Is this why they call it 'fall'? Calgary expecting a 25 degree temp drop

After one week of above seasonal highs in Calgary (peaking at almost 22 C Thursday) temperatures are expected to drop to well-below seasonal averages starting Monday. By Tuesday, Calgary's daytime highs will be lower than the average overnight lows, and unfortunately a rapid recovery out of this trend is unlikely. Zonal flow in the upper patterns will result in daytime highs remaining below freezing for at least three days.A series of low pressure systems near the Arctic Circle are expected to a