Torrents of rainfall came down on some communities of southern Manitoba from Thursday to Sunday. Winnipeg had its fair share of flooding rains back on Thursday when as much as 70 mm fell over parts of the southwest end. Meanwhile, only minimal amounts fell in other parts of the city.
In southwestern Manitoba, it was two large areas of thunderstorms which dumped copious amounts of rainfall. Firstly, early in the morning Saturday, then again early in the morning on Sunday. 100+ mm of rain fell locally with a few communities issuing states of emergency due to flooding. Frequent lightning was also seen making for quite a spectacle. 40+ mm of rain in Brandon on Saturday morning severely flooded some streets. Overland flooding is a major concern across much of southwestern Manitoba as well as localized sections of the RRV.
A slow moving line of thunderstorms close to the escarpment on Saturday also dumped unimaginable rainfall amounts. Radar estimates point at as much as 150 + mm in just a few hours northwest of Portage. That doesn't even include the rain that fell on Sunday.
Here's a map summary of rainfall amounts between Thursday and Sunday (courtesy of Manitoba Agriculture, Environment Canada and Cocorahs):