where is the heat dome coming from

The heat dome is usually coming from a stubborn high-pressure system that parks over a region and traps hot air underneath it like a lid on a pot. In the recent Europe event, reports say the pattern is being driven by a dip in the jet stream and a ridge of high pressure, with extra warming from Saharan air adding to the heat.

What it means

A heat dome forms when sinking air compresses and warms, while the high- pressure pattern blocks cooler air from moving in. That’s why temperatures can stay unusually high for days or even weeks.

Where the air comes from

The heat itself is not from one single “source.” It often comes from a mix of:

• Heat already in the local air mass.
• Warm air transported from nearby hot regions, such as the Sahara in parts of Europe.

• A stalled jet stream that keeps the same hot pattern in place.

Why it keeps happening

Heat domes are becoming more noticeable because the atmosphere is warmer overall, which makes extreme heat easier to build and harder to break. Climate change does not directly create every heat dome, but it can make them more intense and longer-lasting.

In one line

So, the heat dome is “coming from” a trapped high-pressure pattern in the atmosphere, often helped by a stalled jet stream and sometimes fed by already hot air from nearby regions.