Accession Number : ADA018056

Title :   Research at the McGill Radar Weather Observatory.

Descriptive Note : Final rept. 1 Sep 72-31 Aug 75,

Corporate Author : MCGILL UNIV MONTREAL (QUEBEC) STORMY WEATHER GROUP

Personal Author(s) : Marshall,J. Stewart

Report Date : 21 SEP 1975

Pagination or Media Count : 58

Abstract : The McGill Weather Radar provides precipitation intensity values (15 intervals) for 1,300,000 data sites located at ranges 10 to 400 km, heights 1 to 16 km, every 5 minutes. The standard deviation on the record of the target intensity level is 3 dBZ (to be decreased to 2 dBZ) and the limits of spatial resolution are: cross-range - 0.02 x range; in range - 0.03 x range (min. 1.125 km); and in height - (0.015 x range) + (0.15 x height). We propose to double the number of data sites in order to improve the resolution in range to equal that cross-range. A PDP-11 computer is used to log the data on digital magnetic tape and to analyze it. In addition to statistical analyses, numerical maps and sections can be generated. Among the maps are constant-altitude PPI's and constant-altitude AZLOR's. The latter use the original data sites to provide best resolution on a conformal map. The radar records are being used currently for research in hydrology (agricultural and flood-related), radar forecasting, microwave attenuation by rain as it affects communications, and in relating radio-located lightning discharges to thunderstorm structure. (Author)

Descriptors :   *Meteorological radar, Weather, Meteorology, Hydrology, Thunderstorms, Lightning, Rainfall, Mapping, Attenuation, Digital computers, Magnetic tape, Minicomputers, Plan position indicators, Azimuth, Communication equipment

Subject Categories : Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE