Within Sentinel there are two different types of broadcasts which are 'Prepared Broadcasts' and 'Broadcasts'. Here is a brief description of each broadcast type.
Prepared Broadcast: Allows broadcast to be created ahead of time for potential crisis scenarios (i.e. office fires, transportation disruption etc) which can be sent as and when needed. Also suited for repeat broadcasts that are sent on fairly regular basis.
Broadcasts: Ideally used for one off broadcasts which do not repeat.