Mild and pleasant weather correlated with upper ridging in place for the west will face some disruption during the course of this week as another closed low pivots across the region and steadily diminishes heading eastward.
This disturbance should impact BC through Tuesday before intensifying as it pushes into AB and SK during the Wednesday-Thursday timeframe. The strength of the low and the potential associated precip could be memorable based on the latest available info.
This is the interpretation of events from the 12z GFS @ hour 72 / 96 / 120:
This seems as if it will only be a temporary break in the overall pattern as another ridge builds in from the Eastern Pacific once the storm has passed.
The expected storm along the east coast has come to fruition as spring surrenders to renewed winter weather for NL & Labrador.
Satellite view of the system:
This unwelcome guest has dropped substantial amounts of snow in some areas, along with rain and wind.
The latest summary from EC is available now.
NEWFOUNDLAND AND LABRADOR
Weather summary for Newfoundland issued by Environment Canada at 4:41 p.m. NDT Sunday 21 May 2017. Discussion. Wintry holiday weekend. An intensifying low pressure system tracked slowly eastward across Newfoundland this weekend, and is now weakening as it departs out to sea. Showers and thundershowers arrived ahead of the low on Friday. Rain and patchy freezing rain, as well as snow and strong winds, followed in its wake for the weekend. The following is a summary of weather event information received by Environment and Climate Change Canada between 9:30 P.M. Thursday and 4:30 P.M. today. 1. Precipitation amounts (from rain, freezing rain and melted snow) in millimetres: La Scie: 122.5 Englee: 80.0 Rocky Harbour: 58.4 Lewisporte: 48.7 (as of 8:00 A.M. Sunday) Ferolle Point: 48.6 St. Anthony Airport: 47.3 Kippens: 44.1 Sandy Lake: 40.1 (as of 1:00 P.M. Sunday) Springdale: 37.6 Badger: 36.9 Daniel's Harbour 36.0 Gander Int'l Airport: 36.0 Twillingate: 30.6 Cormack: 27.6 Grand Falls-Windsor: 26.8 Terra Nova 22.6 Stephenville Airport: 22.2 Wreckhouse: 22.2 Corner Brook: 21.9 2. Summary of snowfall: Much of the precipitation over western and northern Newfoundland fell as wet snow. While the water content was very high, a large amount of the snow melted without accumulating on the ground. Due to the uncertain rates of melting, it is not possible to estimate snowfall accumulations at our unmanned reporting stations. Ruler measurements in centimetres: Cow Head: 10.0 (as of 4:00 P.M. Saturday) St. Anthony (town): 7.7 Kippens: 5.6 St. John's Int'l Airport: 5.0 Mount Pearl: 4.5 Stephenville Airport: 3.0 Numerous unofficial reports indicate that accumulations of 10 to 20 cm were common across much of the Great Northern Peninsula, Baie Verte Peninsula and Gros Morne National Park. A swath of amounts in excess of 30 cm was evident on the eastern side of the Northern Peninsula (south of Hare Bay). Analysis of moisture and temperature profiles suggests that even greater totals likely accumulated over the mountains. 3. Summary of peak wind gusts in kilometres per hour: Green Island (Fortune Bay): 113 Sagona Island: 104 Twillingate: 100 Ramea: 94 Port aux Basques: 93 Saint-Pierre: 93 Cape Race: 92 St. Anthony Airport: 91 Stephenville Airport: 91 Wreckhouse: 91 Cape Pine: 90 Ferrolle Point: 90 St. Lawrence: 90 Please note that this summary may contain preliminary or unofficial information and does not constitute a complete or final report. End/NLWO
Weather summary for Labrador issued by Environment Canada at 3:39 p.m. ADT Sunday 21 May 2017. Discussion. Wintry holiday weekend. A slow-moving low pressure system intensified as it tracked eastward across Newfoundland this weekend. This storm brought rain, snow and strong winds to southeastern Labrador. The following is a summary of weather event information received by Environment and Climate Change Canada as of 3:30 P.M. NDT today. 1. Summary of precipitation amounts (from rain and melted snow) in millimetres: Cartwright: 58.0 Mary's Harbour: 42.7 Blanc-Sablon: 24.8 L'Anse au Loup: 23.0 2. Summary of snowfall in centimetres: Cartwright: 51.6 Blanc-Sablon: 7.6 L'Anse au Loup: 4.0 3. Summary of peak wind gusts in kilometres per hour: Blanc-Sablon: 102 L'Anse au Loup: 98 Cartwright: 85 Mary's Harbour: 85 Please note that this summary may contain preliminary or unofficial information and does not constitute a complete or final report. End/NLWO