| Storm relative isentropic motion associated with cold fronts in north Utah - :14487 | National Weather Service (NWS)
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Storm relative isentropic motion associated with cold fronts in north Utah
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    One of the most difficult forecasting problems for Salt Lake City, Utah is the discrimination between wet and dry cold fronts as these weather systems move into the populated regions on the western slope of the Wasatch Mountains. The intent of this paper is to diagnose isentropic vertical motion associated with winter season cold frontal passages at Salt Lake City from a storm relative (Lagrangian) frame of reference in an attempt to discern wet from dry frontal passages. Lagrangian vertical motions associated with cold frontal passages are compared with conventional fixed frame of reference (Eulerian) isentropic motion. All wet frontal passages at Salt Lake City from November 1993 through January 1994 coincided with upward motion using the Lagrangian isentropic analysis scheme. Only 25 percent of the wet frontal systems were identified by upward motion using conventional Eulerian isentropic analysis. Modern computer technology allows forecasters to examine Lagrangian isentropic motion with PCGRIDDS software applications as was performed for this study.

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