textproduct: Seattle/Tacoma

SYNOPSIS

Another round of onshore flow and stratus clouds are expected today, with light drizzle expected at times. High pressure noses back in Wednesday and Thursday for clearing skies and warming temperatures. Increased cloud cover is again expected late in the week as a dry front moves through the region. Stronger high pressure and offshore flow is indicated for next week.

SHORT TERM /TODAY THROUGH THURSDAY/

Low clouds and stratus continue across western Washington this morning as onshore flow continues. Expect another day of clouds and isolated pockets of drizzle today with cooler temperatures in the upper 50s and low 60s. Afternoon highs from Wednesday through the end of the week are suggestive of minor HeatRisk. After today, high pressure builds into the area for the middle of the week, gradually decreasing the cloud cover and bringing the temperatures back into the upper 60s and even low 70s by Thursday. Outside of diurnal westerly winds through the Strait of Juan de Fuca, much of the Puget Sound region should see light northerly winds.

A dry front will progress through on Thursday as the high pressure scoots east, bringing clouds back in the later half of the day.

AVIATION

High pressure remains offshore today with low level onshore flow at the surface. A weak disturbance in the northerly flow may generate isolated light showers, mainly within a wide band currently passing through the eastern half of the Olympic Peninsula and portions of the east side of the Sound. Wide range of cigs this morning with pockets of VFR conditions in the far south and far north of the CWA, the majority of forecast terminals seeing MVFR conditions and a couple of isolated IFR locations...including PAE at the time of this writing. General trend for lifting and scattering of low clouds throughout the day today remains on track, with widespread VFR with SCT-BKN around 5000 ft expected over most terminals by this evening. Clouds will continue to lift and gradually scatter overnight and into Wednesday morning...except perhaps along the coast, including HQM. 33/18

KSEA...Lingering MVFR conditions with cigs right around 2500 ft and some SCT low-level clouds generally 1000-1500 ft. Gradual improvement throughout the day still expected, with SCT-BKN cigs around 5000 ft this afternoon and the remainder of the TAF period. S/SW wind up to 10 kt becoming W and NW/N around 5 kt after 00z. 33/18

MARINE

High pressure remains offshore with lower pressure inland, maintaining onshore flow. A stronger onshore push is forecast down the Strait of Juan de Fuca Thursday afternoon and evening with cold front. 33

HYDROLOGY

No river flooding is expected over the next 7 days.

SEW WATCHES/WARNINGS/ADVISORIES

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