Speaking of that, this post from PSU in the MA is some good info as the flow really is backing. Seeing this WV loops really affirms that there is a big storm coming for someone (as long as it gets far enough north into the cold sector)
https://www.tropicaltidbits.com/sat/satlooper.php?region=us&product=wv-mid
The WV loop is a thing of beauty. The flow is really backing in the TN valley. This has a classic look for the mid Atlantic!
Btw I still like to look at the WV sometimes just to get a feel for the flow. I’ll never forget being in the psu weather center the day before the Jan 2000 storm trying to argue with the meteorologists on duty that it was clear from the WV and IR that the mid and upper levels were way more amplified and the flow was backing much more than any of the nwp was showing over the Miss Valley. They were pretty dismissive…”it’s only 24 hours, the models would be picking up on it” lol