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WINTER STORM WATCH NOW ISSUED FOR SOUTHERN OHIO FOR FRIDAY. DETAILS AT THE BOTTOM OF THIS POST.
I'm still not convinced that this first push of colder air this weekend will be as strong as advertised. The mean trough stays west of Ohio on Friday and into the weekend. The 500mB flow is out of the southwest so the advection of cold air is more south than east. The core of the cold air doesn't slide east until early next week as the trough migrates into the Great Lakes.
Temps will start to fall Thursday but as I said earlier, the winds will parallel the front. So the front stalls and a low develops along it over the panhandle of Texas. It moves along the sharp temperature gradient along the Ohio River.