Sunrise 6:21 AM   Sunset 8:07 PM Moonrise 8:19 PM   Moonset 5:33 AM

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PZZ450 Pt St George To Cape Mendocino Out 10 Nm- 204 Am Pdt Wed Apr 24 2024
Today - N winds 5 to 15 kt. Waves N 4 ft at 6 seconds.Tonight - NW winds 5 to 10 kt. Waves N 5 ft at 6 seconds. Thu - S winds 5 to 10 kt. Waves W 4 ft at 10 seconds. Rain.Thu night - SW winds 5 to 10 kt. Waves W 5 ft at 9 seconds. Fri - NW winds 5 to 15 kt. Waves W 6 ft at 9 seconds. Sat - SW winds 5 to 10 kt. Waves nw 5 ft at 8 seconds - .and W 3 ft at 15 seconds. Sun - NW winds 5 to 10 kt. Waves nw 8 ft at 12 seconds.

PZZ400 204 Am Pdt Wed Apr 24 2024
Synopsis for northern california waters - Calmer winds will lead to short period seas dropping below 6 feet through early Wednesday morning. Calmer conditions will persist with only minor and isolated enhancement of northerlies around cape mendocino through Thursday. Breezy northwesterly winds will return to the waters on Friday and should persist through Sunday.

FXUS66 KEKA 232127 AFDEKA

AREA FORECAST DISCUSSION National Weather Service Eureka CA 227 PM PDT Tue Apr 23 2024

SYNOPSIS
Showers and thunderstorms have developed across portions of interior this afternoon, mainly in Trinity county. A cooling trend will start today, then drastically cooler interior temperatures, rain and high mountain snow will develop Thursday through Friday. Additional showers and below normal temperatures are expected through the weekend.



DISCUSSION
An upper level low off the coast of Southern CA has generated southerly winds over the Central Valley today, advecting moisture over the Yolla Bollies and much of Trinity county.
Meanwhile, temperatures aloft have cooled as a weak shortwave moves overhead. These features have destabilized the lower levels and allowed convection to develop early this afternoon across Trinity county, with thunderstorms currently occurring over the mountains, and these are expected to continue for the next few hours at least.
Lapse rates aloft diminish through the afternoon to only around 6c/km and this may end convection by late afternoon.

Tuesday night is expected to be dry once the showers come to an end, although drizzle may form again along the coast. Wednesday widespread coastal stratus is expected to continue in the morning and may take some time to clear back to near the coast. Inland a few showers are possible again, but the threat for thunder looks lower than this afternoon. The flow aloft will be out of the west which is not a favorable pattern for convection, and soundings show a mid- level cap developing across much of our area. Wednesday night is expected to be mainly dry.

Thursday an upper level trough is expected to drop down from the northwest bringing cooler air and some rain to the area. At this point it looks like the rain will be starting in Humboldt and Del Norte counties in the morning and is expected to spread south and east in the afternoon. The front is expected to dissipate as it moves south with southern Mendocino and Lake counties receiving very little rain.

Friday and into the weekend the pattern remains cool and moist with zonal onshore flow through the column. Shortwaves are expected to move through this and bring some periods of light precipitation, primarily to the Redwood Coast. Overall amounts are expected to be light and snow levels will generally be above 4000 to 5000 feet.
Inland valley temperatures will likely see high temperatures struggle to get out of the 50s on Friday with only some slight warming going into the weekend. MKK



AVIATION
An offshore mesoscale low continues to migrate south toward a broad area of low pressure off the Mendocino coast, driving southwesterly return flow up the coastline. The marine inversion has deepened to 3,000 feet, effectively capping the coastal terminals beneath a thick layer of MVFR level stratus. Inland extent of stratus dissipated some this afternoon with diurnal heating, allowing UKI to see brief scattering of ceilings. Onshore WNW flow will resume this evening, helping to re-enhance the marine layer overnight. MVFR conditions will likely deteriorate to IFR early Wednesday morning as westerly winds subside along the coast. Reduced visibilities are possible at coastal terminals as low ceilings struggle to lift out. UKI will remain clear beneath low stratus as southerly winds diminish, becoming broken by Wednesday afternoon.



MARINE
Southerly winds gusts up to 35 mph were observed near Pt.
Arena and Crescent City this morning. These battling winds have generated a complex short period wave environment with combined significant heights of 5 to 7 feet. Winds have continued to weaken and will turn into a more northerly and onshore flow this evening and are forecasted to persist through Thursday. A series of mild cold fronts will lightly enhance winds, though gusts are forecasted to be moderate at best with 20 kt gusts restricted right around Cape Mendocino. Such winds will most likely not even be strong enough to even build short period seas to 6 feet. Though short period seas will dominate the sea state through the week, a series of persistent, mid period northwest swells up to 5 feet will generally compliment the northerly wind waves. Friday morning shows signs of more chaotic seas returning as strong north winds return, maxing out south of Cape Mendocino. DS



EKA WATCHES/WARNINGS/ADVISORIES
CA...
None.
NORTHWEST CALIFORNIA COASTAL WATERS...
None.

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