mother casters storm. triggering a flash flood emergency and intensify into a named leaving neighborhoods under water. morgan chesky is in new orleans tonight. reporter: tonight louisiana under a state of emergency after a fast-moving storm threw waterspouts and flash flooding that brought new orleans to a soggy stand still. in some areas, nearly ten inch of rain in just two hours. disabled cars all over the rain. it s like a hurricane. reporter: canal street living up to its name. i m struck. i m stranded out here. i don t know what to do. reporter: when it comes to keeping the city dry, these drainage canals are crucial. only problem they can only handle so much water, leaving these low-lying neighborhoods at risk with nothing more than a few inch of rain. the building tropical threat casting a shadow as far as texas. be prepared for this particular storm. this is the time to start getting