Abstract
Abstract Dynamical methods are used to investigate atmospheric teleconnections associated with extreme seasonal precipitation anomalies over the central United States during April–June. The importance of sea surface temperature (SST) anomalies in forcing atmospheric teleconnections is specifically addressed through analyses of atmospheric general circulation model (GCM) simulations forced with the monthly varying SSTs of the years 1950–98. The results from three different models, each run in ensemble mode, are compared with observations of extreme April–June precipitation events in the central United States during the last half of the twentieth century. Analysis of GCM simulations of April–June 1988 indicates that the atmospheric circulation anomalies associated with the 1988 drought were not forced by SST anomalies and that the coexistence of central U.S. drought and La Nina during that spring was coincidental. Likewise, composite analysis reveals no SST forcing for the teleconnections associated with ex...
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