Intermittent flashes of light near the horizon, usually seen on a hot summer evening, unaccompanied by thunder and thought to be cloud reflections of distant lightning.
Distant lightning, often visible as a flicker in the atmosphere, whose thunder is inaudible.
Intermittent flashes of reddish or orange light near the horizon, usually seen on a hot summer evening and unaccompanied by thunder. Heat lightning is thought to be the reflection of distant lightning on clouds. Its color is believed to be due to the refraction of light in the atmosphere.