Here is the 500mb level for 6pm MDT Sunday evening according to the 00Z NAM:
It shows 55 knots at the 500mb level coming across the Rockies from the SW as an upper low pushes to the east. Height falls. Cooling aloft. The air mass over parts of Alberta mainly between Calgary and Edmonton quickly becomes unstable in the late afternoon and evening.
Here we can see a lee low form just north of Calgary:
Where we see the higher moisture converging and streaming in from the east on the north side of the low is where the worst storms are likely:
The moisture bullseye happens to be just northwest of Red Deer on that map.
Biggest concern from a storm lover's perspective is the lack of moisture in the boundary layer tomorrow. 15C dewpoint is satisfactory... but it doesn't seem to be very widespread on the models. 0-1km SRH (100-180) and 0-3km SRH (400-500) values for 6pm Sunday are impressive for Alberta. I believe they're the highest values so far this year. Strong winds seems to be the biggest threat... followed by hail, risk of a tornado, and possible very heavy downpours and localized flooding. I've seen CAPE values higher this year so I don't think the hail should be tooo huge... hopefully.