science

Not sure what the science is between 2 images with no source or timestamp and nearly 20 years of technological improvement between them is but this isn't the peak of Katrina

Katrina ultimately reached its peak strength as a Category 5 hurricane on the Saffir–Simpson scale on August 28. Its maximum sustained winds reached 175 mph (280 km/h) and its pressure fell to 902 mbar (hPa; 26.63 inHg), ranking it among the strongest ever recorded in the Gulf of Mexico.

It probably refers to its stats at landfall

Katrina weakened to a Category 3 before making landfall along the northern Gulf Coast, first in southeast Louisiana (sustained winds: 125mph) and then made landfall once more along the Mississippi Gulf Coast (sustained winds: 120mph). Katrina finally weakened below hurricane intensity late on August 29th over east central Mississippi.

But power doesn't equal damage for weather

[Katrina] is the costliest hurricane to ever hit the United States, surpassing the record previously held by Hurricane Andrew from 1992. In addition, Katrina is one of the five deadliest hurricanes to ever strike the United States

Sources:

https://en.m.wikipedia.org/wiki/Meteorological_history_of_Hurricane_Katrina

https://www.weather.gov/mob/katrina