Nebraska sustained at least $6.79 million in damage to public infrastructure in December's unprecedented storms, according to an appeal by the state's congressional delegation to President Joe Biden.

Nebraska's senators and representatives wrote Biden in support of a request by Gov. Pete Ricketts seeking federal disaster aid.

The state experienced a record number of December tornadoes and its first-ever winter derecho on Dec. 15. A derecho is a series of long-lived straight-line winds.