Dangerous, record-breaking heat is in the forecast through at least the end of next week as high pressure strengthens across the region. Valley highs will hit the first 110 reading of the season this afternoon. Timing on this is pretty typical for a given summer in Metro Phoenix.

What's not typical is how high temperatures will rise after today. In fact, Valley highs will tie or break records each day starting Sunday and continuing through at least next Friday. As these afternoon highs rise, morning lows will follow suit, with temperatures only dropping to the mid 80s and low 90s.

An Excessive Heat Warning is in effect for Metro Phoenix and most of Arizona below 5000 feet starting today and continuing through Friday evening. This heat has the potential to be deadly, so avoid outdoor activities after 9 a.m. and before 8 p.m.

Those who have to work outside should be hydrating, taking frequent breaks in an air-conditioned building and wear light, loose-fitting clothing. Also keep an eye on pets, elderly friends and family members, as well as children, as they are most susceptible to the effects of this heat. Forecast highs for Phoenix will hit 110 today, 114 Sunday, then fluctuate from 117 to 118 for all of next week. Highs in the mountains will range from the upper 80s to the low 100s.

As high pressure moves towards the Four Corners region, moisture will begin to be imported from the south and southeast starting Tuesday. This is some resemblance of our monsoon pattern, so there will be slight chances for thunderstorms in the mountains Tuesday and for the remainder of the week.

While conditions remain relatively dry towards the surface, no substantial wetting rains are expected from these storms. Instead, we'll mainly see gusty winds and lightning, increasing the fire danger. Meanwhile, a High Pollution Advisory for ozone is in effect for Maricopa and Pinal Counties through 9 p.m. Sunday.


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