People have been wanting to do that forever.
I remember my old boss in IT, 23 years ago, wasnt even a trader but he knew if you could predict when those days would happen you would make a lot of money.
I think the key is not to predict but to feel for it while it actually happens. It doesn’t have to be from the beginning of the trading day, often times you realize it in the middle of the day, like a light bulb going off in your brain.
Better yet, these kind of 10% big trend days happen in regularity, say once a week.

