I always thought it was cool how Grand Rapids does an extended prelude! Actually starting to get a bit excited, considering my state of mind at this time last year, staring down the barrel of december torch.
"Change to colder follow next big storm
This is where it gets interesting. Due to the MJO going into Phase
8, which is cold for a large part of the central and northern
CONUS we are likely to get back into the deep freeze after the 6th
of December. This is well supported by the ensembles of both the
GFS and ECWMF. In fact the latest model runs show part of the
northern Midwest into Montana with a 5 day departure from normal
over 20 degrees below normal! We will need to watch this closely,
this could have significant impacts on our area."