ISSUED: January 17, 2017 12:00 PM
The River Forecast Centre is issuing a High Streamflow Advisory for the South Coast including:
- Howe Sound including the Stawamus River and surrounding creeks and tributaries
- Sunshine Coast including streams around Gibsons, Sechelt and surrounding areas
- North Shore Mountains including the Seymour River and surrounding creeks and tributaries
A strong winter storm is expected to impact the south coast of British Columbia today and into Thursday. A rainfall warning is in effect from Environment Canada, with 50-60 mm of precipitation forecasted through Thursday. Higher rainfall amounts are possible over higher terrain. Temperatures are expected to be moderate through this period, with freezing levels forecasted to be around the 1800 m level on Wednesday, and lowering to 900 m overnight. Snowmelt from mid-elevation terrain may add to runoff in the early part of this event. In watersheds with higher terrain, including the Squamish River and Lillooet River, snow may be the dominant form of precipitation, and river responses are expected to be lower than more coastal areas.
River levels are expected to rise rapidly in response to heavy rain. High streamflow is expected on rivers throughout the region, with the highest flows expected Wednesday and into Thursday.
The River Forecast Centre will continue to monitor conditions and will update the advisory as conditions warrant.
Levels of Warnings/Advisories:
High Streamflow Advisory: River levels are rising or expected to rise rapidly, but no major flooding is expected. Minor flooding in low-lying areas is possible. This is the lowest level of advisory.
Flood Watch: River levels are rising and will approach or may exceed bankfull. Flooding of areas adjacent to affected rivers may occur. This is the intermediate level of advisory.
Flood Warning: River levels have exceeded bankfull or will exceed bankfull imminently, and that flooding of areas adjacent to the rivers affected will result. This is the highest level of advisory..