"At the moment its surreal, our landmarks are gone -- road signs, places where you know to turn -- we're doing search and rescue, going house to house on that six mile strip," Stammer told "GMA."
Federal Emergency Management Agency Region VII set up a response coordination center and sent a liaison team to the Missouri state emergency communications center, according to a FEMA official.
"Basically it's an all-out effort to get all of the most important resources available for this type of situation down as soon as possible," a state emergency management representative said.
In total, 70 tornadoes were produced by the storm system since Friday, including at least 47 tornadoes Sunday. Tornadoes were reported in seven states from the Canadian border to Oklahoma. Warnings and watches were posted from Texas to Michigan.
ABC News' Jackie Meretsky contributed to this report.