Point St. George to Point Arena between 60 and 150 NM Offshore Forecast
|Today...W To Nw Winds 15 To 25 Kt. Seas 12 To 15 Ft. Chance Of Showers.|
|Tonight...N To Nw Winds 10 To 20 Kt, Becoming 10 To 15 Kt. Seas 10 To 13 Ft.|
|Fri...N To Nw Winds 5 To 15 Kt. Seas 8 To 11 Ft.|
|Fri Night...N Winds 5 To 15 Kt, Becoming Variable. Seas 7 To 9 Ft.|
|Sat...S Winds 10 To 20 Kt. Seas 5 To 8 Ft.|
|Sat Night...S Winds 10 To 20 Kt. Seas 7 To 12 Ft.|
|Sun...S To Sw Winds 15 To 25 Kt. Seas 7 To 12 Ft.|
|Sun Night...W To Nw Winds 5 To 15 Kt, Becoming Nw 5 To 10 Kt. Seas 7 To 10 Ft.|
|Mon...N Winds 5 To 15 Kt, Increasing To 10 To 20 Kt. Seas 6 To 8 Ft.|
|Mon Night...N Winds 10 To 20 Kt. Seas 6 To 8 Ft.|
| Area Forecast Discussion|
National Weather Service Eureka CA
542am PST Thu Dec 7 2023
Showery conditions continues across through this evening, with snow levels above 3500 feet MSL. Lingering cold air will promote frost and freezing temperatures tonight across the interior valleys. Dry and warming trend expected heading into Saturday as high pressure builds in. A weak upper trough will approaches the region Sunday into early next week bringing additional precipitation across northern California.
Post-frontal isolated to scattered showers continue across NW California overnight. Rain amounts over the last 24 hours (3AM Wednesday-3AM Thursday) ranged from 0.75 to 1.5 inch with locally higher amounts over much of Del Norte, Humboldt, Mendocino, western Trinity and northern Lake counties, with lesser amounts south and east of the CWA.
Colder air will continue to flow into Northern California early this morning as a secondary and weaker embedded shortwave trough within the upper trough settling over the West Coast. As of 3AM PDT, Latest radar has a strong line showers along of the advancing cold front approaching from the west. Heavy rainfall moved subsequently along the Humboldt Bay and vicinity. Scattered showers continue moving on shore and becoming convective. With the increasing instability, isolated thunderstorms, brief heavy downpours and small hail will be possible with it. Another 0.5 to 1 inches with locally higher amounts are expected today over Humboldt, Del Norte and western Trinity counties. While Mendocino and Lake counties additional rain amounts will range from few hundredths to half of an inch. The heaviest rain is expected mid to late this morning, with snowfall accumulations from 4 to 8 inches in areas above 3,500 feet MSL. Scott Mountain Summit on Highway 3 may see up to 5 inches in a period of 12 hours this morning through the afternoon. Lighter snow is possible as low as Trinity Center with only trace amounts on highways 299 and 36. Snow impacts should be restricted to the high elevations of Trinity County. A winter weather advisory remains in effect through for northern Trinity County, including Scott Mountain Summit. Showers activity will gradually diminish late this afternoon through the evening.
The trough is then forecast to exit to the east-southeast while ridging builds aloft Friday, quenching shower activity and bringing a return of northerlies. Overnight lows are expected to be cold during this time, reaching the upper 30's at the coast and mid 20's inland. Dry weather is expected on Saturday, before another frontal system approaches along with PWATs (Precipitable Waters) anomalies on Sunday.
A line of showers and isolated thunderstorms will move across the waters this morning and afternoon. Isolated gale force gusts are possible within bands of showers, especially in the northern waters. These will decrease in frequency this evening, then clear out tonight. Gusty winds will diminish behind the front and winds will remain light tonight, before northerlies pick up tomorrow, providing especially gusty winds south of Cape Mendocino. The sea state remains elevated, but continues to trend down, and should be below 10 ft by Friday. Another westerly mid-period swell fills in Sunday.
.EKA WATCHES/WARNINGS/ADVISORIES... CA... Winter Weather Advisory until 4pm PST this afternoon for CAZ107.
NORTHWEST CALIFORNIA COASTAL WATERS... Small Craft Advisory until 4am PST Friday for PZZ450-455- 470-475.