Beyond Maximum Hail Size: The Variables that Drive More Accurate Property Claims

June 26, 2026 / 3 min read

Hailstorms are notorious for causing significant, highly localized property damage. Traditionally, insurers have relied on hail data focused solely on maximum hailstone size to gauge a storm’s severity and potential losses. Hail size matters, but Verisk research shows that a more comprehensive approach is essential to understanding storm impacts, reducing uncertainty, and making better claim decisions.

person holding hail

Beyond hail size: unlocking deeper insights

Maximum hail size tells only part of the story. Picture two storms with identical maximum hailstone diameters. One lasts longer, drops harder and faster-falling stones, and delivers far more impact energy. The damage outcomes will look very different.

Hail impact energy fills that gap. It directly estimates the kinetic energy a storm exerts over an area by accounting for the sizes, fall velocity, hardness, and quantity of all hailstones that fall over the storm’s duration, giving you a fuller view of each event.

The key variables that matter

Hail impact energy gets to the point: Damage comes not from the size of a hailstone but from the force it exerts on whatever it strikes. Think of a boxing match. Large hands offer some advantage, but a boxer’s success comes down to how much power is behind each punch and how many punches land. Likewise, to understand where damaging hail has likely fallen, you need to look beyond maximum hail size to every aspect of the storm at a given location:

Storm duration: The longer hail falls, the more chances hailstones have to strike vulnerable surfaces, raising both the likelihood and potential severity of claims.
Hardness of hailstones: Not all hailstones are alike. Softer stones may shatter on impact and cause little or no harm, while harder stones can puncture roofing materials or break windows.
Number of hailstones: Quantity is a major factor in damage. A storm dropping many smaller stones can still cause losses that go overlooked when the focus is on size alone.
Size of hailstones: Maximum size gets all the attention, but knowing the full range of sizes that fell helps determine how likely it is that larger, more damaging stones hit a given area.
Hailstone fall velocity: Speed is the single most important determinant of impact severity, because faster stones carry more destructive potential. Larger, heavier hailstones generally fall faster than smaller ones, though air density and even hailstone shape also affect final velocity.

Reducing uncertainty in property claims

Claim adjusters and insurers struggle to link storm data to property losses quickly and accurately. Enhanced hail variables cut through that uncertainty with a multidimensional view of every storm, helping you:

Better estimate the likelihood and severity of property damage
Strengthen claim validation and reduce fraud
Deliver faster, more transparent settlements to policyholders

A more complete picture for insurers and policyholders

Richer hail data moves you past the limits of traditional metrics toward a more accurate, science-based understanding of storm impacts. At Verisk, we’re committed to equipping the property claims industry with advanced analytics that drive smarter decisions and benefit insurers and their customers alike.

As weather events grow more frequent and more severe, detailed hail variables aren’t just helpful; they’re essential. The future of property claims depends on storm analysis that leaves no hailstone unturned.

See the data behind the storm

Want to see how exposure is reshaping roof risk across the country? Our latest report, The State of America’s Roofs: Risk, Resilience, and Rising Costs, breaks down 2025 hail activity, claims trends, and the regional patterns driving loss costs—giving you the full picture behind the variables discussed here.

Read The State of America’s Roofs.

Learn how Verisk Weather Solutions can improve your storm analysis, claims outcomes, and strengthen your decisions with advanced weather intelligence.

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