Kirsch noted that hundreds of elderly people died in the 1995 Chicago heat wave and when Hurricane Katrina devastated New Orleans in 2005.
FEMA has set up temporary shelters for residents who come home to nothing, and for the workers who will help them rebuild.
A statement from the city indicated the facility still had some power.
Firefighters and medics responding to a Wednesday emergency call in Hollywood north of Miami found three people dead inside a building whose second floor the police chief later described as "extremely hot".
The state moved to place an emergency moratorium on the facility Wednesday night, which would block it from readmitting patients until the action is lifted. That patient was transported to a hospital, police said.
Meanwhile, in Central Florida, three people were found dead inside an Orlando home Tuesday from apparent carbon monoxide poisoning, officials said.
The city of Hollywood got a bit of good news on Thursday, as officials lifted a mandatory boil-water notice that had been instituted on Sunday. Low temperatures were in the upper 70s.
Officials acknowledged many of those questions at Thursday's briefing, but they also said they're still working on definitive answers.
Gov. Rick Scott issued a statement early Wednesday afternoon saying he had directed the state Agency for Health Care Administration and the Department of Children and Families to work with law-enforcement officials in investigating the deaths. Fans and spot coolers were being used at the Center on Tuesday, CNN reported.
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Johnson added that if Hibbard had been at home, she would've called 911 but since this was a nursing home she said she didn't want to "overstep" and stayed out of their way. "Can't give you anything more specific than that at this point".
Another 115 residents were evacuated from the Rehabilitation Center at Hollywood Hills.
But on some other quality indicators, the nursing home was below average. All residents have since been evacuated. Several patients at the sweltering nursing home died in Hurricane Irma's aftermath amid widespread power outages.
As of Wednesday morning, a WSVN helicopter was above the scene where officials were continuing to evacuate people from the home. Sharief, the Broward County mayor, has said the number was closer to 45 percent of traffic signals there.
"Most of the patients have been treated for respiratory distress, dehydration, & heat- related issues", doctors said during a news conference.
Meanwhile, Nelson wrote a letter to U.S. Department of Health and Human Services Secretary Tom Price and Centers for Medicare & Medicaid Services Administrator Seema Verma that said the Broward facility has a "history of higher than average deficiencies, below average ratings, and inadequate emergency preparedness" plans. Families looking for information can call the hospital hotline at 954-265-1074.
The Florida Health Care Association called Wednesday's deaths a "profound tragedy within the larger tragedy of Hurricane Irma". "The Rehabilitation Center at Hollywood Hills is responsible for the health and safety of their patients".
NextEra Energy Inc-owned FPL, which serves almost 5 million homes and businesses, expects to restore power to essentially all its users, in the eastern portion of Florida by the end of the weekend and the harder-hit western portion of the state by September 22. "We're conducting a criminal investigation, not ruling anything out at this time". Since the investigation began, the medical examiner went to the nursing home to claim that body and make it part of the probe, according to authorities.