I learned the 'death outflow' from Jim Cantore. It works about 75% of the time or more.
The Death Outflow basically looks like the outflow you would see from any thunderstorm complex. A thin line of clouds/ light convection, detached from the parent cloud.
On the RGB satellite pic. It resembles a jellyfish or Portugese Man-O-War.
The word " poof" would be a good example to describe it. You'll know it when you see it.