What is a heat dome? - WNEM TV 5

What is a heat dome?

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The National Weather Service has classified the hot temperatures across the country as a heat dome, holding them in place for a few days.

As we move into Friday, and even Thursday night, we are expecting heat index values approaching 100 degrees.

We won't get as hot as the central United States has been, however, it is certainly possible that we will approach the 100 degree mark - possibly even exceed it as we go throughout Friday.

What exactly is the heat index?

It is a measure of how hot it really feels when relative humidity is factored in with the temperature. Think of this like the wind chill in the winter. It is what the air actually feels like outside and what you are actually feeling on your body.

What causes high heat index ratings?

It's called a heat dome.

You may have heard that term once or twice over the last week or so and it's really just a large area of high pressure that extends from the surface to the highest parts of the atmosphere.

The heat dome acts like a pressure cooker. Air will start to rise and as it rises it gets sent down by that high pressure. It warms even further and it is giving us all those hot temperatures at the surface. 

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