Area Forecast Discussion
Issued by NWS Eureka, CA
Issued by NWS Eureka, CA
717 FXUS66 KEKA 170826 AFDEKA AREA FORECAST DISCUSSION National Weather Service Eureka CA 126 AM PDT Thu Jul 17 2025 .SYNOPSIS...Inland temperatures trend low and remain warm and dry into the weekend. The coastal stratus will remain more persistent over the coastal regions, lowering the daytime highs for some areas. && .DISCUSSION...Inland temperatures are forecast to be a few degrees cooler Thursday as the trough to the north slightly deepens. The low- level inversion has strengthened, and will remain strong to moderately strong this week. A weak shortwave trough remains off the coast most of Thursday. In response, the marine layer will further deepen and contribute to more diurnally present coastal stratus. This will hold daytime highs down a bit where clearing does not occur. There is a very slight chance (less than 5%) for dry thunderstorms in northern Trinity County Thursday afternoon. Model soundings show very limited elevated instability and available moisture, with a good amount of CIN. && .AVIATION...Coastal clouds are well entrenched with little clearing expected over the next 36 hours or so as a strong inversion remains in place over the marine layer. LIFR to IFR will likely persist at ACV and CEC. Winds will remain light at the coast. The direction is the main challenge with strong coastal eddies evident on satellite all day on Wednesday. A similar situation is likely for Thursday with southerly winds favored in the forecast. Farther inland, the coastal clouds will spill into the near-coastal valleys and possibly move north from Sonoma County into the Ukiah area overnight. This could bring a brief period of low clouds to UKI around daybreak. Otherwise VFR is likely for interior areas on Thursday. /RPA && .MARINE...Light winds and low seas are expected on Thursday into Thursday night with the thermal trough located off the Northwest California coast. As high pressure re-builds over the eastern Pacific Ocean the pressure gradient should tighten over the coastal waters allowing northerlies to strengthen Friday into this weekend. Moderate to strong northerlies and steep seas are likely over the weekend with small craft advisories possible, most likely in the outer waters. /RPA && .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