U.S. Storm Data by State

Hail and wind statistics for all 50 U.S. states, updated daily, with free CSV/JSON downloads.

Cities hit this week

City pages with a storm report or station gust at the screening thresholds (hail 0.75 in.+, wind 45 mph+) within 25 miles in the last 7 days, freshest first.

Storm data for all 50 states

Each state page with its 12-month event total, NWS warnings included — the same number the state page shows.

What each state page shows

Each state page covers the last 12 months of wind, hail, tornado and flood activity from NWS warnings, Local Storm Reports, official NCEI records and FEMA disaster declarations, plus NOAA storm records by year back to 2010. Every state page shows:

A machine-readable index of every published file — all 50 state and 578 city datasets — is the dataset catalog: https://www.stormauditor.com/downloads/storm-data/catalog.json.

Why duplicate records are merged

The same report often reaches StormAuditor through more than one public feed. Copies of one record are merged so it counts once. Event totals then count one event per place per day for each type: a weather station or storm-report point once a day at its highest reading, NWS warnings once per county per day. Event counts measure how busy a state was, not how many storms hit. The method is documented on Methodology and Data Sources.

Go deeper

How these numbers are counted

The hub, the state pages and the city pages share one set of definitions:

  • Cities hit: A city is listed when at least one report within 25 miles of it showed hail 0.75 in. or larger or wind of 45 mph or more during the period in the list heading: the last 7 days, or the last 30 when the week was quiet (StormAuditor screening thresholds). Reports are NWS storm reports from spotters, the public and officials, plus weather-station gusts, which count from 50 mph. A warning on its own never puts a city on the list. The date shown is the first row of that city's storm-day table.
  • Events (12-month counts): Each state total counts that state's storm log: NWS warnings and Special Weather Statements, storm reports (wind 50 mph+, hail 0.75 in.+), station gusts, NCEI entries and FEMA declarations. One event is one place on one day, counted separately for each type. A weather station or storm-report point counts once a day, at that day's highest reading, however many readings it filed; a place with hail and wind on the same day is two events. NWS warnings and Special Weather Statements count once per county per day. A storm report that relays an airport weather station's reading (the same station, the same gust and the same time) counts once, as the station reading. The same report arriving through another feed (SPC or NCEI) is one record. It is the same number the state page shows. Events measure how busy a state was, not whether a storm hit.
  • Storm-date pages (NWS severe): A storm-date page is published only when at least one report or station gust within 25 miles of a city met the National Weather Service severe criteria (hail 1.00 in. or larger, or wind 58 mph or more), at least two separate observations were logged, and the day ranks among the most significant. A storm report that relays an airport weather station's reading (the same station, the same gust and the same time) counts once, as the station reading. Not every storm day gets a page; when one does, the page and the storm-day table show the same largest hail and strongest gust.
  • NOAA history (since 2010): The official NOAA storm record (NCEI Storm Events) for each state and city from January 1, 2010 to the day before the 12-month window starts: hail 0.50 in.+, thunderstorm wind 40 mph+ and tornadoes. It is a separate, older record with its own "storm days" (days with any entry), so its counts are not compared with the 12-month numbers.

Full method: Methodology and Data Sources.