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Dual polarization radar sends pulses in both horizontal and vertical directions, giving information about the shape and orientation of objects in the air. This extra information lets meteorologists tell what the hydrometeors are made of and how they’re behaving. Rain drops are generally small and more spherical, while hailstones are larger and more irregular, so their horizontal-versus-vertical return patterns differ noticeably. This capability also helps identify non-meteorological targets, like debris, because debris often produces distinct polarization signatures or reduced similarity between the horizontal and vertical returns. So, this technology not only helps distinguish rain from hail but also detects airborne debris, which is exactly what makes it a powerful improvement over single-polarization radar. Doppler measurements can give wind speed, but dual polarization adds the critical ability to identify the type of precipitation and debris, beyond just motion.