Sunday, June 5, 2022, 12:24 pm – Stay tuned for floods on Sunday BC, as constant rain and rapid snowmelt cause water levels to rise rapidly.
The flood threat has kept several communities in British Columbia on high alert, with rain continuing until Sunday. Flood observations and high flow warnings remain valid. In addition, there is a general risk of thunderstorms on Sunday for parts of the southern coast and the northern part of BC with upper headwaters over the province. In some areas there may still be 20-40 mm of rain before it decreases by Tuesday. Less than a week in a month could be the wettest June for British Columbia in a decade. More on what to expect on Sunday and below.
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SUNDAY / MONDAY: HIGH SECURITY FOR FLOOD RISK IN CONTINUATION OF RAIN
The current widespread threat of flooding in British Columbia includes several factors, including a long period of heavy rain, deeper than average snow in June, and higher temperatures that will constantly melt this excess snow.
A low-pressure system that has moved to British Columbia from the south is allowing a stream of atmospheric moisture to flood the province.
The heaviest rain lasts early on Sunday morning, especially for the lower part of the continent, after which it becomes more isolated until Sunday afternoon.
Widespread instability will flow through British Columbia with upper troughs in place, leading to a large-scale risk of thunderstorms on Sunday that will stretch from the lower continent to deep in the northern part of BC. Scattered thunderstorms are possible, with the strongest storms potentially causing light hail and localized floods from heavy rainfall.
Overall, 20-40 mm of rain remains for the Vancouver Metro area, which will end on Monday. An additional 20-40 mm is also expected for West Vancouver Island and the North Coast.
However, the biggest concern about the floods is further in to Okanagan, where flood hours are currently in place for areas including the communities of Kelowna, Penticton, Vernon and surrounding areas. For some, there are also recommendations for high flow.
The combination of rain, higher temperatures and rapid melting of snow will quickly push local waterways off their shores.
Scattered rainfall will persist on Monday, eventually decreasing until Tuesday.
POTENTIALLY THE MOST WETTING JUNE IN A DECADE
Some parallels are beginning to develop in British Columbia, especially in 2012. This year has been marked by a weakening of La Niña, but this year’s moderate La Niña steers the province towards the wettest June of the decade. In June 2012, more than 60 mm of rain fell in Nanaimo, 44 mm in Victoria and 77 mm in Vancouver and the Comox Valley.
Only in the first four days of June we set off for a wet start on the South Coast. It is possible that several stations will exceed 100 mm of precipitation this month, which makes this June the wettest since 2012.
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