A strong high pressure system will shift back over the Desert Southwest early this week leading to hotter temperatures and overall fairly dry conditions. This system is expected to persist over the region all week, with at most day-to-day high terrain monsoon activity across eastern Arizona. Starting Monday, temperatures will rise to around 5-7°F above average as Major HeatRisk developing across the lower deserts. An Extreme Heat Warning is in effect for the lower deserts of AZ and southeast CA for Monday through Friday.
For the first half of this week, storm chances will be limited to the AZ high terrain and southeast AZ, however distant outflow boundaries may reach the lower deserts resulting in areas of blowing dust. Storm chances will expand area-wide by Thursday and Friday. Temperatures will remain well above normal through the entire week resulting in a Major HeatRisk
Temperatures will rise to above normal starting Monday with daily highs across the lower deserts between 109-113°F Monday-Friday. Overnight lows will also warm well into the 80s to as warm as the lower 90s in central Phoenix. Areas of Major HeatRisk also return by Monday and forecast to last through the entire work week. Extreme Heat Warnings are in effect for much of the area Monday-Friday.
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