BigDaddy,
Welcome to the Corrupted SD Card Club!! Sorry to hear you are the newest member, not something I would wish on most people here.
You should read my thread on this and I think we need to track this problem , as I believe it is a problem and we will hear more about this situation in this season.
I first want to say that I doubt your problem had anything to due with a near field lightening hit, but more with multiple power off and on cycles? Discount all the lighteningphobes that will tell you you should have turned off the scanner, disconnected the probably non existent outdoor antenna so forth. In my case I was not interested or thinking about jumping out of bed at 5 am to turn my scanner off.
I have tried all but the very last suggestion in my thread to bring my SD card back from the dead. None of the software tools worked, the card cannot be properly read or formatted by 3 different Windows machines each running a different OS. 2 video cameras were unable to format the card internally. As I have mentioned, I spent $60 in time on a $6 card at this point.
I have additional cards on the way and my long term plan is to have a clone card taped on the outside of the scanner, for my 436HP I can tape a card on the inside of the battery door.
Would really like to hear more about your experience, I expect this to be a re-occurring theme over the next 4-5 months as storm season moves across the country.