The temporary patch talkgroups change a lot, but they only have about three possible configurations that it could be.
1.) Service 1 and 2 patched together.
2.) In the evening, they'll patch Patrol 2 and 3 together. Patrol 1 remains separate.
3.) Patrol 1, 2 and 3 all patched together. This is called "Citywide" and usually happens in the middle of the night or early morning.
So if you find a new talkgroup with OPD traffic, listening to addresses and the content of the messages will help you figure out which of the three it is without using software.