Hail maps for roofers: where hail fell and how big it was

A hail map shades the ground under a storm by the largest hail it likely produced, usually in bands such as 1 inch, 1.5 inches and 2 inches. There are two kinds of source data: radar estimates, which cover every square mile the radar network sees, and ground reports (storm spotters, the public), which are precise but only exist where someone measured and reported hail. Radar maps show the full swath; ground reports confirm sizes at points.

1. Spot storms that dropped roof-damaging hail (about 1 inch and up for asphalt shingles; see what size hail damages a roof).
2. Pick the neighborhoods inside the swath, prioritizing the largest hail bands.
3. Filter those homes by roof age, roof permit history and owner occupancy.
4. Canvass, mail and inspect, documenting damage with photos.

Hail Pro does all four on one map. See storm roofing leads and the canvassing app.

• Each colored band is a range of radar-estimated maximum hail size, in quarter-inch steps from 1 inch.
• A storm day runs from 12:00 UTC to 12:00 UTC (early morning Central time), so an evening storm stays on one date.
• Recent storms appear while they are happening and are finalized after the storm day ends.
• Tap any property for its storm history, roof permits and owner.

The free plan includes historical hail (older than two years) on the map. Recent storms on the parcel map, hail alerts and hail filters are part of Pro ($20 per month or $200 per year). See pricing.