Jun 20, 2010
Meteorologically speaking, this was a very active severe weather day for south central Montana. A very moist and unstable atmosphere was in place across portions of the Billings Forecast area during the afternoon and evening of the 20th (Father's Day). A moist, southeast surface flow, strong wind shear aloft, and ample afternoon heating provided the necessary ingredients for severe weather. Numerous thunderstorms, some of which became rapidly severe producing tornadoes and large hail, developed
Source: NOAA National Weather Service Storm Events Database (event 239261). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Yellowstone County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.