OK it's late and late info doesn't give me any reason to make any significant changes. Tomorrow's storm is now developing in Lousiana. It will be a fast mover that is expected to be "in by 4 out by 5."  Here is a timeline I worked up.  Most of the D.C. area getting the dreaded "wintry mix" with all snow will be well west and north. Have a look. 

Enjoy a touch of winter on a Saturday.