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<br />Change Eff ec tiv e <br />22 December 1971 <br /> <br />storms were declared out of operational <br />limits by the mean-wind criteria when the <br />700 mb wind was from the southwest al- <br />though winds in the lower levels were east <br />to southeast, a new procedure was pro- <br />posed. The new procedure bacame effect- <br />ive 22 December 1971 as stated below. ) <br />The representative wind flow usually 700 mb, <br />is forecast to be toward the mountain slopes <br />of the project areas (approximately 1700 <br />through 3000) during the 3-hour or greater <br />period when the Cloud-top temperature or, <br />in the absence of this datum, 500 mb temp- <br />erature is -230C or warmer. (The repre- <br />sentative wind flow was determined by aver- <br />aging the 9,000 through 11, OOO-feet winds <br />for direction and speed. A plot of the tra- <br />jectory of the winds from the surface to <br />10,000 feet was used to determine the lat- <br />eral offset distance of the center of the <br />plume, between the surface wource and the <br />height of the representative wind flow near <br />700 mb.) <br /> <br />1972-73 Change in Wording <br />1972-73 Change in Wording <br /> <br />Added _80 to -230C to the end of the state- <br />ment to reflect changes made in the first <br />and second criterion. <br /> <br />1973-75 No change <br />2.3 OPERATIONAL SEEDING PLAN <br />Once an experimental day meeting the above criteria was forecast and <br />determined by the randomization to be a seed day, the area was seeded using <br />a variable seeding rate as based on the Climax model. The initial seeding rate <br />was determined by the forecast cloud-top temperature or 500 mb forecast tem- <br />perature according to the following criteria: <br /> <br />2-5 <br />