Huaqing Cai NCAR/ASP/ATD Wen-Chau Lee Tammy M. Weckwerth NCAR/ATD

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Huaqing Cai NCAR/ASP/ATD Wen-Chau Lee Tammy M. Weckwerth NCAR/ATD Observations of 11 June Dryline During IHOP -- A Null Case for Convection Initiation Huaqing Cai NCAR/ASP/ATD Wen-Chau Lee Tammy M. Weckwerth NCAR/ATD

LAPS 12km MM5 LAPS 4km MM5

S-Pol Reflectivity & Refractivity

NRL-P3 Flight Level Data Along the Dryline

ELDORA Analysis

NRL-P3 Flight Level Data Across the Dryline

Dryline, Roll Boundary and Dropsonde Positions

Learjet Dropsondes

NCAR-NCEP Reanalysis

Summary of Factors Detrimental to CI on 11 June Case A relatively weak updraft (1-2 m/s) and an overall dry boundary layer (40% relative humidity) A substantial dry layer 200 mb deep directly above the CBL Relatively strong shear between boundary layer and middle level winds (~15 m/s)

Summary of Factors Detrimental to CI on 11 June Case (cont’d) Middle level subsidence over the dryline in the Oklahoma panhandle region Not very favorable instability near the dryline