Southerly low-level jet in the winter cyclones of the southwestern Great Plains.

Abstract

On the basis of 20 cases in the winter half year, it is found that a southerly low-level jet (LLJ) is regularly associated with extratropical cyclones in the southwestern Great Plains. Only very weak and short-lived lows are not associated with an LLJ. A composite model is constructed that shows the typical sequence of events during the formation of the LLJ in the Texas-Colorado area.-from Authors