At my company we are supposed to call out "Attention Crew, on station" twice in any situation that may lead to an evacuation. This will make CAs take the best position for an evacuation (like going to the overwing exits, for CA2 on CRJ), but also to report important observations to the flight deck (smoke fire Iín/outside the a/c). It can be followed by "passenger evacuation" or "cancel alert", also spoken twice.