2014-08-20, 17:18
You didn't say what you were that 'gets shutdown'.... but the "30 minutes since last visible strike" is an excellent 'rule of safety' ! Assuming I now also see an horizon to horizon clear sky. I would not depend on Blitzortung or any other network's data to be a 100% guarantee that an "anvil crawler" starting 50 miles away wouldn't decide to earth at my location!