You're right about that, I just think it has to be a different reason other than SST. Maybe July normally has more shear than either August or September in the areas where these things usually form? The only memorable July storm I can think of that reached our area was Bertha in July 1996. It hit Wilmington, NC at nearly Cat 3 status (I think it was the earliest major hurricane at the time) and it rode up right along the coast and it was a 65 mph tropical storm when it hit land again near JFK. Close to hurricane force gusts near Babylon and up to 7" of rain in the Poconos.