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Last modified
7/28/2009 2:32:39 PM
Creation date
1/8/2008 12:16:50 PM
Metadata
Fields
Template:
Weather Modification
Applicant
Thompson, J.R., G.W. Wilderson, and D.A. Griffith, North American Weather Consultants
Sponsor Name
USBR
Title
Cloud Seeding Data Collection, and Analysis Assoc. with the Colo River Augmentation Demonstration Program
Prepared For
USBR, Divison of Atmospheric Research
Prepared By
Thompson, Wilderson, Griffith
Date
12/1/1987
State
AZ
Weather Modification - Doc Type
Scientific Study
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<br />I <br />I <br />I <br />I <br />I <br />'I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />1987). Exceptions to this were those times when it was down <br />during maintenance or the approximately weekly "tipping curve" <br />calibrations. This method provides updates of some of the <br />coefficients used in the computer software that can change <br />due to gradual shifts in atmospheric characteristics and electronic <br />component drift. Tipping curves can only be made in cloud-free <br />or totally ice-cloud conditions. <br /> <br />2.4.3 . <br /> <br />C-band Radar <br /> <br />A C-band (5.4 cm wavelength) radar, owned by the Bureau <br />of Reclamation, was operated at the Happy Jack site from mid-- <br />January through March 17, 1987. It arrived with the microwave <br />radiometer and was installed in about the same time frame. <br />Its primary purpose was to monitor cloud base and top altitudes <br />and the structure of the latter (stratiform, convective). <br />The system, known as the swa-86 Skywater radar, uses a micro- <br />processor for scan control. It transmits 250 KW peak power <br />and has a one degree beam width. Data are digitized and written <br />on 9 track magnetic tape for later analysis. <br /> <br />Except for infrequent periods when the radar operated <br />in the PPI (Plan Position Indicator) mode, scanning to ascertain <br />the aerial distribution of precipitation, the radar was operated <br />in the RHI (Range Height Indicator) mode, making one slow <br />sweep per 5 minutes. This provided data for cloud top and <br />base determination. Such radar information is normally provided <br />by pointing the antenna vertically. However, noise in the <br />first few kilometers from the SWR-86 radar required that RHI <br />scanning be used. <br /> <br />2-12 <br />
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