Just to add some meat to the bones and for the benefit of the OP I've looked back at some charts/data for Sunday AM.
Tropause "heights":
Over Sudan, equatorial air, the Tropopause was forecast at 55000 feet, Over Eastern Europe, in air of polar origin the tropopause was down at around 25000 feet.
Crusie altitude temperatures:
Over northern Africa at an altitude of 39000 feet it was forecast to be -53 celsius.
Over Lyon at 37000 feet the temperature was forecast to be -55 celsius.