NEW ORLEANS, LOUISIANA - AUGUST 29: The Mississippi River is seen ahead of Hurricane Ida on August 29, 2021 in New Orleans, Louisiana. Residents of New Orleans continue to prepare as the outer bands of the hurricane begin to cut across the city. Ida is expected to make landfall as a Category 4 storm later today. (Photo by Brandon Bell/Getty Images)

Hurricane Ida was so powerful it made the Mississippi River flow backward! How strong were the winds of Hurricane Ida?  So strong they made the Mississippi River flow backward. According to the U.S. Geological Survey, the storm created a ‘negative flow’ at the point where the river empties into the Gulf of Mexico – sending the water backward for about two hours. A similar phenomenon happened during Hurricane Katrina in 2005 and Hurricane Isaac in 2012.

Gallery: Hurricane Ida and Flooding