It was a hazy start to our Wednesday and many are wondering why.
Powerful storms Tuesday night and early Wednesday morning lead to significant cooling and the formation of a strong inversion layer in Phoenix.
Typically, temperatures decrease with height as you go up in the atmosphere. When an inversion forms, you get a layer where the opposite is true. That, essentially, puts a cap on the air closest to the surface trapping pollutants like dust and moisture. We had plenty of both to trap from the overnight storms.
The inversion formed around the 3,000 foot level and was so strong that morning visibility was reduced to 2.5 miles at Phoenix Sky Harbor.
That inversion started to break around lunch time allowing the air to mix and the visibility to improve but the cloud coverage stuck around all day.
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