THE DEADLIEST CYCLONE EVER, THE BOLAH CYCLONE

It's hard to imagine several hundred thousand people losing their lives from a single tropical cyclone, but in November 1970, that is exactly what happened.

The November 11, 1970 "BHOLA CYCLONE" moved into East Pakistan, now known as Bangladesh, and produced devastating storm surge flooding. As a result, at least 30.000 people in the low-lying region near the Bangladesh coast were killed by massive flooding from the powerful cyclone. 

The actual number of people killed varies by source and could be as high as 500,000. Using either figure, this is the deadliest known tropical cyclone in history.