UPDATE 4PM: Warm air advection is causing an area of light snow to break out well ahead of the main band of snow from Montreal to Cornwall. Travel remains good in that area but is deteriorating west of Kingston towards Toronto. Look for snow tonight, between 5-15cm in most areas changing to rain with freezing rain in eastern Ontario by mid-day Wednesday. Winter Storm Warnings and Winter Weather Advisories remain posted through Christmas Eve.
UPDATE 11:00AM: Winter Storm Watch issued for Kemptville and Eastern Ontario for 10-15cm of snow tonight and then freezing rain into Wednesday afternoon
Merry Christmas everyone... I wish I had better news in the weather department, but one word comes to mind, messy. After a dry and cold day yesterday we are looking at increasing clouds this morning, with the leading edge of the next system already into southwestern Ontario. Environment Canada has posted winter storm watches for parts of the province along the 401 with winter weather advisories in effect in New York and Vermont. Nothing has been posted yet for eastern Ontario or Quebec. Travel will become poor later tonight.
Look for light snow to reach Kemptville by this evening and continue overnight before mixing with and changing to sleet and freezing rain, and eventually rain. The temperature will continue to rise from our low this morning of -26C towards plus 6C or so by late in the day Wednesday. Then it will drop again for Christmas Day with any precipitation changing back to flurries. It will also be breezy with this system especially along the Seaway. Most areas will see 5-10cm of snow before the change to mixed precipitation.
At this time Christmas Day looks mild at 0C with just a few flurries. Sadly all that wonderful powder we have will be soaked with rain and then freeze up. Be careful sledding or skiing.
Beyond Christmas Day, Boxing Day looks dry and chilly before another system is forecast to bring more mild air and rain by the weekend.
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