#Ida is now forecast to be a Category 4 #hurricane in the northern Gulf. 5 hurricanes have brought sustained Cat. 4-5 winds in Louisiana per NOAA on record (since 1851):

Last Island (1856)
Cheniere Caminanda (1893)
Betsy (1965)
Camille (1969)
Laura (2020)

Katrina was Cat. 3.
Camille brought sustained Cat. 5 winds to Louisiana. Four other storms brought sustained Cat. 4 winds. NOAA's hurricane impacts database is here:

aoml.noaa.gov/hrd/hurdat/All…
We also have recently advocated to categorize hurricanes using pressure rather than wind, as it correlates better with storm size and normalized damage. Using that categorization, Katrina would have been classified as a Category 5 at landfall:

journals.ametsoc.org/view/journals/…
Last Island, Cheniere Caminanda, Betsy and Laura all made landfall in Louisiana. Camille made landfall just east, near Bay Saint Louis, Mississippi, but still brought sustained Cat. 5 winds to Louisiana per NOAA.

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