During MRMS training, Les Lemon recommended, based on some published research and his personal experience, that a useful MRMS product would be 60+ dbZ reflectivity mapped to the -20 deg C level.  Les uses this to predict when a storm will begin producing not severe hail, but significant severe hail (2 inch plus diameter).  So we haven’t looked at any data yet, archived or otherwise, but we already have a suggestion for improvement!

Patrick Burke (EWP Weekly Coordinator, 18-22 May 2009)