Cold and snow coming soon, #BOTS!

.LONG TERM /Tuesday through Friday/...
Issued at 220 AM EST Sat Dec 2 2017

High confidence that temperatures will be plummeting early in the
long term. Models in good agreement that a strong cold front will
sweep east across central Indiana early Tuesday. The 00z GFS and
Canadian runs were quicker than 12z ECMWF were around 6 hours
quicker with this front and lingering QPF. The blend seemed to side
closer to the ECMWF solution. Confidence in exact timing is not
great, but either way the bulk of the showers should end no later
than Tuesday afternoon and likely earlier and temperatures will be
falling in cold post-frontal advection.

The next issue will be temperatures as models agree that various
waves and high amplitude western ridging will allow for a deep
trough to expand south and eastward over the Great Lakes and Ohio
Valley through the remainder of next week. Model 850 millibar
temperatures fall all the way to the negative teens late next week.
This modified arctic airmass suggests late week temperatures may
struggle to reach the freezing mark over our far northern counties.
Canadian and GFS in particular suggest a clipper system will drop
southeast across the area Thursday night and Friday with the
potential for our first light snow accumulation possible. Overall,
blend temperatures may not be cold enough.