I do...
15% chance of something happening means that there is an 85% chance of it NOT happening.
It’s not simply a matter of will or will not happening.
That’s one of the biggest misconceptions in meterology and it’s never explained well by meteorologists.
Whenever the SPC issues these percentages, they are not saying there will be a 15% percent change of a tornado happening and an 85% chance of it not happening.
They are saying within that 15%, there will be chances of severe long-lived tornadoes that could reach EF-3 or EF-4 status. There will be numerous tornado warnings issued within that area could pose a significant threat to property and lives.
Here is additional explanation if you’re curious.
Ohio was recently in a 2-5% tornado threat and ended getting slammed with several in which one was a EF-3.
So, while the SPC does their best to mark the mostly likely areas, it still doesn’t mean that people in the lower percentages are safe from the threat.
However, forecast changes in real-time because in the end Mother Nature will do as she pleases. But I would NEVER take 15% probability lightly. That’s attached to tornado outbreaks. Like, 5-10 tornadoes within the hashed zone.