H. van Loon Atlas of Point Correlations and D. J. Shea National Center for at 30 mb and between Atmospheric Research,* Boulder, Colorado 500 and 30 mb 1. Introduction often ends in December, which therefore is—on an average—the coldest month at these latitudes. The National Centerfor Atmospheric Research has b) Major midwinter warmings, during which the issued a technical note (Shea et al. 1992) with point polar low is replaced by a high, nearly all occur in correlations (teleconnections) on the 30-mb surface January—February. and between 500 and 30 mb. The correlations are for c) The final (spring) warming of the lower strato- the two-month means January-February, March-April, sphere takes place in March-April. July-August, and November-December, which were The correlations are based on two well-known chosen because of these characteristics of the datasets: 1) the monthly mean temperatures and intraseasonal change in the stratosphere: geopotential heights at 30 mb, derived from the daily a) At 30 mb the annual cooling at higher latitudes historical maps from the Stratospheric Research Group, Freie Universitaet, Berlin; and 2) the monthly mean geopotential heights at 500 mb from the National Meteorologi- cal Center, Washington, D.C. The 500- and 30-mb heights span the years
Bulletin of the American Meteorological Society – American Meteorological Society
Published: Dec 1, 1992
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