Area Forecast Discussion
Issued by NWS Eureka, CA

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FXUS66 KEKA 191138

National Weather Service Eureka CA
438 AM PDT Mon Mar 19 2018

.SYNOPSIS...Dry weather through tonight. Active weather will
return on Tuesday and persist through the week.


.DISCUSSION...It is going to be another cool start today for most
locations. A Frost Advisory remains in effect for interior Mendocino
county where numerous sites have been reporting temperatures in
the lower to mid 30s early this morning. It has been colder in the
valleys of Trinity county, but the so called growing season has
not started there yet.

Dry weather is expected today and tonight before wet weather
returns on Tuesday. A storm system will approach from the
southwest on Tuesday and then stall offshore. Moist southwesterly
flow intersecting the coastal ranges will result in light to
moderate rain by late morning into the afternoon for most areas.
The offshore storm will be slow to progress eastward Tue Night
through Wed and expect additional waves of rain with mild conditions
and relatively high snow levels. The NAM12 does indicate the potential
for surface development on Wednesday. The GFS and ECMWF were not
as bold with surface development. Confidence remains too low at
this point to highlight it as a strong wind event.

Models were in good agreement with driving the cold front across
the forecast area Wed night into early Thu morning. Lowering snow
levels, low top convection and bouts of rain and snow showers are
expected Thu through Sat as a cold upper trough develops offshore
the Pac NW. The threat for winter weather and snow over the
mountain passes will increase Thu through Sat. Stay tuned.


.AVIATION...Mostly VFR conditions are expected at all TAF sites
through the next 24 hours with generally light winds. Mid and high
cloudiness will increase once again during the afternoon. SE-S winds
may pick up to 10 to 15 kts in the higher terrain near UKI around
midday. /SEC


.MARINE...A weak pressure gradient will maintain light NE winds
through tonight with winds veering on Tuesday. A developing storm
system over the E Pacific will bring increasing SE-S winds and
large, steep seas by late Tuesday into Wednesday. Gale force gusts
will be possible late Wednesday, followed by a period of westerlies
late in the week. Combined seas will build to 12 to 15 feet by late
in the work week. /SEC


CA...Frost Advisory until 9 AM PDT this morning for CAZ110-113.

     Freeze Warning until 9 AM PDT this morning for CAZ111.



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