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- W2549794983 abstract "As part of a nowcast development project a new verification scheme has been developed that is designed to be more informative with regard to the nature of errors found in an object-oriented method. This methodology assesses an overall penalty function that is composed of errors due to differences in size, shape, location, intensity and orientation of precipitation objects. The concept behind this approach is to provide detailed error assessments that give forecasters indications of the nature of problems with forecasts that can inform decision making and development. The original version of the verification scheme is described in detail in Micheas et al. (2007). The Procrustes verification technique described originally in Micheas et al. (2007) was slightly modified for use with meteorological precipitation fields. The adjustments made from the original version of the Procrustes scheme are minor and reflect changes in the interpretation of errors only and not with the original methodology. The original penalty took into account only shape and intensity sum of squares errors. The new penalty function is a cell-by-cell-based function which includes shape, intensity, dilation, rotation, and translation, and attempts to bring each error component penalty to similar orders of magnitude. Once penalties for each matched set are compiled a mean squared error is assessed for all matches in a forecast domain. In the current framework if there are more cells in the forecast an additional penalty is assessed for false alarms. The first half of this paper uses some artificial geometrically shaped pseudo-reflectivity images to illustrate the operation of the new version of the verification scheme. The second portion shows the scheme as applied to an ensemble of nowcasts of a single case of severe weather in the St. Louis, MO area." @default.
- W2549794983 created "2016-11-30" @default.
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- W2549794983 date "2007-01-01" @default.
- W2549794983 modified "2023-09-26" @default.
- W2549794983 title "9.3 APPLYING A PROCRUSTES SHAPE ANALYSIS VERIFICATION SCHEME TO NOWCAST ENSEMBLE FORECAST MEMBERS TO DETERMINE ACCURACY OF DIAGNOSED CONVECTIVE MODE" @default.
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