Officials began recommending visitors to leave potentially affected areas by three days before Isabel made landfall. Governor Minner mandated all schools to be closed on the day of the hurricane's landfall, and recommended all residents in mobile homes to evacuate and for businesses to close. The University of Delaware preemptively canceled classes.
Authorities started advising visitors to depart potentially hazardous zones three days prior to Isabel's landfall. Governor Minner ordered all schools to be shut down on the day of the hurricane's arrival, and suggested that all residents residing in mobile homes should evacuate and that businesses close. The University of Delaware cancelled classes ahead of time.