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Dangerous temperatures will continue through Monday across the Mojave Desert. Hotter than normal temperatures will continue through next week.
Convective activity will be limited to northwestern Arizona through next week.
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Revised in 3 passages since the 3:42 PM discussion. See every revision.
Discussion
High pressure maintains anomalously hot temperatures across the southwestern United States through early next week. Temperatures will be 5 to 10 degrees above normal for late July through Monday, with daytime highs in the 110s and overnight lows in the upper 80s to low 90s across most desert valleys. Numerous daily record high temperatures and warm low temperature records are in jeopardy - see the CLIMATE section below for details. Hot daytime temperatures and warm overnight temperatures that offer little relief yield large swaths of Major (Level 3 of 4) to Extreme (Level 4 of 4) Heat Risk in the Mojave Desert. Temperatures back off a few degrees on Tuesday and Wednesday as the ridge shifts east and heights aloft fall. However, particularly dangerous heat returns Thursday through next weekend as the ridge builds back to the west. Expect widespread Major to Extreme HeatRisk across southern Nevada, southeastern California, and northwestern Arizona as this occurs.
Building high pressure over the southwestern United States and low pressure over the Pacific Northwest will lead to dry southwesterly flow over the forecast area. This pattern combined with a lack of a lifting mechanism besides daytime heating will inhibit convection for most locations through next week. Northwestern Arizona may still be able to tap into southerly moisture flow and there are low (10 to 20 percent) chances of afternoon thunderstorms over high terrain, especially on Tuesday and Wednesday.
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