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Assertion (A): Intracloud flash rate responds to updraught intensification sooner than the cloud to ground rate.
Reason (R): Charging begins aloft in the mixed phase region before the lower charge centre develops.

  • A.Both A and R are true, and R is the correct explanation of A
  • B.Both A and R are true, but R is not the correct explanation of A
  • C.A is true but R is false
  • D.A is false but R is true

Answer: A

Both are true and the reason gives the sequence, and this is why total lightning is preferred for nowcasting. Cloud to ground activity lags the intracloud signal noticeably. Total lightning is therefore the more useful measurement.

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