Imagine walking outside and feeling like you stepped into a preheated oven that never turns off. That is the reality facing millions of Americans as a rare weather event takes shape.

WHAT HAPPENED

Two huge areas of high pressure, known as heat domes, are moving toward each other. When they meet next week, they will trap hot air over the Midwest and Northeast.

This "heat engine" will make it hard for the air to cool down, even at night. Weather experts say this could break records that have stood for decades.

Power companies are already getting ready. They expect a huge jump in people using air conditioning, which puts a lot of stress on the wires that bring power to your home.

What the evidence shows

• Two heat domes merging into one giant system.
• Record-breaking heat expected in the Midwest and Northeast.
• Heat index levels reaching dangerous zones for humans.
• Power grids placed on high alert for record demand.
• Higher risks for heatstroke and breathing problems.

THE BIGGER QUESTION

We often talk about heat as a natural event, but we do not always treat it like a crisis. If our power grids and cities are not built for this kind of heat, how many more summers can we handle before the system breaks?

Should we be looking at our power grid as a public safety tool rather than just a utility? This event shows that staying cool is no longer a luxury, but a way to stay alive.

WHAT HAPPENS NOW

Expect higher electric bills and more cooling centers opening in your city. Local leaders will likely ask people to use less power during the hottest parts of the day.

If you have older neighbors or friends without air conditioning, check on them now. This kind of heat is hardest on the elderly and people with lung issues.

WHAT WE STILL DON'T KNOW

1. Exactly which cities will see the highest record temperatures?
2. How long will this merged heat dome stay in one place?
3. Will the power grid hold up without any local blackouts?