Sunday, December 13, 2009
A low pressure passing well north of the region today will slide a frontal trough through the area. A shot of steady precipitation is accompanying the trough in the form of snow and rain with patchy freezing rain. The precipitation should taper off this evening with a total of about 2-4cm of snow and a few showers. There have been freezing rain warnings posted for southern Ontario as well as winter weather advisories for the Adirondacks and Green Mountains.
Once this system moves out another low will enter the region late Monday with yet another round of rain and snow. This will set us up for an Arctic front late Tuesday the will usher in the coldest air of the season and more lake snows for Ontario and New York. Speaking of lake snows, the radar shot above shows one of the plumes of snow off Lake Huron and Georgian Bay this past week. The wind was so strong aloft and the squalls so intense that they reached into southern Quebec, a distance of over 800km. I have never seen a squall off Lake Huron reach into this region before. The snow fell heavily all the way east to Lanark County where over 30cm fell in Franktown. Closer to the lake shore over 75cm of snow fell in the Grey and Bruce regions as well as the Muskokas. The same was true east of Lakes Ontario and Erie. Snow fell all the way east into Vermont. As much as 4 feet fell on the Tug Hill Plateau south of Watertown and in ski country south of Buffalo. More will fall later this week, but I don't expect them to be as intense.
The snow that fell on Ile Perrot last Thursday depositing a paltry 5cm originated all the way from Lake Huron. Hard to believe for certain.