Hazardous Seas Watch 4, NWS Eureka, CA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
225 PM PST Sun Nov 26 2017

.SYNOPSIS...A shortwave trough will pass through the region
tonight. High pressure will then build and bring drier weather to
the area.

&&

.DISCUSSION...Conditions will remain wet and breezy for northwest
California this afternoon and evening as the last shortwave trough
passes through the region. Winds will gradually diminish tonight
while showers and isolated thunderstorms taper off early tomorrow
morning. Thunderstorms should be confined to the southern coastal
areas, but the northern outer waters may score a few storms. High
pressure will then take over the forecast and keep the majority
of the CWA dry for the work week; however, a weak frontal system
will skirt over northern California on Tuesday. Any rain that is
received will stay north of Mendocino County with the bulk of it
(a quarter inch or less) falling in Del Norte County. Following
that, the next chance for rain will be over the weekend. Models
agree that a trough will dig over the West Coast, but not on its
placement. Temperatures are expected to be cool and conditions
look to be wet during this period.

&&

.AVIATION...A round of stronger showers moved through around
Midday along the coast bringing gusty winds. Some localized wind
shear was reported at KACV. This continues to move to the east
this afternoon. There a few isolated showers off the coast that
may move onshore onshore later this afternoon and evening.

Vis satellite shows another round of heavier showers well off the
coast. HRRR simulated radar shows this moving onshore around 04Z
to 07Z depending on the location. There is the potential for
thunder with these showers, the best chance looks to be coastal
Mendocino county. For now have left them out of the TAFS. These
showers are expected to start moving out of the area late tonight.
Monday there may be some valley low clouds in the morning, but
otherwise light to moderate northerly winds and VFR conditions
are expected. MKK

&&

.MARINE...This afternoon showers continue to move through the
waters. Increased instability may result in occasional strong
wind gusts this afternoon and evening, particularly near any
strong showers that develop. There is also the potential for
an isolated thunderstorm or two this evening. Tonight, a low
pressure system will pass through the waters, causing winds to
veer to the west, and then north, with occasional strong wind
gusts as well...especially in the southern waters. While winds
won't be light by any means, the changing wind direction will lead
to an overall subsiding of steeper, wind- driven seas. However,
westerly and northwesterly swell will build in its place,
maintaining an elevated and somewhat mixed sea state through
Monday, even though overall wave heights will very slowly
decrease.

A weak weather system will weaken diminish the northerly winds and
bring some light southerly winds Monday night and Tuesday. This
will also bring lower seas. Seas late Monday and early Tuesday
will likely be the lowest of the entire weak.

Northerly winds will increase once again late Tuesday and
Wednesday, and at the same time, a large northwest swell will
build into the waters. As a result, seas will become large, mixed,
and hazardous by mid- week.

Thursday through Saturday winds will be fairly light, however seas
will remain around 10 to 12 as several northwest swells move
through the waters. MKK/BRC

&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...None.
NORTHWEST CALIFORNIA COASTAL WATERS...Small Craft Advisory until 9 PM PST Monday for PZZ450-455-470-
     475.

&&

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For forecast zone information
see the forecast zone map online:
http://www.weather.gov/eureka/zonemap.png

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PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EUREKA CA
953 PM PST SUN NOV 26 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0931 PM     HAIL             5 S FORT BRAGG          39.36N 123.79W
11/26/2017  E0.25 INCH       MENDOCINO          CA   COCORAHS

            DURATION OF HAIL FALL WAS 2 MINUTES.

&&

JMG