As reported by Off The Grid News, the plan – which was reviewed during a workshop in April hosted by the National Oceanic and Atmospheric Administration (NOAA) and attended by
White House officials – acknowledges that predicting space weather, like a solar flare, is difficult at best. What's more, despite all of our technology, there would be almost no warning if such an event were to occur.

As others have noted, a massive solar flare would be the naturally occurring equivalent of an electromagnetic pulse attack via nuclear-tipped ICBM – and would devastate the electric power grids of even the most modern nations. What would ensue afterward is pure chaos.