Good Friday  afternoon. We are now operating under a WINTER STORM THREAT for Sunday into Sunday night. This is a dangerous setup as a blast of severe arctic air moves in behind the snow. Throw in 40mph wind gusts and you have an extreme event ready to unfold.

Let’s start with the snow potential with this system. An arctic front will be moving into western Kentucky early in the morning. A wave of low pressure will develop along this boundary as it surges eastward across the state. Temps ahead of this will spike toward the low 40s. That wont last long as the crash of all crashes ensues upon the arrival of the front.

A narrow band of rain is possible ahead of the front, but most of the precipitation falls behind it in the cold. The GFS has been showing this for a while and the NAM is firmly in the same camp…

NAM

That shows up well on the above maps. The latest run of the GFS is now putting quite a bit of snow down across the state…

GFS 2

The temperatures coming in behind the snow are just downright dangerous…

GFS

That’s just unreal and could be historic across the Ohio Valley.

My thoughts on how this plays out:

– Snow develops behind the front in western Kentucky by midday Sunday. Ahead of it… a line of showers will be possible with temps surging toward 40 or a little better.

– The arctic front slams eastward during the rest of the day and a wall of heavy snow follows it across the state. Widespread 1″-4″ totals look likely with amounts approaching 6″ possible for some areas. This will turn into a powdery snow that gets whipped around.

– Wind gusts of 40mph will accompany the wall of snow and this may create near blizzard conditions for a while.

– Temps go from above freezing to below 0 in a matter of hours.

– Wind chill readings on Monday may approach -30 or lower.

I will have updates as needed. Take care.