FAQ
Questions, answered.
Short, honest answers about storm reports and how we use them.
Where does the data come from?
The NOAA Storm Prediction Center: the official Storm Data database for 2010 through 2025, and SPC's daily storm reports since then. Both are public government data. See data sources.
Does a hail report mean my roof was damaged?
No. A report means someone, such as a trained spotter, emergency manager or the public, measured or saw hail of that size at that spot. Hail varies a lot over short distances. Only an inspection can tell you about damage.
No reports near me. Did hail miss my house?
Not necessarily. Storm reports are points where someone reported hail; storms between towns or at night often go unreported. Treat no reports as unknown, not as no hail.
What size hail damages roofs?
Hail about 1 inch (quarter size) and larger is considered severe and can damage roofs, siding and cars, depending on the roof material, its age and wind. See the hail size chart.
How current is it?
Every morning we load the Storm Prediction Center's reports from the previous day. Recent reports are preliminary and can change; Storm Data is final after NOAA's review, usually months later.
Why are the times in CST?
NOAA's Storm Data uses Central Standard Time for every report, all year. We do the same so dates match the official record.
Can I use this for an insurance claim?
It can help you find the dates of storms near a property. Insurers and adjusters make their own decisions and may use other weather data; this isn't a certified weather report.
Is it free?
Address history and the last 7 days of storms are free with no account. Pro adds 120 days of storm dates with full ZIP lists, service-area alerts, CSV downloads and printable reports.
Is Aeonis affiliated with NOAA?
No. We use public NOAA data but aren't affiliated with or endorsed by NOAA or the National Weather Service.