Becoming milder, then turning noticeably colder again Sunday and Monday Details >
Dec 19, 2013; 5:00 AM ET Snow showers for Edmonton on Friday, meanwhile a heat wave continues in Southwest Australia.
Big changes are on the way for parts of the Western and Central states late this week and into this weekend.
Warm air is forecast to surge into much of the eastern half of the nation by the weekend and will be accompanied by heavy rain and flooding risk in some locations.
Thunderstorms in parts of the South this weekend may become strong enough to threaten lives and property.
A parade of snowstorms has been taking aim at the U.S. recently, increasing the chances for many to see a White Christmas.