This has been bugging me for the past couple of days. The models show warm
air being pumped over Greenland, which is instrumental in bringing the
impending colder spell.

However, if you take a look at:

http://217.160.75.104/pics/Rtavn962.gif

for example, you'll see the air that's moving eastwards from Greenland is
positively tropical - 555dam, +12C at 850hPa. I could perhaps understand
some warming due to a Foehn effect, but surely that wouldn't explain such
warming....

FWIW the chart for 24 hours earlier shows the mild pool at +8C:

http://217.160.75.104/pics/Rtavn722.gif