Drought has left parts of Wyoming's Greybull River Valley and its farmers without their usual sugar beets, beans, barley, and corn. Now, some farmers have decided not to plant these crops at all. For farms that rely on snowmelt and water stored in reservoirs, the central question this season is how much will still be available by late summer. What's happening? With nearly all of Wyoming now in drought and parts of Big Horn County rated severe to…