Phoenix weather: Excessive heat hits Valley

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By Catherine Holland By Catherine Holland

PHOENIX -- After a warm start to the week, temperatures are set to soar even more over the next couple of days. 

Tuesday brought a high of 110 degrees under mostly sunny skies. 

Storms developed in Pinal County, pushing dust into the Valley during the early evening hours. At one point, the storm was about 60 miles wide and 2,000 feet high, bringing visibility down to a quarter of a mile on Interstate 10 between Phoenix and Tucson. The storm lost speed and strength when it moved into the Valley, but brought areas of blowing dust to town during the evening commute. 

Southern Arizona has seen several consecutive days of scattered thunderstorms, but that should be changing during the second half of this week. 

The high-pressure ridge centered to our east is retrograding back west. As it sits directly over Arizona, we'll see a drier flow of air into the state, which will limit storms, and also slightly higher temperatures. 

Look for a high today of 110 degrees in the Valley, warming to about 112 by Friday and through the weekend.  Overnight lows will only dip to the 80s. 

There is an Excessive Heat Warning in effect from 10 a.m. Wednesday until 8 p.m. Friday. 

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