A rapidly intensifying disturbance in Kansas is setting its sights on Ontario.
It will track towards Lake Michigan Sunday night and cross northeastern Ontario Monday.
Rain, at times heavy, will arrive Sunday evening in southwestern Ontario and quickly spread to all other regions overnight.
Rainfall amounts of 15 to locally 30 mm are expected before it tapers to showers on Monday. This may have some impact on the snow melt for parts of the snow belt regions around Lake Huron and Georgian Bay which received significant snowfall in the past week. Some localized flooding is possible in these areas.
As the storm crosses the province on Monday, strong winds will strengthen to 50 gusting to 70 or 80 km/h out of the southwest. Localized gusts to 90 km/h are likely in some areas. Winds of this magnitude may bring down some limbs or the odd tree, and cause sporadic power outages.
Wind warnings may be required.
The temperature is forecast to rise to 13 C (55 F) in Sarnia-Lambton Monday and then sharply drop to a high of -1 C (30 F) Tuesday.