Winter Storm Watch

Environment Canada has posted a Winter Storm Watch for most of eastern Ontario and the Ottawa Valley for Tuesday. Low pressure over the Midwest will lift a warm front across Ontario and southwest Quebec during the day Tuesday. Precipitation in the form of light snow will begin in the morning, but rapidly change to freezing rain. The freezing rain could last up to six hours in Ottawa and Montreal. Cold air is dense and very stubborn to move out of the valley locations. Often in these scenarios quite a bit of ice accretion can form. It does not take a lot of ice to create treacherous driving. At present we are looking at 3-5mm of freezing rain before the change to rain as temperatures warm above freezing for Wednesday. If you have to travel on Tuesday make sure to check for the latest forecast. I will post an update on this weather event around 5pm today.