This doesn't sound like its going to be an easy issue to solve.

I found that its my strobes that set off the strike finder.  After I chatted with L3, I got the following email:

There are a few things that can be accomplished to help reduce or eliminate the false strikes. First of all, make sure there is proper separation between the Stormscope wiring and the strobe light wiring. In addition, the shielding and grounding for the strobe lights should be nowhere near the Stormscope antenna or antenna cable. I would recommend using separate ground points for the Stormscope and strobe lights. Also, make sure everything is properly grounded and shielded. Is the wiring for the strobe lights shielded? If not, then you might want to consider using shielded wires. Also, make sure the Stormscope antenna cable is properly shielded and terminated.

 

If after determining that everything is shielded, properly grounded, and good separation, then you may have to consider relocating the Stormscope antenna. However, I think with some creativity and trial and error, you should be able to reduce the amount of false lightning strikes.

-Dico