We've got a heat wave brewing again

How high the index will rise

The Tri-State has already had one heat wave this summer, lasting six days, and now another one is brewing.

But it's not just the heat: it's rising levels of humidity that will take this hot air and add insult to injury.

Here's what you need to know:

How bad will the humidity get this time?

Dew points will rise into the mid-70s with this latest heat wave, so the heaviness to the air will return.

Oppressive humidity returning

Once the dew point nears 75 degrees, it becomes oppressive.

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This type of condition also makes it hard for our sweat to evaporate, which is a natural cooling process. That's why it's so important to get our bodies into the air conditioning, because even overnight weather conditions will be warm.

How high will the heat index get?

The heat index should climb to 95-99 on Thursday and Friday. By the time we get into the weekend, the afternoon heat index will range from 100-105. Add a mostly sunny sky, and it's just going to be sweltering outside.

How long should this last?

We are looking at seven or more days of oppressive heat and humidity. When looking at a few long-range weather models, I'm easily seeing highs above 90 through the Fourth of July.

Heat building across the eastern half of the country

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