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<br />1971-72 Change effective <br />I October 1971 <br /> <br />1972-73 Change Effective <br />8 November 1972 <br /> <br />1973-75 No Change <br /> <br />B) Criterion #2 <br />1970-71 Original <br /> <br />Change Effective <br />17 April 1971 <br /> <br />1971-72 Change Effective <br />1 October 1971 <br /> <br />Change Effective <br />21 January 1972 <br /> <br />Precipitation of 0.01 inch or greater is <br />forecast for one or more of the following <br />gages :in the project areas during the 1100 <br />MST to 1100 MST period when Criteria 2 <br />and 3 (below) are met: <br /> <br />a) NP'-3 Castle Creek <br />b) KO-3 Wolf Creek <br />c) KH--I Lemon Park <br /> <br />Same as 1971-72 season except two more <br />gages were added: <br /> <br />d) JK.'1 -- Northfork Sand Creek <br />e) MO-] -- Nipple Mountain 2W <br /> <br />500 mb temperature of -230C or warmer is <br />forecast to exist over the project area for at <br />least 12 hours during the 1100 MST to 1100 <br />MST period. Cloud-top temperature, or, in <br />absence of this datum, 500 mb temperature <br />of -230 C or warmer is forecast to exist over <br />the project areas for at least 12 hours during <br />the 1100 MST to 1199 MST period. <br /> <br />Cloud-top temperature, or, in absence of <br />this datum, 500 mb temperature of -230C <br />or warmer is forecast to exist over the pro- <br />ject areas for at least 3 hours during the <br />1100 MST to 1100 MST period (Cloud-top <br />temperature referred to the temperature <br />of the highest cloud, including cirrus. ) <br />(The operational criterion of cloud-top temp- <br />erature was changed to apply only to the <br />lower precipitation-producing cloud mass.) <br /> <br />2-3 <br />