An unsettled pattern continued across a large part of the US, with widespread isolated tornadoes across various parts of the Plains states. The most notable tornado touched down in Billings, Montana at the MetraPark trade facility. Damage was significant, including a large section of the roof being removed at the
Rimrock Auto Arena at MetraPark. The
Storm Prediction Center in
Norman, Oklahoma had issued a
severe thunderstorm watch for south-central Montana, including
Yellowstone County, at 1:55 pm
CDT on June 20, in anticipation of active severe weather throughout the region. Strong southwesterly flow aloft combined with a moderately unstable air mass created conditions favorable for producing severe thunderstorms, and potentially tornadoes. A supercell thunderstorm moved through the Billings area in the late afternoon. At approximately 4:24 pm
MDT, a tornado touched down near the intersection of Lake Elmo drive and Main Street. It damaged several buildings, including tearing roofs off of multiple structures. It also downed several power poles and billboards, and uprooted multiple trees. The tornado moved south, where it struck the Rimrock Auto Arena at MetraPark, tearing off a large portion of the roof and doing nearly $27 million worth of damage to the arena. The tornado lofted debris and deposited it as far as one mile from the damage path. After approximately 12 minutes on the ground, the tornado dissipated over the arena. The storm then moved northeast, producing numerous funnel clouds, but no further touchdowns. ==Aftermath==