Brutal heat maintains grip on the SouthwestCopiedAs a heat dome continues to grip the Southwest this week, the threat of wildfires and heat-related illnesses will increase. "The source of this upcoming heat is a large, sprawling ridge of high pressure positioned over the Southwest. High temperatures are forecast to remain above 100 in El Paso through at least this coming weekend. Residents face risk of heat-related illnesses"Aside from daytime temperatures, heat may stick around at night. "While the Desert Southwest cities are usually quite hot in July, this week will bring heat that is highly anomalous.