Environment Canada has issued a special weather statement for London-Middlesex predicting at least 4-8 cm of snow by Sunday morning.
The weather agency says a deepening low pressure area from Texas will bring the first significant snowfall of the season to many parts of southern Ontario. Very strong southwesterly winds are also expected over areas near eastern Lake Erie, Lake Ontario and the St. Lawrence River.
The majority of the snowfall is expected tonight and will be a mix of rain and snow.
Poor winter driving conditions may occur due to low visibility and accumulating snow on untreated roads.