U.S. Tornado Risk Map by State
Every state in the U.S. has recorded at least one tornado. What separates them is frequency, intensity, and timing. This interactive map draws on 75 years of NOAA Storm Prediction Center data to give you a historical risk score for all 50 states, normalized by land area so that smaller, tornado-dense states like Oklahoma reflect their true risk rather than being overshadowed by the raw totals of geographically large states.
Click any state to see its Tornado Risk Index score, average annual tornado count, and monthly activity breakdown. The sections below explain how to read that score, which states top and bottom the rankings, and what the numbers mean for where you live.
How to Use This Map
Click any state to see its historical tornado data, monthly activity pattern, and a Tornado Risk Index score from 0 to 10. The map covers all 50 states using NOAA Storm Prediction Center records from 1950 to 2025, normalized by land area so that smaller states with high tornado density show their true risk level rather than being overshadowed by the raw totals of larger states like Texas.
What Is the Tornado Risk Index?
The Tornado Risk Index shown on this map is our own scoring system, distinct from the TORCON Index developed by Weather Channel meteorologist Dr. Greg Forbes.
The TORCON Index is a daily forecast tool that rates the probability of a tornado occurring within 50 miles of a given location on a specific day, based on real-time atmospheric conditions including instability, wind shear, and lift. It is a live forecast product, not a historical measure.
Our Tornado Risk Index works differently. It is a historical frequency measure that answers a different question: based on 75 years of recorded tornado activity, how tornado-prone is this state compared to others, adjusted for its physical size? A state that gets 30 tornadoes per year across 50,000 square miles carries a fundamentally different risk profile than one that gets 30 tornadoes per year across 5,000 square miles.
Both tools are useful for different purposes. The TORCON Index tells you whether to take shelter today. The Tornado Risk Index tells you whether you live in a region where that question comes up often.
The SPC Tornado Risk Scale: What the Levels Mean
When meteorologists and news outlets refer to “slight risk” or “moderate risk” days for tornadoes, they’re describing categories issued by the NOAA Storm Prediction Center in its daily Convective Outlook. Understanding these categories helps you put any given day’s risk into proper context.
The SPC uses five risk levels for organized severe weather:
Risk categories issued daily by the NOAA Storm Prediction Center. A High (5) designation is issued fewer than a dozen times per decade.
Marginal (1): Isolated severe weather possible. Tornadoes are unlikely but cannot be ruled out. Most storms in this category remain below tornado strength.
Slight (2): Scattered severe storms expected. Tornadoes are possible, typically weak and short-lived. This is the most common elevated risk level issued.
Enhanced (3): Numerous severe storms likely. A few tornadoes are expected, possibly strong ones. This level should prompt active weather monitoring.
Moderate (4): Widespread severe weather with multiple tornadoes likely. Some may be significant. Pay close attention to warnings and have a shelter plan ready.
High (5): Rare designation reserved for days when a major tornado outbreak is likely. A high risk day typically produces long-track, violent tornadoes. These events are uncommon but historically deadly.
The SPC also uses percentage probabilities on its outlook maps to show the chance of a tornado occurring within 25 miles of any given point. These are separate from, but related to, the categorical risk levels above. For the current day’s SPC outlook, visit the NOAA Storm Prediction Center directly.
Which States Have the Highest Tornado Risk?
Oklahoma and Kansas consistently top the historical risk rankings when tornado frequency is normalized by land area. Oklahoma averages over 60 confirmed tornadoes per year across a relatively compact state, producing the highest density of tornado activity anywhere in the world. The broader Tornado Alley region, including Nebraska, Iowa, Texas, South Dakota, and Colorado, makes up the core of the highest-risk zone.
The Deep South states of Alabama, Mississippi, Arkansas, Tennessee, and Louisiana present a different kind of risk. While their raw tornado counts are lower than the Great Plains states, their tornadoes tend to occur at night and during winter months when warning times are shorter and residents are less likely to be monitoring conditions. Deep South outbreak events frequently produce multiple strong tornadoes with minimal lead time.
Florida ranks surprisingly high due to the volume of weak waterspout tornadoes that make landfall along its coasts. These are generally less destructive than the supercell tornadoes typical of Tornado Alley, but they inflate Florida’s raw count considerably.
Highest-risk states by normalized tornado density:
| State | Avg. Annual Tornadoes | Relative Risk |
|---|---|---|
| Oklahoma | ~68 | Highest in U.S. |
| Kansas | ~96 | Extremely high |
| Florida | ~60 | High (mostly weak) |
| Nebraska | ~57 | High |
| Iowa | ~47 | High |
| Mississippi | ~44 | High, nighttime risk |
| Indiana | ~22 | Moderate-high |
| Alabama | ~47 | Moderate-high |
| Arkansas | ~39 | Moderate-high |
| Louisiana | ~27 | Moderate |
Which States Have the Lowest Tornado Risk?
If you’re looking for the safest states from a tornado standpoint, the answer generally points west of the Rockies and into the far north. These states have geographic, topographic, or atmospheric conditions that make tornado formation rare.
Alaska records tornadoes so infrequently that individual events make statewide news. The atmospheric dynamics that fuel tornadoes, namely warm, humid surface air colliding with dry, cold upper-level air, are almost never in place simultaneously in Alaska.
Hawaii has documented a handful of weak tornadoes over the past 75 years, typically spawned by tropical systems. The risk is negligible for most residents.
Oregon and Washington are shielded by the Cascade Range. The marine air dominating the Pacific Northwest lacks the instability and Gulf moisture that supercells require. Tornadoes occur here, but they are weak and rare.
California has a coastline that seems like tornado country but isn’t. The cool, stable marine layer that dominates much of the state suppresses the atmospheric instability needed for tornado formation. Southern California sees an occasional weak tornado, but the risk is among the lowest of the contiguous states.
Nevada, Utah, and Montana record some of the lowest tornado counts in the lower 48. Their high elevation, dry air, and distance from Gulf moisture sources make sustained severe thunderstorm development uncommon.
What Are the Odds of a Tornado in My Area?
This is the question most people really want answered, and the honest answer is that it depends on three things: where you live, what time of year it is, and the atmospheric setup on any given day.
On a geographic basis, your long-term probability of experiencing a tornado is far higher in central Oklahoma than it is in coastal Maine. Over a 75-year period, parts of Oklahoma have recorded tornado tracks within a few miles of the same locations multiple times. In contrast, much of New England might go decades between nearby tornado events.
On a seasonal basis, the probability shifts significantly depending on your state’s peak season. For the Great Plains, risk concentrates in April through June. For the Deep South, winter months from November through February carry a higher relative risk than most residents expect. The monthly breakdown in the map tool shows this for each state.
On a daily basis, the SPC’s Convective Outlook is your best resource. A day with no organized severe weather pattern carries a baseline probability measured in fractions of a percent for most locations. A High risk day for your area pushes that probability into territory where shelter planning should be immediate.
The long-term statistical risk of a tornado striking any specific property is low even in Tornado Alley. The operational risk, meaning the probability that you’ll experience a tornado-producing environment that requires a response, is considerably higher for residents of the core high-risk states.
How Tornado Risk Varies by Season
The monthly activity chart in the map shows peak tornado season for each state. Nationally, tornado activity peaks between March and June with a secondary peak in October and November across the southern states.
Average annual tornado count by month, U.S. national total (1991–2020). Source: NOAA Storm Prediction Center.
Monthly average tornado count — U.S. national total
The classic Tornado Alley spring season runs from late April through early June, when Gulf moisture, dry air from the Rockies, and strong jet stream winds combine to create the atmospheric instability that fuels supercell thunderstorms. May is statistically the most active tornado month in the United States, and some of the deadliest outbreaks in U.S. history have occurred in the final two weeks of that month.
Peak tornado months by region:
- Southern Plains (OK, KS, TX): April through June
- Northern Plains (NE, SD, IA): May through July
- Deep South (AL, MS, AR, TN): March through May, secondary peak November through January
- Southeast (GA, FL, SC): March through May, with Florida active year-round from waterspouts
- Midwest (IN, IL, OH): April through June
- Mid-Atlantic and Northeast: June through August (rare events, typically weak)
Understanding your region’s peak window is the foundation of seasonal preparedness. In high-risk areas, that window should prompt you to revisit your shelter plan, test your weather radio, and stay alert to SPC outlooks.
What to Do With This Information
Knowing your state’s historical risk level is a starting point, not a forecast. Even low-risk states experience tornadoes, and any thunderstorm capable of producing one can do so with limited warning.
Own a NOAA weather radio. As our best weather radio buying guide explains, a dedicated weather radio delivers alerts faster than any smartphone app and keeps working when cell networks are overloaded or power is out.
Monitor local conditions with a personal weather station. A home weather station lets you track real-time barometric pressure at your exact location. Rapid pressure drops are one of the most reliable precursors to severe weather development.
Know your safe room. Every household in a tornado-prone area should have a designated interior room on the lowest floor, away from windows, with basic emergency supplies ready.
Know the difference between a watch and a warning. A tornado watch means atmospheric conditions favor tornado development. A tornado warning means a tornado has been confirmed by a spotter or detected on radar and immediate shelter is required. Our article on tornado watch vs warning covers this in more detail.
Frequently Asked Questions
What states are most at risk for tornadoes? Oklahoma, Kansas, Nebraska, and Iowa top the list when tornado frequency is adjusted for land area. Texas leads in raw annual count but its large size lowers its density ranking. Alabama, Mississippi, and Arkansas follow closely, with the added risk of nighttime and winter tornadoes.
What states have the lowest tornado risk? Alaska and Hawaii record the fewest tornadoes of any U.S. states. Among the contiguous 48, Oregon, Washington, Nevada, and Utah have the lowest historical tornado frequency. California also ranks low, though it records more tornadoes than most people expect.
What is Tornado Alley? Tornado Alley is an informal term for the corridor of high tornado frequency across the central U.S. The traditional core includes Texas, Oklahoma, Kansas, Nebraska, South Dakota, and eastern Colorado. Researchers have debated whether the region has been shifting eastward in recent decades, with more activity documented in the Tennessee Valley and Mississippi Delta.
What is the SPC tornado risk scale? The NOAA Storm Prediction Center issues daily Convective Outlooks using five risk categories: Marginal, Slight, Enhanced, Moderate, and High. These reflect the expected coverage and intensity of severe weather, including tornado probability, for a specific area on a specific day.
How do I check today’s tornado risk? Visit the NOAA Storm Prediction Center for the current day’s Convective Outlook, which shows tornado probability as both categorical risk levels and percentage contours by location.
What is the difference between a tornado watch and a tornado warning? A watch means conditions are favorable for tornado development. A warning means a tornado has been spotted or indicated by radar. A warning requires immediate shelter.
How rare is a direct tornado hit on a specific house? The statistical probability of a tornado striking any specific address in a given year is very small even in high-risk areas. What matters more is the probability of being in a tornado-producing environment that requires a response. In central Oklahoma, that situation arises multiple times per year. In coastal California, it may never occur in a lifetime.
About the Data
Tornado records in this map are sourced from the NOAA Storm Prediction Center’s historical severe weather database, which contains confirmed tornado reports from 1950 to 2025. Risk scores are calculated by dividing each state’s total tornado count by its land area in square miles, then normalizing the result to a 0 to 10 scale relative to the highest-density state (Oklahoma).
This is a historical measure only. It reflects past frequency, not a forecast of future activity. For daily severe weather outlooks and official forecasts, visit the NOAA Storm Prediction Center directly.
Reviewed by Ed Oswald
Lead Reviewer, Weather Station Advisor
Ed has covered consumer technology and weather instruments for Digital Trends, PC World, and the New York Times for over 20 years. He has personally tested every station recommended on this page.