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MOST ACCURATE FORECAST: Extreme heat, air quality alerts and monsoon storm chances this week

Posted at 5:49 AM, Jul 18, 2022
and last updated 2022-07-19 01:02:19-04

PHOENIX — After powerful storms this weekend, the monsoon storm threat is winding down in the Valley.

There's just a slight chance of a few isolated storms through much of the week.

Up north, scattered storms will continue to develop each day bringing strong winds, lightning and heavy downpours. The risk for flash flooding near our burn scars will continue to be the biggest threat across the high country.

We're also tracking extreme heat.

Excessive Heat Warnings remain in place through Thursday for parts of northwest Arizona including Marble Canyon, Glen Canyon and the lower elevations of the Grand Canyon.

Here in the Valley, daily highs will top out near 111 or 112 degrees through the entire week and we won't get much overnight relief as lows hover in the low 90s early each morning.

So, make sure to stay hydrated and limit your time outside during the heat of the day.

We're also monitoring air quality as ozone pollution reaches unhealthy levels this week. An Ozone High Pollution Advisory is in effect through Tuesday with Ozone High Pollution Watches now for Wednesday, Thursday and Friday.

If you have any respiratory conditions, like asthma or COPD, limit your time outside or you could have difficulty breathing.

By this weekend, high pressure will shift back toward the Four Corners allowing more monsoon moisture to flow in. That will increase storm chances on Saturday, Sunday and Monday.

As storm chances increase, temperatures will drop. Expect Valley highs between 105 and 108 over the weekend.

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2022 Rainfall totals:

Sky Harbor Official Rainfall: 0.91" (-2.46" from average)

Valley Average (Phoenix Rainfall Index): 1.21"

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Daily rainfall reports from all across the Valley can be found here.
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PHOENIX IS GETTING DRIER - LOWER RAINFALL AVERAGES NOW

Average Monsoon Rainfall in Phoenix (1981-2010): 2.71" of rain

NEW Average Monsoon Rainfall in Phoenix (1991-2020): 2.43" of rain

Average Yearly Rainfall in Phoenix (1981-2010): 8:03" of rain

NEW Average Yearly Rainfall in Phoenix (1991-2020): 7.22" of rain
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