**Hurricane Michael upgraded to a Category 5 at time of U.S. landfall**
Tropical Cyclone Report: https://www.nhc.noaa.gov/data/tcr/AL142018_Michael.pdf
Some interesting excerpts:
"Re-construction of the instrument’s raw brightness temperatures during the dropout period by the NOAA AOC indicates that the maximum 10-second SFMR wind estimate was 152 kt near 1707 UTC. The SFMR winds support an intensity greater than 135 kt, especially if the 152-kt value is correct and uncontaminated by wave shoaling in water about 89 ft deep. However, there is a significant caveat regarding the SFMR data, as experience during Hurricanes Irma, Jose, and Maria in 2017 suggests the possibility that the SFMR has a high bias at the wind speeds in question. Research to determine if this is the case is currently underway."
"An objective analysis of the KEVX data using the GBVTD technique (not shown) suggests maximum winds of near 160 kt at 3 km during the last few hours before landfall, which would yield surface winds of 135–140 kt using the NHC reconnaissance adjustments. However, the winds in this analysis were notably lower than the 152-kt flight-level wind and the subjectively analyzed winds from radar in the southeastern eyewall. The quality of this analysis is questionable due to apparent issues in the automated GBVTD technique properly locating the center of Michael, which is critical to the wind analysis. There is also similar uncertainty produced by the maximum wind location relative to the radar site mentioned above for the subjective analysis."