Tropical storm Isaac heads north from New Orleans – in pictures

Research students from the University of Alabama measure wind speeds as hurricane Isaac makes landfall in New Orleans Photograph: Eric Gay/AP

Errol Ragas walks past a flooded cemetery to recover dry blankets from his home in Oakville Photograph: John Moore/Getty Images

A group of friends stand against strong wind and driving rain on the beach in Gulfport Photograph: Keystone/Zuma/Rex Features

A news reporter stands in the rain with camera crew Photograph: IBL=/=Rex Features

Chuck Cropp wade through floodwater in New Orleans Photograph: David J. Phillip/AP

Henry Cox pulls his boat through deep water while rescuing residents in LaPlace Photograph: Chris Graythen/Getty Images

A man holds a broken umbrella in the wind Photograph: Eric Gay/AP

Errol Ragas salvages blankets from his home as rising waters from hurricane Isaac flood in Oakville Photograph: John Moore/Getty Images

People in the high surf on the Lake Pontchartrain front in Mandeville Photograph: Ted Jackson/AP

A car sits submerged in the flood waters in LaPlace Photograph: Chris Graythen/Getty Images

Rescue workers transport residents trapped by rising water in LaPlace Photograph: Chris Graythen/Getty Images

Storm surge fills the parking lot and Biloxi Small Craft Harbor around McElroy's restaurant Photograph: Keystone/Zuma/Rex Features

People wait in line to eat at one of the few restaurants opened in the French Quarter Photograph: Jonathan Bachman/Reuters

Storm residents take refuge at a high school auditorium in Belle Chasse Photograph: Frederic J. Brown/AFP/Getty Images