Storm chances throughout the majority of the week will be confined to the AZ High terrain. High temperatures will be about 4 to 7 degrees above normal through the first half of the week, resulting in widespread Moderate to areas of Major HeatRisk. However, as high pressure restrengthens over the Desert Southwest by the latter half of the week, temperatures will heat up to near record levels, resulting in widespread Major to Extreme HeatRisk.
The hot temperatures will be fairly stable during the first part of the week with localized areas remaining under a Major HeatRisk. Lower desert high temperatures will reach 108-115 degrees, while lows will be in the upper 80s to middle 90s. An Extreme Heat Warning is in effect for all of the lower deserts through this evening. The Extreme Heat Warning was extended for the Phoenix Metro, Lower CO River Valley, and Imperial Valley through Wednesday. Even hotter temperatures are forecast for late this week and through the weekend with widespread Major to Extreme HeatRisk likely developing.
Areas of Major HeatRisk will persist for at least the Phoenix metro, Yuma, and El Centro through midweek before becoming widespread with areas of Extreme HeatRisk developing by Friday. The peak of this heatwave is likely to be Friday and Saturday with lower desert highs reaching 115-119°F. Little relief is expected at night with overnight lows mainly in the upper 80s and lower 90s to as high as the mid 90s by the weekend.
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