Yellow Warning - Severe Thunderstorm

At 4:01 p.m. EDT, Environment Canada meteorologists are tracking a dangerous thunderstorm capable of producing extremely heavy rain.

Thunderstorm Location: Grassie to St. Catharines

Motion: Moving very slowly

Hazards: Personal weather station data and radar indicates 50 to 110 mm of rain has fallen. Additional rainfall amounts up to 15 mm are possible.

Locations in the Path: Beamsville Vineland St. Catharines Thorold Niagara Falls

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Heavy rain may cause flash flooding and significant reductions to visibility.