Imagine a bathtub draining. All the water molecules feel a downward pull to the center of Earth’s mass. The tub floor is tapered slightly, causing the water molecules to flow in one direction. There are about a dozen holes in the drain cover, where the downward pull is exponentially greater.

All the molecules in the tub gather here, eventually passing the cover. The convenient shape to balance these known forces is a vortex.

Zip, off you go.

Out on the Great Plains, East of the Rockies, hundreds of miles of cooler drier moves down from the North.

Warm, moist air rolls up from the South and East, mostly from the Gulf of Mexico.

These differing air masses have different densities, temperatures, and directions of motion. Warm air holds more moisture, and rises. Cool air is harder to lift. Breezes kick up. Clouds heap on the horizon.

Huge complexes called supercells form. These cloud-machines can rise up to 50,000 feet, seeming to collect all the smaller storms around. They have a center called a mesocyclone which rotates. They have a gust front ahead, and downdrafts behind.

On the gust front, perhaps something like our water in the bathtub, rising air is being fed into the supercell quickly enough; the air molecules forced upward intensely enough, that vortices form (the pressure releasing against gravity).

A lot of the power of this cloud machine becomes concentrated. Cyclonic ropes and columns spin down from cooler parts of the storm. These anti-cyclonic (our hemisphere) ropes and columns of rising air stack up in one area.

Zip…off you go.

If you’re anywhere near a tornado you’d hear a guttural roar of wind. It’s described as a loud, terrifying sound you haven’t quite heard before.

Your ears would pop. You’d be pelted with rain or hail, then pierced with dirt, mud, rocks, splinters of wood and bits of tree bark. Aluminum siding might fly by, or structural materials and other larger objects might slam into you. If you found yourself inside, you’d be desperately gathering your loved ones in the safest place possible.

You’d be hoping whoever built this building built it well.

You’d be hoping wherever this tornado moves, it’s away from here.

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This monster just passed through Greenfield, Iowa. The people there could use some help. Sometimes help is for the right reasons, and pretty easy.