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heat lightning

noun
🔊/ˈhiːt laɪtnɪŋ/
🔊/ˈhiːt laɪtnɪŋ/
 [uncountable] (North American English)
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  1. flashes of lightning without thunder, seen in the sky on hot nights
    • Sometimes heat lightning can appear to be orange.有时，高温闪电似乎是橙色的。
    Topics Weatherc2