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<br />32
<br />
<br />Table 4.-Analysis Periods.
<br />
<br />PARK RANGE ATMOSPHERIC WATER RESOURCES PROGRAM
<br />
<br /> 700 mb.
<br /> Wind group assignment
<br />A.P. Date Start Stop 300 L. Class Speed m,p.h.
<br />1 February 5 , ' , , ' , , . , , , , , , 2200 1100 2/6 21-2.Jc 20
<br />2 February 7 , , , , , , , , , , , , , , 0000 1100 0-3 10
<br />3 February 10, , , , . , , , , , , , ' 1200 06002/11 12-15 10
<br />4 February 14, , , , , , , , , , , , , 0000 07002/15 27-30 ]5
<br />5 February 22 , ' ,... . ..... . 1200 07002/23 3(H13 ]5
<br />6 February 24, , , , , , , ' , , , , , 21002/23 1000 2/24 :30-:33 20
<br />7 February 27, , , , , , , , ' , ' , , 1500 0700 2/28 27-;jO 25
<br />8 February 28, , , , , , , , ' , , , , 0700 0\)00 3/1 :30-:j:3 20
<br />\) March 9, , , , , ' , , , , , , , , ' , , 1600 06003/]0 27-:30 10
<br />10 March 13, , ' , ' , , , , , , ' , ' , . 14003/12 15003/1:3 24-27 10
<br />11 March 14, , , , , , ' , ' . , , ... . 15003/13 0800 :3/]5 27-:30 15
<br />12 March 16"""""", " , 2000 0800 3/] 7 27-30 20
<br />13 March 18, , , , , ' , , , , , , , 14003/17 06003/18 27-:30 20
<br />14 March 21. , , ' , , , , , , , ' ... . 2000 3/20 1300 :3/21 27-:30 25
<br />15 Mareh 22, ' , , , ' , , , , , , , , , ' 1400 1300 3/2:3 27-30 15
<br />16 March 24, , ' , , , , , , , , , , ' , ' 17003/23 0400 3/25 27-30 15
<br />]7 March 27, , , , , , , ' , , , , , , , , ]800 :3/25 1000 :3/28 27-:30 ]5
<br />18 April 5""""".""", 1200 0300 4/6 27-:30 10
<br />19 April 7""""""""" 1400 O.JcOO 4/8 2.Jc-27 15
<br />20 April \)""",."",."" 0400 04004/10 21-2.Jc 25
<br />21 April 10, , ' , , , , " ....... . 1200 08004/11 21-24 15
<br />22 ' April 12, , , , , , , , , , , , ' , , , , 1800 05004/13 15-]8 20
<br />23 April 17, , , , , , , , ' , , ' . , , , , 2000 08004/]8 27-30 15
<br />24 April 23, , , , , , , , , , , ' , , , , , 1500 0100 4/24 18-21 15
<br />25 April 25, , , , . , : , , , , , , , , , , 2300 0900 4/26 6-\) 15
<br />26 April 26.. , , . , , , ' , , , , , , , , 1200 0800 4/27 6-\) 15
<br />
<br />did artificial freezing nuclei participate in preCIpItation
<br />formation and in what proportion to natura] nuclei?, and
<br />did the influence of artificial nuclei in snowcrystal forma-
<br />tion alter natural storm characteristics-that is. was there
<br />significant "weather modification?"
<br />
<br />In past precipitation augmentation programs, it
<br />has be,en necessary to attempt answers to these ques-
<br />tions by means of data having a very low "signal-to-
<br />noise" ratio (5 IN). Rather complicated analysis
<br />procedures have been used to try to isolate what
<br />was assumed to be a small signal in a lot of noise.
<br />From an engineering standpoint, we desire answers
<br />that have a high S IN ratio so that only the magni-
<br />tude-not the reality-of the answer requires testing
<br />over a season or so. It appears that this approach is
<br />now technically' feasible; in the following para-
<br />graphs, we demonstrate how each question can be
<br />answered based' on an analysis of Phase I results.
<br />
<br />Will Artificial Freezing Nuclei
<br />Reach the Target?
<br />Method.-Under typical storm conditions, release
<br />ZnS tracer material-so as not to contaminate the
<br />target- and track the plume from the air and on the
<br />ground. Determine plume dimensions and orienta-
<br />tion as a function of wind and stability. Repeat
<br />tests under extreme wind and stability conditions
<br />to determine operational boundaries.
<br />Data.-Seven diffusion tests in the Steamboat
<br />Springs area between February and April 1965.
<br />Precipitation, wind, temperature and' particle de-
<br />tection data for period February-May 1965.
<br />Analysis.- The tests produced the results plotted
<br />in the plume and pibal figures 43a, 43b, 43c, 43d,
<br />43e, 43f, and 43g. Flights on 22 February, 25 March
<br />and 8 April 1965 were conducted under nearly op-
<br />erational nucleating conditions and produced a
<br />plume width equal to or greater than one radian
<br />
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