Nowcasting Thermodynamic Profiles Using a Triangle of Wind Profilers in an Advection Model.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
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An experiment has been devised which tests the utility of three 50 MHz wind profilers data as a complement to the twice daily rawinsonde observation network. The goal was to determine if, by use of the profiler data in an advection model, one can predict the thermodynamic sounding during the twelve hour period between standard rawinsonde observations. Using the thermodynamic, moisture and continuity equations, local tendencies are obtained at each gridpoint. Each hour, the velocity fields are reanalyzed using the new profiler winds. Thermodynamic and wind soundings extracted from the gridded data are verified against the supplemental soundings. Results indicate that despite being limited by the availability of profiler winds, the simple advection model design and the effects of deep convection, the model produced soundings are an improvement over both persistance and initial soundings modified with surface data. Many enhancements are identified which can upgrade the quality and quantity of the profiler data as well as the advection model results.