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A broad banded arrow showing a fast upper-level current.
Also known as: Jet core marking, Upper wind arrow
Jet streams are drawn on upper-air charts as broad arrows, sometimes with nested bands showing the core's speed. They steer surface systems, which is why a chart of winds at nine kilometres tells a forecaster about tomorrow's rain.
Marks a narrow band of fast upper-level wind on a high-level chart, drawn as a broad arrow along the axis.
Contexts: Navigation, Maps
Is analysed because it steers surface weather systems, which is why upper-air charts are used to forecast conditions at the ground.
Contexts: Navigation, Maps
A wide arrow with a long shaft drawn across a chart, sometimes filled with nested bands of different tone.