Heat lightning often strikes mountainous areas or places that often experience summer thunderstorms.
Heat lightning is a flash of light that appears near the horizon, usually without any accompanying thunder. It is caused by distant thunderstorms and commonly associated with summer storms when temperatures are mild, hence the “heat” of the name. This type of lightning can be seen in many regions of the world, especially in areas where summer thunderstorms are common and in mountainous regions. It is not the same thing as cloud lightning, also called sheet lightning, a form of lightning that discharges inside a cloud, causing the cloud to light up.
A heat ray is a flash of light caused by distant storms.
Sometimes a heat ray is not lightning, but a cloud reflection of lightning from a very distant storm. In other cases, it is regular lightning that has formed in the distance, producing a flash rather than recognizable lightning. Especially when dark clouds cluster close to the horizon, the heat rays can really stand out and the absence of thunder can make them very scary. Sometimes it takes on a reddish tinge, thanks to the reflected and curved light.
There are a number of reasons why heat lighting is often not accompanied by thunder. First, sometimes the storm is simply too far away to hear thunder. In other cases, the thunder is muffled by weather conditions. Airborne particles and heavy clouds can muffle the sound of thunder, and thunder can also be interrupted by large landmasses such as mountains. In mountainous areas, heat rays can come from a storm that is actually very close, but the acoustics alter the sound waves, muffling or redirecting the thunder. Lightning without thunder can seem a bit surreal and can be very surprising without the audible cue of thunder.
Sometimes heat rays indicate that a storm is on the way. If storms usually come from the south and lightning is seen in the south, for example, that means the storm can go north, bringing lightning, thunder and rain to the observer. In other cases, the distant storm will never reach the observer, although it can put on a show.
Like other forms of lightning, heat lightning can be dangerous, particularly for people who are unaware of the storm’s proximity. While watching heat rays can be interesting, it’s a good idea to go inside or take cover in case the storm moves into the area, and people who are visually impaired may appreciate a warning from friends and neighbors who have spotted the lighting.