pure and applied geophysics

, Volume 120, Issue 2, pp 273–285 | Cite as

Areal extent and vertical structure of radar weather echoes at Montreal

  • R. R. Rogers
  • M. K. Yau


A large sample of radar data from the period May–August 1976 was analyzed to provide information on the total areal coverage of precipitation echoes at 1-km steps in altitude ranging from 2 km up to 10 km. A transformation based on known statistics of surface rainfall rate was employed to express this information in terms of the probability of certain reflectivities being exceeded at a randomly chosen point at a given altitude. The same data base was used to construct a family of average vertical profiles of precipitation reflectivity. The profiles were conditioned by the reflectivity value at the lowest level (2 km), thus providing a basis for estimating the reflectivity aloft, given the low level or surface rainfall rate. Analyses of this kind have been reported for other geographical locations and for a variety of applications, such as hydrology, rain effects on earth-space radio propagation, and precipitation modeling. Similarities in the results from these two quite different analysis procedures, possibly not hitherto recognized, were found in the present study.

Key words

Radar weather echoes Reflectivity profiles of rain Rainfall statistics 


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Copyright information

© Birkhäuser Verlag 1982

Authors and Affiliations

  • R. R. Rogers
  • M. K. Yau
    • 1
  1. 1.Department of MeterologyMcGill UniversityMontrealCanada

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