Tornado Season: When and Where Tornadoes Strike

There is no single national window, and the Storm Prediction Center says so in its own words: "There is a general northward shift in "tornado season" in the U. S. from late winter through mid summer. The peak period for tornadoes in the southern Plains, for example, is during May into early June. On the Gulf Coast, it is earlier during the spring; in the northern Plains and upper Midwest, it is June or July." That northward march is exactly what the 50 state pages here show: Gulf coast windows open in February, the southern Plains peak in May, and the northern Plains and upper Midwest in June and July. The Southeast adds a second, colder peak in November and December that the popular image of tornado season misses entirely.

By tornadoes a year across 1996 to 2025 the leaders are Alabama, Arkansas, Florida, Georgia and the rest of the belt from the Gulf coast to the northern Plains. Read the big numbers knowing what they count: a state total counts a tornado anywhere inside a big state, and weak brief tornadoes dominate the raw counts. Sort by EF2 or stronger per year and the map tightens onto the Plains and the mid South; sort by night share or by deaths and it moves decisively southeast.

It is a nickname, not a place with a boundary, and that is SPC's own position: "Tornado Alley is a nickname in the popular media for a broad swath of relatively high tornado occurrence in the central U. S. Various Tornado Alley maps which you may see can look different because tornado occurrence can be measured many ways--by all tornadoes, tornado county-segments, strong and violent tornadoes only, and databases with different time periods." Its FAQ adds: "Remember, this is only a map of greatest incidence. Violent or killer tornadoes do happen outside this Tornado Alley every year. Tornadoes can occur almost anywhere in the U. S., including west of the Rockies and east of the Appalachians, and even in Canada and overseas." On top of that, research co-authored at NOAA's National Severe Storms Laboratory has documented tornado frequency trending downward in parts of the Plains and upward in the Midwest and Southeast since 1979. This site therefore sorts no state into or out of an alley; it publishes each state's own counts and lets them speak.

Because the SPC database stores tornado tracks as segments: a tornado that crosses a county or state line appears as several rows, and the flags that mark the structure are easy to miss. Counting rows double counts precisely the long track tornadoes people remember, like the 166 mile Western Kentucky tornado of December 2021, which is one tornado and four rows. This site counts each tornado once nationally, once per state it touched at state level, and once per county it touched at county level, and the counting rule is checked against SPC's own de-segmented tornado file every time the snapshot is rebuilt.

The National Weather Service's own words: "Tornado Watch: Be Prepared! Tornadoes are possible in and near the watch area. Review and discuss your emergency plans, take inventory of your supplies and check your safe room. Be ready to act quickly if a warning is issued or you suspect a tornado is approaching. Acting early helps to save lives! Watches are issued by the Storm Prediction Center for counties where tornadoes may occur. The watch area is typically large, covering numerous counties or even states." And: "Tornado Warning: Take Action! A tornado has been sighted or indicated by weather radar. There is imminent danger to life and property. Move to an interior room on the lowest floor of a sturdy building. Avoid windows. If in a mobile home, a vehicle, or outdoors, move to the closest substantial shelter and protect yourself from flying debris." There is also a third, rarer level: "Tornado Emergency: Seek Shelter Immediately! A tornado emergency is the National Weather Service's highest alert level. It is issued when a violent tornado has touched down in the watch area. There is a severe threat to human life and property, with catastrophic damage confirmed."

The Storm Prediction Center's answer, verbatim: "Tornado reports have increased, especially around the installation of the NEXRAD Doppler radar system in the mid 1990s. This doesn't mean that actual tornado occurrence has gone up, however." And the reason: "The increase in tornado numbers is almost entirely in weak (EF0-EF1) events that are being reported far more often today due to a combination of better detection, greater media coverage, aggressive warning verification efforts, storm spotting, storm chasing, more developmental sprawl (damage targets), more people, and better documentation with cameras (including cell phones) than ever." Every number on this site is computed inside the Doppler era, 1996 to 2025, so every count here sits inside the same recording regime.

Because a season has to be earned by the data. A state gets a frequency led page at 10 or more tornado days a year with 2 or more EF2+ tornadoes a year, a window led page at 3 or more tornado days a year, and below that the page counts. Five states (Alaska, Delaware, Hawaii, Rhode Island, Vermont) recorded tornadoes in fewer than 15 of the 30 years, and their pages show the entire record instead of a calendar. The cut lines are this site's, and they are stated on every page they shape.

Tornadoes are a fatal hazard, and that call belongs to the National Weather Service forecast offices and the Storm Prediction Center, the bodies with the mandate, the radar and the surveyors. These pages count 30 years of the agency's own records and show any active watch or warning verbatim with the office that issued it. For everything forward looking, weather.gov and spc.noaa.gov.