Radar can spot a town's shredded remains mid-air
Forecasters can now identify floating pieces of family homes and shattered trees drifting miles above the ground, confirming a disaster is happening before a single witness calls it in.
When a massive tornado strikes, it does more than just move air; it grinds infrastructure into a slurry of wood, metal, and glass. Modern dual-polarization radar can now distinguish these jagged bits of civilization from ordinary raindrops. While rain is relatively uniform and spherical, debris is chaotic and mismatched in shape. This creates a distinct visual artifact known as a debris signature, which appears on a meteorologist's screen as a sudden drop in the correlation coefficient—a statistical measure that essentially flags when the objects in the sky no longer look like they belong together.