A Winter Storm WATCH is in effect from 12 midnight tonight to 6 PM Wednesday for most of the NWS Wilmington, Ohio forecast area (excluding the far southeastern counties) and WILL BE UPGRADED later this afternoon...Winter Storm WARNINGS issued by Louisville, Indianapolis and Jackson, KY NWS offices as of 12:50 PM...
12:50 PM: CVG - 22 F (as of noon observation), Mostly Cloudy
Another significant winter storm...the second in the last 5 days...will impact the Ohio Valley tonight through Wednesday. A surface low down south will track from Louisiana up through Central Ohio by Tuesday afternoon. An upper low will track through the OV as well, moving across the Tri-State Tuesday afternoon and Tuesday night.
Models have been trending colder for the Cincinnati and Dayton areas and higher on snow amounts also. The 12Z guidance that just came in indicates a solid 6"+ of snowfall across the Cincinnati metro, and another 8"+ storm for Dayton. In fact at a 10 to 1 snow to liquid ratio the Global Forecast System model wants to put down 7" of snowfall at Cincinnati.
Consequently, here is what I expect total-wise:
North and Northwest of Cincinnati, including Dayton: 8-12", highest near and NORTH of Interstate 70
Cincinnati proper, including areas along and 30 mi N/S of line from Columbus, IN through Hillsboro, OH: 6-8". Could be minor mixing.
South and Southeast: 4-6", mixing is probably confined to areas far south and east.
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