Area Forecast Discussion
Issued by NWS Eureka, CA
Issued by NWS Eureka, CA
330 FXUS66 KEKA 170705 AFDEKA AREA FORECAST DISCUSSION National Weather Service Eureka CA 1205 AM PDT Sun Aug 17 2025 .SYNOPSIS...Very minimal chance of isolated showers over high terrain early today. Cool and moist weather will stick around for a couple days before gradually heating up into mid next week. && .DISCUSSION...Most of the early season rain has come and gone Saturday. However, high resolution models indicate some very minor potential (10% chance) for isolated showers and perhaps thunderstorms this morning around the Yolla Bollys. More unstable air behind the front has helped scatter out skies near shore, though midlevel clouds remain persistent. This new fresh moisture at the surface may (30% chance) create areas of dense fog tonight, especially around Humboldt Bay and up the Eel River Valley. Cooler and more moist than normal weather will continue into Monday with even interior highs really struggling to reach much above 80F. Overnight marine layers should stay persistent at the coast, but a weaker inversion will likely allow for much better day time clearing early this week. There is high model confidence that weak high pressure, and associated warmer and drier weather, will gradually reassert itself through by mid to late week. Though there is a range of uncertainty by the end of the week, there is little chance of extreme heat (20% or less) returning with highs most likely staying just at or below 100F for interior locations by Friday. /JHW && .AVIATION...(06Z TAFs)...IFR to LIFR ceilings are forecast for coastal terminals. Into Sunday morning, expect LIFR conditions with vsby in fog. There is a 30-40% chance for vsby in 1/4SM or less into Sunday for CEC, ACV and around HUmboldt Bay. Otherwise, mid to high clouds will continue through the region into Sunday morning. Gusty winds and VFR conditions are expected for UKI. && .MARINE...Northerly winds have diminished across the coastal waters, and will continue to ease through Sunday. Light to moderate breezes are forecast for this weekend. Although, some gusty winds up to 25 kts are likely in the leeward of Cape Mendocino Sunday afternoon. A NW swell will continue and is forecast to peak to around 5 to 6 feet at around 10-11 seconds early Sunday. Relatively calm conditions with light to gentle breezes and low seas will continue early to mid next week, before northerly winds increase again by mid week with a thermal trough developing near the coast. /ZVS && .FIRE WEATHER...A very slight chance for thunderstorms over eastern Trinity County this afternoon. These storms are more likely to manifest as showers over higher terrain as the last bit of the cold frontal passage flows away from our area. In Mendocino and Lake County, winds will be stronger today than normal due to the increased mixing from frontal impacts. Thankfully, RH recovery will be high this morning before decreasing through the week as high pressure returns to the PacNW. && .EKA WATCHES/WARNINGS/ADVISORIES... CA... None. NORTHWEST CALIFORNIA COASTAL WATERS... None. && $$ NOTE: The full forecast discussion is now regularly issued between 10 am/pm and 1 pm/am. Additional updates will be issued as needed. 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