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FIGURE F.-Detailed precipitation patterns in the Elko area.

WEATHER MODIFICATION

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In reviewing these photographs it should be realized that they represent a first attempt at such photography, in which changes were made in both exposure time and scale factors used. For this reason the scale factor and exposure of the various photographs are not uniform. Figures A and B show the radar output to a range of about 120 miles. In figure A, MTI is utilized to a range of 50 miles. Some precipitation within the 50-mile circle is discernible. Beyond 50 miles the heavy ground clutter makes the detection of precipitation rather difficult.

In figure B, MTI is utilized to the edge of the presentation and so the precipitation is readily discernible at all ranges.

The video map of figure B presents the exact location of precipitation to be readily identified, by using the airways chart of figure C.

Figures D, E, and F show the precipitation in the Elko area in more detail. Again the location of the precipitation can be obtained by reference to the video map which shows the location of the Carlin fan marker and the Elko and Wells radio.

Figure G shows the location of the Elko target areas with respect to the terrain under discussion.

As additional photographs of interest become available they will be presented. Work plan D. Study the physics and dynamics of orographic and convective cloud systems

(1) Several tetroon runs to study the airflow patterns over the Mount Rose area have been made during this report period. The data was reduced and one track is presented below.

(2) Three aircraft flights, in conjunction with ground radar tracking, and ground radar observations of precipitation have been made during this period.

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