Small Craft Advisory 109, NWS Eureka, CA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
427 AM PDT Sun Oct 30 2022

.SYNOPSIS...Temperatures will be slightly warmer today under a
passing ridge. A strong cold front will move across the area late
Monday, ushering in much colder temperatures, rain and mountain
snow, and occasionally gusty winds.

&&

.DISCUSSION...Patchy coastal and valley fog developed overnight,
but visibilities are improving this morning. A passing ridge of high
pressure will warm temperatures a few degrees higher than yesterday.
More coastal stratus, areas of fog, and inland valley frost can be
expected again tonight. A strong, well defined cold front will
arrive Monday night as a trough begins digging in from the north.
Widespread, and beneficial rainfall will initially sweep through
with the cold front Monday night, followed by lingering lighter rain
and showers Tuesday. North to northwest winds will become gusty
behind the front on Tuesday morning.

Another round of widespread rainfall will pick up
again later Tuesday afternoon with the passing of the trough
axis. As this occurs, lapse rates will steepen coincident with
some modest instability. This may allow for some isolated
thunderstorm development over the northern coastal waters, with
slight chances along the coast from Northern Humboldt into coastal
Del Norte. There is a very low threat of small hail, but not
enough to include in the forecast at this time. More additional
light rain chances will linger into late Wednesday. The coldest air
will settle in Wednesday and especially Thursday morning where
widespread frost and inland freezing temperatures, with areas of
hard freezes will occur. Storm total rainfall is expected to
generally range from about 1 inch over Del Norte County to around
1/10 inch in S Lake County. High elevation snow, beginning early
Tuesday morning will be generally light, but some totals of 2-4" are
possible near Scott Mountain Summit which may impact travel along
Highway 3. /JJW

&&

.AVIATION...LIFR conditions mostly prevailed overnight at both
coastal terminals and this should continue through around mid-
morning and then give way to MVFR to VFR conditions. Expect we'll
see another round of IFR to LIFR conditions later this evening and
tonight along the coast, with areas of fog likely impacting both
coastal sites. VFR conditions should prevail at KUKI through the TAF
period.

&&

.MARINE...Fresh northerlies will prevail south of Cape Mendocino
through early Monday, while mostly gentle breezes prevail north of
the Cape. Another increase in north winds is expected starting
Monday night. Moderate to fresh breezes will then persist through
the rest of the work over the coastal waters. A decaying northwest
swell will be reinforced by a long-period (18 to 20 seconds)
northwest swell, topping out around 13 to 14 feet on Monday. Yet
another reinforcing northwest swell is then forecast to move through
the waters late on Tuesday and into Wednesday. Otherwise, building
short-period seas can be expected in response to the increasing
northerlies starting Tuesday.

&&

.BEACH HAZARDS...A Beach Hazards Statement has been launched to
cover the threats the upcoming long-period swell will bring to area
beaches on Monday. Forerunners for the swell will bring the threat
of sneaker waves during the morning hours. Larger breaking waves of
16 to 20 feet will be possible starting Monday afternoon and the
early season beach profiles may help to increase wave run-up on area
beaches. Hazardous conditions should come to an end late Monday
evening.

&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...
     Beach Hazards Statement from late tonight through Monday
     evening for CAZ101-103-104-109.

     Frost Advisory until 9 AM PDT this morning for CAZ106-107-
     110-111-114.

NORTHWEST CALIFORNIA COASTAL WATERS...
     Small Craft Advisory until 6 AM PDT early this morning for
     PZZ450.

     Small Craft Advisory until 3 PM PDT Tuesday for PZZ455-470-
     475.

&&

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For forecast zone information
see the forecast zone map online:
https://www.weather.gov/images/eka/zonemap.png

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