On 3/12/2013 11:20 AM, dpb wrote:
On 3/11/2013 9:52 PM, dpb wrote:

...

OK, I did go and look some...

http://www.srh.noaa.gov/oun/?n=events-19550525-stormelectricity

And, just to complete the loop, I found nothing indicating any recent
idea of the ~50 MHz "signature" being valid indicator of tornadic
activity but there is some relatively recent research that shows
indications of a very weak low frequency (1 Hz neighborhood)
electromagnetic component that appears generated from the various forms
of precipitation collisions within the rain shroud that has a frequency
that is correlated w/ the funnel size and rotational velocity as one
would expect something specifically related to tornadic activity should...

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