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1 day agoSpecial weather statement issued for wet long weekend in Toronto: Environment Canada | CBC News
Toronto will experience heavy rain and possible thunderstorms this weekend due to a Colorado low system.
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"This is going to help fill that gap in minutes to hours lead time that's vital to know where the heaviest rain is going to hit," Ralph said. "And when and what communities are going to be affected so people in the preparedness community and water resource management community can take action to help protect people's lives and property."
The storm from Sunday into Monday has the potential to become a bomb cyclone, which occurs when central pressure drops at least 0.71 inches of mercury (24 millibars) in 24 hours or less. That rapid strengthening would generate an expansive and intense wind field.
Confidence is highest from Sunday afternoon through Monday evening, when the individual models line up best on timing and on a colder snow-level drop. They converge on snow reaching all elevations across Alberta and staying below base at Kicking Horse and Big White.
Met Éireann is progressing in the area of more localised weather warnings, via the use of polygons to represent areas under warnings. This will mean a move away from county-based warnings to a sub-county-based warning approach, which will identify where the expected impacts will be in the county.
The Met Office has put two amber and seven yellow alerts in place for Thursday, with chief forecaster Neil Armstrong describing the system as a multi-hazard event combining heavy rain, powerful winds and snowfall. Storm Goretti, which was named by the French meteorological service, has also been labelled a weather bomb by the Met Office as it strengthens quickly over the Atlantic before tracking towards the UK and France.
When I spoke with emergency management officials last year, they all mentioned the same frustrating scenario. People ignore storm warnings until the precipitation starts falling, then suddenly everyone rushes out at once. The roads become congested with anxious drivers, accidents spike, and stores run out of essentials just when people need them most. But here's what really gets meteorologists worked up about this pattern. Modern weather forecasting has become incredibly accurate, especially for major winter storms.
The pattern change began Monday when the barometric pressure surrounding the region started to fall gradually. That increase in low pressure is coming from the southwest and the air is flowing north, opposite of many winter low-pressure systems that dip in from the Pacific Northwest. As a result, light but steady rain is expected to start in Monterey County and the Central Coast late Tuesday morning. The rain is expected to reach the region closer to San Francisco sometime Tuesday night, Murdock said.