textproduct: Seattle/Tacoma

SYNOPSIS

A high pressure ridge will build inland Thursday through Saturday, bringing dry and warmer conditions. Wet conditions are on track to return by the end of the weekend and into early next week as troughing returns.

UPDATE

Forecast remains on track this evening as shower coverage is becoming less widespread and generally pushing into the mountains and a few near the coast. It'll still be a quite cool night and temperatures may be cold enough for a few patches of frost south of Puget Sound through Lewis County. No other concerns this evening, with the previous short/long term sections following.

LONG TERM /SUNDAY THROUGH WEDNESDAY/

High pressure will shift eastward on Sunday as a trough moves in from the west. Clouds will increase through the day with rain, from the next incoming system, reaching the coast during the afternoon. Expect one last dry day in the interior with highs in the lower to mid 60s. Precipitation spreads farther inland Sunday night as the cold front moves in. We're under moist, westerly flow, through early next week for more rain and locally windy weather. 33

AVIATION

Northerly flow aloft as a offshore ridge nudges closer to western Washington. Widespread VFR conditions this evening and, for most terminals, expected to persist throughout the TAF period. Locations more prone to lower cigs, such as OLM, HQM and PWT, may see cigs dip into MVFR overnight/early Thursday morning thanks to lingering low level moisture as the aforementioned ridge sets up. Showers continue to dissipate this evening, likely fizzling out completely tonight. Winds in process of shifting direction at the time of this writing...so while most terminals still showing west to southwesterly winds, seeing the northernmost terminals already switching to north to northwesterly with speeds generally 4-8 kts now. Speeds expected to slow further overnight, easing to 5 kts or less.

KSEA...VFR conditions expected at the terminal for the TAF period. W winds 4 to 8 knots still have a little bit of time to switch more northwesterly before 06Z, when direction is expected to switch back to a more southerly component throughout the rest of the overnight and into Thursday morning. While VFR will likely continue through the TAF period, but there is a 35% chance of low MVFR clouds to develop early Thursday morning.

Mazurkiewicz/18

MARINE

Surface high pressure will continue to build offshore, easing marine winds and seas through the rest of the week. Benign conditions will continue through the weekend, before a frontal system approaches the waters Sunday evening. Here, we will likely see elevated winds and seas return to the coastal waters.

Combined seas 5 to 7 feet this afternoon will start to taper down to 3 to 5 feet through the rest of the week and into the weekend. Seas will start to gradually build upwards by Sunday ranging from 9 to 12 feet.

Mazurkiewicz

HYDROLOGY.

No river flooding is expected over the next 7 days.

SEW WATCHES/WARNINGS/ADVISORIES

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