The St. Clair Region Conservation Authority issued a watershed conditions statement on Sunday, October 24, 2021.
“Environment Canada has issued a Special Weather Statement as a low pressure system tracking across Southern Ontario is forecast to bring 45 mm to 65 mm of rain across the watershed between tonight through overnight Monday,” SCRCA officials say.
“High amounts of rainfall in a short period of time can lead to increased runoff and flash flooding, particularly in urban areas. Residents may experience ponding and/or flooding on roads should the rainfall intensity be greater than local storm drain capacity.”
Rainfall events over the past month have left soils saturated and water levels elevated across the watershed, making the watershed more susceptible to runoff and water levels responding more quickly to precipitation, SCRCA officials added.
“Flooding into natural floodplain areas, parks and farmland is possible,” SCRCA officials added.
“Strong winds are anticipated with this system, beginning southwest and becoming northeast this evening and into Monday. Forecast models predict waves up to a metre in height on Lake Huron near Sarnia, and half to one metre near Mitchell’s Bay, Lake St. Clair. Residents along these shorelines should anticipate storm surge as the winds will impact water levels on the lakes.”
Individuals are reminded to avoid shorelines, watercourses and flooded areas due to dangerous conditions, slippery banks and cold, swift moving water.
Children and pets should be kept away from the water, SCRCA officials added.
The Conservation Authority continues to monitor watershed conditions and will issue advisories to municipalities and media should flood issues arise.
Municipal emergency response staff and road superintendents should monitor local conditions closely.
This message will remain in effect until Tuesday, October 26, 2021, unless otherwise updated.
