Heavy rainfall warning for much of southern Ontario

Environment Canada issued a heavy rainfall warning Sunday, with predictions of between 25 and 50 mm of rain in some areas beginning around midnight Sunday and stretching into the early morning hours of Monday.

25-50 mm of rain predicted as storms move in from west, south

The Nith River is seen bursting its banks in New Hamburg in 2013. The Grand River Conservation Authority is warning mild temperatures and rain this week will increase the water levels in the river. (Mike McCulloch/CBC News)

The astonishing range of weather, from ice storm to sunburn and t-shirt strolls over the Easter weekend, will have one more feature for Waterloo Region Sunday night.

Environment Canada issued a heavy rainfall warning Sunday, with predictions of between 25 and 50 mm of rain in some areas beginning around midnight Sunday and stretching into the early morning hours of Monday.

Areas under the  Environment Canada warning include: 

The national weather agency predicts rain with periods of heavy rain beginning late Sunday and continuing until as late as mid-day Monday in some areas.
Environment Canada issued a heavy rainfall warning Sunday, March 27, 2016 for much of Southern Ontario. (Environment Canada)

"Total rainfall amounts of 25 to 50 mm are expected," the warning said.

"There is also a risk of an isolated thunderstorm this evening or overnight over Southwestern Ontario," it added in the warning.

"Heavy downpours can cause flash floods and water pooling on roads. If visibility is reduced while driving, turn on your lights and maintain a safe following distance," Environment Canada advised.

GRCA flood watch

As a result of the combination of a warm snow melt on Sunday and the predicted heavy downpour Monday, the Grand River Conservation Authority issued a flood watch Sunday.

The GRCA warned that the most likely places for flooding were the "traditional" flood-prone areas of Elora, New Hamburg, Ayr, Grand Valley and Drayton.

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