Another man was killed when a tree fell on a home in nearby Caddo Parish.
Hadnot's death was the 10th blamed on weather in the United States since Friday night: Two other people died in Texas, one in Oklahoma, three in Louisiana, and three in Alabama. Officials said no one was hurt, however.
The National Storm Prediction Center said Friday more than 18 million people in Louisiana, Arkansas, Texas and Oklahoma will be at an enhanced threat of storms that could include strong tornadoes and flooding rains.
Authorities say buildings have been damaged in the extreme weather, while there were widespread reports of trees and power lines being felled.
PowerOutage.us said Georgia had about 105,000 power outages on Saturday evening, with tens of thousands of outages also reported in MS and Louisiana. The PowerOutage.US website, which tracks outages, reported more than 40,000 outages in NY.
Two people in Louisville, Kentucky, were rescued by fire crews Saturday morning after a tree fell on their home, WAVE reported. Hundreds of thousands of people were left without power from Texas to Ohio.
A 10th person died in southeastern Oklahoma on Saturday morning after the 58-year-old man was swept away while his pickup truck was stalled in deep water on a flooded road, the Houston Chronicle reported.
On Alabama's Gulf Coast, Baldwin County canceled school activities including sporting events for Saturday.
An already deadly line of powerful storms is bearing down on the eastern half of the United States, threatening risky winds and tornadoes in the South and potentially crippling snow and ice in the Midwest through the weekend, with heavy rain and flooding in between. Weather forecasters issued tornado warnings for parts of Mississippi.
The Chicago Department of Aviation's online flight-tracking website showed that as of 10:30 a.m. Saturday about 950 flight cancellations were reported at Chicago's O'Hare International Airport and more than 50 flights had been canceled at Midway International Airport.
In the Pacific Northwest, winter storm warnings remain in effect for higher elevations, and heavy snow is forecast through Tuesday.
Freezing rain started to hit the Chicago area overnight into Saturday morning, and was expected to transition to snow.
Breezy conditions were forecast with gusts as high as 45 miles per hour (72 kph).