Area Forecast Discussion
Issued by NWS Eureka, CA
Issued by NWS Eureka, CA
040 FXUS66 KEKA 221022 AAA AFDEKA AREA FORECAST DISCUSSION...UPDATED National Weather Service Eureka CA 322 AM PDT Wed Jul 22 2026 SYNOPSIS...Monsoonal moisture quickly depart late Tuesday, ending the risk for a stray thunderstorm. Drier weather is expected late in the week with temperatures near or slightly below seasonal normals. DISCUSSION...Wednesday, an area of low pressure starts to move past the area bringing a slightly more forcing with some instability in the afternoon and evening. The associated moisture quickly exited north of the area late Tuesday, ending the risk for interior thunderstorms. Thursday, the upper level trough is expected to get closer to the area and this is expected to start bringing cooler temperatures, back to near or slightly below normal with highs in the upper 80s to mid 90s. This is expected to bring some stronger west to southwest winds in the afternoon. Similar temperatures and winds are expected to continue on Friday. For details see the fire weather section. High pressure is expected to bring warmer temperatures to the area for the weekend with dry weather. AVIATION...A passing remnant tropical system has greatly weakened the low level inversion, limiting stratus coverage overnight Tuesday. Increasing southerly winds look to drive marine stratus northward toward CEC Wednesday, and perhaps clearing the low clouds from ACV through at least through Wednesday night. This system will bring strong southerly winds near Humboldt Bay and perhaps getting into ACV where gusts over 25 kts would be possible in the afternoon. Ceilings with the stratus are expected to transition from LIFR to IFR and perhaps MVFR through the afternoon hours. Soundings point to deepening and lifting of ceilings through the afternoon hours. Robust overnight southerly winds have driven stratus into UKI Wednesday morning. Ceilings may lower at or below 1700 ft AGL through the 15-16Z Wednesday before clearing out. JJW MARINE...A remnant tropical system is passing through the waters Wednesday. As it passes, areas of near gale strength southerly wind gusts will develop in the northern waters around and north of Cape Mendocino, including in the northern inner waters along the coast south of Arcata and along Humboldt Bay. These winds will quickly ease Wednesday night. Winds and seas will then remain low for the remainder of the week. JJW FIRE WEATHER...Wednesday, the upper level low related to the departing tropical system moves closer to the area, The associated moisture quickly exited north of the area late Tuesday, ending the risk for interior thunderstorms. Thursday and Friday the threat for thunderstorms diminishes; however, some stronger west to southwest winds are expected. At this point it looks like the RH will be too high to warrant a fire weather watch. Will likely add a headline to the forecast once it gets within range of the higher resolution models if the winds remain in the forecast. MKK/JJW && .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