Phoenix weather: Big cool down headed for the Valley

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By Christina O'Haver By Christina O'Haver

PHOENIX -- After a weekend of triple-digit heat in the Valley of the Sun, Mother Nature will bring relief midweek in the form of highs in the 70s and 80s.

A ridge of high pressure is tracking east out of Arizona. This feature is what helped temperatures soar into the first 100-degree readings of the year in Phoenix. Behind it, a storm system out of the Pacific Northwest is headed west in our direction.

Winds will kick up ahead of this system Monday and Tuesday. The strongest winds will be across northern and southeastern Arizona where Red Flag Warnings and Fire Weather Watches are in place. Gusts of 40 to 50 mph combined with relative humidity down to as low as five percent will increase fire danger in these regions.

Blowing dust may also be an problem around susceptible areas during this time frame. In the Valley, expect sustained winds peaking around 15 to 25 mph with gusts of up to 30 mph by Tuesday.

Cooler air will also be ushered in with this storm system. Highs on Monday in the Phoenix-metro will top out around 97 degrees, with a high of 85 Tuesday and trailing down to 79 on Wednesday.

The 90s will return to the forecast by the end of the week and into the weekend as the storm system heads east out of the area.

What this storm will not bring to the Valley is rain, but central and eastern Arizona may see isolated showers and thunderstorms Wednesday. Snow or graupel may also fall down to 6,500 feet, but no accumulations are expected below 8,000 feet.