El Niño seen weak into Northern Hemisphere winter: CPC Thu Oct 4, 2012 11:12am EDT (Reuters) - The U.S. weather forecaster still expects the much-feared El Niño phenomenon, which can wreak havoc on global weather, to remain weak into the Northern Hemisphere winter, with only a possibility that it will strengthen over the next few months. In its monthly assessment, the U.S. Climate Prediction Center (CPC) said on Thursday it is still not clear whether a fully fledged El Niño would emerge after its development slowed recently. Reporting By Josephine Mason; Editing by Gerald E. McCormick