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    Brett Anderson

    Late Thursday Snowstorm and Other Thoughts

    1/08/2013, 10:29:51 AM

    Remember, you can also follow my weather forecast commentary for Canada and the U.S. on my twitter @BrettAWX

    Southern Newfoundland snowstorm later Thursday into early Friday

    Clipper system now over Manitoba will race eastward and re-form over Nova Scotia early Thursday. The storm will rapidly intensify the rest of Thursday as it tracks just south of Newfoundland. The current expected track will likely deliver heavy snow, strong winds and possible blizzard conditions to parts of southern Newfoundland Thursday afternoon through early Friday.


    There is the potential for 30 cm of snow in the St. John's, NL, area with this storm. We will post a snow accumulation forecast map tomorrow (Wednesday).

    A slight northward deviation in the track could bring the rain/mix/snow line into the St. John's area, thus reducing the snow accumulation, but right now I think it only gets up into the southern part of the Avalon Peninsula.

    As the storm winds down Friday afternoon, the cold air that was in place ahead of the storm will be routed out of the region, so that any leftover precipitation Friday evening and night may end up in the liquid form for all of southeastern Newfoundland.

    --------- Other random thoughts..........

    1. Quick-moving feature dropping southeastward from the Gulf of Alaska could bring a period of accumulating snow to Vancouver Island and the southwest mainland of BC, including Vancouver on Saturday. Not a big storm by any means, but there should be enough cold in place for a small accumulation of snow for some areas.

    2. Several centimeters of snow is possible Friday night over extreme southeastern Manitoba and into northwestern Ontario as a wave of low pressure tracks northeastward and meets up with the approaching cold air.

    3. Potential for a period of freezing rain from the Peterborough to Ottawa and Montreal region Friday and Friday evening as mild air aloft overruns a shallow dome of cold air near the surface.

    4. Looks like Saturday is the peak of the warmth for Ontario.

    5. A series of weak waves of low pressure coming up along the front could bring periods of mixed precipitation or snow to parts of Ontario and Quebec Sunday night into Monday.

    6. True, Arctic air gets into the eastern Prairies early next week then just a matter of timing when it blasts into the Midwest, Northeast, eastern and Atlantic Canada (middle or late next week)

    7. New ECMWF model looking downright frigid (coldest air in quite a while) from Ontario into New England and Atlantic Canada the second half of next week. GFS also very cold, but with timing differences. Too early to know how much lake-effect snow there will be downwind of the Great Lakes when the Arctic air comes in, but the potential is certainly there. Also, as the cold comes in, we could see storm formation just south of the Maritimes and potential snow into Atlantic Canada.

    8. Dry pattern shaping up for southern BC and Pacific Northwest next week as an upper-level high pressure ridge amplifies along the West coast.

    9. New ECMWF monthlies have a cold look from the Prairies through eastern Canada and the Northeast U.S. for February thanks to a negative Arctic Oscillation.

    The views expressed are those of the author and not necessarily those of AccuWeather, Inc. or AccuWeather.com


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