Scientists detect world's coldest cloud hovering over Pacific Ocean

A severe thunderstorm cloud that formed over the Pacific Ocean in 2018 reached the coldest temperatures ever recorded.

Scientists detect world's coldest cloud hovering over Pacific Ocean : Read more
That seems extra strange since above 11km temperatures soon begin to increase to about 0 deg. C. The temperature they claim would seem to require an altitude of 6x (~ 70km), well above the stratosphere. [From this graph.]

Perhaps the process in making vapor contributes to the cooling, thus keeping it closer to the 11km, or the instruments go funky at those temperatures.
 

ASK THE COMMUNITY