A wave of thunderstorms and hail could hammer the Big Apple on the Fourth of July as a vicious five-day heat dome cooks revelers in nearly 100-degree swelter – making the holiday the hottest in nearly 20 years. Independence Day festivities Saturday afternoon and evening are in the crosshairs of the potential torrential rains, damaging winds and hail as temperatures are set to hit 95 degrees – the hottest July 4 since 2010, when the city baked under a blistering 96 degrees, AccuWeather senior