The National Weather Service in Reno has issued a red-flag warning for much of western Nevada due to conditions that will increase the threat of wildfires over the next few days. The warning stretches from the California line to south of Hawthorne and as far north and east as Winnemucca. It includes Reno, Carson City, Fallon, Fernley, Lovelock and much of Mineral and Lyon Counties. The weather service says the combination of low humidity and gusty winds can cause wildfires to grow rapidly in both size and intensity before crews have a chance to respond.