Hurricane Irma - Evacuation

Hurricane evacuations are anything but routine. While Florida has seen its share, Hurricane Irma pressed our systems to the limit. Nearly 7 million evacuees covering 38 counties reportedly evacuated – the largest in state history. This figure dwarfs the 1999 evacuations during Hurricane Floyd where some 2 million residents clogged the state’s roadways. Evacuations during Hurricane Irma were further complicated by the ever-changing landfall forecast, fuel distribution challenges, shelter space needs, and efforts to provide timely and accurate information to the public. Before an evacuation is ever ordered, a range of issues and modeling assumptions occur that the public, and perhaps even elected officials, are not familiar with.


Hurricane Irma was the most powerful Atlantic Ocean hurricane in recorded history. By multiple accounts, the storm was also directly responsible for the largest mass exodus in U.S. history, with nearly 7 million people across Florida, Georgia, and South Carolina being asked to evacuate their homes.

According to Florida’s Department of Emergency Management (DEM), nearly 6.8 million Floridians evacuated their homes in the lead up to hurricane Irma, “beating 2005’s Houston-area Hurricane Rita exit by millions.” Media outlets described police going door to door “telling people to leave to avoid life-threatening rains, winds, and flooding,” as well as “large traffic jams on Interstates 95 and 75 and the Florida Turnpike.” Additionally, the Federal Aviation Administration reported that Miami’s traffic controllers handled 11,500 flights on the Thursday before the storm compared to 8,800 one week prior. As the National Weather Service outpost in Key West tweeted Friday night before Irma’s landfall: “THIS IS


Total Evacuation Orders During Hurricane Irma


Total Evacuations Ordered

Data from DEM’s Constellation system shows 54 of Florida’s 67 counties ended up issuing evacuation orders in response to Hurricane Irma. Mandatory evacuations were ultimately issued in 42 counties, while a remaining 12 counties never went beyond issuing voluntary evacuation orders.


The number of counties under evacuation orders peaked on September 11th, but declined quickly after.  By September 17th, no counties remained under evacuation orders.


An Estimated 6.8 Million Floridians Evacuated Their Homes for Hurricane Irma


County Evacuation Map
Mandatory and Voluntary Evacuations

Counties are responsible for creating evacuation zones using data from both the federal and state governments, while also taking local factors into account. Counties also take the lead in issuing evacuation orders within their jurisdictions, whether this is done though the board of county commissioners or the emergency management director. While a hurricane evacuation is anything but routine, state and local emergency  management officials adjusted to 10 different evacuation scenarios over the course of Irma’s track.

1Aarian Marhsall. “4 Maps that Show the Gigantic Hurricane Irma Evacuation.” WIRED. September 8, 2017. Available online at: www.wired.
2Kelly Swanson. “The massive evacuation effort in South Florida has million fleeing Hurricane Irma.” Vox. September 8, 2017. Available
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