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<br />CONTENTS <br /> <br />Section <br /> <br />Page <br /> <br />1. Introduction .. ... ...... ..... ..... ..."...." ..... ..... .....".. ............ ... ..... .... ..... ........ .......".. II 1 <br /> <br />1.1 Choice of Grand Mesa experimental area........... .................. .............. ". ........ .......... ..1 <br />1.2 Goals of winter field programs........ .................................. ......... ....................... ... ......1 <br /> <br />1.3 First winter season.. ............ .................. ........ .............................. ... ...................... ... ....1 <br /> <br />1.4 Second winter season .... ............. ................ .................................... ............................2 <br /> <br />1.5 Third winter season...... ....... ..... .......... ............................... ..... ............. .................. .....2 <br /> <br />1.6 Analyses..................................................................................................................... .4 <br /> <br />2. Supercooled liquid water investigations ................................................... 5 <br /> <br />2.1 Introduction.................................................................................................................5 <br /> <br />2.2 Instrumentation.............. ................................................................... ...... ....................5 <br /> <br />2.3 Meteorological conditions that produce SL W................ ..... .......... ..... .... .................. ...5 <br />2.4 Spatial distribution of SL W ............... ..... .................... ... .................................. ....... ....7 <br /> <br />2.4.1 Aircraft measurements. ................................... ... ... ... ................. .................... ..........7 <br /> <br />2.4.2 Radar measurements............ ........ ... ................ ...... .............. ......... ..........................9 <br /> <br />2.5 Temporal distribution of SL W ....................................... ............ .............. ................ ...10 <br />2.5.1 Distribution of SL W amounts..................................... .................... ........ ............... .10 <br />2.5.2 Distribution of SL W episodes............... ................... ...... ....................... .............. ... .11 <br /> <br />2.5.3 Rosemount icing rate meter................................... ...... '" ....................... .............. ...11 <br /> <br />2.6 Discussion........... ....... ...................... .......... .................... ......... ... ................. ... ............ .13 <br /> <br />3. Precipitation Investigations ..... ..... .........".... ....... ..........." ........"...... D........".. 15 <br /> <br />3.1 Precipitation gauge networks.......................................... .................... ............ ..,..... ... .15 <br />3.2 Precipitation characteristics atop Grand Mesa... .......... ...................................... ..... ...16 <br />3.3 Meteorological factors associated with precipitation................................................. .18 <br />3.4 Comparisons between precipitation measuring systems .............................................19 <br /> <br />3.4.1 Collocated measurements................. ....... .............................................................. .19 <br /> <br />3.4.2 Variations within a clearing...... .............. ....................................... ........................ .19 <br />3.4.3 Variations between types of equipment........ ........ ......................... ................. ..... ...20 <br /> <br />3.4.4 Variations between sites.................................. ............................ ........,................ ..21 <br /> <br />3.5 Summary..... ...................... ............. .............................................. ............"................. .22 <br /> <br />4. Ice particle Investigations ........................................................~................ 23 <br /> <br />4.1 Aircraft and ground-based ice particle observation systems........................................23 <br />4.2 General ice particle characteristics ....................... ......................................................23 <br />4.3 Case studies of December 12, 1983, orographic clouds ............................................24 <br />4.4 Case study of December 1, 1983, "notch cloud" ..................................."..................25 <br /> <br />4.5 Other characteristics.................................................... ....................... ..... ................... .25 <br /> <br />iii <br />