Historic event
Udall tornado May 25, 1955
At 10:35 PM on May 25, 1955, an F5 tornado destroyed Udall, Kansas while the town slept. 80 people died — the deadliest tornado in Kansas history. There was no warning.
The overview
- Date: May 25, 1955, about 10:35 PM.
- Location: Udall, Kansas — Cowley County, 25 miles southeast of Wichita.
- Rating: F5 (retroactively applied).
- Deaths: 80 — more than half from a town of about 600.
- Injuries: 270+.
- Nearly every building in town was destroyed or damaged.
- Part of the same outbreak that hit Blackwell, Oklahoma (F5, 20 dead) an hour earlier.
The night it happened
The tornado struck with no warning system in place — outdoor sirens for weather were not yet standard, weather radar was primitive, and the town was asleep.
- The storm had already produced the Blackwell, OK F5 an hour before.
- Survivors described being awakened by the roar seconds before impact.
- The town water tower crashed down; brick buildings collapsed.
- Rescue was hampered by darkness, rain, and blocked roads.
- Neighboring communities sent every ambulance and hearse they had.
The aftermath
- Udall rebuilt, but the population never fully recovered.
- The disaster became a case study in the need for tornado warning infrastructure.
- Within years, civil defense sirens were repurposed for tornado warnings across Kansas.
- A memorial in Udall lists the names of all 80 victims.
- The event is taught in Kansas schools as the state's worst natural disaster.
The meteorology
- A cyclic supercell moving northeast from Oklahoma produced both the Blackwell and Udall F5s.
- This storm is one of the earliest well-documented examples of a cyclic F5-producing supercell.
- Rated F5 retroactively when the Fujita scale was applied to historical events.
- The nighttime timing was the primary fatality driver — a pattern that still holds today.
Lessons that still apply
- Nighttime tornadoes kill at 2.5x the daytime rate — Udall is the founding example.
- A weather radio with SAME alerts is the modern answer to the warning gap that doomed Udall.
- Community shelters and basements save lives when warning time is short.
- The 26-minute warning at Greensburg (2007) versus zero at Udall (1955) is the measure of how far warnings have come.