The Southwestern U.S. is preparing for another week of scorching temperatures, with an excessive heat warning extended through the weekend for Arizona's most populated area, as well as parts of Nevada and New Mexico. The Phoenix area is on track to tie or break a record set in 1974 for the most consecutive days with temperatures above 110 degrees Fahrenheit. The high temperatures are even affecting the mornings, with historic records being tied. Federal agents along the U.S.-Mexico border reported that extreme heat over the weekend led to 45 people needing rescue and 10 fatalities.|||||Phoenix's heat wave marches on Rain or not, the Valley's persistent extreme heat shows no signs of cooling off. Monday marked the 11th day in a row with temperatures at or above 110 degrees at Phoenix Sky Harbor Airport. The record for 110-degree days in Phoenix is 18, set in 1974. High temperatures are expected to continue to rise, reaching 117 degrees over the weekend. Arizona's monsoon season officially started on June 15, but there has been no significant rainfall in the Phoenix area since March 22. Experts say extreme heat can have a significant impact on both the mind and body, leading to heat-related illnesses such as heat exhaustion and heat stroke. It is important to stay hydrated, seek shade, and take frequent breaks in cool places to avoid these health risks.