"heat lightning." YourDictionary, n.d. Web. 14 January 2019. <https://www.yourdictionary.com/heat-lightning>.
heat lightning. (n.d.). Retrieved January 14th, 2019, from https://www.yourdictionary.com/heat-lightning
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.