58 articles
Hail & Severe Weather
How Can You Estimate Hail Size on Radar?
Learn to read MESH and dual-polarization radar signals while accounting for ground reports, storm motion, and uncertainty.
Hail & Severe Weather
Does Purple on Radar Mean Hail?
Learn what purple usually represents on reflectivity maps and which radar clues strengthen—or weaken—the case for hail.
Hail & Severe Weather
What Is the Largest Hailstone Ever Recorded?
Compare the world weight record with U.S. diameter and circumference records, including how each measurement was verified.
Hail & Severe Weather
What Is Gorilla Hail?
Learn what “gorilla hail” means, how unusually large stones form, and why radar, ground reports, and damage are different evidence.
Hail & Severe Weather
What Conditions Are Needed for Hail to Form?
See how deep moist convection, a strong updraft, supercooled water, and an ice embryo work together—and why surface hail can melt.
Hail & Severe Weather
What Color Does the Sky Turn Before Hail?
Learn why some hailstorms look green, why many do not, and what sky color can—and cannot—reveal about hail at the ground.
Hail & Severe Weather
Is Hail Made of Frozen Rain?
See how thunderstorm updrafts, ice embryos, supercooled droplets, and melting distinguish hail from frozen raindrops.
Hail & Severe Weather
Is Hail Getting Bigger?
Explore how region, season, size threshold, and measurement method shape research on changing hail size.
Hail & Severe Weather
How Is Hail Reported?
Hail reports identify what was observed, where and when it occurred, the largest stone measured, and any known damage.
