Marine Weather and Tide Forecast for Vashon, WA

SHORT TERM /TODAY THROUGH WEDNESDAY/
Classic convergence zone over King County overnight with onshore flow and troughing overhead. So far the central Cascade passes look bare/wet but could still see light snow at both Stevens and Snoqualmie Pass with snow levels lowering to around 2500 ft. But in general, the convergence zone will fade this morning as the trough exits east.
Temperatures will track cooler than average with highs in the 50s today. Lows will drop into the 30s and lower 40s tonight, with lower 30s around the south sound. There's a low chance (10 percent) of seeing freezing conditions in the south sound. If so, due to clearing and light winds, it would be brief in duration.

We're under dry N/NW flow on Tuesday with high pressure offshore.
Temperatures are a little warmer and in the lower 60s in the interior, with 50s elsewhere. Lows will be cool and in the 30s and lower 40s again. The ridge shifts inland on Wednesday for sunny skies and highs in the 60s throughout. 33

LONG TERM /THURSDAY THROUGH SUNDAY/
High pressure brings one more dry and warm day on Thursday with temperatures peaking in the 60s and 70s. A trough then brings showers and cooler conditions moving into Friday. Rain and cooler weather follows into the weekend with a broad trough over the West. Sunday is a little drier and warmer (near normal) as the low center shifts toward the Great Basin. 33

AVIATION
An upper level trough is currently progressing through western WA this morning with a jet max over the state, creating strong northwesterly flow aloft until later today. A few areas of showers continue across some of the terminals this morning. The showers up in Skagit/Whatcom Counties continue to move southeast with light/moderate rain. Down in King County (between I-90 and the Snohomish County line), the convergence zone continues, remaining stationary with light/moderate rain. A few scattered/isolated showers were also tracking southeast along the Pacific Coast. The ceilings remain broken to overcast across, with the lowest CIGs (MVFR) associated with the convergence zone affecting KSEA and KBFI.
Most of the showers will wind down around 12Z this morning (with a few lingering in areas near the north Cascades through roughly 00Z).
Throughout the day today, MVFR ceilings will be associated with showers north of I-90 through the afternoon, with remaining areas seeing lower VFR ceilings with clearing taking place this evening.
Lower visibilities down to 3 SM with mist is possible with the heavier showers.

Winds continue to decrease along the Strait of Juan de Fuca this morning (with a few gusts to 20-25 kt possible through sunrise).
Northwest winds of 5 to 10 kt will be found in areas west of the Olympics. In the South Interior (around KOLM), the winds will be more westerly at the same magnitude. For the North Interior (KBLI), winds will be out of the southwest, with lighter winds down to 5 kt tonight/Tuesday morning. Finally, in Puget Sound, winds will become solidly southerly this morning at around 4 to 8 kt, with a turn to the west/northwest taking place around 00Z (decreasing to less than 5 kt).

KSEA...Convergence zone just north of the terminal will continue this morning through roughly 12Z. The showers are expected to remain to the north of the terminal at this point. Ceilings will likely remain MVFR until the convergence zone vastly dissipates, but ceilings will still remain overcast on the low-end of VFR. More clearing is expected tonight/Tuesday morning. Winds have turned back to the south at around 8 kt this morning, and will become more westerly this afternoon to northwest sometime after 00Z. The magnitude of the wind will decrease at or below 5 kt tonight.

HPR

MARINE
A trough sits over inland WA this morning, with high pressure beginning to build out in the coastal waters this morning.
This will keep the flow pattern northwesterly/onshore through next Thursday/Friday before another potential disturbance tracks towards the region.

Post trough, a few breezy spots remain out on Smith Island and far in the northern coastal waters. Sustained winds have dropped at or below 20 kt, with gusts not exceeding 25 kt. Given the downward trend in the observations, will allow the small craft advisories to expire at 3 AM this morning in the central/east Strait of Juan de Fuca, and 11 AM for the northern two thirds of the coastal waters/west Strait of Juan de Fuca. The winds will decrease this morning, and will remain benign through the week. The front Thursday/Friday is not expected to produce hazardous winds at this time, but may change as higher resolution guidance becomes available.

The seas will decrease from 8 to 10 feet this morning down to 5 to 7 feet Tuesday (periods will increase from 9 seconds to 11 seconds Tuesday). Expect a further drop down to 3 to 5 feet Thursday before increasing back up to 6 to 9 feet on Saturday.

HPR

HYDROLOGY
No river flooding is expected during the next 7 days.

SEW WATCHES/WARNINGS/ADVISORIES
WA...None.
PZ...Small Craft Advisory until 3 AM PDT early this morning for Central U.S. Waters Strait Of Juan De Fuca-East Entrance U.S. Waters Strait Of Juan De Fuca-West Entrance U.S.
Waters Strait Of Juan De Fuca.

Small Craft Advisory until 11 AM PDT this morning 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.