Folks throughout the region will see formidable rainfall totals from this event.
A widespread swath of 50-100 mm will cover southern Alberta—mainly concentrated on the foothills, including Calgary—with some communities potentially seeing more than 100 mm of precipitation. Some accumulating snow is even possible in the mountains.
30-50 mm of rain is on the way for much of southern Saskatchewan, with southwestern communities near Swift Current and Kindersley expecting 50-75 mm in the gauges through Monday.
WATCH BELOW: Heavy rain forecast marks 2013 flood anniversary, will it be a repeat?
Many are concerned that this will rival the 2013 flood in southern Alberta, when 50-90+ mm fell across the region. During the event from June 19-21, 76 mm fell in Calgary, while Banff picked up 92 mm.
Although rainfall amounts are expected to be similar, and even higher in some locations, one of the main differences is the amount of snowpack in the mountains.
At the Little Elbow Summit, there is currently around 5 mm of snow-water equivalent, whereas in 2013 it was sitting around 150 mm. That snowmelt enhanced the amount of water going into the river shed, which then helped to cause the widespread flooding of 2013.