The Water Security Agency says even more areas than first anticipated will likely see flooding.
The agency is now forecasting above normal, or well above normal, run-off in the entire southern half of Saskatchewan.
Areas where flooding is likely include Regina and Moose Jaw, stretching southeast to Weyburn, as well as Saskatoon to Prince Albert and west to North Battleford.
The problem is that there was more snow than normal in March in many areas and the cold air is hanging around. Agency officials say there's an increased risk of a high flood peak if temperatures rise too quickly and the snow melts too fast.