National Weather Service

The advisory covers most of Natrona County and is in effect from 3 a.m. to 6 p.m. Thursday.

Roads could become slick, particularly US 20-26 west of Casper, I-25 north to Smokey Gap and Casper Mountain Road.

Gusty winds could bring down tree branches in some areas.

Interstate 25 south from the Johnson County Line to Twenty Mile Hill is expected to see accumulating snow.

For the latest road conditions in Wyoming and closure information, visit WyoRoad.info, call 511 or download the Wyoming 511 app.

Snow may return to the area Sunday.

The winter storm will continue to heavily impact western Wyoming.

The National Weather Service advisory is in effect until 2 p.m.

The area including Clark, Cody, Greybull, Powell, Worland and Thermopolis could get four to six inches of new snow.

Wednesday's forecast calls for wind chill values as low as -20F, with winds gusting up to 40 mph.

Parts of Wyoming are virtually shut down as a winter storm moves through.

Al roads in and out of Muddy Gap were shut down as well, also with no estimated reopening time.