Mesoscale Simulation of a Convective Frontal Passage Travis Swaggerty, Dorothea Ivanova and Melanie Wetzel Department of Applied Aviation Sciences Embry-Riddle.

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Presentation transcript:

Mesoscale Simulation of a Convective Frontal Passage Travis Swaggerty, Dorothea Ivanova and Melanie Wetzel Department of Applied Aviation Sciences Embry-Riddle Aeronautical University, Prescott, Arizona

Objective To more accurately predict convective frontal passages for… Aviation Emergency Response Demonstrate the use of Aircraft Data Verification Model Simulation Accuracy University of Wyoming King Air B200T (UWKA). Application to Emergency Response Aviation.King Air on-board computer systems and instrument racks.

Case Study for April 2 – 3, 2014 KFSX Radar reflectivity (dBZ) at 2130 Z. GOES Satellite Visible Image showing radar scan area and WRF model inner nest (domain 3). Topography within model Domain 2 and inset of domain 3.

Mesoscale Dynamic Influences on Temperature Aircraft altitude and temperature time series WRF domain 3 topography. Red Line indicated flight leg between two transects WRF forecast 500mb temperature, wind and geopotential height Aircraft flight track with parallel transects

Cloud Structure and Icing Applications Model distribution of Total Cloud Mixing Ratio (g kg -1 ) for 00 Z at 700mb. Time series (21 Z 02 April – 01 Z 3 April) for Rosemount Icing Detector (trips, red) and liquid water content (g m -3 ) along aircraft track. WRF forecast vertical cross section of cloud mixing ratio (g kg -1 ), temperature (˚C) and horizontal winds at 00Z on April 3, 2014

Forecasting Precipitation Distribution Model Domain 3 simulated reflectivity. Red line is UWKA transect beginning 2245 Z. Cross-section of precipitation mixing ratio along transect in Domain 3. Aircraft vertical profile of cloud/precipitation mass concentration.

Verification of Wind Patterns NCEP forecast Cross-section NCEP forecast meteogram WRF forecast of 600mb temperature, wind & geopotential height WRF simulated sounding Aircraft vertical profile of wind speed and direction along flight transects Radiosonde launched at Embry-Riddle Campus

Conclusions Aircraft measurements of cloud mass mixing ratio correspond to distribution indicated in model domain 3 (3km resolution). Model vertical profile of supercooled cloud structure matches convective distribution observed along sampling transects. Radiosonde and aircraft profiles of wind velocity agree with simulation of wind patterns. Mesoscale dynamics associated with Mogollon Rim are represented in forecast results. Model produced reliable simulations of icing conditions.