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<br />* <br /> <br />- 86 - <br /> <br />Instead the lower air was given a critical wave number which would enable it <br />to flow over the mountain. It can be seen that the end points of the <br />trajectories have been shifted upwind and the precipitation rate has <br />increased. Although this is rather a crude test of. the effect of blocking, <br />it does indicate that the blocking should not be ignored. The abrupt changes <br />in the trajectory for a concentration of 25 ice particl.es perliteI' near the <br />point x = -35.km occur because the conqitions change from non-glaciated to <br />glaciated for a short period of time, back to non-glaciated due to ,strong <br />uplift, and then return to glaciated. <br />Fig. 3.7 shows a simulated blocking run for a southwest wind. The <br />primary difference between this case and that for a west wind can be seen at <br />-1 <br />crystal concentration of 1001 . The trajectory has been lengthened to the <br />point that the ice particles are carried over the Cascade, Divide and well <br />downwind to reach the ground at about x = +30 km. Due to the mountains in this <br />area and the enhanced lift which they produce, the ice particles undergo <br />renewed growth and the precipitation rate again increases. This prediction <br />might be difficult to verify in the field because of the rugged terrain of <br />the Cascade Mountains and long trajectories of the ice particles. However, <br />it is an interesting possibility that one of the best ways to increase <br />precipitation on the east side of the divide might be to capitalize on the <br />rise in terrain east of the Cascade Divide in this fashion. <br />The previous figures showed the res~lts ofa few sample trajectories. The <br />subsequent figures show the results of a composite of many trajectories. <br />Figs. 3.8 and 3.9 show the results of increasing the ice particle <br />concentration beyond It-I. The ~esults are therefore normalized to this <br /> <br />L <br />L <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />l <br />l <br />1 <br />l <br />I <br />L <br />