Accession Number:

ADA011454

Title:

A Relation Between Reflectivity and Mean Fall Speed in Hail.

Descriptive Note:

Interim rept.,

Corporate Author:

AIR FORCE CAMBRIDGE RESEARCH LABS HANSCOM AFB MASS

Personal Author(s):

Report Date:

1975-06-05

Pagination or Media Count:

3.0

Abstract:

Vertical winds in precipitation can be derived from the Doppler velocity spectrum by comparing V sub 0, the measured power-weighted mean vertical velocity, with w sub 0, the mean obtained from the reflectivity factor, Z sub e. In order to do this, the constants in the expression W sub 0 AZ sup b, sub e must be evaluated. This has been done previously by Rogers for rain, assuming Rayleigh scattering. In this paper, the formula is extended to the non-Rayleigh case of hail spectra. It is shown that b varies with wavelength, and that A depends both on wavelength and on whether the hail is wet or dry.

Subject Categories:

  • Meteorology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE