People with disabilities, people who can't afford it and people who don't want to abandon their pets are among the many who can't easily get up and leave before a hurricane.
More people — and more buildings to house them, often in coastal areas — mean that a major hurricane could become more costly and destructive. That's raising concerns as Hurricane Ian approaches.
As Hurricane Ian's eye moves closer to the Florida gulf coast, millions of residents have been told to evacuate. Forecasters say Ian will bring winds, a storm surge and tornadoes as it comes ashore.
Such massive storms are fairly rare, and it's even more rare for them to make landfall. NOAA says that for such storms, "catastrophic damage will occur" with electricity outages "for weeks or months."
Hurricane Ian delivered an eerie omen to coastal Florida residents Wednesday morning: Its winds pulled massive amounts of water out of Tampa Bay and other areas.
Nearing the Florida Gulf Coast, Hurricane Ian is now a Category 4 storm. Forecasters call it an extremely dangerous storm with the potential for catastrophic winds and a life-threatening storm surge.
St. Petersburg and Tampa are preparing for what could be their first direct hit by a major hurricane in over a century. Officials there are urging people to comply with evacuation orders immediately.