Wednesday, February 06, 2013

Potential storm for Friday

Another weak clipper system is affecting southern Quebec this morning with a few flurries giving a dusting of snow. It will turn windy with clearing skies by mid-afternoon with temperatures leveling off around -8C. Tonight will be clear and cold with lows down to -21C in Montreal, colder in the burbs. Thursday will feature increasing and lowering clouds as the day progresses with very cold highs of -17C and an increasing northeast wind making it feel damp and chilly.

We then have a rather complex situation setting up with two low pressure areas expected to affect southern and eastern Ontario, Quebec, New England and eventually Atlantic Canada. Light snow will begin in southwest Ontario early Thursday and reach the Ottawa Valley and Quebec border by late in the day. The snow is being generated by the first system a clipper from out west that will produce about 5-10cm of snow for most locations. The snow will become enhanced Thursday night and especially Friday as the first low begins to interact with a developing coastal low near the Outer Banks of North Carolina. This system will become the main storm, rapidly deepen and move to Cape Cod by late Saturday. This will result in a significant snowfall for many portions of our region Friday. The exact amounts and where warnings may be required still needs some tweaking. Currently a Winter Storm Watch is posted for southern New England. We will see more watches and warnings as the forecast becomes a little more clear. I will post another update later today.

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