textproduct: Seattle/Tacoma

SYNOPSIS

The low pressure system is now along the western coast of Vancouver Island, and has weakened to a point where it will not cause headline worthy wind speeds. Pockets of light precipitation are expected to continue, with light rain again tomorrow. Temperatures cool off this weekend, with lows in the low to mid 30s. Upper level ridging is expected late in the weekend to early next week.

SHORT TERM /TONIGHT THROUGH FRIDAY NIGHT/

Earlier this afternoon, all of the wind advisories were cancelled due to the low pressure system weakening and moving outside of the area. While it is now along the western coast of Vancouver Island, the system de-coupled from its upper level support and moved north faster than the models could latch on to. Some breeziness can be expected throughout the rest of the afternoon and into the early evening. Given the antecedent soil saturation and weakened state of the trees, not having high winds materialize is the most favorable scenario.

Tomorrow, expect additional accumulations of light rain, though nothing impactful is expected of it. Only a few tenths of an inch area wide are expected by the end of the afternoon. Expect light northeasterly winds throughout the day. Temperatures will be in the mid 40s.

LONG TERM /SATURDAY THROUGH WEDNESDAY/

The weekend will feature drier weather as upper level ridging develops offshore. Afternoon highs will dip into the low 40s with lows in the 30s, approaching freezing by Sunday morning. With upper level ridging in place, more widespread fog and stratus development may be of concern into early next week. The pattern will be monitored into next week to keep an eye on any indication that the pattern may become more active, but for now, it looks like a much more mild end to 2025.

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AVIATION

S to SSW flow aloft through the period as an upper-level trough meanders offshore. A mix of VFR to IFR so far this afternoon with the trend lasting into tonight. Wind gusts are beginning to peak at this hour with gusts up to 25-30 kt recording over the Puget Sound terminals. Winds are forecast to decrease after 00z tonight. Decreasing winds and clearing skies will lead to fog development, with terminals such as KOLM & KPWT seeing the best chance for LIFR conditions emanating as a result by 06-08z. An additional disturbance will arrive Thursday morning with rain showers and the possibility for another round of lowered ceilings into the afternoon.

KSEA...Ceilings continue to vary this afternoon between VFR/MVFR. This trends looks to persist into the evening before mostly VFR becomes more common tonight. Decreasing clouds and winds may allow for patchy fog development across the area but latest hi-res has a less than 10% chance of visibility less than 1sm for KSEA into Thursday morning. MVFR cigs again tomorrow afternoon as the next disturbance arrives.

McMillian

MARINE

A weakening surface low has pushed well into BC this afternoon. Latest wind forecast have continued to decrease drastically, allowing for gales over interior waters to be downgraded to SCAs along with the coastal waters. SCAs over the inland waters should be allowed to expire this evening. Moving onward, a broad surface trough well to the south of the area and high pressure over the interior of British Columbia will lead to a period of northerly flow into Friday. Surface high pressure will build across the waters this weekend for a quieter period. Winds easing over the weekend but with the lighter winds comes a threat of thick fog.

Seas building to near 10 feet Friday before subsiding for the weekend. McMillian

HYDROLOGY

Rivers across western Washington continue to trend downward. Rainfall through Friday is not expected to cause any additional rises to area rivers. With the lower rain rates and a possible dry spell coming up the threat of landslides has decreased across western Washington. Felton

SEW WATCHES/WARNINGS/ADVISORIES

WA...Wind Advisory from 7 PM this evening to 1 AM PST Thursday for Foothills and Valleys of Central King County-Foothills and Valleys of Pierce and Southern King Counties- Foothills and Valleys of Snohomish and Northern King Counties-Foothills and Valleys of Thurston and Lewis Counties-Foothills and Valleys of the North Cascades.

PZ...Small Craft Advisory until midnight PST tonight for Coastal Waters From Cape Flattery To James Island 10 To 60 Nm- Coastal Waters From Cape Flattery To James Island Out 10 Nm-Coastal Waters From James Island To Point Grenville 10 To 60 Nm-Coastal Waters From James Island To Point Grenville Out 10 Nm-Coastal Waters From Point Grenville To Cape Shoalwater 10 To 60 Nm-Coastal Waters From Point Grenville To Cape Shoalwater Out 10 Nm-West Entrance U.S. Waters Strait Of Juan De Fuca.

Small Craft Advisory until 1 AM PST Thursday for Central U.S. Waters Strait Of Juan De Fuca.

Small Craft Advisory until 7 PM PST this evening for Admiralty Inlet-East Entrance U.S. Waters Strait Of Juan De Fuca- Northern Inland Waters Including The San Juan Islands- Puget Sound and Hood Canal.