It's winter in DXB and temps are between 25 to 30 C these days. Pretty much like a summer in Europe where storms and hailstones are common, I don't see why CBs in the region wouldn't be able to carry the same energy and produce hail.
Now as far as the global warming is concerned I think you should look at this year's El Nino which is quite intense and also affect the global climate.
Let's keep talking about the CO2 just like industrialized governments are willing instead of raising concerns about other forms of pollutions. Who knows, we might end up cutting all trees as they are the first CO2 producers...