Editorial Type:
Article
Article Type:
Research Article

An Operational Method for the Determination of Vertical Velocities

C. M. Penner Meteorological Service of Canada

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Print Publication:
01 Apr 1963
DOI:
https://doi.org/10.1175/1520-0450(1963)002<0235:AOMFTD>2.0.CO;2
Page(s):
235–241
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Abstract

An ω-chart is obtained from a combination of charts of the thickness advection and the vorticity advection. The advection charts can be rapidly computed by measurement of the areas of the quadrilaterals formed by the cross-patterns of 1000-mb contours and 1000–500 mb thicknesses, and space mean (Z) contours and Z−Z isolines. These charts are themselves of considerable use in short-range forecasting techniques. A simple graphical combination of these charts results in an ω-chart. The ω-values, so derived, have been successfully used in quantitative precipitation computations.

Abstract

An ω-chart is obtained from a combination of charts of the thickness advection and the vorticity advection. The advection charts can be rapidly computed by measurement of the areas of the quadrilaterals formed by the cross-patterns of 1000-mb contours and 1000–500 mb thicknesses, and space mean (Z) contours and Z−Z isolines. These charts are themselves of considerable use in short-range forecasting techniques. A simple graphical combination of these charts results in an ω-chart. The ω-values, so derived, have been successfully used in quantitative precipitation computations.

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Cover Journal of Applied Meteorology and Climatology
Journal of Applied Meteorology and Climatology