Three Layers, Three Different Questions
"Where's the hail data" sounds like one question, but roofing sales teams are usually really asking three separate things: did a storm happen here, did it actually damage roofs, and where exactly should a crew go right now. No single source answers all three well, which is why the companies that target storm markets efficiently tend to stack more than one data source instead of picking a favorite.
Confusing these layers is an expensive mistake. Treating a raw storm report as proof of damage sends crews to knock on doors that never needed a roof. Treating a county-level damage estimate as a routing tool wastes the morning driving between addresses that were never actually in the swath. Each layer below does one job well.
NOAA's Storm Events Database: Free, Public, and Where to Start
The National Oceanic and Atmospheric Administration's Storm Events Database is the foundational layer: a free, publicly searchable record of reported storm events, including hail, with location, date, and reported hail size. NOAA recorded 5,432 hail events in 2025, up from 5,373 in 2024, with Texas and Kansas leading the country in event count.
What NOAA's database does not tell you is which specific roofs got damaged badly enough to justify a claim. It tells you a hailstorm was reported in a given area on a given day. That's the right first filter for deciding whether a state or metro deserves attention at all, and the wrong tool for deciding which specific street to canvass this afternoon.
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Book a Roofing CallVerisk's Roof-Impact Data: Closer to 'Which Roofs Actually Got Hit'
Verisk's 2025 US Roof Report, reported through Insurance Business Magazine, works at a level closer to the sales question that actually matters: not "did a storm pass through," but "how many roofs here show real damage." Sixteen states had at least 20% of their roofs impacted by severe hail in 2025, up from twelve states in 2024. Kansas led the country outright, with 51.8% of its roofs hail impacted that year and a long-term average annual hail loss of $2.2 billion.
This is aerial-imagery-based, property-level scoring, a meaningfully different data product than a storm report. It's the layer that turns "a storm happened in this state" into "this state is worth building a program around," and it's the layer behind the state-level rankings later in this guide's companion, the Hail Alley market map.
Real-Time Swath Feeds: The Software Layer Behind Same-Day Canvassing
Neither NOAA's database nor Verisk's annual report is built to tell a canvassing manager which block to hit at 8am the morning after a storm. That job belongs to canvassing software: platforms like SPOTIO, SalesRabbit, and Knockbase pull in real-time hail-tracking feeds, commonly branded HailTrace, and turn them into routable maps so reps can be dispatched to the actual damage path within hours of a storm hitting.
This is the operational layer, not the strategic one. It answers "where do I send a crew right now" for a storm that already happened this week, using data that's current to the hour rather than the year. A canvassing manager without this layer is working from yesterday's map on today's storm.
Stacking the Three Layers Into One Targeting Workflow
The three layers work best in sequence, not in isolation. Use NOAA and Verisk together to decide, on a yearly or seasonal basis, which states and metros justify a standing storm-sales program at all. That's the strategic decision covered in the Hail Alley market map guide. Once a storm hits inside one of those markets, switch to a real-time swath feed to make the tactical, same-day call on exactly which streets to knock, covered step by step in the post-storm 72-hour plan.
Skipping the first layer means chasing every storm anywhere. Skipping the second means knocking doors a mile outside the actual damage path. Skipping the third means showing up two days after the fastest competitor already signed the street.
What this means for you
- NOAA's Storm Events Database is free and public, and it answers whether a hailstorm happened, not whether it caused real roof damage.
- Verisk's property-level roof-impact data, reported via Insurance Business Magazine, is the closer proxy for real damage: 16 states cleared 20% roof impact in 2025, led by Kansas at 51.8%.
- Real-time swath feeds, often branded HailTrace and built into canvassing software like SPOTIO, SalesRabbit, and Knockbase, are the operational layer for same-day routing after a storm.
- Use NOAA and Verisk to pick the market. Use a real-time swath feed to pick the street.
Sources
The external data in this guide draws on the sources below. Figures described in the text as estimates or industry triangulations are directional and are not attributed to a single dataset.
- NOAA, Storm Events Database
- Insurance Business Magazine, Verisk 2025 roof report
- Knockbase, how roofers use door-to-door software after a storm
- Roofing Software Guide, best roofing canvassing apps