Brockville – Mild and rainy conditions are expected over much of southern Ontario today, tonight and into Friday. Potential for accumulating snow Friday night into Saturday.
Rain is expected to be patchy and light for much of today, but may become more widespread tonight and into Friday. A general rainfall of 10 to 20 mm appears likely, although some areas may see higher amounts. This rainfall in combination with the melting snowpack may result in pooling of water on roads and low-lying areas.
A very strong cold front will cross the region from northwest to southeast on Friday bringing an abrupt end to the mild spell. Rain will quickly transition to snow, with a risk of brief freezing rain during the changeover. Locally icy conditions are possible.
The snow will likely continue into Friday night and Saturday morning. Portions of eastern Ontario, particularly near the St. Lawrence River may see significant amounts of snow. The Niagara region may be affected as well, although likely to a lesser degree. These regions will be on the northwest edge of a major winter storm. Environment and Climate Change Canada will continue to monitor the situation.