Western Ridge Triggers Dual Southwest Heatwave Extending Into August as SoCal Remains Humid from Warm Seas

A strong western Pacific ridge, intensified by a developing strong El Niño and amplified by Hurricane Genevieve, is setting up a double-peaked heatwave across the Southwest into August. Unusually warm near‑shore ocean temperatures are keeping coastal SoCal humid and muggy, while record‑high 500 mb geopotential heights boost inland heat and could push Death Valley toward extreme temperatures. Nights may stay warm (often above 70–75F), increasing health risks and wildfire risk as fuels dry, with monsoon moisture possible only in brief, limited bursts and the pattern likely persisting into autumn.