Call it “The Great Stall.” Hurricane Florence lingered over the Carolinas for four days, dumping some 30 inches of rain. Flood waters are still rising, even as Typhoon Mangkhut, a superstorm 500 miles across, rakes the Philippines and Hong Kong and crashes into China. Florence is just the latest in a long series of catastrophic events generated by stalled weather patterns — slow-moving systems which occur when one of the jet streams that flow around the Earth pinches off a massive section of air from normal wind flows for a prolonged period of time. The National Oceanic and Atmospheric Administration (NOAA) has compiled a long list of severe weather events in the US, and most of them are linked, in one way or another…