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Getting a Handle on The North's 'El Niño'

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Science  19 Oct 2001:
Vol. 294, Issue 5542, pp. 494-495
DOI: 10.1126/science.294.5542.494b

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On page 581 of this issue of Science, meteorologists report that despite its reputation as a lightweight, the stratosphere at times reaches down through the troposphere to push Northern Hemisphere weather toward one extreme regime or the other for a couple of months at a time. That could give forecasters an edge in long-range predictions at middle and high latitudes comparable to that provided by El Niño at some latitudes.