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<br />32 PARK RANGE ATMOSPHERIC WATER RESOURCES PROGRAM
<br /> Table 4.-Analysis Periods.
<br /> 700 mb.
<br /> Wind group assignment
<br />A.P. Date Start Stop 30' !::,. Class Speed m.p.h.
<br />1 February 5, . . . . . . . . . , . . . 2200 1100 2/6 21-2-1 20
<br />2 February 7. . . . . , . . . . , . . , 0000 1100 0-3 10
<br />3 February 10,........,." 1200 0600 2/11 12-15 10
<br />4 February 14, . . . . . . , . , . . . 0000 0/00 2/15 2/-30 15
<br />5 February 22. , , . , , . , . , . . , 1200 0700 2/23 30-33 15
<br />6 February 24, . . . . . . , , . . . . 2100 2/23 10002/24 30-33 20
<br />7 February 27 . . . . . , . . . . . , . 1500 07002/28 2/-:~0 25
<br />8 February 28. . . . , . . . . . , . . 0700 09003/1 30-33 20
<br />9 March 9. , . . . . . . , , . . . . . . . 1600 06003/10 2/-30 10
<br />10 March 13. . , . . . . . . , , . , . . . 14003/12 1500 3/13 24-2/ 10
<br />11 .March 14. ,.. ,. . . , . . . . , . , . 1500 3/13 0800 3/15 2/-30 15
<br />12 March 16. . . , , . , . . . . . . , . . 2000 08003/1/ 27-30 20
<br />13 March 18..... . . . . . . . . " . 14003/17 06003/18 2/-30 20
<br />14 March 21. . . , . . . , . , , . , . . , 2000 3/20 1300 3/21 2/-30 25
<br />15 March'22.......,..,.,.. . 1400 13003/23 27-30 15
<br />16 March 24. . . . , . . , . . , . . . . , 17003/23 0400 3/25 27-30 15
<br />17 March 27. . . . . . . . . . '.' . . . , 18003/25 1000 3/28 2/-30 15
<br />18 April 5. . . , , . . . . . . . . . . . . . 1200 0300 4/6 27-30 10
<br />19 April 7, , . . . . . . . . . . . . . . , . 1400 0400 4/8 24-2/ 15
<br />20 April 9, . . . . . . . . . . . . . . . . . 0400 .04004/10 21-24 25
<br />'21 April 10, . . . . . . . . . . . . . , . , 1200 0800 4/11 21-24 15
<br />22 April 12. . . . . . . .. , . . . . . , . 1800 0500 4/13 15-18 20
<br />23 April 17. . . . . . . . . . , , . . . . . 2000 0800 4/18 27~30 15
<br />24 April 23.. .: . . . . . . . ,. . . . , 1500 0100 4/24 18-21 15
<br />25 April 25, , . . . , . , . . . . . . , . . 2300 09004/26 6-9 15
<br />'26 Ap'ril 26.. . . . . . . .. .. .. .. . 1200 0800 4/27 6-9 15
<br />
<br />did artificial freezing nuclei participate in precipitation
<br />formation and in what proportion to natural 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 been necessary to attempt answers to these ques-
<br />tions by means of data having a very low "signal-to-
<br />noise" ratio (8 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 desilre answers
<br />that have a high 8 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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