Delaware Gov. Jack Markell on Sunday expanded an executive order that declared a state of emergency to include that businesses in the mandatory evacuation zone close at 6 p.m.
The mandatory evacuation, which includes Sussex, Kent and New Castle counties, began Saturday at 8 p.m. and must be completed by 8 p.m. Sunday night.
"This storm is severe and its potential damages significant," Markell said in a statement.
"It is critical that residents in areas of greatest risk leave those areas now before the storm's full force is felt and lives are put at greater risk."
The Delaware governor spent much of Sunday with emergency responders and state workers at the Delaware Emergency Management Agency and in flood-prone areas, his office said.