TAIPEI (Reuters) - Taiwan has issued a warning to residents of its southern and eastern regions as powerful typhoon Nanmadol approaches after hitting the northern Philippines. Nanmadol caused flooding and landslides and knocked out power in northern areas of the Philippines, but was weakening as it approached Taiwan. Taiwan's central weather bureau said the typhoon, with winds of 45 meters per second, is slow moving. The bureau warned of landslides and flooding in mountain areas and of strong winds.