An example taken from the Boeing article I already linked here:
AERO - Engine Power Loss in Ice Crystal Conditions
One can see from the temperature legend that the white part at the top of this tropical cloud (a fully developped typhoon) is below -70°C while the aircraft path (stars) is right in the middle of it.
Nonetheless, see below the flight conditions reported during the descent into Taipei.
INFRARED IMAGE WITH AIRPLANE TRACK
In this infrared satellite image from about the time of an engine event, bright white indicates colder cloud, and therefore at high altitude. The airplane penetrated the upper altitudes of a fully developed typhoon, yet the pilot did not see any flight level radar returns. The asterisks represent the aircraft path from left to right on descent into Taipei, with the event noted in purple.
- A commercial airplane on descent, flying in convection conditions, experienced a TAT anomaly. (The anomaly is due to ice crystals building up in the area in which the sensing element resides, where they are partly melted by the heater, causing a 0 degrees C reading. In some cases, TAT has stabilized at 0 degrees C during a descent, and may be noticeable to pilots. In other cases, the error is more subtle, and not a reliable-enough indicator to provide early warning to pilots of high concentrations of ice crystals.)
- At 38,000 feet (-42 degrees C), the pilot encountered moderate turbulence and noted some lightning in the vicinity.
- A brief power-loss event occurred at 30,000 feet — the engines restarted quickly.
- There were no radar echoes at the altitude and location of the airplane.
- An absence of a response from the ice detector indicated that no supercooled liquid was present.
- The pilot reported heavy rain at -25 degrees C.
- Initial report of rain on the windscreen was later determined to be ice crystals, and confirmed by the pilot to have a unique sound.