The U.S. West endured a fourth day of scorching heat on Monday as temperatures again threatened to shatter records, major wildfires burned nearly unchecked in drought-stricken Oregon and power grids strained under the pressure. #Heatwave #News #Reuters Subscribe: http://smarturl.it/reuterssubscribe Reuters brings you the latest business, finance and breaking news video from around the globe. Our reputation for accuracy and impartiality is unparalleled. Get the latest news on: http://reuters.com/ Follow Reuters on Facebook: https://www.facebook.com/Reuters Follow Reuters on Twitter: https://twitter.com/Reuters Follow Reuters on Instagram: https://www.instagram.com/reuters/?hl=en