Are the two hurricanes Harvey and Irma an indication of Global warming with stronger and more frequent hurricanes?
I think not. Let us look at all named major hurricanes hitting the U.S mainland since naming of hurricanes started.
1950 Easy, Fl; King, Fl
1951
1952
1953
1954 Hazel, NC, SC; Carol, RI.
1955
1956
1957 Audrey, La.
1958 Helene, NC.
1959 Gracie, SC.
1960 Donna, Fl.
1961 Carla, Tx.
1962
1963
1964 Hilda, La.
1965 Betsy, Fl, La.
1966
1967 Beulah, Tx.
1968
1970 Celia, Tx.
1971
1972
1974 Carmen, La.
1975 Eloise, Fl.
1976
1978
1979 Frederic, Al.
1980 Allen, Tx.
1981
1982
1983 Alicia, Tx.
1984
1985 Elena, Fl, Ms; Gloria, NY, NC.
1986
1987
1988
1989 Hugo, SC.
1990
1991
1992 Andrew, Fl, La.
1993 Emily, NC.
1994
1995 Opal, Fl.
1996 Fran, NC.
1997
1998
1999 Bret, Tx.
2001
2002
2003
2004 Ivan, Al; Charlie, Fl; Ivan, Fl; Jeanne, Fl.
2005 Dennis, Wilma, Fl; Katrina, La, Ms; Rita, La. “Hurricanes are going to be worse and more frequent”
2006
2007
2009
2010
2011
2012
2013
2014
2015
2016
2017 Harvey, Tx; Irma, Fl. “I told you so!”