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<br />1972-73 Change Effective <br />8 November 1972 <br /> <br />1973-74 Change Effective <br />11 October 1973 <br /> <br />1974-75 No Changes <br /> <br />C) Criterion #3 <br />1970-71 Original <br /> <br />1971-72 Change Effective <br />I October 1971 <br /> <br />Cloud-top temperature of -8 to -230C, or <br />in the absence of this data, 500 mb temp- <br />erature is forecast to exist over the pro- <br />ject areas for at least 3 hours during the <br />1100 MST to 1100 MST period. (Warm <br />limit temperature of _80 C was established <br />for inclusion in the cloud-top criteria be- <br />cause of concern that silver iodide was not <br />significantly effective as a nucleating agent <br />at temperatures warmer than _80 C. ) <br /> <br />500 mb temperature of -230 C or warmer is <br />forecast to exist over the proj ect areas. <br />(This change deleted the cloud-top temper- <br />ature range of -8 to -230C and returned it <br />to the original criteria of 500 mb temper- <br />ature of -23 Oc or warmer.) <br /> <br />" <br /> <br />~ <br /> <br />700 mb winds were forecast to be towards <br />the mountain slopes of the target area (1500 <br />through 3000) during the period of greater <br />than or equal to -230C temps at 500 mb. <br /> <br />Mean wind field from surface to 700 mb is <br />forecast to be toward the mountain slopes <br />of the project target areas (approximately <br />1700 through 3000) during the period when <br />the cloud-top temperature or the 500 mb <br />temperature is -230C or warmer. <br />(At the 28 September 1971 planning confer- <br />ence with the Bureau of Reclamation, this <br />change was proposed. However, after <br />experiences early in the season where two <br /> <br />:7 <br /> <br />2-4 <br />