tornadoesmap

TORNADOES MAP · REFERENCE

Tornado Season, Tornado Alley & U.S. Geography

Explore when and where U.S. tornadoes occur, what Tornado Alley means, and NOAA archive charts with historical reporting limitations.

By Tornadoes Map · Content reviewed · Independent interpretation of NOAA sources

U.S. tornado activity varies by region and time of year. The historical archive helps explore those patterns, provided its changing reporting coverage stays part of the interpretation.

Where do tornadoes occur most?

The central United States has a broad concentration of tornado activity, but the Southeast and Midwest also experience tornadoes. A state's raw total depends partly on its size and the years and rating groups counted. It does not give an individual's probability of being struck.

Ten largest touchdown-state counts in this selection; unadjusted for land area or reporting differences.
Touchdown stateRecords
Texas9,610
Kansas4,582
Oklahoma4,484
Florida3,761
Nebraska3,203
Illinois3,108
Iowa3,079
Mississippi2,854
Alabama2,681
Missouri2,656

This table is our calculation from 73,458 single-track records, 1950–2025. Each track is assigned to its touchdown state once, including interstate tracks. Counts are not normalized by area, population, or detection changes. Explore state and year summaries.

When is tornado season?

Tornadoes can happen in any month. The Gulf Coast's seasonal peak is earlier in spring; the southern Plains commonly peak in May and early June, and the northern Plains and upper Midwest in June or July. These broad patterns come from NOAA NSSL's tornado basics, not a forecast for any particular year.

U.S. tornado records by month · 1950–2025
  1. January1,956
  2. February2,112
  3. March5,272
  4. April10,650
  5. May16,070
  6. June13,298
  7. July7,456
  8. August5,142
  9. September3,657
  10. October2,969
  11. November2,807
  12. December2,069

Recorded tornadoes by archive month. Counts include records with missing coordinates or ratings. Source: NOAA SPC single-track archive.

The chart pools all archive years. A month with many records may include major outbreaks; it is not a count of tornado days. Regional timing can be obscured by a national total. Compare Oklahoma, Texas, and Alabama for different distributions.

What is Tornado Alley?

“Tornado Alley” is an informal name for an area of frequent tornadoes, not a fixed official boundary. Maps differ depending on the period, area, and tornado categories they measure. NSSL explains that activity shifts from the Southeast in cooler months toward the Plains and farther north in warmer months. Tornadoes also occur outside the area people call Tornado Alley. Read NSSL's geography explanation.

Are tornadoes becoming more common?

Raw report totals cannot answer that question by themselves. Changes in population, spotting, radar coverage, and surveys affect which tornadoes enter the archive. Earlier records miss more weak events. NOAA's Tornado FAQ discusses these reporting limitations.

Even restricting a comparison to higher ratings does not eliminate classification and survey differences. Our figures describe this archive; they do not isolate a climate-change effect or establish the cause of a regional pattern.

How to compare places and years

Use the same years, rating selection, and geographic definition. Keep original F and EF labels visible, inspect unusually busy dates, and distinguish whole tracks from state segments. A comparison of damages also needs separate consideration of exposure and loss reporting: dollar loss and tornado intensity are different measures.

Source for the tables and chart: NOAA SPC single-track CSV. Sources and methodology describes the release and calculations.