Wasn’t expecting much this day, but nature surprised us with a nicely structured supercell northeast of Cheyenne. This storm spun nicely with the marginal shear in place, and decent moisture and instability resulted in a hailer producing stones to baseball sized! We were quite surprised how big they were when we drove under the vault region of the supercell. We stopped traffic heading into it and warned of the huge hail. Most people responded by staying back till the storm passed. Nice surprise indeed!