Notice of High Streamflow Advisory

Sep 23, 2020

The BC River Forecast Centre has issued a High Streamflow Advisory which includes Howe Sound, Sea to Sky and the Lillooet River. 

A series of storms is expected to impact the British Columbia coast over the next several days. The first system begins today and will continue into Thursday, with following systems passing again later Friday and into the weekend.

Environment and Climate Change Canada has issued a Special Weather Statement for the region, with forecasted rainfall totals for the first storm at 30-50mm for the South Coast with higher amounts in the mountains.

These storms will mark a significant shift in streamflow runoff conditions which have been dominated by drier summer patterns for the past several weeks. Rivers are expected to rise rapidly in response to rainfall on Wednesday, with peak flows from the first storm expected late-Wednesday or Thursday, with larger rivers expected to reach peak levels later on Thursday or into Friday.

Current hydrologic modelling is indicating the potential for streamflow in the 2-year to 5-year flows in some areas which can lead to localized issues and minor flooding.

Additional storm cycles into the weekend will bring additional periods of high streamflow. 

Flood Warning and Advisory Map: BC River Forecast Centre

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