In 2005, hurricane katrina brought a storm surge that overtopped the levees and flooded new orleans, causing over 1400 deaths and perhaps $100 billion in damages. this flooding of new orleans from a big storm was:

An occasion that researchers had cautioned about for a considerable length of time, in view of the known size of tropical storms, and the sinking of the city and the Delta. Researchers and organizers did not know precisely when a major sea tempest would hit New Orleans and undermines the city, yet genuine appraisals had reliably featured the likelihood for quite a long time. 

The congress completes the diagram