WMOD00302

• Title: Lake Oroville Runoff Enhancement Prototype Program - Operations Plan - 1992-1993
• Date: 12/1/1992
• Weather Modification - Doc Type: Report

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NOAA will provide all data to the Bureau in final, calibrated
engineering unit computer compatible format.

The flight pattern to be used during research flights is shown in
4.1. The track labeled 8800 ft. is the ridge track. The track
labeled 8300 ft. is the valley track. All portions of the ridge
track are at least 5 statute miles upwind of the 7800 ft contour
around Mt. Ingalls (8377 ft), and further than that from any
higher terrain. All portions of the valley track are at least 5
statute miles downwind (for typical south-southwest winds) of the
7300 ft contour on the ridge from which seeding material and
tracer gas will be released. All terrain is less than 7300 ft
for more than 5 miles further downwind of the flight track.

The two SF6 release points are shown in Fig. 4.1. Typical
prevailing winds should transport the tracer to the north-
northwest. The flight tracks can be flown in either a racetrack
pattern or back-and-forth. Also, if the aircraft has flown out
of either the SF6 or ice crystal plume, it is requested that the
pilots break off the leg and begin sampling the plumes to
determine both the horizontal and vertical spread rates.

~

In addition to the minimum altitudes of 8300 ft and 8800ft,
respectively, passes should be made at higher altitudes, possibly
as high as just above cloud, in order to locate the tops of the
plumes. Several passes should be made downwind of the ridge track

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