The National Weather Service in Riverton has issued a Red Flag Warning for the Wind River Basin today from 2:00 p.m. through 9:00 p.m. this evening. A Red Flag Warning means that critical fire weather conditions are either occurring now or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. A cold front will move across Wyoming this afternoon and evening. A combination of hot temperatures, low relative humidity, gusty winds, a wind shift, lightning and a haines index of six will likely bring critical fire conditions to some portions of western and central Wyoming. We'll see southwest* winds* becoming west to northwest 15-25 mph with gusts of up to 25-35 mph today. The strongest winds are expected after the cold frontal passage. Gusty erratic winds of 35-55 mph are possible in stronger showers or thunderstorms. Isolated thunderstorms are expected after 3:00 p.m. with the potential for dry lighting. There is a *Haines Index of 6*. The Haines Index can range between 2 and 6. The drier and more unstable the lower atmosphere is, the higher the index. An index of 6 indicates there is a "high potential." Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. View the full forecast for the Wind River Basin here.