Effects of miso- and mesoscale obstructions on PAM winds obtained during project NIMROD ( Chicago).

Abstract

27 (PAM) stations were operated between 19 May and 1 July 1978 during the operational phase of Project NIMROD (N Illinois Meteorological Research On Downburst), collecting approx. 1 000 000 records of wind data. Analysis revealed that the PAM-measured winds are influenced by the mesoscale obstruction of the Chicago metropolitan area as a whole, as well as the misoscale obstructions of individual trees and buildings identifiable in panoramic pictures taken at each PAM site where data were being collected. -from Authors