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Originally posted by Tuebor
It is common for heat lightning to flash with no thunder accompanying it .
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Lightning Without Thunder
Scattered thunderstorms often occur in hot, humid weather. Some pass overhead, bringing rain. Others may pass a moderate distance away. We see lightning forked, sheet, ribbon) and hear thunder, but no rain falls. Finally, there are storms that pass a long distance from us whose presence is only noted by their clouds and flashes of yellow-tinted lightning.