Storm chances throughout the majority of the week will mainly be confined to the AZ High terrain. High temperatures will be about 4 to 7 degrees above normal through Wednesday, 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 into this weekend, temperatures will heat up to near record levels, resulting in widespread Major to Extreme HeatRisk.
Extreme Heat Warnings are in effect today and Wednesday for the Phoenix Metro, Lower CO River Valley, and Imperial Valley with highs around or just over 110°F. Even hotter temperatures are forecast for late this week and through the weekend Extreme Heat Warnings in effect Thursday-Sunday areawide. The peak of this heat wave should occur on Friday and Saturday when lower desert highs of 115-120°F are expected.
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 115-120°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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