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Shoreline Flood Potential: Moderate

Issued to: local municipalities, local conservation authorities, emergency response agencies, media, NVCA board and staff

Date:        November 1, 2020 (4:30 PM)

The Nottawasaga Valley Conservation Authority advises that a Shoreline Conditions Statement – Nottawasaga Bay (Georgian Bay) Storm Surge is being issued for the Wasaga Beach and Collingwood shoreline areas of our watershed. Ongoing high lake level conditions combined with forecast high winds and waves late this evening and overnight may result in localized shoreline flooding, erosion and dangerous conditions in these areas.

Weather Conditions

Static water levels for Georgian Bay remain elevated compared to historic norms. Environment Canada has issued a Wind Warning for the area, indicating wind gusts up to 90 kilometres per hour can be expected this evening. Wave heights are forecast to exceed 2.0 metres beginning late this evening and gradually subsiding in the early morning tomorrow along the shoreline in our watershed.

Issues

High lake levels combined with the forecast strong northwest winds will increase wave heights along the Nottawasaga Bay (Georgian Bay) shoreline in our jurisdiction. There is the potential for shoreline flooding and erosion as a result.

Flooding and erosion of low-lying coastal areas may occur. Shoreline beaches, trails and properties may be impacted by shoreline flooding. It is possible that structures or roadways close to the shoreline may also be impacted by waves.

Actions

Municipal staff and landowners of flood-prone shoreline properties should be on alert.

All shoreline areas should be considered dangerous during this time. Localized flooding combined with the potential for waves to overtop breakwalls and other shoreline structures continue to make these locations extremely dangerous. The public and especially children are advised to exercise caution near shoreline areas.

This message pertains to Nottawasaga Bay (Georgian Bay) in the NVCA watershed only.

Additional information on current and forecast water levels in the Great Lakes is available online through the Fisheries and Oceans Canada website: https://waterlevels.gc.ca/C&A/bulletin-eng.htmlhttps://www.lre.usace.army.mil/Missions/Great-Lakes-Information/Great-Lakes-Information.aspx.

For additional information about Flood Forecasting and Warning Program, visit the Ontario Surface Water Monitoring Centre at https://www.ontario.ca/law-and-safety/flood-forecasting-and-warning-program.

The Nottawasaga Valley Conservation Authority continues to monitor shoreline water level conditions and will issue additional messages as conditions warrant. This Shoreline Conditions Statement – Nottawasaga Bay (Georgian Bay) Storm Surge will be in effect until 1:00 PM November 2, 2020.

For additional information, please call 705-424-1479 and select option “1” for the flood information line or check our website at:  www.nvca.on.ca

Peter Alm
Flood Duty Officer

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