Similar-sounding, very different creatures. Different sizes, different winds, different seasons, different killers.
A hurricane is a weather system — a giant, self-organizing atmospheric engine that can be seen from space. A tornado is a feature inside a thunderstorm — a small, tightly wound vortex that fits inside a football field.
If you overlaid a Category 5 hurricane on a map of the Midwest, it would blanket 4-5 states. If you overlaid an EF5 tornado on the same map, you'd need a magnifying glass to see it. That doesn't mean the tornado is weaker at its center — tornadoes have the highest wind speeds ever measured on Earth (301 mph in 1999) — but it does mean the damage is concentrated in a narrow path.
Hurricanes form over warm tropical ocean water. The warm sea surface evaporates moisture into the atmosphere, and as the storm's low-pressure center draws that moist air upward, latent heat released during condensation drives the whole system. Take the warm water away — for example, by moving over land — and a hurricane starves to death within hours.
Tornadoes are children of the supercell thunderstorm. They form when strong wind shear tilts a thunderstorm's updraft and stretches a mid-level rotating column of air toward the ground. The energy source is instability in the atmosphere (CAPE) rather than sea-surface temperature. Tornadoes happen exclusively over land in the vast majority of cases — or briefly over water as waterspouts.
Historically, hurricanes have killed more Americans than tornadoes in single events. The 1900 Galveston hurricane killed about 8,000. Katrina killed 1,833. On the tornado side, the 1925 Tri-State Tornado killed 695, and the 2011 Joplin EF5 killed 158.
Adjusted for the number of events per year, tornadoes are actually more frequent killers. The US averages 60-70 tornado deaths per year, versus about 40 hurricane deaths per year on average. But single-event lethality favors hurricanes because they affect so much more area.
Hurricanes kill mostly with water. Storm surge — the piling up of seawater by the wind — is the deadliest hurricane hazard by a huge margin. Katrina's storm surge topped 25 feet in some places. Hurricane Ian (2022) killed most of its victims through surge and inland flooding, not wind. Rainfall from stationary hurricanes like Harvey (2017) can also kill by flash flooding hundreds of miles inland.
Tornadoes kill mostly with debris. Direct wind can throw people from their homes, but most tornado fatalities are from being struck by flying debris — 2x4s, sheet metal, entire vehicles. The high wind speeds convert modest objects into missiles. Mobile home residents face by far the highest per-capita fatality rate.
Hurricanes give days. The National Hurricane Center issues 5-day track and intensity forecasts, and specific coastal warnings usually go up 36-48 hours before landfall. Evacuations are ordered days in advance. There's no reason to be surprised by a hurricane at your door if you have TV or a phone.
Tornadoes give minutes. The average warning lead time is about 13 minutes, and about 30 percent of tornadoes give zero warning. Nighttime tornadoes are especially dangerous because most people are asleep. A NOAA weather radio is the reliable way to be woken up.
Hurricane season in the Atlantic runs June 1 to November 30, with peak activity in September. In the eastern Pacific it runs mid-May through November.
Tornado season peaks in April, May and June across the US, but tornadoes happen every month. Dixie Alley has secondary peaks in November-December.
Landfalling hurricanes routinely produce tornado outbreaks in their outer rain bands. Hurricane Ivan (2004) spawned 118 tornadoes across the Southeast after landfall. Katrina (2005) produced 60+. These tornadoes tend to be small and short-lived (usually EF0-EF2) but they can catch residents off guard when the region is already focused on wind and flooding.
Which is scarier? Both. Hurricanes are worse if you can't evacuate. Tornadoes are worse if you can't hear the warning. Prepare for whichever your region gets, invest in the right shelter, and don't rely on general intuition — tornadoes are locally more violent, hurricanes are cumulatively more destructive.