A monster wave of warm water close to 14,500 km across is crossing the Pacific, tracked by Nasa's Sentinel-6 satellite. Noaa has declared El Nino, with a 63 per cent chance it turns very strong by winter. Somewhere beneath the Pacific Ocean, a vast pulse of warm water is on the move. It began near Indonesia and has been sliding east along the equator for months, a slow, invisible surge of heat that some scientists have described as stretching close to... [2594 chars]
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