NOAA:
Attention turns to a shortwave of Pacific Northwest origin which is
now rounding a flat upper ridge as it tracks from the northern
plains to upper midwest this morning. This wave will arrive in the
central Great Lakes on Monday and bring widespread precipitation.
Cold air in place on the edge of the arctic high will be sufficient
to allow for a fair amount of the precipitation to fall as snow,
especially from M-59 north. Further south, more of a wintry mix will
be possible given the degree of a warm layer that noses over the
edge of the modified arctic air mass. Here, snow/sleet with some
possible freezing rain/rain as temperatures hover in the lower 30s
into afternoon after starting in the 20s earlier in the day.
Model trends this evening continue to bring higher QPF amounts into
the area as a decent FGEN signal emerges with the associated low
pressure system that develops as the shortwave crosses the area.
Model spread remains relatively high in this regard though so the
overall confidence (while improving) remains suspect. That said,
HiRes solutions do point to higher snowfall amounts into the M-59
corridor with some accumulations possible further south.
Will be upping the snow forecast with a fairly broad-brushed 2-5
inches from M-59 north. In reality, the heavier swath of precip/snow
will most likely focus along the narrower FGEN feature with tapering
amounts on either side of this better forcing which works through
the area from mid afternoon into early evening after a more general
area of isentropic lift produces a more widespread lighter precip
shield from mid/late morning into the early afternoon.
Thanks @Tom! Are you dreaming of a White Christmas? When was your last one?
Speaking of that cold air. -10F here this morning is even colder than the cold blast in January. Since snapping this, I see Grayling area at -19F. My NWS forecast was calling for -6F so the cold overachieved here.
And this in my 5-day:
This will be a good snowmaker coming for some for tomorrow:
NOAA:
.KEY MESSAGES...
- After a cold start with early morning temperatures ranging from
around zero I-69 north to around 10 Detroit south, daytime highs
will remain chilly and range in the 20s today.
- Snow accumulation potential for a shortwave arriving on Monday
continues to increase with several inches of snow expected from
midday into the early evening.
- Highest snowfall amounts continue to focus from between M-59 and
I-69 north, but with some accumulations of sleet or snow possible
further to the south as well.
I believe there's a good possibility we will see a southerly trend with the New Years eve storm. The pattern is about to really get blocked up, the operational models are already starting to pick up on this.