Meteorologists are planning an aerial survey of the destruction caused by at least 10 tornadoes in Arkansas late last week.
Friday's tornadoes killed seven people, damaged or destroyed about 400 homes and knocked out electrical and telephone service in nearly 20 counties.
Ten tornadoes have been confirmed, up from an earlier count of eight.
Meteorologists say one twister may have traveled 45 miles.
Last week's severe weather followed tornadoes that killed 13 people in Arkansas in February. Then came a foot of snow and flooding that killed at least five more.