Doppler radar observations : weather radar, wind profiler, by Joan Bech; Jorge Luis Chau

By Joan Bech; Jorge Luis Chau

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Fig. 15. Probability of detection, false alarms and lead time in tornado warnings issued by the National Weather Service as function of year. (Figure courtesy Don Burgess). Doppler velocities are potent indicators of diverging (converging) flows such as observed in strong outflows from collapsing storms. 4). Vertical profiles of reflectivity and Doppler velocity in Fig. 16 indicate a pulsing microburst; the intense reflectivity core (red below 5 kft) near ground is the first precipitation shaft and the elongated portion above is the following shaft.

The forecasting and the warning of severe weather are very briefly described. Then, the underlying technique for the identification of severe thunderstorms using radar is presented. This forms the basis for the radar algorithms that identify the severe storm features. The basic components of the system are then described. Some details and unique innovations are incorporated in the global survey of operational or near operational use. This is concluded by a summary. 2. Forecasting/Nowcasting/Severe weather warnings Severe weather predictions are divided into severe weather watches and severe weather warnings.

Vol. 19, pp. 1759-1771. Brown, R. , B. A. Flickinger, E. Forren, D. M. Schultz, D. Sirmans, P. L. Spencer, V. T. Wood, & C. L. Ziegler (2005). Improved detection of severe storms using experimental fine-resolution WSR-88D measurements. Weather and Forecasting, Vol. 20, 3-14. Burgess, D. , V. T. Wood, & R. A. Brown (1982). Mesocyclone evolution statistics, Severe Storm Conf. , pp. 422-424, AMS, Boston, MA, USA. N. (2009). Automated volume scan evaluation and termination (AVSET). 34th Conference on Radar Meteorology, AMS, Williamsburg, VA, USA.

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