Probably end up a rainstorm, as cold air will once again be an issue, if this storm does happen. There’s no high pressure in Quebec for cold air source should storm wrap up.
OKX list of July 4th weather:
http://www.weather.gov/media/okx/Climate/CentralPark/4thofJulywx.pdf
OKX July 4th top 5 weather (wettest, warmest, coldest):
http://www.weather.gov/media/okx/Climate/CentralPark/Top54thofJuly.pdf