Should you really feel some stress in your brow in the present day, there could also be a trigger.
Proper now, the Northwest is experiencing unusually excessive atmospheric stress.
In truth, the third highest stress previously 25 years, hitting round 1042 hPa, one thing proven by the plot of pressures at SeaTac under (the dashed purple line exhibits the best stress noticed yesterday).
This uber-high stress has been suppressing water ranges, ensuing within the excessive tides at Seattle being far lower than would have occurred below regular stress (see under, purple is noticed, blue is predicted)
Later tonight and tomorrow morning, a entrance will transfer via, bringing some rain to the lowlands and snow to the mountains.  Nothing distinctive.
After which the chilly enjoyable begins on Saturday. That morning, chilly air (purple and blue colours) will begin transferring in from the Northeast.
And by Sunday morning can have unfold over the whole area.
The chilly air will convey excessive sea stage stress and enormous stress variations that can drive sturdy winds in and downstream of gaps in our terrain. Â
As proven within the wind gust forecasts for Sunday morning, highly effective northeasterly winds to push out of the Fraser River Valley into Northwest Washington, and downslope easterly winds will descend the Cascades from North Bend to Enumclaw, transferring westward in and south of Sea-Tac. Some bumpy landings may be anticipated.
And now I’m going to disappoint a few of you. Just about no lowland snow will accompany the chilly air. The set-up is simply mistaken.
Beneath is the amassed snowfall via Sunday at 4 AM.Â
Maybe a couple of flakes between Portland and Chehalis, however aside from that, all snow will likely be at larger elevations.  Good quantities within the Rockies.
Sunday and Monday mornings will likely be fairly chilly (within the mid-20s over the western lowlands), so disconnect hoses and hold your pets indoors.
