A family member booked on AC 183 tomorrow (Thursday) received this message yesterday (Tuesday): "Flight AC 183/12 Oct from Toronto to Vancouver has been cancelled due to bad weather which has impacted the departure/destination airport or flight path for your journey." Rebooking tool put her on AC 103, less than an hour later, and two slightly earlier flights are apparently also unaffected. Seems quite bizarre! An exceptionally brief weather bomb predicted 48 hours in advance? Something more sinister? Thoughts anyone?