textproduct: Eureka

KEY MESSAGES

* A general troughing pattern will bring additional light rain over the region Thursday and periods of unsettled weather over the weekend.

* Overnight temperatures for the interior will turn chilly, bringing chances for frost Friday morning and through the weekend.

SYNOPSIS

Winds subside Wednesday evening, while rainfall turns lighter as a storm system moves through. Light rainfall chances continue Thursday as a weaker area of low pressure moves by. Overnight temperatures for the interior will turn chilly, bringing chances for frost Friday morning and through the weekend. A general troughing pattern will bring additional light rain over the region Thursday and periods of unsettled weather over the weekend.

DISCUSSION

The Wind Advisories are verifying with strong gusts recorded over coastal Del Norte and the higher elevations. Weakened summertime limbs and branches have been coming down, so caution is recommended until winds turn lighter through late tonight. Rainfall will turn light and showery as well. A second colder and somewhat unstable area of low pressure will then move by Thursday. This will continue the chances for showers and perhaps a couple coastal thunderstorms.

As the environment attempts to clear out through Friday morning, much cooler overnight lows will develop for the interior. If clouds do clear out and fog is not achieved, areas of frost will be likely for the interior. There is still some question of clearing amounts or even additional light showers, especially with the numerous troughs forecast through the weekend. These will also bring a shot for some isolated thunderstorms.

The broad upper low to the north will stall ahead of blocked flow through the weekend, with weaker shortwave disturbances rotating in. More at least weak troughing may redevelop behind it. This gives mixed signals for the extended outlook. There will looks to be some sort warmup early to mid next week, but if it occurs, it should be short lived if the troughs continue moving through.

AVIATION

The main concern through this evening is the strong southerly winds. A southerly jet of 40 to 50 kt through 2000 ft AGL will continue the threat for low level wind shear for the coastal terminals through the afternoon before it quickly passes after 03Z Thursday. Moderate to locally heavy rainfall will also lower VIS and CIGs, likely brining periods of IFR or LIFR conditions. Patchy areas of fog may also form through the early morning hours Thursday. Probabilities for IFR CIGs lower to 45% by 15Z Thursday for ACV, and are lower for CEC. Ceilings at UKI will likely lower near or below 1500 AGL through tonight with the light rainfall.

MARINE

Strong southerly winds and gale conditions quickly pass Wednesday evening. Wind driven seas up to 9 ft will subside below 5 ft going into early Thursday morning. A trough from the north will then drive in a steep NW swell in around 7 to 9 ft at 11 seconds. If the swell comes in larger near 10 ft then advisory level conditions will be met. Mariners in small crafts should exercise caution on this day for this potential threat. Otherwise winds will be light more most of the waters through Saturday. The northerlies will strengthen some through the weekend, mainly over the southern water south of Cape Mendocino. The northerlies do not look to fully strengthen again until early next week. Hurricane Marie will deliver a long period southerly swell Saturday. Though small, at around 4 ft at 16 seconds, this is a larger than typical swell from this direction.

BEACH HAZARDS

Hurricane Marie will deliver a long period southerly swell into the water Saturday up to 3-4 feet at 16 seconds for south facing coastline. This will create a risk for sneaker waves, especially if the swell comes in slightly larger.

Sneaker waves are a unique hazard, with up to 30 minutes between waves. Large, unexpected waves can sweep across the beach without warning, sweeping people into the sea from rocks, jetties, and beaches. These sneaker waves can also move large objects such as logs, crushing anyone caught underneath. Even ankle to knee deep water can knock you down and drag you out when a sneaker wave hits. Pay attention and stay above the high water line and any wet sand to stay safe. If the ground is wet, waves have surged there recently. Stay safe and never turn your back on the ocean!

EKA WATCHES/WARNINGS/ADVISORIES

CA... Wind Advisory until 8 PM PDT this evening for CAZ101-102- 104>106.

NORTHWEST CALIFORNIA COASTAL WATERS... Gale Warning until 6 PM PDT this evening for PZZ450-470.

Small Craft Advisory until 10 PM PDT this evening for PZZ455.

Small Craft Advisory until 10 PM PDT this evening for PZZ475.