continue to prevail through
evening as Cigs above 4000 feet, but mostly mid to high clouds
increase ahead of the next approaching system. Looking for rain to
move into KCEC and KACV between 06z and 12z tonight and spread to
inland terminals thereafter, bringing widespread MVFR CIGS with
occasionally lower conditions possible. /TA/CB.

&&

.MARINE...Small craft winds and seas occurring over the southern
inner waters this afternoon will quickly dissipate this evening as
an area of low pressure approaches from the northwest. Winds are
forecast to veer to westerly late tonight over the southern marine
zones, and southerly over the northern zones. A zone of 20-30 kt
southerlies are expected to progress east across the northern
waters Saturday morning...thus a brief small craft advisory has
been issued. Weaker winds are then expected Saturday night into
Sunday, followed by strengthening northerlies early to mid next
week. Otherwise, a mid period west-northwesterly swell is forecast
to move through the waters Sunday and Monday.

JMG

&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...Winter Storm Warning from 5 AM Saturday to 11 PM PDT Sunday for
     CAZ107.

NORTHWEST CALIFORNIA COASTAL WATERS...Small Craft Advisory from 3
     AM to 7 AM PDT Saturday for PZZ450- 470.

     Small Craft Advisory until 5 PM PDT this afternoon for PZZ455.

&&

$$

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