It’s cool to be getting a few scans of live Level II dual-pol data from the Charleston radar site tonight, presumably as testing continues on the upgrade. This particular screenshot shows the Correlation Coefficient product, which essentially helps a radar operator identify what’s precipitation and what isn’t. One way meteorologists use the CC product (called RHO in GR2Analyst due to its roots in mathematics) is to help identify possible debris signatures associated with severe storms (including tornadoes) (warning: PDF).
Note to my fellow weather nerds and enthusiasts: While it’s fun to look at, this data needs calibration and won’t be reliable until NWS says it’s live. You also won’t see it in RadarScope or GRLevel3 (2.x) until that time. Stick with Columbia, Wilmington, and the other surrounding radars for now.
For more, take a look at NWS Charleston’s Facebook post earlier Sunday.