textproduct: Seattle/Tacoma

SYNOPSIS

A strong high pressure system will remain in place over the Northwest through the weekend and into next week. The ridge will begin to flatten somewhat by the middle of next week, with a chance for precipitation returning late next week.

SHORT TERM /TONIGHT THROUGH SUNDAY NIGHT/

East winds are continuing in the Cascades and the gaps this afternoon, and skies have cleared across western Washington. Northerly winds persist through Puget Sound with some obs getting between 20-25 mph. This wind profile will continue into Saturday, although at slightly slower speeds. With the drying effects of easterly winds, the minimum relative humidities have been lowered, particularly in the southern Washington Cascades.

The ridge will position itself more overhead over the weekend, for continued clear skies with afternoon highs around 50 and lows in the 30s.

LONG TERM /MONDAY THROUGH FRIDAY/

Dry weather holds on as the ridge remains in place through the first half of the week. By midweek, the ridge is forecast to flatten, opening the door a touch for weak systems to brush the region. QPF returns to the forecast, although light at this time, on Thursday into the later half of the week.

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AVIATION

High pressure will remain offshore with primary terminals remaining VFR under clear skies and east/northeast surface winds. Expect to see developing low clouds again tonight in isolated pockets as early as 06z with some increased patches toward 09z tonight. However, areas that continue to see a light east breeze may remain well mixed and unable to fully fog in. Regardless, shallow fog that does develop should mix out rather quickly Saturday with VFR conditions under generally clear skies in the afternoon.

KSEA...VFR tonight with breezy east/northeast surface winds to 15 kt gradually easing toward 06-08z. Fog development chances remain low (<20%)this evening, with enough of an east wind likely to keep conditions mixed. However, if it does develop it's likely to be with ceilings at/below 500 ft. VFR conditions under clear skies during the day Saturday.

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MARINE

High pressure will remain offshore through the weekend into next week, with a thermal trough along the shore. Few gusty spots will see winds decrease this afternoon in the coastal waters (with the last remaining small craft advisories expiring this afternoon for gusty east winds). There are no wind concerns through the next seven days, with the next weather system potentially arriving late next week.

Seas will remain at 4-6 ft through the forecast period.

HPR

HYDROLOGY

No river flooding is expected in the next 7 days.

SEW WATCHES/WARNINGS/ADVISORIES

WA...None. PZ...None.