Every county has a ton of channels that only become active in disasters.
For Howard, most activity takes place on the north and south police dispatch channels, though when some significant issue is taking place any number of tactical channels can become active.
For fire, the main dispatch channel dispatches most everything, then assigns a tactical channel for the instance. Typically bravo 1 as a fireground channel, or incident operations, and some of the others.
By listening to the dispatch, you can hear what channel is assigned.
My recommendation is to add all channels and listen. You will soon determine what you want to listen to. Since a lot of the channels are seldom active (but the activity is significant when they are).
Mark
536/436/HP1/HP2/996XT/996P2/396XT/325P2/PSR800