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2005 is the year when Hurricane Katrina hit the Gulf coast region including Louisiana.
The values at Y-Axis indicate the wind speed and the values at X-Axis indicate the number of the days passed since each of the hurricanes started.
The data for Irma is from Weather Underground: https://www.wunderground.com/hurricane/atlantic/2017/hurricane-irma
The data for the others is from NOAA (National Oceanic and Atmospheric Administration) https://www.ncdc.noaa.gov/ibtracs/index.php?name=ibtracs-data