Marine Weather and Tide Forecast for Bellingham, WA

FXUS66 KSEW 170404 AFDSEW

Area Forecast Discussion National Weather Service Seattle WA 904 PM PDT Fri May 16 2025

SYNOPSIS
Cloudy and showery conditions will continue across the region through the weekend with temperatures remaining below normal. The chance of thunderstorms will increase to around 20 percent across much of the region Saturday afternoon. Showers continue through the start of next week as the pattern remains somewhat active. A shift to warmer conditions is possible late next week.

SHORT TERM /TONIGHT THROUGH MONDAY/
Satellite imagery shows cloudy skies over Western Washington. Doppler radar has showers from about Everett northward and along the coast. Temperatures at 9 pm/04z were in the 50s.

Forecast on track tonight with upper level trough offshore moving into Western Washington Saturday keeping showers in the forecast.
Slight chance of thunderstorms Saturday afternoon with the trough axis right overhead. Felton

Previous discussion...More showers are headed our way tonight and Saturday as an upper level trough moves in. Showers will be enhanced during the afternoon with the passing trough axis and a convergence zone developing in the interior. The air mass will be slightly unstable with a chance of thunderstorms too. Up in the mountains, snow levels will lower from around 4500' down to 3500' Saturday night and the Cascades may see light snowfall accumulations.

A cool upper low remains overhead on Sunday for more clouds, light showers, and overall cool conditions. Most of she shower activity remains over the Cascades where snow levels stay low (3500-4500').

We'll see a brief break in the weather with a ridge late Sunday, then more rain on Monday with the next frontal system. Temperatures remain cooler than average with highs around 60 degrees. 33

LONG TERM /TUESDAY THROUGH FRIDAY/
There is broad troughing over the Pac NW next week with ongoing onshore flow. A series of weak upper level systems will clip the area for a chance of showers through the period. Late in the week (and next weekend)
there are signs of warmer and drier weather with stronger ridging over the region. The majority of the ensemble members show highs reaching the 70s over the weekend. 33

AVIATION
Westerly flow becoming southwesterly tonight as the next in a series of upper troughs and associated weak fronts approaches Western Washington. The air mass remains moist with widespread MVFR to pockets of IFR ceilings. Shower coverage will increase overnight into early Saturday with ceilings remaining around MVFR to IFR.

KSEA...Low end VFR improvement is expected to be brief. Showers will increase late tonight into Saturday with low MVFR or occasional IFR ceilings. Surface winds S/SW 7 knots or less turning light and variable during the overnight period then returning to S/SW and increasing to 8 to 12 knots by later Saturday afternoon. 27/McMillian
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