Area Forecast Discussion
Issued by NWS Eureka, CA
Issued by NWS Eureka, CA
026 FXUS66 KEKA 172204 AFDEKA AREA FORECAST DISCUSSION National Weather Service Eureka CA 304 PM PDT Wed Jul 17 2024 .SYNOPSIS...Quiet, dry, and climatologically normal weather is forecast to continue through the work week. Interior temperatures creep back up into the triple digits this weekend. There is a slight chance for thunderstorms Saturday in Trinity county. && .DISCUSSION...The shortwave has pushed out of the area and left cool and dry air in it`s wake. This has weakened the marine inversion and allowed clouds to clear out this afternoon up and down the coast. Inland areas are warming into the 80s to near 90. Winds at some the interior areas of Humboldt and Del Norte counties have switched to the northwest this afternoon. Thursday and Friday high pressure remains just of the east of the region. Flow aloft will be south to southwest while flow at the surface will be out of the north to northwest. Temperatures start warming on Thursday with additional warming on Friday as high pressure strengthens over the area. This stronger high pressure is expected to shrink the marine layer and limit clouds to closer to the coast. Friday night some of the models start to show an upper level low off the southern CA coast start to move north. Some of the clusters show increased moisture with this feature and the GFS has a fairly strong shortwave off the coast. So have added the potential for thunderstorms over Trinity county Saturday afternoon. It is possible these storms could occur Saturday night or on Sunday, the timing and locations are still uncertain. Monday and into the middle of next high pressure continues to build over the area. Highs from 100 to 108 are possible in the interior valleys. This brings an elevated heat risk and an advisory or warning may be needed. MKK && .AVIATION...The coastal TAF sites experienced a positive marine layer influence today; the catalyst was a notable mid-layer disturbance that lifted the stratus form IFR to MVFR. Before noonday, clouds had mostly dissipated from Humboldt Bay-Arcata-Klamath but were more stubborn at Crescent City until 1:00 PM. Aviation over Northeast Humboldt, and western Trinity was possibly impacted by wildfire smoke near Willow Creek; other inland areas were SKC. On Thursday, the marine layer is expected to become more compressed...resulting in lower Cig/Vis at the coast IAW with some model guidances and a little history. CEC and ACV expected to drop to IFR (300-600 feet) overnight. /TA && .MARINE...Light southerly winds will begin to turn northerly this evening into Thursday. Winds will broadly increase, especially especially south of Cape Mendocino. Winds there could see gusts up to 25-30 knots. Steep seas of around 6-7 ft at 6 seconds will be found south of the Cape through the end of the week. Late this weekend, winds and seas ramp up further with near-gale force winds possible south of the Cape with steep to hazardous seas across the waters. JB && .EKA WATCHES/WARNINGS/ADVISORIES... CA... None. NORTHWEST CALIFORNIA COASTAL WATERS... Small Craft Advisory from 3 AM Thursday to 3 AM PDT Friday 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