The National Weather Service has issued red flag warnings about fire dangers from southwestern to northeastern Wyoming until 7 p.m. today, according to its Riverton office.

"A gusty southwesterly breeze will combine with low relative humidity, unseasonably warm temperatures and critical fuels to bring critical fire conditions this afternoon," according to the weather service announcement at 12:10 p.m.

Affected counties include northern Sweetwater, southern Fremont, Natrona, Johnson, Campbell, and lower elevations in Crook and Weston, according to the NWS.

Rapid fire growth conditions are being generated by southerly winds of 10 to 15 mph with gusts up to 30 mph, relative humidity as low as 13 percent, temperatures reaching from the high 80s to the lower 90s.

"A red flag warning means that critical fire 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," according to the NWS.