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The main negative charge centre in a mid-latitude summer thunderstorm typically lies at a height of about

  • A.30 kilometres
  • B.6 kilometres
  • C.1 kilometre
  • D.15 kilometres

Answer: B

Correct answer: 6 kilometres

The main negative centre sits near the minus 10 to minus 20 degree level, which in a mid-latitude summer storm is around 6 km. Because it is fixed by temperature rather than by height, it lies lower in winter storms and at higher latitudes and higher in the deep tropics - a shift with real consequences, since a low charge centre is what makes winter positive flashes so powerful.

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