A huge storm hit Estevan, Saskatchewan on Thursday, June 14, amid a tornado warning.This video of black clouds filling the sky over the city was captured by eyewitness Lee Mantei.The storm, which brought high winds, heavy rain and hail, caused a power outage for a widespread area in the city, local radio station 620 CKRM reported.A tornado and thunderstorm warning was issued by Environment Canada. Credit: Lee Mantei via Storyful