Marine Weather and Tide Forecast for Onalaska, WA

SHORT TERM /TONIGHT THROUGH THURSDAY/
A upper level low continues to move towards the northern OR coast, spinning up some moisture through western Washington. Recent radar imagery shows some scattered showers across the area this afternoon, mostly in the Cascades and the Olympics. Models have been suggesting once again a little bit of instability across the interior this afternoon with a potential of some thunder, with an isolated thunderstorm or two possible later this afternoon into the early part of the evening. Shower activity will continue into the evening before dissipating overnight, with high temperatures in the low to mid 60s.

As the aforementioned upper level low moves southeastward, the area will begin to dry out into Tuesday with a weak upper level ridge attempting to build into the area. Conditions look mostly dry Tuesday into Wednesday, with a chance of showers largely in the higher terrain in the Cascades and Olympics. High temperatures will remain in the lower to mid 60s for the interior, with mid to upper 50s for the coast and water adjacent locations.

Broad troughing looks to shift into our area Thursday and bring in a more showery weather pattern into the long term period.

LONG TERM /FRIDAY THROUGH MONDAY/
Ensembles are generally in consensus with upper level troughing returning to western Washington for the weekend. QPF values look rather light, but generally looking at a more unsettled showery weather pattern into the early half of next week. Temperatures remain largely unchanged during this time, staying in the low to mid 60s.

Mazurkiewicz

AVIATION
Upper level trough over Western Washington moving east Tuesday morning. Light flow aloft becoming northwesterly Tuesday morning. Light flow in the lower levels becoming onshore later tonight into Tuesday morning. Air mass slightly unstable through tonight.

Scattered to broken layer 4000 to 6000 feet. Showers over Southwest Washington until 04z with local ceilings near 2500 feet in showers. Slight chance of a thunderstorm until 04z. MVFR ceilings developing Tuesday morning 11z-14z with ceilings lifting back to VFR 18z-20z.

KSEA...Scattered to broken layer around 5000 feet. Ceilings lowering to around 2000 feet 12z Tuesday. Ceilings lifting back up to VFR 19z-20z. Northwest wind 4 to 8 knots becoming westerly around 03z and southerly around 06z. Felton

MARINE
High pressure will build over the coastal waters tonight with lower pressure inland. This pattern will remain intact through Wednesday night. Frontal system moving through the waters later Thursday into Thursday night. High pressure will build over the coastal waters for the weekend.

Small Craft Advisory westerly winds in the Central and Eastern Strait of Juan de Fuca tonight and again Tuesday night. Small craft advisory westerlies are possible Wednesday night.

Northwest winds 15 to 25 mph with seas 10 to 12 feet over the outer Coastal Waters Tuesday. Both the winds and seas will subside late Tuesday night. Felton

HYDROLOGY
The daily hydrology discussion has ended until the start of the next rainy season; it will only be included as needed.

SEW WATCHES/WARNINGS/ADVISORIES
WA...None.
PZ...Small Craft Advisory from 5 PM this afternoon to 5 AM PDT Tuesday for Central U.S. Waters Strait Of Juan De Fuca-East Entrance U.S. Waters Strait Of Juan De Fuca.

Small Craft Advisory from 5 PM this afternoon to 5 AM PDT Wednesday for Coastal Waters From Cape Flattery To James Island 10 To 60 Nm-Coastal Waters From James Island To Point Grenville 10 To 60 Nm-Coastal Waters From Point Grenville To Cape Shoalwater 10 To 60 Nm.