Ciclone Extratropical
In short
A new extratropical cyclone is expected to form near the coast of Brazil between tonight and early Friday morning, bringing heavy rain and cold air to the South and Southeast regions.
In plain words
It is a large weather system that forms outside the tropics. It creates low pressure, which brings strong winds, storms, and sudden drops in temperature.
A simple example
A storm system moving off the Atlantic coast could cause hail and heavy downpours in coastal cities over the coming weekend.
Why it matters
These systems can cause flash flooding and dangerous winds. They are also responsible for significant shifts in seasonal weather patterns.
Easy to mix up
Do not confuse it with a tropical cyclone, such as a hurricane, which forms in warmer waters and has a different structure.