A strong winter storm swept across Ontario, causing whiteout conditions that worsened overnight into Thursday, February 13, prompting school and road closures, local media reported.Weather alerts were issued as locals were warned that the severe cold would extend to areas west of Lake Ontario, with snow and possible freezing rain.The severe weather prompted road closures, school closures, and flight cancellations.Provincial police confirmed several collisions overnight, with vehicles also stranded in snowdrifts.Local journalist Ryan Rocca said he was in Mississauga, where he saw “very heavy snow” on Wednesday night. Credit: Ryan Rocca/INsauga via Storyful