The National Weather Service is continuing its survey of the deadly tornado that struck Arkansas on Sunday.
Warning coordination meteorologist John Robinson says surveys of the storm track will continue Tuesday and Wednesday. Two forecasters also plan to fly the track with the Civil Air Patrol on Wednesday.
Robinson says the tornado is now considered at least an EF3 but a final rating isn't expected until late Wednesday.
The weather service says Sunday's twister is the strongest tornado to hit Arkansas since May 2011, when an EF4 tornado hit the Denning area, killing four people and injuring 27 others.