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The North Shuswap Kicker
May 2022
Spring Flood Risk (Freshet) By Jo Anne Malpass Flooding is a provincial risk every spring due to a combination of snowmelt and/or rainfall (also known as freshet). Every region is at risk for flooding, even if the snowpack is below normal, says the BC River Forecast Centre. Spring weather conditions play a critical role in the rate at which the snow melts. For example, a gradual warming under dry conditions is ideal to lessen the flood risk. A lengthy cold period with high amounts of precipitation followed by a sudden extreme heat wave could lead to catastrophic conditions, especially if additional rain follows. Typically, regions with above normal snowpack have a higher risk for flooding. As of April 15, the provincial average increased to 107% of normal. Most regions have remained level or measured modest increases of +1 to +3 percentage points. The April 18 storm provided additional snowpack with many regions bumping up further. By April 15, on average, approximately 100% of the total seasonal snowpack accumulates. “Based on current weather patterns, this year is likely to continue adding mountain snowpack beyond April 15 as opposed to 2021 which began melting in mid-April from a heat wave event.” The April 1 Snow Survey and Water Supply Bulletin showed the North Thompson measured 119% of normal, which is the highest index since 1999. “Additionally, Shuswap Lake levels have been above average this (continued on page 13)
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