A major heatwave will impact the Southwestern U.S. as high pressure builds in with record high temperatures possible midweek into the weekend. On Monday we will see HOTTER afternoon high temperatures reaching 111 degrees in Las Vegas. Neighborhoods in the east valley with be a few degrees higher than that. Winds will start off light, increasing to 10-20 mph breezes in the afternoon. High pressure over the Four Corners & Mexico will expand west, leading to scorching temperatures next week. An EXCESSIVE HEAT WARNING will go into effect all week through Saturday with highs ranging from 108 to 117 degrees across Southern Nevada. We also won’t see much relief overnight from the daytime heat with overnight low temperatures in the upper 80s to low 90s in Las Vegas. Afternoon temps will also be up to 120+ degrees along the Colorado River down to Laughlin and in Death Valley. A HEAT ADVISORY will also go into effect for our local mountains for highs in the upper 80s and lows 90s in the Spring Mountains and Sheep Range. Record-breaking & record-tying temperatures are expected Wednesday through Saturday in Las Vegas where highs will range from 114-116 degrees. The all-time hottest temperature ever recorded in Las Vegas is 117 degrees, and even that record high is in jeopardy with this heat streak. We have hit 117 degrees four times since weather records have been kept (since 1937) and will be close again this week. The National Weather Service is comparing this upcoming heatwave to one that happened in June/July of 2013 where 29 people died, 353 people were injured and brief power outages were reported. It’s important to stay hydrated during this stretch of very hot temperatures — if you’re feeling thirsty, you’re already dehydrated and behind on your water intake. Also, make sure you have good working AC to stay cool.