Risk of flurries, mercury plunging to -12 C overnight

A temperature teeter-totter is in the forecast with the mercury swinging from as low as -12 C to as high as 9 C over the next few days.
Ottawa awoke to 0 C Wednesday morning but the mercury will drop to -2 C by the afternoon, with a 30 per cent chance of flurries, and a frosty -12 C overnight.
For Thursday, Environment Canada predicts clouds and a high of 3 C. There’s a 40 per cent chance of flurries overnight and a low of -2 C.
Friday’s forecast is for a mix of sun and cloud, a high