Case Study

Little Tennessee River

  • Location: Needmore, TN, USA
  • Dates: Aug 31, 2021 to Sep 04, 2021
  • Observed Flows: 713 to 6560 cfs


HydroForecast accurately predicted the timing, peak, and limb of one of the largest hurricanes to hit the southeastern United States. 

Forecasted flows and precipitation issued on 8/31/21

Event Description

Hurricane Ida made landfall in Louisiana on August 29, 2021, the 16th anniversary of Hurricane Katrina. It was a Category 4 storm and caused estimated damages over $50 billion and multiple fatalities. By the time Ida reached Tennessee, it had devolved into a tropical depression yet continued to unload significant precipitation, with nearly 10 mm/hr falling at Little Tennessee at Needmore during the event’s peak. 

HydroForecast’s predictions correctly identified when the storm would reach the basin, how much inflow it would produce, and when it would recede.