Welcome back to Monsoon Mechanics, I am Tasnim Rahman. Today we build a cyclone from scratch. You need warm water, and the Bay of Bengal is very warm. You need moist air, a nudge of spin from the turning Earth, and quiet winds high up so the storm is not torn apart. Give it five days and you have an eye. I will take you through each stage the way I watched it happen on the screens in Dhaka, and then explain the cruel geography that makes our storm surge worse than almost anywhere else. We will talk about Cyclone Sidr in 2007, what the warning system learned, and I have a fisher from Barguna describing the signal flags on his beach. This one matters. You are listening on Witspeak Podcasts.