12z shows that heavier moisture doesn't move through the Portland area until a little later in the afternoon on Monday. Definitely doesn't look good our small snow chances.
Yeah, I would ignore all of the sticking snow before Monday night. There will probably be a lot of snowflakes in the air in the valley, but I don't see it sticking until later.
The 12z definitely looks good for snow Tuesday morning as the low dies southward right near the Portland area. It actually looks to show fairly heavy rates.
Seems like a pretty weenie way to look at things. Why would you predict the low to be mostly dry when models are actually trending wetter as we get closer?