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The Self-Taught Meteorologist's Guide to Not Dying in Tornado Season

You have the radar app. You have no idea what it means. A 4-layer guide from survival basics to reading radar like a meteorologist, built by a self-taught Oklahoman who learned the hard way.

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A cow stares down a radar vortex, Steadman ink splatter style

On May 20, 2013, an EF5 tornado tore through Moore, Oklahoma. I was in Norman. My wife was in OKC. I spent the next day doing search and rescue.

Before that, I was like most Oklahomans. I had the radar app. It was right there between Instagram and the banking app I never use. Every spring I’d open it, watch the green and red blobs crawl across the screen, and think, “That looks bad, probably.”

This is not a plan.

After Moore, “that looks bad, probably” stopped being good enough. I decided to learn what I was actually looking at.

I’m not a meteorologist. I’m a guy who got obsessed with radar because the alternative was being helpless while the sky tried to kill my family. Everything here is self-taught, verified against actual science, and field-tested through a decade of Oklahoma springs. Think of this as the cliff notes for reading weather like the pros do.

A disclaimer before we start: I am not a meteorologist, a doctor, or a lawyer. Nothing in this guide is professional advice. Severe weather is genuinely dangerous. Always defer to official NWS warnings and your local emergency management. Use what you learn here to be more informed, not to replace the professionals who do this for a living. Sources are cited throughout. Verify everything.

We’re going in four layers, split across three posts. This one covers survival and reading radar. Part 2 covers forecasting and going full weather nerd. Part 3 is your toolkit: who to follow, what to download, and the Oklahoma station culture sidebar you didn’t know you needed.

Here’s the full stack at a glance. We’ll explain every piece.

LayerWhat You LearnKey Tools
0: Not DieShelter, sirens, when to panicWeather radio (~$35), Storm Shield app
1: Know DangerReading radar like it means somethingRadarScope or RadarOmega ($10/yr), WeatherWise (free)
2: ChaseForecasting why storms formRadarScope Pro ($50/yr), Windy, SPC Mesoanalysis
3: Full NerdSkew-T soundings, CAPE values, predicting tornadoesSupercell Wx (free, Mac/Win/Linux), AllisonHouse

Layer 0: How to Not Die

This is the layer you don’t skip. I don’t care if you read nothing else.

Watch vs. Warning. A watch means conditions are right for tornadoes. A warning means one has been spotted or detected on radar (NWS). Watch = look up from your phone occasionally. Warning = get to shelter now. If you only remember one thing from this entire post, it’s this.

Where to shelter. Interior room, lowest floor, away from windows. A closet, a bathroom, under a stairwell. Put as many walls between you and the outside as you can (NWS Tornado Safety). If you have a storm shelter, get in it. This is not complicated. You will hear your neighbor open his garage to go watch. Ignore him for now. You can join him later as you level up.

The overpass myth. Do not hide under an overpass. I know the famous video. The people in that video got lucky. An overpass elevates you off the ground and into the strongest winds of the tornado’s vortex. At ground level, you’re actually in the weakest winds. Under a bridge, you’re climbing into stronger winds, losing any ground-level protection, and exposing yourself to flying debris that gets channeled through the structure (NWS Overpass Danger). The National Weather Service has been begging people to stop doing this for 25 years. People keep doing it anyway. Don’t be people.

Sirens. The outdoor warning sirens mean “go inside and get more information.” They do not mean “go outside and look.” (That’s what your neighbor is for.) They do not mean a tornado is directly overhead. They mean conditions in your area are dangerous enough that the city decided to wake everyone up. Get inside, get your phone or radio, figure out what’s happening.

Get a weather radio. This is non-negotiable. A Midland WR400 costs about $35 and it will scream at you at 3 AM when a tornado warning is issued for your county. Yes, it looks like something from a RadioShack that no longer exists. Buy it anyway. In Woodward, Oklahoma in 2012, an EF-3 tornado hit just after midnight. Lightning had knocked out all 20 of the city’s outdoor sirens. Six people died. An 87-year-old woman named Wilma Nelson survived because her NOAA weather radio woke her up and she got into a closet before the roof blew off her house (MPR News). Your phone is great until the cell tower a mile away is inside a tornado. A weather radio with S.A.M.E. programming (set it to your county) is a dedicated alarm system that does not depend on your WiFi. Buy one. Plug it in next to your bed. When it goes off, you will briefly believe you are dying. That’s how you know it’s working.

Storm Shield app. Free. GPS-based severe weather alerts. Often faster than the WEA buzzes on your phone. Download it, forget about it, let it do its job.

Test your plan every year. Before tornado season starts, do a dry run with your household. Where’s the shelter spot? Where are the shoes you’re going to put on at 2 AM? (Tornadoes love to hit at night. Debris loves bare feet.) Does the weather radio still have batteries? Do your kids know what to do if they’re home alone? Run this drill every March. It takes ten minutes and it’s the cheapest insurance you’ll ever buy.

When to actually worry. Here’s the honest truth: most tornado warnings do not produce tornadoes. Most tornadoes that do touch down are weak and short-lived. The ones that level neighborhoods are rare. But rare is not never, and Oklahoma is where rare happens. Take every warning seriously until you have the skills to evaluate it yourself. That’s what the next three layers are for.

Layer 1: How to Know Danger

Welcome to the layer where you stop being a spectator. Your neighbor is still out in the driveway with a beer. You’re going to be out there too eventually, but you’re going to know what you’re looking at.

Get a real radar app. Most weather apps show you a smoothed, simplified version of radar data. Pretty colors, not much information. You need an app that shows you the same raw data meteorologists at the National Weather Service see. You have three good options:

  • RadarScope ($10/yr) — The established gold standard. AMS award-winning. Most tutorials and educational videos reference it. If you want to learn alongside YouTube videos, start here.
  • RadarOmega ($9 one-time + subscription tiers) — The newer alternative many active chasers are switching to. Its killer feature is MRMS (Multi-Radar Multi-Sensor) data, which composites data from all nearby radars into a seamless picture. No gaps, no cone-of-silence problems. Also includes satellite, model data, and lightning in one app. The downside: it’s more complex, can lag during active severe weather, and it’s less beginner-friendly than RadarScope (Stormtrack discussion).
  • WeatherWise (free) — The new kid. Free and ad-free with super-resolution radar, storm-relative velocity, and even a Spotter Network layer. If you’re not ready to spend money, start here. It launched around 2024 and chasers are comparing it favorably to the paid options.

We’ll use RadarScope terminology in this guide because most educational content references it, but the concepts apply to all three.

What reflectivity actually means. When you open a radar app, the default view is reflectivity. This is what most people think of as “the radar.” It measures how much energy the radar beam bounces back from stuff in the atmosphere. Rain, hail, bugs, bats, wind turbines (NWS Radar FAQ). The colors map to a scale measured in dBZ (decibels of Z, where Z is the reflectivity factor). You don’t need to know the math. You need to know the colors.

Here’s your cheat sheet:

  • Green (20-35 dBZ): Light to moderate rain. You’re fine.

  • Yellow (35-45 dBZ): Heavy rain. Maybe some small hail.

  • Orange (45-55 dBZ): Very heavy rain, hail likely. Pay attention.

  • Red (55-65 dBZ): Severe. Large hail probable. This is a serious storm.

  • Purple/white (65+ dBZ): Extreme. Large hail likely, severe storm. But reflectivity alone can’t tell you hail size. That takes dual-pol radar (covered in Part 2). High dBZ can also just mean very heavy rain with moderate hail. Don’t panic at colors alone. Use it as a signal to check other products.

  • How to read weather radar reflectivity products (Tornado Titans, 7 min) — Walks through exactly what these colors mean with real examples.

Hook echoes. This is the signature everyone knows but most people can’t actually identify on live radar. When a supercell thunderstorm develops strong rotation, the rain wraps around the updraft area and creates a hook-shaped appendage on the southern (or southeastern) side of the storm. On reflectivity, it looks like the storm grew a tail that’s curling inward. When you see a hook echo, that storm is rotating, and rotating storms are the ones that produce tornadoes (NWS Hook Echo). Not every hook produces a tornado. But every tornado comes from a storm that looks like this on radar.

Storm-relative velocity. This is where you graduate from “I can see a storm” to “I can see what a storm is doing.”

Here’s literally what to look for on your screen: open your radar app, switch to the storm-relative velocity product (SRM). Most of the screen will be one color. Look for a small area where bright green and bright red are right next to each other, almost touching. That’s rotation.

The technical version: velocity mode shows you wind moving toward and away from the radar. Green means moving toward the radar, red means moving away. When you see green and red tightly paired, that’s a couplet. A couplet means rotation. The tighter and brighter the couplet, the stronger the rotation. This is how the National Weather Service detects tornadoes before anyone on the ground can see them (RadarScope Velocity Guide). Learn to read velocity and you’ll know a storm is rotating before the warning is issued.

Important: use storm-relative velocity, not base velocity. This trips up every beginner. Base velocity shows raw wind motion relative to the radar, so the entire screen looks green on one side and red on the other. That’s not rotation. That’s just the storm moving. Storm-relative velocity (SRM) subtracts the storm’s motion, which makes the actual rotation signatures pop. In RadarScope, switch to the SRM product. In RadarOmega and WeatherWise, look for the storm-relative option. If the whole screen is one color on each side, you’re in the wrong mode.

One limitation to know: beam height. Radar doesn’t scan at ground level. The beam travels upward as it gets farther from the radar site. At 60 miles out, the lowest beam is scanning above 3,000 feet (NWS Radar Beam Heights). That means a tornado could be on the ground and the radar might not see the low-level rotation clearly if the storm is far from the radar. Small, brief tornadoes might only be detectable within 30 miles. This is why storm spotters and chaser reports still matter. Radar is powerful, but it has blind spots at distance.

What a wall cloud looks like. At some point you’re going to graduate to the driveway with your neighbor. When you look at a severe thunderstorm, the wall cloud is a lowering that hangs beneath the rain-free base of the storm. It’s the area of strongest updraft. It often rotates visibly. If you see a wall cloud with visible rotation, that storm is doing exactly what radar says it’s doing. This is the visual confirmation of what velocity data shows you. Not every wall cloud produces a tornado, but this is where they come from.

Polygon warnings. The NWS stopped issuing county-wide warnings years ago. Now they issue polygon warnings, irregular shapes that cover the specific area the storm threatens. In your radar app, you can see these polygons overlaid on the radar. If the polygon is over your location, take action. If it’s 30 miles away, keep watching. County-wide warnings used to cry wolf for a lot of people who were nowhere near the storm. Polygons fixed that. Trust them.

Your Layer 1 bookmarks:

  • NWS Norman — Your local forecast office. Read everything they post during severe weather.
  • Oklahoma Mesonet — 120+ weather stations across Oklahoma reporting every 5 minutes. Temperature, dewpoint, wind. The ground truth under the radar.

You now know more about reading radar than 90% of the people arguing about it on Facebook. Your neighbor is impressed. He doesn’t understand velocity couplets yet, but he respects the commitment.

Next up: Part 2 — From Radar Reader to Storm Predictor. You’ll learn how meteorologists know there’s going to be a tornado six hours before it forms. It’s not magic. It’s a chart called a Skew-T, and you can read one by dinner tonight.