June 7th took us to North Dakota to chase a dryline/outflow boundary. Several storms formed and started spinning. Eventually they congealed into a large bowing MCS with hurricane force winds and cool shelf cloud structure. We encountered down power lines, trees and demolished structures. Even our hotel in Dickinson was without power forcing us to move to a part of town that actually had power. A crazy day, and the winds we encountered with the shelf cloud structure was quite cool. Many reports of winds over 90 mph!