Documenting Hail Damage: A Guide for Property Owners

Published 2026-07-15 · Updated 2026-07-15

Understanding how hail damage is documented after a storm is crucial for property owners, contractors, and adjusters. This guide covers the essential steps and data sources used to assess and document hail impact.

How Hail Damage is Documented After a Storm

When severe weather strikes, particularly a hailstorm, documenting potential hail damage accurately is a critical first step for property owners, contractors, and adjusters. This process often combines on-site inspection with robust historical weather data to create a comprehensive picture of the event and its impact. This article will explore the methods and data sources used to document hail damage, highlighting how StormAuditor's detailed storm history reports can support this process.

What Happens After a Hailstorm?

After a hailstorm, the initial focus is often on safety and immediate damage assessment. For property owners, this means checking for obvious signs of damage to roofs, siding, windows, and vehicles. While a visual check is a starting point, professional assessment and thorough documentation are essential for accurate date-of-loss research and future repair planning.

Common Signs of Hail Damage:

  • Roofs: Granule loss on asphalt shingles, dents or cracks on shingles, exposed fiberglass matting, soft spots, and bruising. Asphalt shingles typically begin showing functional hail damage around 1.00"-1.25" impacts. Softer or older shingles may show bruising at smaller sizes. For metal roofs, cosmetic denting can occur at approximately 1.00"+ hail, though functional failure is rare until 1.75"+.
  • Gutters & Downspouts: Dents or dings from hail impacts.
  • Siding: Cracks, chips, or impact marks, especially on softer materials like vinyl or aluminum.
  • Windows & Skylights: Cracks or breakage. Window and skylight breakage becomes common with approximately 1.75"+ hail impacts.
  • Decks & Fences: Splintering or impact marks.

How StormAuditor Measures and Documents Hail Events

StormAuditor specializes in providing precise, property-specific historical hail data, which is invaluable for documenting hail damage. Our methodology, SAHE-2 (Storm Auditor Hail Estimate v2), leverages multiple authoritative sources to provide granular detail about past hail events.

1. MRMS MESH (Maximum Estimated Size of Hail): Our primary data source is radar-derived MESH swaths, available via Hail Explorer. This provides per-pixel estimates of hail size that intersected a specific property, including a 0.25 mile buffer around the address point. These swaths show not only the maximum estimated hail size but also the path and intensity across an area.

2. SPC Storm Reports: We integrate human-observed hail size reports from the Storm Prediction Center (SPC). These ground-truth observations, submitted by trained spotters, law enforcement, and the public, complement radar data and help corroborate estimated hail sizes.

3. NWS Severe Thunderstorm Warnings: We also incorporate data from NOAA/NWS severe thunderstorm warnings. A severe thunderstorm warning indicates that hail of 1.00" (quarter size) or larger OR wind gusts of 58 mph or greater were expected or observed in the polygon. While being within a warning polygon does not mean a property experienced the peak conditions, it indicates the potential for severe weather. Our address lookup tool can show if a property was within a warning polygon.

This multi-source approach allows StormAuditor to provide comprehensive hail reports that can inform date-of-loss research. Our reports indicate not only the maximum estimated hail size at a specific location but also the date and time of the event, which is crucial for linking damage directly to a storm. Keep in mind, StormAuditor provides ESTIMATES, not measurements, and does not offer legal, insurance, or engineering advice.

Practical Guidance for Documenting Hail Damage

For property owners, contractors, and adjusters, effective documentation requires a blend of on-site evidence and reliable historical weather data.

For Property Owners:

  • Safety First: Ensure the storm has passed and it's safe to assess damage.
  • Initial Visual Inspection: Take clear, well-lit photos and videos of any visible damage immediately after the storm. Include wide shots of the property and close-ups of specific damage. Note the date and time.
  • Consult Professionals: Consider contacting a reputable roofing contractor or licensed inspector for a thorough assessment.
  • Gather Data: Use services like StormAuditor's address lookup tool to obtain a historical hail report for your property. This can provide objective data on hail size and storm timing for your date-of-loss research.
  • File Claims Promptly: Contact your insurance provider as soon as you suspect damage.

For Contractors and Adjusters:

  • Detailed Site Inspections: Conduct thorough inspections, documenting all damage with high-resolution photos and detailed notes. Utilize measurement tools for hail sizes and impact spacing.
  • Reference Industry Standards: Be aware of hail impact classes like UL 22118, where Class 4 shingles are the highest tier, designed to withstand impacts from a 2" steel ball.
  • Leverage StormAuditor Data: Integrate StormAuditor's property-specific hail details into your damage assessments. Our methodology page explains how our SAHE-2 estimates are derived from MRMS MESH data and SPC reports. This objective historical data can support your findings.
  • Date-of-Loss Research: Use our date-of-loss-weather-research tools to pinpoint specific storm events and associated weather conditions.

Limitations

While StormAuditor provides robust historical weather data, it's important to acknowledge inherent limitations. Radar-derived MESH data can sometimes under-estimate wet hail or over-estimate in very high reflectivity cores. Tornadoes and severe thunderstorms are highly localized phenomena; warning polygons cover an area and time window, meaning a property inside a polygon was under a WARNING but did not necessarily experience the peak conditions. StormAuditor provides ESTIMATES, not measurements, and we do not offer legal, insurance, or engineering advice. Our data shows what weather occurred, but causation of damage is for qualified inspectors or engineers to determine. For more information, please see our dedicated limitations page.

Related StormAuditor Tools

FAQ

Q: What size hail causes damage to asphalt shingles?

A: Asphalt shingles typically begin showing functional hail damage at around 1.00"-1.25" impacts. Softer or older shingles may show bruising from smaller hail sizes.

Q: How can I tell if my roof has hail damage?

A: Look for granule loss, dents, cracks, or exposed fiberglass matting on asphalt shingles. For metal roofs, look for dents or dings. Professional inspection is recommended for thorough assessment.

Q: Can StormAuditor confirm hail damage at my property?

A: StormAuditor provides property-specific historical hail size estimates and storm event data, which is crucial for date-of-loss research. We show what weather occurred (estimated hail size, wind gusts, warnings) but we do not confirm damage causation, as that requires an on-site inspection by a qualified professional.

Q: What data does StormAuditor use for hail reports?

A: StormAuditor utilizes MRMS MESH (radar-derived Maximum Estimated Size of Hail) data, SPC (Storm Prediction Center) storm reports of observed hail, and NOAA/NWS severe thunderstorm warning polygons.

Q: When should I get a professional inspection after a hailstorm?

A: It's advisable to get a professional inspection by a qualified contractor or inspector soon after a significant hailstorm if you suspect damage, especially if the hail size was reported to be 1.00" (quarter size) or larger in your area.