May 31, 2013, started out like any other high-risk day in the central Oklahoma plains. The air felt heavy, like you were breathing through a wet sponge. Meteorologists were staring at CAPE values that looked more like typos than real data. If you’ve followed storm chasing for more than a minute, you know the name Tim Samaras. He wasn't some adrenaline junkie looking for a YouTube thumbnail. He was the gold standard. He was the guy who founded TWISTEX (Tactical Weather Instrumented Sampling in Tornadoes Experiment) to actually put sensors in the path of these monsters to save lives.
Then came the El Reno tornado.
It’s the storm that changed everything. For years, people have asked what tornado killed TWISTEX, and the answer is a storm so bizarre and violent it literally defied the rules of meteorology as we understood them at the time. It wasn't just a big tornado. It was a 2.6-mile-wide geographic shift that moved with a predatory unpredictability. When the dust settled near the intersection of Reuter Road and Radio Road, the chasing community had lost its most respected voice, his son Paul, and their colleague Carl Young.
The Monster in the Wheat Fields
The El Reno storm didn't start out as a record-breaker. It began as a classic supercell near El Reno, Oklahoma. But as it matured, it did something terrifying. It grew. Fast.
Most people think of tornadoes as these neat, stovepipe-shaped funnels you can easily track. El Reno was different. It was wrapped in heavy rain, making it almost impossible to see the actual circulation from certain angles. It eventually widened to 2.6 miles. To put that in perspective, if you were standing in the middle of it, you couldn't even see the edges. It was a wall of wind that spanned the entire horizon.
TWISTEX was there to do science. Tim Samaras drove a white Chevrolet Cobalt—a choice many questioned later because it wasn't a reinforced "dominator" style vehicle. But Tim didn't plan on getting hit. He was a master of positioning. He’d spent decades dancing on the edge of these things without a scratch. However, the El Reno tornado had a deadly secret: sub-vortices.
Inside the main circulation, smaller, faster "suction vortices" were spinning like tops. While the main tornado was moving at a certain speed, these internal mini-tornadoes were whipping around at over 175 mph. Worse, the tornado did a sudden, sharp "hook" to the north and accelerated from 20 mph to nearly 55 mph in a matter of seconds.
Why TWISTEX Couldn't Escape
You've probably seen the radar loops. It's haunting. One minute the TWISTEX crew is positioned safely to the south and east, and the next, the storm expands and veers directly toward them.
The Cobalt was found a half-mile from the road. It didn't look like a car anymore. It was a compressed ball of metal. National Weather Service investigators and fellow chasers like Reed Timmer and Jeff Piotrowski have since spent hundreds of hours analyzing why such an experienced team got caught.
- Visibility was zero. Because the tornado was "rain-wrapped," the TWISTEX team likely couldn't see the boundary of the actual wind field.
- The road trap. Reuter Road was a dirt path that turned into a muddy nightmare once the rain hit. If you’ve ever driven in Oklahoma red clay after a downpour, you know it’s like driving on grease.
- Rapid Expansion. The storm didn't just move toward them; it grew over them. The wind field expanded so quickly that their "escape route" was swallowed before they could even hit the gas.
It's easy to armchair quarterback this a decade later. But Tim Samaras was cautious. He was the guy who lectured others about safety. His death sent a shockwave through the National Oceanic and Atmospheric Administration (NOAA) and the entire meteorological community. If it could happen to Tim, it could happen to anyone.
The EF-5 Controversy and the Data
There is still a bit of a nerd-war regarding the rating of the tornado that killed the TWISTEX team. Officially, the National Weather Service (NWS) in Norman rated it an EF-3.
Wait. How?
Basically, the Enhanced Fujita scale is based on damage to man-made structures. Since the El Reno tornado mostly chewed up wheat fields and hit very few buildings, the "damage" didn't justify an EF-5 rating. However, mobile Doppler radar (Doppler on Wheels) measured wind speeds of 296 mph (476 km/h) just above the ground. Those are some of the highest wind speeds ever recorded on Earth.
If that storm had hit downtown Oklahoma City instead of open fields, the casualty count would have been in the thousands. For the TWISTEX team, the "rating" didn't matter. They were hit by the physical limit of what the atmosphere can produce.
A Legacy Written in the Wind
Tim Samaras didn't die for a "cool shot." The instruments TWISTEX deployed provided data that helped us understand how the pressure drops at the center of a vortex. Because of their work, lead times for tornado warnings have improved. People get more than just a few minutes now; they get enough time to get underground.
Since 2013, the culture of storm chasing has shifted. You see fewer people trying to get "core-punched" and more emphasis on long-range photography. The tragedy showed that no amount of experience can account for a storm that breaks the rules.
The death of the TWISTEX team remains a somber reminder of the raw power of the plains. It wasn't just a weather event; it was a moment of profound loss for science. Tim, Paul, and Carl weren't just names on a news ticker—they were the people trying to pull the "fingerprints" off the monster so we could finally understand how it breathes.
How to Stay Safe During Severe Weather
If you live in "Tornado Alley" or anywhere prone to these storms, there are real steps you should take that go beyond just "heading to the basement."
Understand the "PDS" Warning If you see a "Particularly Dangerous Situation" tag on a tornado warning, it means the NWS has high confidence in a large, violent storm. This isn't the time to go out on the porch with a camera.
The GPS Trap Never rely solely on a phone's GPS for navigation during a storm. Cell towers are often the first things to go. Have a physical atlas of your county. Know the "grid" of your local roads so you don't end up on a dead-end dirt path like many did during the El Reno event.
Helmet Safety It sounds silly until you need it. Most tornado fatalities are caused by blunt force trauma to the head from flying debris. Keeping a bicycle or batting helmet in your safe room can literally be the difference between life and death.
Layered Communication Don't just rely on an app. Have a NOAA weather radio with fresh batteries. Apps can lag, and seconds matter when a storm is moving at 50 mph.
The best way to honor the legacy of the TWISTEX team is to respect the power of the atmosphere. They died trying to make us safer; the least we can do is pay attention when the sirens start to wail.
Next Steps for Safety and Awareness
- Review your sheltering plan: Ensure everyone in your household knows exactly where to go if a warning is issued, even at night.
- Audit your emergency kit: Check the expiration dates on your water and ensure you have a physical map of your immediate area.
- Follow reputable sources: During high-risk days, stick to local NWS offices and trusted meteorologists rather than unverified "streamers" who may prioritize views over safety.
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