The Cape Coral stream is fab.Nasa have some samples of 'sferics, tweeks and whistlers here:
I hear without clear frontiers, without divining an isolated source, hearing is better at integrating than analyzing, the ear knows how to lose track.. We breathe background noise, the taut and tenuous agitation at the bottom of the world
World Wide Lightning Location Network
Time as weather... a cloud is an aggregate, a nebulous set, a multiplicity whose exact definition escapes us....
Serres M. Genesis, University of Michigan Press 1998