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Mountain rescue teams train volunteers to read shifting weather patterns before a search party ever leaves the —valleyvalleysvalley'svale. Because a casualty's exact location is rarely —certaincertainlycertaintycertainties, rescuers must combine mapping software with the slower, methodical work of searching gullies on —footfeetfootingfooted. Helicopters speed up evacuation, but low cloud can ground them entirely, leaving teams to —proceedprocessionproceedingproceeds on foot regardless of terrain.