Mississippi State Senator Merle Flowers wrote and introduced this legislation and nine others c0-authored the bill. It passed the Senate on February 4 by a unanimous vote and amends Section 33-7-303 of Mississippi Code of 1972 to “explicitly restrict the power to confiscate firearms and ammunitions in an emergency.”
The NRA said this on their website:
In the wake of Hurricane Katrina, the Mississippi Legislature amended the state’s firearms preemption law to prevent cities and counties from interfering with the lawful transportation and possession of firearms in one's home, vehicle, or place of business during a state of emergency or natural disaster. Senate Bill 2036, would further amend the state's emergency powers laws to create additional Second Amendment protections for law-abiding citizens during a future crisis.
I suppose they just didn't want something like this to happen in their state: