* IMPACTS: Low humidities, unseasonably warm temperatures, and strong gusty winds will create erratic fire behavior and rapid spread for new or existing fires.
* AFFECTED AREA: In North Central WY Fire Zones...274...284. In South Central MT Fire Zones...123...124...126.
* COUNTIES AFFECTED: In Central MT...Wheatland. In North Central WY...Big Horn...Johnson...Sheridan...Washakie. In South Central MT...Carbon...Park...Stillwater...Sweet Grass. In Southwest MT...Gallatin.
* WIND: Southwest 15 to 30 mph with gusts up to 45 mph.
* HUMIDITY: As low as 7 percent.
* TEMPERATURES: 84 to 90 degrees, warmest over Zone WY274.
* ADDITIONAL DETAILS: The worst conditions are expected across the lower to middle elevations in fine fuels. The strongest winds are expected in mountain locations and the foothills west of Billings. Zone WY274 will see lower wind gusts of 15 to 25 mph.