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Heavy snow, rain and thunderstorms are poised to return to the flood-weary Central US late this week as a Rocky Mountain-based storm roars across the Central Plains and Mississippi River Valley. The Missouri and Mississippi Rivers are still above flood stage weeks after heavy rain, rapid snow melt, and impenetrable ice jams prompted the rivers to swell to record extents earlier this month. It will therefore not take much more rain to inundate many communities still recovering from the catastrophic flooding. The storm’s upper air support will actually originate over the Pacific Ocean. But the upper-area of low pressure will quickly run out of juice after dumping heavy rain and delivering yet another heavy snowfall to the Sierra-Nevada Mountains in California on Wednesday. The system will lose the influx of moisture from the subtropical Pacific as it progresses over the Great Basin Thursday. Its surface component will fizzle with a…