WMOD00400

• Contract/Permit #: 14-06-D-6801
• Title: Structure and Seedability of San Juan Storms
• Date: 11/1/1976
• Weather Modification - Doc Type: Report

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Section V is R detailed discussion of each case study. Cross-sections

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for each stann and each flight are presented and the dynamical and micro-

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physical aspects of each storm are discussed in some detail. In addition,

some points are made in these case studies \vhich, \vhile not important to our

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main conclusions, are nevertheless interesting as physical characteristics

of wintertime clouds.

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II. DATA USED IN STORH SYNTllES IS

A. Aircraft Flight Operations

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1. Operational periods

During the 1974-75 winter season there were 50 hours of flight time

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allocated to be used by the Wyoming Q/A to fly over the San Juans. The air-

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craft \'7as on call from 15 December to 30 March. The NCAR Q/ A was allocated

to the University of Wyoming during the two periods of 20 to 31 January and

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10 to 20 ~farch. Both aircraft were used in separate but similar programs -

the San Juan Project or the Elk Mountain Project, depending upon the weather.

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Table 2.1 contains a summary of the 1974-75 San Juan case studies. The

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SUITLlnary includes the period occupied by each storm, the flight times over the

San Juans for each aircraft, the stage of the storm (see section IlIA and B)

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during each flight and the times when Dr. Vardiman \,as taking data along Holf

Creek Pass.

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2. Air traffic control

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In order to obtain the necessary measurements of airflm" over the San

Juan Mountains and the physical characteristics of the cloud which forms over

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the mountains it \,]dS necessary to operate the research aircraft under control

of the FAA l\ir Route Traffic Control System. After discu~;sion with personnel

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at Denver Center (located ;)t Lonp,liIont, Co.lor<ldo) :it \vas decided to make

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