if the SAT changes for 30° C , then you are in an updraft
The SAT didn't increase 30° C. The change in
indicated temperature was
'probably' due to the TAT probe(s) freezing up.
From the same paper:
-- Events occur with little or no reflectivity at flight level - ice particles are very small & poor reflectors of radar energy
-- While avoiding weather radar returns - not flying through heavy storm cores
-- low to moderate turbulence - low updraft velocities
-- No airframe ice - ice particles hitting airframe do not accrete