The National Weather Service in Riverton has issued a Red Flag Warning, which is in effect from noon today to 8 PM MDT this evening. * AFFECTED AREA: In Central WY Fire Zone. .289. In Southwest WY Fire Zone. .279. * COUNTIES AFFECTED: In Central WY. Fremont. Natrona. In Southwest WY. Sweetwater. * IMPACTS: Low humidities, strong gusty winds, and dry thunderstorms with gusty and erratic outflow winds could cause erratic fire behavior. * WIND: Southwest 15 to 25 mph with gusts up to 40 mph. * THUNDERSTORMS: Isolated thunderstorms will produce lightning and strong outflows, which could cause erratic fire behavior. Gusts up to around 50 mph are possible with storms. * HUMIDITY: As low as 17 percent, with isolated areas as low as 12 percent.