The tropical heating and transient activity features during the period of t
he persistent anomaly of summertime circulation over the Ural Mountains are
studied, and a possible mechanism responsible for formation and maintenanc
e of persistent anomalies is proposed. The mechanism can be summarized as a
kind of self-sustaining through a two-way interaction of stationary wave w
ith transient eddies under the consistent forcing of abnormal heating in th
e tropics.