Area Forecast Discussion
Issued by NWS Eureka, CA
Issued by NWS Eureka, CA
239 FXUS66 KEKA 091130 AFDEKA AREA FORECAST DISCUSSION National Weather Service Eureka CA 430 AM PDT Sun Jun 9 2024 .SYNOPSIS...Temperatures will remain seasonable through the weekend with increasing marine influence near the coast. A moderate heat wave will build early next week. && .DISCUSSION...A 500mb trough will move over the area today and high temperatures in the interior will trend down a few more degrees compared to yesterday. High temperatures generally in the mid to upper 80s are forecast. This is close to seasonal normals. The bulk of the high clouds that this trough has been generating will exist the area by daybreak. Low clouds along the North Coast and adjacent river valleys will scour out this afternoon as northwesterly breezes increase. National blend of models continue to show temperatures warming up early to mid next week (Mon-Wed) as a broad flat 500mb ridge and above normal 500mb heights extends into NW California from the west. Interior highs in the mid 90`s to around 100F are forecast to return to mostly Trinity, Lake, interior Mendocino and NE Humboldt. The heat is forecast to peak on Tuesday with locally major heat risk in Lake County. Another trough in westerly flow will knock down the ridge toward the latter portion of the week; Thu-Sat and high temperatures will once again trend down to around seasonal averages. Chance for any rain toward the end of the week or next weekend is quite low, less than 10% near the Oregon border. DB && .AVIATION...Ceilings at the coastal terminals are largely MVFR early this morning, and conditions are expected to improve to VFR after sunrise. North-northwesterly winds will be gusty at the coast this afternoon, especially at CEC, before diminishing after sunset. Some low clouds are likely to reform tonight, with the highest confidence around Humboldt Bay. There is lower confidence of cloudiness for the Del Norte coast, with a trough likely to weaken the marine inversion and stratus potential. The possibility of a southerly surge from Humboldt Bay is not out of the question early Monday morning. UKI is forecast to remain VFR today with gusty northwest in the afternoon up to 20 knots. JB && .MARINE...Northerly winds will continue to be breezy in the outer waters and in the expansion fan south of Cape Mendocino. Windy areas continue to have steep wind waves of around 6 to 8 feet at 6 to 7 seconds. A mid-period westerly swell has begun to fill early this morning at around 6 to 7 feet at 14 seconds. Northerly wind waves will increase today bringing steep seas across most the waters. The strongest winds and steepest waves will be in the expansion fan south of Cape Mendocino and locally off of Pt St George. These will persist, though lull slightly into Monday afternoon. Tuesday afternoon into Wednesday morning, winds are forecast to ramp up to more widespread gale force gusts across the outer waters and gradually building steep seas with it. Another relatively minor mid- period northwest swell will fill in Tuesday. Wave heights continue to increase further into the week, with significant wave heights up to 15 feet in the outer waters possible by Thursday. JB && .EKA WATCHES/WARNINGS/ADVISORIES... CA... None. NORTHWEST CALIFORNIA COASTAL WATERS... Small Craft Advisory from 9 AM this morning to 3 PM PDT Monday for PZZ450. Small Craft Advisory until 3 AM PDT Tuesday for PZZ455-470. Small Craft Advisory until 3 PM PDT this afternoon for PZZ475. Gale Warning from 3 PM this afternoon to 9 AM PDT Monday for PZZ475. && $$ 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