NL Storm Update

By: BwalshNLWeather , 7:01 PM GMT on December 15, 2013

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Good afternoon,

A low currently tracking across Nova Scotia is expected to pass over Eastern Newfoundland (first over the Connaigre Peninsula, then the Bonavista Peninsula) overnight, which will cause snow to mix with, and changeover to, rain for areas to the east of the lows track.

Snow has already developed over Southwestern Newfoundland this afternoon, and will spread across Central and Eastern Newfoundland early this evening (6-8 PM). Within 1-2 hours of the light snow beginning, it will intensify to moderate/heavy across much of the Island, except the Northern Peninsula. Snow will change to rain over Eastern Newfoundland overnight, with a brief period of ice pellets and freezing rain during the changeover. Rain tapers to drizzle by dawn Monday morning in Eastern Newfoundland, while snow tapers to flurries elsewhere on the Island.

Significant snowfall (20-30 cm) is expected for much of Newfoundland, except the Northern Peninsula. In addition, east-southeasterly winds of 60 gusting to 90 km/h are expected along the coastlines of Southern and Eastern Newfoundland late this evening (up to 120 km/h on extreme Southern Avalon), reducing visibility in blowing and drifting snow. Winds diminish overnight and shift to southwesterly.

Storm Timeline for St. John’s and the Metro region
Light snow begins between 6-7 PM this evening. Snow, at times heavy develops between 8 and 9 PM and continues through 2 AM Monday with snowfall rates of 3-5 cm/hour. Snow becomes mixed with ice pellets/freezing rain around 2 AM Monday, then mixing with, or changing to, light rain/drizzle around 3 AM Monday. Drizzle ends Monday morning, with a few sunny breaks possible, before flurries develop in the afternoon. Flurries continue Monday night with a further 2-5 cm expected. Temperatures rise to plus 6 Monday morning, falling back below zero in the afternoon.

Snowfall amounts of 20-25 cm are likely for Metro before mixing occurs early Monday.

Outlook:
After tonight’s storm, current guidance is indicating another potential storm for the Island on Wednesday. Currently, a track over Central Newfoundland is expected, which would mean another snow to rain event for Eastern Newfoundland.

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About BwalshNLWeather

Operations Manager and Meteorologist with Ice & Environmental Services at Provincial Aerospace Ltd. I've been weather forecasting since 2000.

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