004 FXUS66 KEKA 231236 AFDEKA AREA FORECAST DISCUSSION National Weather Service Eureka CA 436 AM PST Sun Feb 23 2020 .SYNOPSIS...A weak cold front will bring light rain and drizzle to primarily Del Norte and northern Humboldt counties today. High pressure will spring back and provide dry weather next week. && .DISCUSSION...A weak cold front to our NW will push across NW California today. HREF continues to indicate light rain/drizzle starting in Del Norte county this morning, spreading southward to Humboldt Bay and vicinity around noon or shortly thereafter. Measurable precip is expected, with amounts no more than a tenth or two. Otherwise, the front is expected to produce mainly cloud cover, cooler temperatures as well as breezy NW winds this afternoon and evening. High pressure will quickly build this evening and put an end to the light precip. High pressure will dominate NW California weather next week. Temperatures in the interior will start to rebound on Monday, and then climb through the week. Highs in the 70s are expected for southern interior Mendocino county. Coastal areas, particularly the North Coast, will probably not see much warming til mid or late in the week when the northerly breezes abate and an inverted trough develops along the coast. Even with the "mild" temperatures, interior valleys will likely dip below freezing each and every morning next week, primarily in Trinity county. The dominant offshore ridge appears to weaken slightly next weekend. Consensus is for large scale cooling next weekend. There continues to be large spreads in the models. Confidence we are going to see substantial precip remains low. Granted we could very well see a transient system, however there are indications that the ridge will just pop back up in the wake of a cold front that may move through NW California next Sunday. && .AVIATION...A weak frontal system will bring very light rain and MVFR ceilings to northern Humboldt and Del Norte counties today. Otherwise mostly VFR conditions will prevail with lifting ceilings in Humboldt and Del Norte counties late this afternoon/evening. Winds will be generally light. /RPA && .MARINE...A weak front will move through the waters today with moderate north winds redeveloping this afternoon. Additionally a large northwest swell will build into the waters with sea heights reaching 12-14 feet overnight into Monday. The swell will subside Monday night into Tuesday but steep northerly waves will develop as the north winds increase. Thus, small craft advisories returning this evening that currently expire early Tuesday morning as the swell subsides may need to be extended depending on model trends. The north winds are forecast to persist through the remainder of the week, though they should decrease in strength over time. /RPA && .EKA WATCHES/WARNINGS/ADVISORIES... CA...None. NORTHWEST CALIFORNIA COASTAL WATERS...Small Craft Advisory from 7 PM this evening to 3 AM PST Tuesday for PZZ450-470. Small Craft Advisory from 1 AM Monday to 3 AM PST Tuesday for PZZ455-475. && $$ 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 |