Abstract
A short review of research trends in the study of low-frequency mid-latitude variations is presented. Theoretical developments have been concentrated upon with the major themes of multiple equilibria, flow stability and eddy-mean flow interaction reflecting the authors main interests. A new interpretation of the role of transient eddies in maintaining atmospheric blocking is also suggested in which eddy potential vorticity fluxes are considered to mediate a downstream transition between a zonal and a steady free Rossby wave flow. This treatment avoids emphasizing local balances and fluxes by the transients which are often entirely or partially reversible. The consequences of this interpretation are explored in the barotropic model of blocking first presented by Shutts (1983). This interpretation is used to suggest conditions in which the jetstream may be unlikely to undergo transition to a blocked weather regime.
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