679 
FXUS66 KEKA 302307
AFDEKA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
307 PM PST Mon Nov 30 2020

.SYNOPSIS...A weak front moved throught the region today bringing 
clouds and some light rain to the coastal areas of Del Norte and 
Humboldt counties. Another frosty morning is expected for some 
areas tomorrow as skies clear out with light winds. Persistent 
high pressure will result in an extended period of dry and mild 
weather starting on Tuesday and lasting into the weekend. 


&&

.DISCUSSION...The tail-end of a cold front clipped the northern 
portions of our forecast area this morning with some light rain
and areas of drizzle. As today's shortwave trough axis passes 
quickly east of our area, with rising heights, subsidence and 
drier air filtering in this evening. Most guidance keeps the 
coast fairly cloudy through sunset, but would not rule out some 
partial clearing late, especially along the Del Norte coast. 
Heading into tonight, another Frost Advisory is in effect for the
coastal areas of Humboldt County, but feel the Mendocino coast
will not see enough coverage to warrant another advisory. 
Lingering moisture and some valley fog development may limit 
radiational cooling and frost formation, with less than high 
confidence in the forecast low temperatures. 

Otherwise, the rest of the week and even into next weekend looks
extremely quiet, with likely an extended stretch of dry weather
for northwest California. A building upper level ridge over
California and the Pacific Northwest will take on a Rex Block
configuration, which will keep any northern Pacific storm systems
from reaching us. One system attempting to run into the ridge may
'split' enough moisture toward northern California for some 
increased clouds on Thursday. A similar scenario is possible 
again later in the weekend, but otherwise prospects for rain 
aren't looking good until the ridge breaks down, perhaps as we 
head into mid December. High temperatures look unseasonably mild 
with light winds forecast through the weekend. /AAD/JT



&&

.AVIATION...As fronts pass through, bringing light rain to the 
coastal terminals, IFR and MVFR conditions toggle and vary flight 
conditions as well as visibility. Lowered ceilings around 1500 feet 
and overcast skies are lingering as convective profiles are 
diminishing.  Mist may linger for a period before the high pressure 
regime continues as before with dry weather. North winds will pick 
up late tomorrow morning for KCEC.  Light North winds for KACV 
tomorrow afternoon with skies clearing out. Meanwhile, VFR and 
mostly clear skies are expected to prevail at KUKI for the TAF 
period. /EYS



&&

.MARINE...As a long period swell passes through the waters, around 
10 feet at 17 seconds, small craft advisories are in effect for all 
waters in the CWA. A series of fronts are making their way over the 
area bringing light rain.  Gusts around 24 knots and strong breezes 
around 20 knots will fill in behind the fronts, further agitating 
the already hazardous sea state. A short window of reprieve Tuesday 
night will be followed by a much expected long period swell 
Wednesday morning, 6 to 10 feet at 21 seconds.  This wave group will 
raise a sneaker wave threat, which has prompted a Beach Hazard 
Statement to be issued from Wednesday morning through Wednesday late 
evening. This also raises concern for shoaling in shallower coastal 
waters which is a hazard for unsuspecting mariners.  Avoid shallow 
waters when long period waves are present and do not rely on visual 
verification of breaking waves to identify shoals. /EYS


&&

.BEACH HAZARDS...A long period west-northwest swell is on
track to arrive Wednesday. Little has changed with respect to the 
high risk of sneaker waves, with light winds Wednesday morning and 
little to interfere with the set behavior. Additionally, sunny skies 
and mild temperatures will tend to lure folks to the beaches, thus 
have issued a Beach Hazards Statement to highlight the threat. If 
anything, the projected timing has sped up a bit, so the risk will 
begin in the morning and continue into Wednesday night. On Thursday 
the waves build high enough to keep them from being as 'sneaky', but 
there still may be some in-frequent large waves. /AAD /EYS


&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...Beach Hazards Statement from Wednesday morning through Wednesday 
     evening for CAZ101-103-104-109.

     Frost Advisory from midnight tonight to 9 AM PST Tuesday for 
     CAZ103.

NORTHWEST CALIFORNIA COASTAL WATERS...Small Craft Advisory until noon PST Tuesday for PZZ450-455.

     Small Craft Advisory until midnight PST Tuesday night for PZZ470-
     475.

&&

$$

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