The following link to New Madrid helicorders includes a brief explanation of their helicorders at bottom of page. Apologies for the confusion in my last post; the link I tried to post didn't 'take' in URL box.
Link is:
http://folkworm.ceri.memphis.edu/heli/

Check out Charleston and New Madrid, MO helios for 20 Sep 2005 and today; doesn't appear to have been bad weather there so ???.