Boundary layer control of nocturnal convection associated with a synoptic scale system.

Abstract

A case is presented with pronounced diurnal variations in precipitation and low-level circulations over the Great Plains during 5-10 May 1979. Well-defined nocturnal convection, along with distinct maximum precipitation events in Nebraska, was associated with strong diurnal wind oscillations at 850 mb in Oklahoma, Kansas and Missouri. The LFM-II operational model did not predict these phenomena even though hourly precipitation frequencies at midnight were five times as numerous as in the afternoon in Nebraska. -from Authors