Thursday night into Friday, an area of low pressure will track
northeast across the Central Great Lakes, occluding in the process.
Precipitation will overspread the region as the area of low pressure
tracks across the Great Lakes. First the warm front associated with
the system will track northeast across the area through Friday
morning, followed by the cold front for the afternoon.
Proximity to the triple point for the area of low pressure will be
important for temperatures and precip types for this event. Guidance
is split on triple point location and how quickly the cold front
moves through. Some guidance brings stronger warm air advection
north ahead of the cold front Friday morning allowing sfc temps. to
warm a bit more before the cold front passes. Other guidance is
quicker with the cold frontal passage, which would mean cooler
temperatures for Friday.
Chance POPs will continue through Saturday with cooling temperatures
aloft, and the potential for lake effect.
Starting at the end of the long term period, temperatures look to
cool below normal again as another arctic airmass drops south out of
Canada. Long range guidance suggesting 850H temps approaching -25C
in the first half of the week of Feb. 7th. This would be the coldest
airmass of the winter thus far if it comes to fruition.