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<br />(7) cloud droplet, ice crystal, and raindrop size spectra <br />and concentration; and (8) concentrations of seeding <br />materials at cloud base and within clouds. <br /> <br />Use of models adapted to a time-share computer accessed by <br />telephone through portable terminals offers a readily <br />available operational means of scientifically directing <br />cloud seeding. Model simplification will be oriented <br />toward field operational use through the Bureau's time- <br />share Environmental Data Network. More complex models, <br />utilizing sophisticated input, will be developed for <br />research use in larger computers to define and analyze in <br />detail the cumulus seeding interactions as well as research <br />on upslope, winter, frontal, and cyclonic weather modifica- <br />tion potentials. <br /> <br />Three modeling developments that are most needed for early <br />improved operations in the High Plains are: <br />1. Simplified models for field operations that inte" <br />grate minimal input, have efficient internal sub- <br />routine programing, and give readily understandable <br />outputs <br />2. Improved research models capable of describing and <br />evaluating two unresolved cumulus problems - complex <br />intercloud and downwind reactions and clouds with <br />significant wind shear <br /> <br />22 <br />