ZDR & RHOHV: Dual-Pol Products in RainViewer | RainViewer Blog

In our continuing series on PRO Radar products in RainViewer , we’re exploring the tools that elevate storm tracking from basic observation to advanced weather analysis. Today’s spotlight is on two dual-polarization radar products: Differential Reflectivity (ZDR) and Correlation Coefficient (RHOHV) . These tools reveal the internal structure of storms, offering insights into what’s falling from the sky, how it’s forming, and what might come next. For weather enthusiasts looking to sharpen their radar-reading skills, ZDR and RHOHV are powerful pieces of the puzzle. Together, they help distinguish raindrops from hailstones, snow from sleet, and even meteorological echoes from biological clutter like birds or insects. Let’s dive in.