Humidity, dew points, fires and rain

Humidity, dew points, fires and rain

The moon is almost the color of a grapefruit in the sky. Smoke from the wildfires in the West has spread clear across the country, all the way to the East coast, and making the midwestern skies hazy.

Hazy days of summer, the dog days are here, and more heat and humidity on the way. It’s not the heat, it’s the humidity, people used to say.

Meteorologists prefer to use the term dew points as a more accurate way to measure the moisture content in the atmosphere.

What is the difference between dew point and humidity?

Here is how the National Weather Service defines it—Dew Point vs Humidity

In simpler terms, the dew point is a measure of humidity. The dew point is the temperature at which water vapor condenses into liquid water. The higher the dew point, the higher level of moisture at a given temperature. The dew point of humid air will be higher than the dew point of dry air.

What is the warmest day Chicago has ever had?

Here is meteorologist Tom Skilling’s answer–What is the warmest day Chicago has ever had? | WGN-TV

Did you know that volcanoes and wildfires can make their own weather? You can read more about fire clouds here.

Fires and rain. And after the rain, mosquitoes!


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  • Thank you! That's the best explanation I've seen yet about dew points. I'm just trying to keep from feeling like I can't find fresh air... so far, I'm OK at it.

  • In reply to Margaret H. Laing:

    Thanks for reading! Fortunately, no air quality alerts for Chicago area, so far. New York City did issue an advisory for people with respiratory problems.

  • In reply to Weather Girl:

    That's good. I'm not crazy about the qualities of hot, humid air anyway, so I'm glad that the haze isn't making it worse.

  • In reply to Margaret H. Laing:

    Take care in the heat, my friend! Thanks again.

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