Melting level
Notes:
The poor algorithm performance was likely related to problems with determination of the melting level. The data on this slide shows the algorithm-determined melting level near the radar, at 03z. Clearly, the radar was unable to find a melting layer, yet a melting layer existed, as evidenced by the mixed precipitation over northeast Pennsylvania. The algorithm is supposed to use RAP forecast data in cases where a melting layer cannot be determined, however in this case the RAP was showing a double melting layer, which was not correctly used by the algorithm. This appears to be another example were the melting level and associated precipitation types determined by dual polarization algorithms was quite poor for cases with a "double melting layer", one near the ground and one aloft.
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Slide 19