The last hurricanes to make landfall in the US at category 4 or greater were: Charley (2004, FL) Andrew (1992, FL, cat 5) Hugo (1989, SC)
National Weather Service
 @NWS
25 Aug 2017
Harvey continues to intensify according to @NHC_Atlantic and is now a category 4 #hurricane with maximum sustained winds of 130 mph.

Aug 26, 2017 · 12:57 AM UTC

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But the scary part is this bit of the advisory:
Mark Sudduth
 @hurricanetrack
25 Aug 2017
Are you serious? This is absolutely astounding please share this and make sure people understand what this means.
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Going back further in history, based on en.wikipedia.org/wiki/List_o… and en.wikipedia.org/wiki/List_o… : Frederic (1979, AL) Camille (1969, MS, cat 5)
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Replying to @davidbaron
Trivia: Andrew was considered Cat 4 at the time; was only upgraded to Cat 5 years later on basis of buoy readings.