449 FXUS66 KEKA 192135 AFDEKA AREA FORECAST DISCUSSION National Weather Service Eureka CA 235 PM PDT Mon Aug 19 2019 .SYNOPSIS...Seasonable temperatures will persist through mid week. There is a chance for light rain on Wednesday over Del Norte County. Warmer temperatures are expected across the interior later in the week. && .DISCUSSION...Weak troughing is maintaining seasonable temperatures and generally pleasant conditions across NW California this afternoon. Coastal stratus has lingered along parts of the Mendocino coast and also from Patrick's Point northward to the Oregon border, with mostly sunny skies in between from Cape Mendocino to Humboldt Bay. Expect this stratus to expand in coverage relatively quickly this evening as the marine layer has deepened to around 2500-3000 ft per the ACV profiler. This will contribute to the potential for some patchy drizzle along the North Coast Tuesday morning. Otherwise, Tuesday should be fairly similar to today across the area as weak cyclonic flow remains overhead. Guidance continues to converge on a solution for Wednesday as an upper trough moves inland over the Pacific Northwest and drives a weak cold front towards the northern portion of the area. This will be accompanied by an unseasonably moist air mass characterized by precipitable water values approaching two inches, lending increased confidence to light rain potential across the far north Wednesday afternoon/evening. Have increased rain chances accordingly for Del Norte, with the potential for a few sprinkles as far south as Eureka Wednesday afternoon. The trough will quickly depart Wednesday night, leaving the area beneath quasi-zonal flow for the end of the week. Expect interior temperatures to gradually trend upward during this time as heights slowly rise and 850 mb temps increase from the mid to upper teens into the low 20s C. No additional precipitation is expected from Thursday into early next week. /CB && .AVIATION...The deepening marine layer has allowed coastal stratus to linger well into the afternoon once again, particularly along the Del Norte coast where IFR cigs have remained in place into early afternoon. A weak mesoscale circulation has helped to open up a hole near CEC, allowing a few hours of VFR before stratus fills back in later this afternoon. VFR conditions are more prevalent along the Humboldt coast including at ACV, although some lingering cloud cover encroaching from the north will keep at least some threat of IFR/MVFR cigs in the forecast for much of the day. Expect stratus to quickly redevelop again this evening and drop coastal terminals to IFR/LIFR through Tue morning, with clouds once again lingering into the afternoon. Inland airfields will continue to see predominantly VFR conditions through the period. Can't rule out a brief window of IFR cigs at UKI around sunrise, as has been the case with weak southerly winds the past few mornings. /CB && .MARINE...Light to moderate northerly breezes will continue to trend downward through tonight across the outer waters as surface high pressure builds toward the coast and relaxes the coastal gradient. This will yield mainly light and variable winds with relatively calm seas across the waters for Tuesday. Winds will then switch to southerly by Wednesday ahead of an approaching front, with a period of moderate to fresh breezes possible across the far northern portions of the area. Northerlies will quickly return in the wake of the front, with the next round of Small Craft Advisories likely needed by Thursday morning as short period seas begin to ramp up again. The northerly wind regime and elevated seas then look to persist at least through the weekend. Additionally, a pair of small mid-period swells will continue to move through the waters from the northwest for the next few days. /CB && .EKA WATCHES/WARNINGS/ADVISORIES... CA...None. NORTHWEST CALIFORNIA COASTAL WATERS...None. && $$ 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