Marine Weather and Tide Forecast for Onalaska, WA

SHORT TERM /TONIGHT THROUGH TUESDAY NIGHT/
The latest forecast remains on track with no updates this evening. A weak round of showers will move onshore tonight and into Monday morning, dissipating throughout the day. Light snow accumulations will continue, with 2 to 4 inches likely at Stevens and Snoqualmie Passes. High temperatures in the upper 40s and lower 50s.

Showers will taper by Tuesday evening as the pattern splits, and weak upper level ridging nudges into the area. High temps in the low 50s.

LONG TERM /WEDNESDAY THROUGH SUNDAY/
Weak upper level ridging will keep the western Washington mostly dry on Wednesday, with areas of fog in the morning. The ridge begins to flatten into Thursday, allowing for more southwest flow and systems to approach the area. Precipitation chances increase late Thursday into Friday, with troughing likely into the weekend with unsettled weather and cooler temperatures.

Mazurkiewicz

AVIATION
A mix of VFR to MVFR conditions this evening as low-level moisture remains a concern over portions of W WA. A weak incoming frontal system will make for widespread MVFR conditions overnight with the chance for some scattered showers.
Confidence on these showers remains a little shaky /except for along the coast/ as latest guidance doesn't seem to be entirely convinced either with regards to significant impacts to terminals
Inherited forecast covers this with VCSH
and this remains the best way to go at this time. VFR conditions are expected to return to most terminals by Monday afternoon.

The main impact from the front will be an increase in southerly surface winds with most locations seeing speeds increase to 6-12 kts early Monday morning and remain that way for the remainder of the TAF period.

KSEA...VFR conditions in place this evening and should hang on into tonight...although an occasional dip to high-end MVFR at times cannot be ruled out, as it has already occurred a few times this evening. More confidence in MVFR conditions emerging early Monday morning around 12-13Z, where precip potential may reach its peak.
Some threat will linger into the afternoon hours, but drying is expected to kick in by 00Z. As mentioned above, southerly winds throughout the TAF period with speeds generally ranging 6-12 kts.
The strongest winds are expected throughout Monday morning and afternoon...then starting to ease after that.

18

MARINE
Winds over area waters will remain generally light this evening. A weak frontal system will moving across area waters on Monday will boost winds somewhat, but are expected to remain well below small craft advisory thresholds. Seas running around 8 to 9 ft are expected to rise slightly to around 10 to 11 ft at 11 to 12 seconds tonight into Monday. Seas then fall Tuesday to around 5 to 7 ft through Thursday when seas look to rise back up above 10 ft. A small craft advisory for seas remains in effect through Monday afternoon. Benign marine conditions return Tuesday and Wednesday as broad high pressure briefly builds across the area. The next frontal system will move through the area Thursday into Friday bringing the potential far another round of marine headlines and impacts.

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

SEW WATCHES/WARNINGS/ADVISORIES
WA...None.
PZ...Small Craft Advisory until 4 PM PST Monday 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-Coastal Waters From Point Grenville To Cape Shoalwater 10 To 60 Nm-Coastal Waters From Point Grenville To Cape Shoalwater Out 10 Nm.