Weather: Frigid temps snap back with -40 windchill

You know the drill by now.
Ottawa awoke to -24 C Friday morning and the news that Environment Canada had issued yet another extreme cold warning with windchills expected to hover around -40 Friday and Saturday.
So cover up, check up on vulnerable friends and neighbours and bring pets inside.
Planning to hit the Rideau Canal Skateway on opening day? Cover every scrap of exposed skin because Ottawa Public Health has a frostbite warning in effect, too.
Friday’s forecast is for periods of