TOKYO, Feb 7 (Reuters) - The popularity of Japan's crisp powder snow among foreign skiers, surging back into the country, is luring more to seek the thrill of pristine backcountry slopes - sometimes with deadly impact. Japan's snow, prized among skiers for dryness caused by local atmospheric conditions, is a big draw. The head of Japan's National Governors Association last week said a national system of safety measures is now essential. BACKCOUNTRY CULTUREThe reputation of Japanese snow took off after the Nagano Olympics. Japan wants to welcome foreign skiers, but they need to know the reality of the risks involved, said Kenji Kubota, a researcher with the Japan Rescue Organization.

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