Ottawa is getting the biggest snowstorm of the season today, with 35 centimetres of snow expected to fall. When are we expected to see the worst, and what makes these forecasts so challenging to predict? Doug Gillham, a meteorologist with The Weather Network, breaks it all down for us in Hour 1. Then, we get a boots-on-the-ground update from CTV’s Jackie Perez. But first, we bring you up to speed on today’s top headlines.

<p>Ottawa is getting the biggest snowstorm of the season today, with 35 centimetres of snow expected to fall. When are we expected to see the worst, and what makes these forecasts so challenging to predict? Doug Gillham, a meteorologist with The Weather Network, breaks it all down for us in Hour 1. Then, we get a boots-on-the-ground update from CTV&rsquo;s Jackie Perez. But first, we bring you up to speed on today&rsquo;s top headlines.</p>