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. && $$ Visit us at https://www.weather.gov/eureka Follow us on Facebook and Twitter at: https://www.facebook.com/NWSEureka https://www.twitter.com/NWSEureka For forecast zone information see the forecast zone map online: https://www.weather.gov/images/eka/zonemap.png