Tuesday, 13 August 2002
Improvements to the WSR-88D Storm Cell Identification and Tracking algorithm
Accurate storm identification and tracking are basic and
essential parts of radar and severe weather warning operations in
today's meteorological community. Improvements over the original
WSR-88D storm series algorithm were made with the implementation
of the Storm Cell Identification and Tracking (SCIT) algorithm.
However, the SCIT algorithm has a tendency to fragment
larger-scale storm cells (e.g., supercells) into multiple
algorithm detections. When this happens, storm cell attributes
(e.g., cell-based VIL) are usually inaccurate, and tracking
errors often occur, leading to poor trend plots. In order to
reduce the amount of storm fragmentation, enhancements have been
made to the SCIT algorithm's vertical-association (VA) process.
Test results on a variety of storm types show that the enhanced
SCIT algorithm has fewer VA errors compared to a baseline version of the
algorithm. Results also show a substantial reduction in tracking
errors for the enhanced SCIT versus the baseline algorithm.
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