Incoming 'parade of storms' bad news for flood-soaked B.C.
CBC
A "parade of storms" headed for southwest British Columbia could worsen flooding and mudslide conditions within the week, according to the meteorologist responsible for warning preparedness at Environment and Climate Change Canada.
Armel Castellan said the first storm system, expected to arrive Thursday, won't bring rains as heavy as those that triggered widespread destruction last week.
However, the precipitation will be significant enough to "exacerbate the vulnerabilities on the ground currently," he said.
"With the Thursday system, it is an atmospheric river, tapping into some subtropical moisture and heat. It's going to bring freezing levels [on mountains] up to 2,500 metres, so fairly high — there will be some snow melt with this moisture," he said.
Castellan predicts 40 to 70 millimetres falling in the flood-soaked Fraser Valley, and upwards of 100 millimetres on the North Shore mountains and Howe Sound.
After that system is tapped out, another atmospheric river is expected to follow in short order, hitting Saturday afternoon.
Castellan said with some areas already at 200 per cent the normal seasonal rainfall, the worry is the incoming rain will be falling on terrain that is already saturated. On hillsides, that means a greater likelihood of water running downhill and causing mudslides and valley flooding.
"I would just caution that we are dealing with very active weather for the foreseeable future," he said.
A series of warnings and special weather statements is also in effect for the northern half of the province, primarily for dangerously strong winds and snowfall.
And snowfall warnings have been issued for the Fraser Valley and Fraser Canyon, which have already been pummeled by relentless rain and impacted by highway closures.
An atmospheric river system that slammed the north coast over the weekend, bringing heavy rainfall, has also triggered a flood watch for Haida Gwaii, Prince Rupert, Kitimat, Hartley Bay, Kemano and surrounding areas.
A flood watch means river levels are rising and may exceed their banks and flood adjacent areas. A flood warning means that's already happened.
The atmospheric river hit the region Saturday. According to the Ministry of Forests, Lands, Natural Resource Operations and Rural Development, that area could see up to 300 millimetres of rain by Monday night, with the highest amounts hitting the outer coast between Prince Rupert and Ocean Falls.
Snowmelt at low-to-mid elevations is expected to add to runoff and the ministry is advising people to stay clear of fast-flowing rivers and potentially unstable riverbanks.
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