textproduct: Seattle/Tacoma

SYNOPSIS

A clear and mild afternoon will continue across western Washington as high pressure builds in. A partly cloudy but dry weekend is in store, with only weak passing systems expected into next week. A stronger system is possible late next week into next weekend.

SHORT TERM /TODAY THROUGH SUNDAY NIGHT/

It is a pleasant afternoon out there as high pressure builds in and sunshine returns. Temperatures will cool a bit over the weekend into the upper 40s, but periods of sunshine will break through the clouds at times. A weak disturbance moving through tomorrow could generate a few afternoon showers, but the likelihood is higher in the majority of the region remaining mostly dry. Low temperatures will also be coming down in the mid 30s over the weekend, with 20s in the Cascade foothills and at the pass levels. Winds will be light and generally northeasterly throughout the weekend.

LONG TERM /MONDAY THROUGH THURSDAY/

Generally quiet weather persists through much of the week. As high pressure remains offshore, expect a few weak disturbances to move through the area and generate some precipitation. Light rain is possible Monday evening lasting through Tuesday morning and then again Wednesday afternoon into Thursday. In each of these systems, some light mountain snow is possible but won't accumulate to particularly impactful amounts. In between these periods of rain, expect it to be mostly cloudy.

The deterministic model runs are suggesting a more potent system possible late in the week, while the ensemble cluster analysis shows more of a ridge dominance. More details will emerge as the week progresses.

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AVIATION

VFR presently across all terminals, and will persist through the afternoon and much of the evening hours. North to northeasterly winds will continue throughout the TAF period, remaining gusty between 25-30 kts at KBLI through 01Z-02Z. Some mid and upper level clouds will begin to filter into the area this afternoon and evening. Coupled with continued northeasterly flow, confidence in fog tomorrow morning is limited. Areas south of OLM could see patchy fog, but will likely not be widespread.

KSEA... VFR at the terminal this afternoon with northeasterly winds of 10 kts. Wind speeds will ease below 7 kts this afternoon between 00Z and 01Z, but remain northeasterly. The model guidance still isn't latching on to a definitive fog event in the morning, but have opted to keep some lower SCT clouds in the TAF with a ceiling not less than 3000 feet. VFR expected throughout the day tomorrow.

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MARINE

Easterly/northeasterly offshore winds continuing across portions of the waters this afternoon with high pressure over the area. These are most prominent across the northern inland waters and near the western Strait of Juan de Fuca, where small craft advisories remain in effect until later this afternoon. Seas are diminishing today, with only a slight bump back to around 7 ft Sunday. Expect increasing winds and building seas late Monday into Tuesday over the outer coastal waters as a weak front approaches, but otherwise high pressure generally in control through the forecast period. 12

HYDROLOGY

Flooding is not expected over the next 7 days.

SEW WATCHES/WARNINGS/ADVISORIES

WA...None. PZ...Small Craft Advisory until 2 PM PST this afternoon 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 Point Grenville To Cape Shoalwater 10 To 60 Nm-Coastal Waters From Point Grenville To Cape Shoalwater Out 10 Nm-Grays Harbor Bar-West Entrance U.S. Waters Strait Of Juan De Fuca.

Small Craft Advisory until 4 PM PST this afternoon for East Entrance U.S. Waters Strait Of Juan De Fuca-Northern Inland Waters Including The San Juan Islands.