The downpours that swept away a children's summer camp and wreaked deadly havoc on huge areas of Texas caught holidaymakers by surprise. As the death toll passes 90 people, questions are being raised about whether adequate flood warnings were provided and why people weren't evacuated ahead of the deluge.

Officials are being pressed about their response and whether there could have been a better warning system.

And yet, what happened in the early hours on Friday, when catastrophic flooding struck with a surge topping 20 feet, soon became a perfect storm turned into a once-in-a-lifetime tragedy. I first heard about the flood on Friday morning,