The height of it where you are could be close to 10:1 if we can get that filthy lift in the DGZ. The higher elevations may be even better if they can get to like 31.5F or something. Otherwise yeah that sounds about right.
There is a ton of warmth and moisture feeding into this. So yeah as that 850-700 sort of goes under us and tries to curl in, you get the WF feature and lift up and over it.
This could be mostly done in 6 hrs. After the thump, probably light mix of RASN. Has that look. It might last longer to the north with erly flow lasts longer.