A prolonged and significant rainfall event will bring 75 to 125 mm of rainfall by Wednesday morning.
Rainfall will begin over southwestern Alberta later this evening and spread north by tomorrow morning. The heaviest rain will fall tomorrow. Rain will persist over the area until Wednesday. Locally higher rainfall totals of 150 mm or more are possible.
Look to your municipality and the province of Alberta (rivers.alberta.ca) for the latest information and recommendations.
Heavy downpours can cause flash floods and water pooling on roads. Localized flooding in low-lying areas is possible. Watch for possible washouts near rivers, creeks and culverts.
https://weather.gc.ca/warnings/report_e.html?ab12