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PZZ455 Cape Mendocino To Pt Arena Out 10 Nm- 858 Am Pst Thu Dec 7 2023
.small craft advisory in effect through late tonight...
Today..NW winds 10 to 15 kt. Waves W 12 ft at 14 seconds. Chance of rain, slight chance of showers and tstms.
Tonight..N winds 10 to 15 kt. Waves W 11 ft at 13 seconds. Slight chance of rain.
Fri..N winds 10 to 20 kt. Waves W 10 ft at 13 seconds.
Fri night..N winds 5 to 15 kt. Waves nw 8 ft at 12 seconds.
Sat..NE winds 5 to 10 kt. Waves nw 5 ft at 11 seconds...and N 4 ft at 15 seconds.
Sun..NE winds 5 to 10 kt. Waves W 8 ft at 13 seconds.
Mon..N winds 10 to 15 kt. Waves W 6 ft at 11 seconds.

PZZ400 858 Am Pst Thu Dec 7 2023
Synopsis for northern california waters... A line of showers is continuing to move through the area this morning, allowing for an ongoing potential threat of isolated Thunderstorms and waterspouts, small hail, and isolated gale force gusts in the northern waters through the afternoon. As wind waves and a long period westerly swell diminish this morning, the sea state will slowly subside into the weekend. Northerly winds will diminish slightly this afternoon, but remain elevated in the southern waters before turning southerly in the latter half of the weekend.

FXUS66 KEKA 071342 AFDEKA

AREA FORECAST DISCUSSION National Weather Service Eureka CA 542 AM PST Thu Dec 7 2023

SYNOPSIS
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.

DISCUSSION
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 anomalies on Sunday.

AVIATION
As a front moves through early this morning, showers and isolated thunderstorms will impact the region, bringing gusty winds, low ceilings, and lowered visibility. Showers will be frequent this morning, then decrease this afternoon. MVFR conditions are expected this morning, but could periodically rise to VFR conditions in between showers. Impacts to UKI will be relatively lighter compared to CEC and ACV, but fog did form again in UKI this morning. VFR conditions should lift in UKI as the front moves in, lifting to MVFR during showers and VFR in between showers.



MARINE
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 4 PM PST this afternoon for CAZ107.

NORTHWEST CALIFORNIA COASTAL WATERS...
Small Craft Advisory until 4 AM PST Friday for PZZ450-455- 470-475.

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Mendocino
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Thu -- 12:06 AM PST     1.53 feet Low Tide
Thu -- 01:53 AM PST     Moonrise
Thu -- 06:46 AM PST     5.34 feet High Tide
Thu -- 07:21 AM PST     Sunrise
Thu -- 01:35 PM PST     1.40 feet Low Tide
Thu -- 01:47 PM PST     Moonset
Thu -- 04:51 PM PST     Sunset
Thu -- 07:18 PM PST     3.73 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION

Mendocino, Mendocino Bay, California, Tide feet

Point Cabrillo
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Thu -- 01:15 AM PST     0.00 knots Slack
Thu -- 01:53 AM PST     Moonrise
Thu -- 04:18 AM PST     0.77 knots Max Flood
Thu -- 07:21 AM PST     Sunrise
Thu -- 07:23 AM PST     -0.00 knots Slack
Thu -- 10:16 AM PST     -0.92 knots Max Ebb
Thu -- 01:47 PM PST     Moonset
Thu -- 02:19 PM PST     0.00 knots Slack
Thu -- 04:51 PM PST     Sunset
Thu -- 05:06 PM PST     0.65 knots Max Flood
Thu -- 08:00 PM PST     -0.00 knots Slack
Thu -- 10:27 PM PST     -0.67 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION

Point Cabrillo, California Current, knots

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