Started the day with a Slight Risk to go for over Montana, Wyoming and South Dakota. Left Rapid City and had lunch in Spearfish, conditions were very favourable with 3,000jkg of Cape and temps and dewpoints very respectable. The Cap was very strong though and it took until 6pm for any notable storm to go Severe, we watched this for about an hour getting attacked by huge Mosquitos at the same time, end the day at Belle Fourche (South Dakota) and was treated to a couple of Elevated Storms which initiated over the Black Hills region. The Mammatus on the Storms were very pronounced and some of the best I have seen at dusk! The next day we have a solid risk in North Dakota to go for.