The passage of Hurricane Isaac generated a long-lived, nine-day tornado outbreak that affected the Central and Eastern United States from August 27 to September 4, 2012.

After acquiring a well-defined center of circulation and deep atmospheric convection, the disturbance was deemed organized enough to be declared a tropical depression by 06:00 UTC on August 21 while located about 720 mi (1,160 km) east of the Lesser Antilles.

The cyclone attained peak winds of 80 mph (130 km/h) prior to making two landfalls, one at the Southwest Pass over the Mississippi River and the second near Port Fourchon, Louisiana.

[3] On August 22, the Storm Prediction Center noted the potential for severe weather to evolve in association with Isaac; however, considerable model uncertainty precluded the addition of a threat area.

[4] Three days later, a severe threat area was outlined across southern Georgia, southeastern Alabama, and northern Florida as the outer bands of the hurricane were forecast to rotate into the region.