At ISA+15 the optimum Alt for 210T appears to be FL360 at M.82
And at ISA+20 the optimum/max Alt for 210 t appears to be down to FL310 at M.82
And at ISA+38... ? It is not even on the chart...
So if the weather reports of ISA+38 in the storm cell are true and AF447 was flying at FL350 into the "pool of warm air", what would be the result?