This is the Forecast Discussion from KSEA / Seattle WA NWS at Monday 01/06/2025 06:09:55 PST
SHORT TERM, today Monday into mid-week:
The main story for the next week is pretty benign weather for January in Western Washington.
Satellite imagery early this morning shows cloudy skies over most of the lowlands with mostly clear skies over the mountains.
Increasing northerly winds have dissipated some of the fog with a few places, like Bellingham and Everett still reporting a mile or less visibility.
Temperatures were mostly in the mid 40s.
Upper level ridge offshore building into Western Washington today.
The forecast problem for the day is how long the low clouds hang around in the lowlands.
Early morning top reports from aircraft flying into Seattle-Tacoma airport have the tops 2000-2500 msl and the cloud layer 1000-1500 feet thick. KOLM-KBLI gradient below -2 mb and will stay that way this morning so expect what is left of the fog to dissipate by mid morning.
The cloud cover is another matter. Subsidence from the upper level ridge building into the area will help compress the low level moisture layer but model soundings show light winds above the surface and the inversion not breaking until this afternoon.
1500 feet of moisture will take a little time to dissipate under these conditions.
Will word the forecast cloudy in the morning becoming sunny in the afternoon for most of the lowlands. It will be a sunny day in the higher elevations.
Highs today in the mid 40s to lower 50s.
Copy-pasted from the "Deep Weather" app on my iPhone 14