Heat Island Convergence in St. Louis during Calm Periods

Abstract

From Regional Air Monitoring System (RAMS) tower data recorded in St. Louis during 1976, time series of convergence, heat island intensity and solar radiation are presented for five calm periods each exceeding 12 h. The records demonstrate that heat-island-induced convergence is markedly stronger during the day than at night. There are indications of a periodicity of 1.5-2 h in the nighttime convergence, while the daytime convergence is more variable and cannot be characterized as periodic. An event recorded by one series is interpreted as storm cell development associated with the daytime convergence.