Starting Monday, residents of Ayr and New Hamburg will face rising water, road closures and slippery banks near the Nith River that threaten buildings and sidewalks.
Monday, March 9 the Grand River Conservation Authority issued Zone 2 flood warnings after three days of rain and warmer temperatures that melted the snowpack, tied to an ice storm ontario threat.
GRCA and Ice Storm Ontario Warnings
The Grand River Conservation Authority has placed zones along the Nith River at elevated levels, with areas expected to reach Flood Warning Zone 2 by Sunday evening and possibly Zone 3 by Monday.
Warm weather and rain over the past three days melted the snowpack, and the GRCA noted air temperatures approaching 7 or 8 Celsius in the northern watershed and mid-teens the following two days, a pattern that will continue melting snow and raising water levels.
Rising water could reach the rear of buildings that front Northumberland Street in downtown Ayr and begin pouring onto sidewalks and streets across affected neighbourhoods.
Ayr and New Hamburg Impacts
Local authorities have already implemented multiple road closures across the impacted areas, creating travel disruptions for residents and emergency services.
Banks adjacent to rivers, ponds and creeks are very slippery and, combined with fast-moving water, present a serious hazard; the GRCA has advised parents to keep children and pets away from all watercourses and open water.
As of the latest messages, the GRCA stated there are no current concerns of flooding associated with the Grand River flowing through North Dumfries.
Waterloo Region Forecast
A larger storm system is expected to arrive late Tuesday and into Wednesday, bringing a mix of snow, freezing rain, ice pellets and heavy rain that could increase river levels and cause ice jams in low-lying areas.
Prolonged freezing rain and ice pellets could lead to multi-day power outages, slick untreated surfaces and broken tree branches, while flood watches and warnings have been issued for parts of southern Ontario, including communities along the Grand River such as Brantford and New Hamburg.
This broader pattern amplifies the ice storm ontario risks already stressing local waterways and raises the chance of continued flooding through the region.
If the significant storm system arrives late Tuesday and tracks as currently expected, flood risks could increase through Wednesday and into the following days, prompting continued monitoring and potential additional warnings.
