An area of low pressure is expected to develop on Sunday night over South Dakota.
From there the low will move eastward and then drift into Ontario by Monday into Tuesday.
Precipitation will likely be in the form of rain.
The heaviest rain will probably fall over northwestern Ontario. Rainfall amounts of 30 to 40 mm are possible.
Across Southern Ontario, we cloud see anywhere from 15 to 35 mm of rain.
Heavy rain is expected in Central Ontario also.
Since the low has yet to develop, keep checking back for updates.