Manitoba Daily

Monday, November 29, 2021

Storm reaching Atlantic Canada is very similar’ to the one that hit British Columbia

Key takeaways:

  • As like B.C. the same atmospheric conditions are creating a storm in Atlantic Canada.
  • During the initial B.C. storm, Hope, B.C., received more than 250 millimetres of rain between November 13 and 15.

Last week, a terrible storm raced across B.C., causing massive flooding and evacuations; now, the same type of atmospheric circumstances are causing a storm in Atlantic Canada.

In a phone conversation with CTVNews.ca, Bob Robichaud, a senior Environment Canada meteorologist located in Nova Scotia, said, “It’s a very comparable storm.”

“It’s the same kind of atmospheric arrangement that causes this kind of downpour.”

According to him, this type of significant rainfall event, such as the one in B.C., occurs when an “extremely concentrated plume of moisture in the sky that streams up from the tropics” becomes part of a storm.

“If there’s a storm and this stream of moisture comes up from the south, it’ll be very, very similar to what they had last week on the West Coast.” Some parts of Atlantic Canada may have even more precipitation than B.C. did last week.”

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During the initial B.C. storm, Hope, B.C., received more than 250 millimetres of rain between November 13 and 15.

Environment Canada’s forecasts anticipate that more than 300 mm of rain might fall in some areas, with some sections of Newfoundland receiving more than 400 mm.

“That would be a lot greater than what hit British Columbia,” Robichaud added. “Now, it’s just projected to fall over a tiny, sparsely inhabited area, but any time you get that much rain anywhere, it’s going to be a problem.”

When massive amounts of rainfall on steep terrain, it rushes off into valleys, causing flooding and other problems.

“As of just about 20 minutes ago, we’re reaching 200 here in Nova Scotia, in eastern Nova Scotia,” Robichaud added.

Although the areas at risk in Atlantic Canada are less inhibited than those in British Columbia, people are at risk when rapidly moving water gathers.

“This afternoon, we had several water rescues that needed to be done in sections of Nova Scotia where the water rose so quickly in a trailer park that the fire department had to go out in boats and save people,” Robichaud said.

Atlantic Canada storm similar to what hit B.C.

The rain in Nova Scotia will last through the night, he said, and will “impact Newfoundland all day tomorrow.”

“It won’t be until Thursday before things start to improve marginally across all of the impacted areas,” he said.

Weather varies greatly during the shift from summer to fall to winter, according to Robichaud.

“Certainly, that’s what we’re witnessing here with two large rainfall events on different ends of the coast within a week.”

While no single weather event has been linked to climate change, it has been found to intensify extreme weather events, which may help explain why Canada has been hit with so much rain recently.

According to Robichaud, researchers are attempting to determine how strong the link between these events and climate change is, who said that a warmer atmosphere could hold more water and hence has the potential for more severe rains.

“It’s consistent with climate change that we’ll see more of these, particularly larger rainfall events,” he added.

The battle for B.C. is far from over: additional rain is anticipated for the province, which is currently rebuilding after massive rains washed down highways and swamped cities. 

A weak system is headed their way, but a “more significant” cyclone could hit the area again a few days later.

“As we go towards the latter half of November and early December, they’re getting some additional storms,” Robichaud said.

Source: CTV News

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