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TABLE OF CONTENTS <br /> Page <br />EXECUTIVE SUMMARY 4 <br />1.0 OVERVIEW 13 <br />2.0 A RECENT HISTORY OF CLOUD SEEDING RESEARCH IN TEXAS 13 <br /> 2.1 Completion of SPECTRA Research Effort 14 <br /> 2.2 SPECTRA II 14 <br />3.0 SCIENTIFIC BASIS FOR HYGROSCOPIC SALT SEEDING 14 <br />4.0 WHAT WAS PLANNED FOR THE SPECTRA II EXPERIMENT 15 <br /> 3.1 Goals and Objectives 16 <br /> 3.2 Resources 15 <br /> 3.3 Timing and Location of Experiments 17 <br /> 3.4 Key Personnel 17 <br /> 3.5 Planned Scenario for a Typical Operational Day 18 <br /> 3.6 Other Considerations 18 <br /> 3.6.1 Suspension criteria 18 <br /> 3.6.2 Public relations 19 <br />5.0 SUMMARY OF WHAT ACTUALLY HAPPENED IN SPECTRA II 19 <br /> 4.1 What Was Planned but Did Not Happen 23 <br /> 4.2 SPECTRA II Events that Were Not Planned 23 <br />6.0 THE WEATHER DURING SPECTRA II 25 <br />7.0 SUMMARY OF SIGNIFICANT EVENTS DURING SPECTRA II 31 <br />8.0 RESULTS OF ANALYSES 32 <br /> 8.1 Results for May 14, 2005 32 <br /> 8.2 Results for May 25, 2005 37 <br /> 8.3 Results for May 31, 2005 40 <br /> 8.4 Summary and Conclusions 49 <br />9.0 THE SPECTRA II MODELING EFFORT <br /> 9.1 Introduction 51 <br /> 9.2 The Numerical Model 52 <br /> 9.3 Mechanisms for Rain Enhancement by Hygroscopic Seeding 54 <br /> 9.4 Design of the Numerical Experiments with Hygroscopic Seeding 56 <br /> 9.5 Results of Simulations 58 <br /> 9.5.1 General characteristics of non-seeded clouds 58 <br /> 9.5.2 Results of seeding simulations with salt powder 60 <br /> 9.5.3 Results of seeding with hygroscopic flares 63 <br /> 9.6 Discussion 65 <br />2 <br />