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Heat lighting (or, in the UK, 'summer lightning') is a term given to regular lightning that is too far away for the thunder to be heard. You can, however, see the lightning reflecting on the clouds, usually near the horizon. Since heat lightning is most likely to be seen in association with air mass thunderstorms in the warm season, the term 'heat' may have been used because these flashes are often seen when surface temperatures are warm.
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