And looking out of the windscreen , we saw something I ' ve never seen before : a sort of limp sausage - shaped cloud sticking out of the side of a thunderhead , hanging down towards the Shannon Estuary . It looked like a cloud with a ponytail . Odd thing . The twisting of the tip hanging down made it more obvious , though : it was a tornado !
What may have caused the tornado ?
Pick the best answer from the following options:
- The wind had been strong that day .
 - They were having a storm while it was hot outside .
 - None of the above choices .
 - They were having a storm while it was cold outside .


They were having a storm while it was hot outside .