A huge heat dome is expected to start baking much of the U.S. on Sunday and shatter records with temperatures up to 25 degrees above normal as the week wears on and summer officially starts Thursday. Warming ocean water could also fuel the first tropical storm of the Atlantic hurricane season, CNN warned Saturday. The heat dome, in which hot air is trapped by high atmospheric pressure, is forecast to start building Sunday over the East Coast and expand west across the Midwest and Great Lakes regions. Temperatures in New York City are likely to reach the mid to high 90s on Tuesday through Frida…