What would happen if I decided no to ground it and take the antenna off the base and disconnect the radio every time severe weather occurs?(which isn't often)
If you disconnected the coax cable and pulled it back outside the home, maybe nothing. But what happens if you are asleep, or not home? Remember, it isn't just your scanner that will get destroyed.
Removing the antenna from the base will not protect you in any way.
Lightning travels thousands of feet through a really good insulator (air). Removing the antenna whip will do nothing for you if the strike decides to pick your cable, or even anything nearby. It's not just the direct strike you need to be concerned about. Even a nearby strike can induce enough energy into the coax to cause damage/fire. Even underground.
As for the cable disconnected from the radio...
It might protect your radio from static buildup, but remember, a few thousand feet of air was just overcome. A few inches of separation isn't going to do anything. That energy is still looking for a way to get to ground. It's going to take any/all paths it feels like.
It's your radio, your home, your decision. It's entirely your choice. But the National Electric Code wasn't something that a bunch of guys sitting around one day randomly came up with. All the stuff in there is well thought out, and a fair amount of it in response to fires, injuries and deaths.