On 30/03/15 14:34, Graham Easterling wrote:
nothing on the radar this time, it's all too fine.

It's not the droplet size - it's the fact that the rain is forming and
falling below the radar beam, so it wouldn't show on the output.

Unlike earlier when the raindrops intersected the radar beam giving the
appearance of a solid rain area , but there was a dry layer beneath the
rain-bearing cloud which enabled evaporation of most of the rain before
it reached ground level - hence your experience of a largely dry day.

It is interesting that you experienced two situations in the same day
whereby care was needed in the interpretation of the radar output.


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Freddie
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