Isobar

those squiggly lines on the news are readable.

a TV weather map you push around: drag the high or the low, the isobars redraw, and the wind runs fastest where the lines crowd

Each line joins places with the same air pressure. Air is pushed from high to low, so where the lines crowd together the push is steepest and the wind is strongest; far apart, it is calm. The Earth's spin turns that wind until it runs along the lines: anticlockwise round a low and clockwise round a high, north of the equator.

Concepts: fluid-flow, pattern.

An interactive you play with one thumb, on Wundr.