If you can get an inch of QPF as ice, that will cause some pretty serious damage. It won’t be 2008, but you can accrete 4 tenths or even half an inch of radial ice. Typically 3/8ths when you really start ramping up the power outages.
I agree half an inch of QPF as ice wouldn’t get it done. That would be under a quarter inch radial and probably keep power issues to a minimum. It’s def better to lean in the conservative direction when QPF isn’t super robust.