From www.nwac.us:

So the New Year’s arrived,
And the rains have begun—
Going out right now,
Shouldn’t be much fun.

Best to wait for a bit,
And let temperatures cool—
It’s better for safety,
As a general rule.

A warming snowpack,
Stressed out by rain—
Can be a real problem,
More than just a pain.

But tonight freezing levels lower,
Rain turns to snow showers—
The old snow refreezes,
And strengthens with the hours.

Tomorrow holds a promise,
Of more moderate snow—
Except near Mt Hood,
Where it may be best not to go.

Then after a break on Thursday,
The jetstream roars back—
And laden with moisture,
The Northwest will attack.

Heavy snow, strong winds,
Friday looks bleak—
And heavy showers persist,
Through the end of the week.

While extended range models,
Sometimes lack in precision,
The trends shown above,
Should aid your decision.

Know that Thursday’s “break”,
May add a weak layer—
Like surface hoar or powder,
Stuff we all like to savor.

So late this week,
When the danger’s high—
If you challenge the snow,
This rhyming won’t lie.

And as yet more snow arrives,
Over the weekend too—
If it warms on Sunday,
Best bid the mountains adieu!