Market Orders ( or orders executed at current trading Price) have  momentum in price written all over them. 

a bunch of them together can create the fast moves you see

We call them initiative trades - Initiative sellers (IS)  or Initiative Buyers ( IB) 

When they appear on your charts, the market is about to move very quickly 

Best time frame to track them is 30 mins, but you can see them in 1 and 3 and 5 min bars also in your Orderflow charts