[RFI] Anyone ID the cause of this rain-initiated RFI?

[qrv at kd4e.com]

It's been generally RFI-quiet here ...

Just got 0.16" of sudden downpour a little earlier
and came inside.

Turned on the rig and from 550kHz - 14+mHz I heard
this in AM mode:

http://kd4e.com/kd4e-audio/recording-2april2015.mp3

I did not hear it on 17m or higher on my IC-7200
using the ZeroFive 43' vertical.

Anyone recognize the sound's likely source, please?

Thanks - David KD4E


-- 

*David* KD4E
ARES-EC Bulloch County, Nevils, Georgia USA

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